SpringBoot_springboot 字符串包含’、”、`、|、&、.、/、\ csdn

@SpringBootApplication
public class HelloworldApplication {
 
    public static void main(String[] args) {
        SpringApplication.run(HelloworldApplication.class, args);
    }
 
}

@Target(ElementType.TYPE)
@Retention(RetentionPolicy.RUNTIME)
@Documented
@Inherited
@SpringBootConfiguration
@EnableAutoConfiguration
@ComponentScan(excludeFilters = { @Filter(type = FilterType.CUSTOM, classes = TypeExcludeFilter.class),
		@Filter(type = FilterType.CUSTOM, classes = AutoConfigurationExcludeFilter.class) })
public @interface SpringBootApplication {
}

package org.springframework.boot;
 
import java.lang.annotation.Documented;
import java.lang.annotation.ElementType;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.annotation.Target;
import org.springframework.context.annotation.Configuration;
import org.springframework.core.annotation.AliasFor;
import org.springframework.stereotype.Indexed;
 
@Target({ElementType.TYPE})
@Retention(RetentionPolicy.RUNTIME)
@Documented
@Configuration
@Indexed
public @interface SpringBootConfiguration {
    @AliasFor(
        annotation = Configuration.class
    )
    boolean proxyBeanMethods() default true;
}

@Target({ElementType.TYPE})
@Retention(RetentionPolicy.RUNTIME)
@Documented
@Component
public @interface Configuration {
    @AliasFor(
        annotation = Component.class
    )
    String value() default "";
 
    boolean proxyBeanMethods() default true;
}

@Target(ElementType.TYPE)
@Retention(RetentionPolicy.RUNTIME)
@Documented
@Inherited
@AutoConfigurationPackage
@Import(AutoConfigurationImportSelector.class)
public @interface EnableAutoConfiguration {
}

@Target(ElementType.TYPE)
@Retention(RetentionPolicy.RUNTIME)
@Documented
@Inherited
@Import(AutoConfigurationPackages.Registrar.class)
public @interface AutoConfigurationPackage {
}

static class Registrar implements ImportBeanDefinitionRegistrar, DeterminableImports {
 
		@Override
		public void registerBeanDefinitions(AnnotationMetadata metadata, BeanDefinitionRegistry registry) {
			register(registry, new PackageImports(metadata).getPackageNames().toArray(new String[0]));
		}
 
		@Override
		public Set<Object> determineImports(AnnotationMetadata metadata) {
			return Collections.singleton(new PackageImports(metadata));
		}
 
	}

PackageImports(AnnotationMetadata metadata) {
        //第一块
			AnnotationAttributes attributes = AnnotationAttributes
					.fromMap(metadata.getAnnotationAttributes(AutoConfigurationPackage.class.getName(), false));
			List<String> packageNames = new ArrayList<>(Arrays.asList(attributes.getStringArray("basePackages")));
			for (Class<?> basePackageClass : attributes.getClassArray("basePackageClasses")) {
				packageNames.add(basePackageClass.getPackage().getName());
			}
			if (packageNames.isEmpty()) {
				packageNames.add(ClassUtils.getPackageName(metadata.getClassName()));
			}
			this.packageNames = Collections.unmodifiableList(packageNames);
		}

public static void register(BeanDefinitionRegistry registry, String... packageNames) {
		if (registry.containsBeanDefinition(BEAN)) {
			BasePackagesBeanDefinition beanDefinition = (BasePackagesBeanDefinition) registry.getBeanDefinition(BEAN);
			beanDefinition.addBasePackages(packageNames);
		}
		else {
			registry.registerBeanDefinition(BEAN, new BasePackagesBeanDefinition(packageNames));
		}
	}

protected List<String> getCandidateConfigurations(AnnotationMetadata metadata, AnnotationAttributes attributes) {
		List<String> configurations = SpringFactoriesLoader.loadFactoryNames(getSpringFactoriesLoaderFactoryClass(),
				getBeanClassLoader());
		Assert.notEmpty(configurations, "No auto configuration classes found in META-INF/spring.factories. If you "
				+ "are using a custom packaging, make sure that file is correct.");
		return configurations;
	}

  public static List<String> loadFactoryNames(Class<?> factoryType, @Nullable ClassLoader classLoader) {
        ClassLoader classLoaderToUse = classLoader;
        if (classLoader == null) {
            classLoaderToUse = SpringFactoriesLoader.class.getClassLoader();
        }
 
        String factoryTypeName = factoryType.getName();
        return (List)loadSpringFactories(classLoaderToUse).getOrDefault(factoryTypeName, Collections.emptyList());
    }

private static Map<String, List<String>> loadSpringFactories(ClassLoader classLoader) {
        Map<String, List<String>> result = (Map)cache.get(classLoader);
        if (result != null) {
            return result;
        } else {
            HashMap result = new HashMap();
 
            try {
                Enumeration urls = classLoader.getResources("META-INF/spring.factories");
 
                while(urls.hasMoreElements()) {
                    URL url = (URL)urls.nextElement();
                    UrlResource resource = new UrlResource(url);
                    Properties properties = PropertiesLoaderUtils.loadProperties(resource);
                    Iterator var6 = properties.entrySet().iterator();
 
                    while(var6.hasNext()) {
                        Entry<?, ?> entry = (Entry)var6.next();
                        String factoryTypeName = ((String)entry.getKey()).trim();
                        String[] factoryImplementationNames = StringUtils.commaDelimitedListToStringArray((String)entry.getValue());
                        String[] var10 = factoryImplementationNames;
                        int var11 = factoryImplementationNames.length;
 
                        for(int var12 = 0; var12 < var11; ++var12) {
                            String factoryImplementationName = var10[var12];
                            ((List)result.computeIfAbsent(factoryTypeName, (key) -> {
                                return new ArrayList();
                            })).add(factoryImplementationName.trim());
                        }
                    }
                }
 
                result.replaceAll((factoryType, implementations) -> {
                    return (List)implementations.stream().distinct().collect(Collectors.collectingAndThen(Collectors.toList(), Collections::unmodifiableList));
                });
                cache.put(classLoader, result);
                return result;
            } catch (IOException var14) {
                throw new IllegalArgumentException("Unable to load factories from location [META-INF/spring.factories]", var14);
            }
        }
    }

 <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-validation</artifactId>
        </dependency>

package com.hua.springboot02.pojo;
 
import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;
import org.springframework.boot.context.properties.ConfigurationProperties;
import org.springframework.stereotype.Component;
import org.springframework.validation.annotation.Validated;
 
import javax.validation.constraints.Email;
import java.util.Date;
import java.util.List;
import java.util.Map;
 
@Component
@Data
@ConfigurationProperties(prefix = "person")
@AllArgsConstructor
@NoArgsConstructor
@Validated
public class Pserson {
 
    @Email(message = "错误啦宝贝!!")
    private String name;
    private int age;
    private Date birth;
    private Dog dog;
    private List<Object> list;
    private Map<Object,Integer>map;
}

@NotNull(message="名字不能为空")
private String userName;
@Max(value=120,message="年龄最大不能查过120")
private int age;
@Email(message="邮箱格式错误")
private String email;
 
空检查
@Null       验证对象是否为null
@NotNull    验证对象是否不为null, 无法查检长度为0的字符串
@NotBlank   检查约束字符串是不是Null还有被Trim的长度是否大于0,只对字符串,且会去掉前后空格.
@NotEmpty   检查约束元素是否为NULL或者是EMPTY.
    
Booelan检查
@AssertTrue     验证 Boolean 对象是否为 true  
@AssertFalse    验证 Boolean 对象是否为 false  
    
长度检查
@Size(min=, max=) 验证对象（Array,Collection,Map,String）长度是否在给定的范围之内  
@Length(min=, max=) string is between min and max included.
 
日期检查
@Past       验证 Date 和 Calendar 对象是否在当前时间之前  
@Future     验证 Date 和 Calendar 对象是否在当前时间之后  
@Pattern    验证 String 对象是否符合正则表达式的规则
 
.......等等
除此以外，我们还可以自定义一些数据校验规则

#SpringBoot的多环境配置，可以选择激活哪一个配置
spring.profiles.active=dev

 server:
    port:8081
  spring:
    profiles:
      active: dev
  ---
server:
  port:8082
spring:
  profiles: dev
---
server:
  port:8082
spring:
  profiles: test

java -jar spring-boot-config.jar --spring.config.location=F:/application.prop

public void addResourceHandlers(ResourceHandlerRegistry registry) {
            if (!this.resourceProperties.isAddMappings()) {
                logger.debug("Default resource handling disabled");
            } else {
                this.addResourceHandler(registry, "/webjars/**", "classpath:/META-INF/resources/webjars/");
                this.addResourceHandler(registry, this.mvcProperties.getStaticPathPattern(), (registration) -> {
                    registration.addResourceLocations(this.resourceProperties.getStaticLocations());
                    if (this.servletContext != null) {
                        ServletContextResource resource = new ServletContextResource(this.servletContext, "/");
                        registration.addResourceLocations(new Resource[]{resource});
                    }
 
                });
            }
        }

<dependency>    
    <groupId>org.webjars</groupId>   
    <artifactId>jquery</artifactId>    
    <version>3.6.0</version> 
</dependency>

"classpath:/META-INF/resources/"
"classpath:/resources/"
"classpath:/static/"
"classpath:/public/"

public static class Resources {
        private static final String[] CLASSPATH_RESOURCE_LOCATIONS = new String[]{"classpath:/META-INF/resources/", "classpath:/resources/", "classpath:/static/", "classpath:/public/"};

private Resource getWelcomePage() {
            String[] var1 = this.resourceProperties.getStaticLocations();
            int var2 = var1.length;
 
            for(int var3 = 0; var3 < var2; ++var3) {
                String location = var1[var3];
                Resource indexHtml = this.getIndexHtml(location);
                if (indexHtml != null) {
                    return indexHtml;
                }
            }
 
            ServletContext servletContext = this.getServletContext();
            if (servletContext != null) {
                return this.getIndexHtml((Resource)(new ServletContextResource(servletContext, "/")));
            } else {
                return null;
            }
        }
 
        private Resource getIndexHtml(String location) {
            return this.getIndexHtml(this.resourceLoader.getResource(location));
        }
 
        private Resource getIndexHtml(Resource location) {
            try {
                Resource resource = location.createRelative("index.html");
                if (resource.exists() && resource.getURL() != null) {
                    return resource;
                }
            } catch (Exception var3) {
            }
 
            return null;
        }

# 关闭默认图标
spring.mvc.favicon.enabled=false

<dependency>
            <groupId>org.thymeleaf</groupId>
            <artifactId>thymeleaf-spring5</artifactId>
        </dependency>
        <dependency>
            <groupId>org.thymeleaf.extras</groupId>
            <artifactId>thymeleaf-extras-java8time</artifactId>
</dependency>

@ConfigurationProperties(
    prefix = "spring.thymeleaf"
)
public class ThymeleafProperties {
    private static final Charset DEFAULT_ENCODING;
    public static final String DEFAULT_PREFIX = "classpath:/templates/";  //前缀
    public static final String DEFAULT_SUFFIX = ".html";                  //后缀
    private boolean checkTemplate = true;
    private boolean checkTemplateLocation = true;
    private String prefix = "classpath:/templates/";
    private String suffix = ".html";
    private String mode = "HTML";
    private Charset encoding;
 //.....   
}

@Controller
public class IndexController {
 
    @RequestMapping("/test")
    public String test(){
        return "test";
    }
}

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
<h1>test</h1>
</body>
</html>

@Controller
public class IndexController {
 
    @RequestMapping("/test")
    public String test(Model model){
        //存入数据
        model.addAttribute("msg","<h1>Hello SpringBoot!</h1>");
 
        model.addAttribute("users", Arrays.asList("hua","你好帅"));
        return "test";
    }
}

<!DOCTYPE html>
<html lang="en" xmlns:th="http://www.thymeleaf.org">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
<!--所有的html元素都可以被thymeleaf替换接管，  th：元素名-->
<div th:text="${msg}"></div>
<div th:utext="${msg}"></div>
<hr>
 
<h3 th:each="user:${users}" th:text="${user}"></h3>
 
</body>
</html>

package com.hua.config;
 
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.servlet.View;
import org.springframework.web.servlet.ViewResolver;
import org.springframework.web.servlet.config.annotation.ViewControllerRegistry;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurer;
 
import java.util.Locale;
 
@Configuration
//如果你想定制一些定制化的功能，只需要写这个组件，然后将他交给SpringBoot管理，SpringBoot就会帮我们自动装配
public class MyConfig implements WebMvcConfigurer {
 
    @Bean
    public ViewResolver getMyViewResolver(){
        return new MyViewResolver();
    }
        //localhost:8080/hua  实际上跳转到test.html中
    @Override
    public void addViewControllers(ViewControllerRegistry registry) {
        registry.addViewController("/hua").setViewName("/test");
    }
}
//只要实现了ViewResolver接口的类，我们就可以把它看作视图解析器
//自定义自己的试图解析器
class MyViewResolver implements ViewResolver{
 
    @Override
    public View resolveViewName(String viewName, Locale locale) throws Exception {
        return null;
    }
}

@Import({DelegatingWebMvcConfiguration.class})
public @interface EnableWebMvc {
}

 
public class DelegatingWebMvcConfiguration extends WebMvcConfigurationSupport {
  // ......
}

 
@Configuration(proxyBeanMethods = false)
@ConditionalOnWebApplication(type = Type.SERVLET)
@ConditionalOnClass({ Servlet.class, DispatcherServlet.class, WebMvcConfigurer.class })
// 这个注解的意思就是：容器中没有这个组件的时候，这个自动配置类才生效
@ConditionalOnMissingBean(WebMvcConfigurationSupport.class)
@AutoConfigureOrder(Ordered.HIGHEST_PRECEDENCE + 10)
@AutoConfigureAfter({ DispatcherServletAutoConfiguration.class, TaskExecutionAutoConfiguration.class,
    ValidationAutoConfiguration.class })
public class WebMvcAutoConfiguration {
    

package com.hua.pojo;
 
import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;
 
@Data
@AllArgsConstructor
@NoArgsConstructor
public class Department {
    private Integer id;
    private String name;
 
}

package com.hua.pojo;
 
import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;
 
import java.util.Date;
 
@Data
@NoArgsConstructor
@AllArgsConstructor
public class Employee {
    private Integer id;
    private String lastName;
    private String email;
    private Integer gender;//0：女,1：男
    private Department department;
    private Date birth;
 
}

package com.hua.Mapper;
 
import com.hua.pojo.Department;
import org.springframework.stereotype.Component;
import org.springframework.stereotype.Repository;
 
 
import java.util.Collection;
import java.util.HashMap;
import java.util.Map;
 
@Repository
public class DepatmentDao {
    //模拟数据
    private static Map<Integer, Department> departmentMap;
    static{
        departmentMap=new HashMap<>();//创建一个部门类
        departmentMap.put(101,new Department(101,"教学部"));
        departmentMap.put(102,new Department(101,"市场部"));
        departmentMap.put(103,new Department(101,"教研部"));
        departmentMap.put(104,new Department(101,"运营部"));
        departmentMap.put(105,new Department(101,"后勤部"));
    }
    //获得所有部门信息
    public Collection<Department>getDepartments(){
        return departmentMap.values();
    }
    //通过id得到部门
    public Department getDepartmentById(Integer id){
        return departmentMap.get(id);
    }
 
}

package com.hua.Mapper;
 
import com.hua.pojo.Department;
import com.hua.pojo.Employee;
import org.springframework.beans.factory.annotation.Autowired;
 
import java.util.*;
 
public class EmployeeDao {
    private static Map<Integer, Employee> employeeMap=null;
 
    @Autowired
    private static DepatmentDao depatmentDao;
 
    static{
        employeeMap=new HashMap<Integer,Employee>();
        employeeMap.put(101,new Employee(1,"华","123",
                1,depatmentDao.getDepartmentById(101),new Date()));
 
        employeeMap.put(102,new Employee(1,"红草","123",
                1,depatmentDao.getDepartmentById(102),new Date()));
 
        employeeMap.put(103,new Employee(1,"湖东狗","123",
                1,depatmentDao.getDepartmentById(103),new Date()));
 
        employeeMap.put(104,new Employee(1,"遮浪耀","123",
                1,depatmentDao.getDepartmentById(104),new Date()));
 
        employeeMap.put(105,new Employee(1,"甲子佳","123",
                1,depatmentDao.getDepartmentById(105),new Date()));
    }
    public static Integer id=106;
    //增加一个员工
    public void addEmployee(Employee employee){
        if (employee.getId()==null){
            employee.setId(id++);
        }else {
            throw new RuntimeException("改员工已经存在");
        }
        employee.setDepartment(depatmentDao.getDepartmentById(employee.getDepartment().getId()));
        employeeMap.put(employee.getId(),employee);
    }
    //查询全部员工
    public Collection<Employee>getEmployees(){
        return employeeMap.values();
    }
    //通过id查员工
    public Employee getEmployeeById(Integer id){
        return employeeMap.get(id);
    }
    //删除员工通过id
    public void deleteEmployeeById(Integer id){
        employeeMap.remove(id);
    }
}

package com.hua.controller;
 
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
 
@Controller
public class IndexController {
 
    @RequestMapping({"/index","/"})
    public String getIndex(){
        return "index";
    }
}

package com.hua.config;
 
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.servlet.LocaleResolver;
import org.springframework.web.servlet.View;
import org.springframework.web.servlet.ViewResolver;
import org.springframework.web.servlet.config.annotation.ViewControllerRegistry;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurer;
 
import java.util.Locale;
 
@Configuration
//如果你想定制一些定制化的功能，只需要写这个组件，然后将他交给SpringBoot管理，SpringBoot就会帮我们自动装配
public class MyConfig implements WebMvcConfigurer {
 
    @Override
    public void addViewControllers(ViewControllerRegistry registry) {
        registry.addViewController("/").setViewName("index.html");
        registry.addViewController("/index").setViewName("index.html");
}

#关闭thmeleaf的缓存
spring.thymeleaf.cache=false
 
#设置后 thymeleaf中的@{..}自动变换为@{./hua....}
server.servlet.context-path=/hua

xmlns:th="http://www.thymeleaf.org"

<!-- Bootstrap core CSS -->
<link th:href="@{/css/bootstrap.min.css}" rel="stylesheet">
 
<!-- Custom styles for this template -->
<link th:href="@{/css/signin.css}" rel="stylesheet">
 
<img class="mb-4" th:src="@{/img/bootstrap-solid.png}" alt="" width="72" height="72">

public class MessageSourceAutoConfiguration {
    private static final Resource[] NO_RESOURCES = new Resource[0];
 
    public MessageSourceAutoConfiguration() {
    }
 
    @Bean
    @ConfigurationProperties(prefix = "spring.messages") //我们的配置文件可以直接放在类路径下叫： messages.properties， 就可以进行国际化操作了
    public MessageSourceProperties messageSourceProperties() {
        return new MessageSourceProperties();
    }
 
    @Bean
    public MessageSource messageSource(MessageSourceProperties properties) {
        ResourceBundleMessageSource messageSource = new ResourceBundleMessageSource();
        if (StringUtils.hasText(properties.getBasename())) {　　　　　　　　//设置国际化文件的基础名
            messageSource.setBasenames(StringUtils.commaDelimitedListToStringArray(StringUtils.trimAllWhitespace(properties.getBasename())));
        }
 
        if (properties.getEncoding() != null) {
            messageSource.setDefaultEncoding(properties.getEncoding().name());
        }
 
        messageSource.setFallbackToSystemLocale(properties.isFallbackToSystemLocale());
        Duration cacheDuration = properties.getCacheDuration();
        if (cacheDuration != null) {
            messageSource.setCacheMillis(cacheDuration.toMillis());
        }
 
        messageSource.setAlwaysUseMessageFormat(properties.isAlwaysUseMessageFormat());
        messageSource.setUseCodeAsDefaultMessage(properties.isUseCodeAsDefaultMessage());
        return messageSource;
    }
}

# 配置文件放置的真实位置
spring.messages.basename=i18n.login

<h1 class="h3 mb-3 font-weight-normal" th:text="#{login.tip}">Please sign in</h1>
 
<input type="text" class="form-control" th:placeholder="#{login.username}" required="" autofocus="">
<input type="password" class="form-control" th:placeholder="#{login.password}" required="">
		
 <input type="checkbox" value="remember-me" >[[#{login.remember}]]
		    
<button class="btn btn-lg btn-primary btn-block" type="submit" >[[#{login.btn}]]</button>

 @Bean
        @ConditionalOnMissingBean
        @ConditionalOnProperty(
            prefix = "spring.mvc",
            name = {"locale"})
        public LocaleResolver localeResolver() {            //容器中没有就自己配，有的话就用用户配置的
            if (this.mvcProperties.getLocaleResolver() == org.springframework.boot.autoconfigure.web.servlet.WebMvcProperties.LocaleResolver.FIXED) {
                return new FixedLocaleResolver(this.mvcProperties.getLocale());
            } else {
                AcceptHeaderLocaleResolver localeResolver = new AcceptHeaderLocaleResolver();
                localeResolver.setDefaultLocale(this.mvcProperties.getLocale());
                return localeResolver;
            }
        }

 public Locale resolveLocale(HttpServletRequest request) {
        Locale defaultLocale = this.getDefaultLocale();        //默认的就是根据请求头带来的区域信息获取Locale进行国际化
        if (defaultLocale != null && request.getHeader("Accept-Language") == null) {
            return defaultLocale;
        } else {
            Locale requestLocale = request.getLocale();
            List<Locale> supportedLocales = this.getSupportedLocales();
            if (!supportedLocales.isEmpty() && !supportedLocales.contains(requestLocale)) {
                Locale supportedLocale = this.findSupportedLocale(request, supportedLocales);
                if (supportedLocale != null) {
                    return supportedLocale;
                } else {
                    return defaultLocale != null ? defaultLocale : requestLocale;
                }
            } else {
                return requestLocale;
            }
        }
    }

package com.hua.config;
 
import org.springframework.web.servlet.LocaleResolver;
import org.thymeleaf.util.StringUtils;
 
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.util.Locale;
 
public class MyLocaleResolver implements LocaleResolver {
    @Override
    public Locale resolveLocale(HttpServletRequest request) {
        String language = request.getParameter("l");
//        System.out.println(language);
        Locale locale = Locale.getDefault();
        if (!StringUtils.isEmpty(language)){
            String[] s = language.split("_");
            locale = new Locale(s[0],s[1]);
        }
        return locale;
    }
 
    @Override
    public void setLocale(HttpServletRequest request, HttpServletResponse response, Locale locale) {
 
    }
}

<a class="btn btn-sm" th:href="@{/index(l='zh_CN')}">中文</a>
<a class="btn btn-sm" th:href="@{/index(l='en_US')}">English</a>

<form class="form-signin" th:action="@{/user/login}"  >
    
<input type="text" name="username" class="form-control" th:placeholder="#{login.username}" required="" autofocus="">
    
<input type="password" name="password" class="form-control" th:placeholder="#{login.password}" required="">

package com.hua.controller;
 
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.thymeleaf.util.StringUtils;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.ResponseBody;
 
@Controller
public class loginController {
 
    @RequestMapping("/login")
    public String login(
            @RequestParam("username") String name,
            @RequestParam("pas") String password,
            Model model){
      
        if(!empty && "123".equals(password)){
            System.out.println(2);
            return "dashboard";
        }else {
            System.out.println(1);
            model.addAttribute("msg","密码错误或者用户名错误");
            return "index";
        }
    }
}

<!--         msg的消息为空  则不显示-->
         <p style="color: red" th:text="${msg}" th:if="${not #strings.isEmpty(msg)}"></p>

//登录成功！防止表单重复提交，我们重定向
return "redirect:/main.html";

package com.hua.config;
 
import org.springframework.web.servlet.HandlerInterceptor;
 
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
 
public class LoginHandlerInterceptot implements HandlerInterceptor {
    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
 
        if(request.getSession().getAttribute("loginUser")!=null){
            return true;
        }else {
            request.setAttribute("msg","请先登录");
            request.getRequestDispatcher("/index").forward(request,response);
        }
        return false;
    }
}

@Override
        public void addInterceptors(InterceptorRegistry registry) {
            registry.addInterceptor(new LoginHandlerInterceptot()).addPathPatterns("/**")
                    .excludePathPatterns("/index","/","/loging","/css/*","/img/*","/js/*");
        }

@RequestMapping("/goToList")
    public String goToList(Model model){
        Collection<Employee> employees = employeeDao.getEmployees();
        model.addAttribute("epms",employees);
            return "list";
    }

<!DOCTYPE html>
<html lang="en" xmlns:th="http://www.thymeleaf.org">
 
<!--顶部侧边栏-->
<nav class="navbar navbar-dark sticky-top bg-dark flex-md-nowrap p-0" th:fragment="topbar">
    <a class="navbar-brand col-sm-3 col-md-2 mr-0" href="http://getbootstrap.com/docs/4.0/examples/dashboard/#">[[${session.loginUser}]]</a>
    <input class="form-control form-control-dark w-100" type="text" placeholder="Search" aria-label="Search">
    <ul class="navbar-nav px-3">
        <li class="nav-item text-nowrap">
            <a class="nav-link" href="http://getbootstrap.com/docs/4.0/examples/dashboard/#">Sign out</a>
        </li>
    </ul>
</nav>
<!--左侧侧边栏-->
<nav class="col-md-2 d-none d-md-block bg-light sidebar" th:fragment="sidebar">
    <div class="sidebar-sticky">
        <ul class="nav flex-column">
            <li class="nav-item">
                <a th:class="${active=='main' ?' nav-link active' : 'nav-link'}" th:href="@{/main}">
                    <svg xmlns="http://www.w3.org/2000/svg" width="24" height="24" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round" class="feather feather-home">
                        <path d="M3 9l9-7 9 7v11a2 2 0 0 1-2 2H5a2 2 0 0 1-2-2z"></path>
                        <polyline points="9 22 9 12 15 12 15 22"></polyline>
                    </svg>
                    首页 <span class="sr-only">(current)</span>
                </a>
            </li>
            <li class="nav-item">
                <a class="nav-link" href="http://getbootstrap.com/docs/4.0/examples/dashboard/#">
                    <svg xmlns="http://www.w3.org/2000/svg" width="24" height="24" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round" class="feather feather-file">
                        <path d="M13 2H6a2 2 0 0 0-2 2v16a2 2 0 0 0 2 2h12a2 2 0 0 0 2-2V9z"></path>
                        <polyline points="13 2 13 9 20 9"></polyline>
                    </svg>
                    Orders
                </a>
            </li>
            <li class="nav-item">
                <a class="nav-link" href="http://getbootstrap.com/docs/4.0/examples/dashboard/#">
                    <svg xmlns="http://www.w3.org/2000/svg" width="24" height="24" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round" class="feather feather-shopping-cart">
                        <circle cx="9" cy="21" r="1"></circle>
                        <circle cx="20" cy="21" r="1"></circle>
                        <path d="M1 1h4l2.68 13.39a2 2 0 0 0 2 1.61h9.72a2 2 0 0 0 2-1.61L23 6H6"></path>
                    </svg>
                    Products
                </a>
            </li>
            <li class="nav-item">
                <a th:class="${active=='list'? 'nav-link active' :'nav-link'}" th:href="@{/goToList}">
                    <svg xmlns="http://www.w3.org/2000/svg" width="24" height="24" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round" class="feather feather-users">
                        <path d="M17 21v-2a4 4 0 0 0-4-4H5a4 4 0 0 0-4 4v2"></path>
                        <circle cx="9" cy="7" r="4"></circle>
                        <path d="M23 21v-2a4 4 0 0 0-3-3.87"></path>
                        <path d="M16 3.13a4 4 0 0 1 0 7.75"></path>
                    </svg>
                    员工管理
                </a>
            </li>
            <li class="nav-item">
                <a class="nav-link" href="http://getbootstrap.com/docs/4.0/examples/dashboard/#">
                    <svg xmlns="http://www.w3.org/2000/svg" width="24" height="24" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round" class="feather feather-bar-chart-2">
                        <line x1="18" y1="20" x2="18" y2="10"></line>
                        <line x1="12" y1="20" x2="12" y2="4"></line>
                        <line x1="6" y1="20" x2="6" y2="14"></line>
                    </svg>
                    Reports
                </a>
            </li>
            <li class="nav-item">
                <a class="nav-link" href="http://getbootstrap.com/docs/4.0/examples/dashboard/#">
                    <svg xmlns="http://www.w3.org/2000/svg" width="24" height="24" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round" class="feather feather-layers">
                        <polygon points="12 2 2 7 12 12 22 7 12 2"></polygon>
                        <polyline points="2 17 12 22 22 17"></polyline>
                        <polyline points="2 12 12 17 22 12"></polyline>
                    </svg>
                    Integrations
                </a>
            </li>
        </ul>
 
        <h6 class="sidebar-heading d-flex justify-content-between align-items-center px-3 mt-4 mb-1 text-muted">
            <span>Saved reports</span>
            <a class="d-flex align-items-center text-muted" href="http://getbootstrap.com/docs/4.0/examples/dashboard/#">
                <svg xmlns="http://www.w3.org/2000/svg" width="24" height="24" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round" class="feather feather-plus-circle"><circle cx="12" cy="12" r="10"></circle><line x1="12" y1="8" x2="12" y2="16"></line><line x1="8" y1="12" x2="16" y2="12"></line></svg>
            </a>
        </h6>
        <ul class="nav flex-column mb-2">
            <li class="nav-item">
                <a class="nav-link" href="http://getbootstrap.com/docs/4.0/examples/dashboard/#">
                    <svg xmlns="http://www.w3.org/2000/svg" width="24" height="24" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round" class="feather feather-file-text">
                        <path d="M14 2H6a2 2 0 0 0-2 2v16a2 2 0 0 0 2 2h12a2 2 0 0 0 2-2V8z"></path>
                        <polyline points="14 2 14 8 20 8"></polyline>
                        <line x1="16" y1="13" x2="8" y2="13"></line>
                        <line x1="16" y1="17" x2="8" y2="17"></line>
                        <polyline points="10 9 9 9 8 9"></polyline>
                    </svg>
                    Current month
                </a>
            </li>
            <li class="nav-item">
                <a class="nav-link" href="http://getbootstrap.com/docs/4.0/examples/dashboard/#">
                    <svg xmlns="http://www.w3.org/2000/svg" width="24" height="24" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round" class="feather feather-file-text">
                        <path d="M14 2H6a2 2 0 0 0-2 2v16a2 2 0 0 0 2 2h12a2 2 0 0 0 2-2V8z"></path>
                        <polyline points="14 2 14 8 20 8"></polyline>
                        <line x1="16" y1="13" x2="8" y2="13"></line>
                        <line x1="16" y1="17" x2="8" y2="17"></line>
                        <polyline points="10 9 9 9 8 9"></polyline>
                    </svg>
                    Last quarter
                </a>
            </li>
            <li class="nav-item">
                <a class="nav-link" href="http://getbootstrap.com/docs/4.0/examples/dashboard/#">
                    <svg xmlns="http://www.w3.org/2000/svg" width="24" height="24" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round" class="feather feather-file-text">
                        <path d="M14 2H6a2 2 0 0 0-2 2v16a2 2 0 0 0 2 2h12a2 2 0 0 0 2-2V8z"></path>
                        <polyline points="14 2 14 8 20 8"></polyline>
                        <line x1="16" y1="13" x2="8" y2="13"></line>
                        <line x1="16" y1="17" x2="8" y2="17"></line>
                        <polyline points="10 9 9 9 8 9"></polyline>
                    </svg>
                    Social engagement
                </a>
            </li>
            <li class="nav-item">
                <a class="nav-link" href="http://getbootstrap.com/docs/4.0/examples/dashboard/#">
                    <svg xmlns="http://www.w3.org/2000/svg" width="24" height="24" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round" class="feather feather-file-text">
                        <path d="M14 2H6a2 2 0 0 0-2 2v16a2 2 0 0 0 2 2h12a2 2 0 0 0 2-2V8z"></path>
                        <polyline points="14 2 14 8 20 8"></polyline>
                        <line x1="16" y1="13" x2="8" y2="13"></line>
                        <line x1="16" y1="17" x2="8" y2="17"></line>
                        <polyline points="10 9 9 9 8 9"></polyline>
                    </svg>
                    Year-end sale
                </a>
            </li>
        </ul>
    </div>
</nav>
</html>

<!DOCTYPE html>
<!-- saved from url=(0052)http://getbootstrap.com/docs/4.0/examples/dashboard/ -->
<html lang="en" xmlns:th="http://www.thymeleaf.org">
	<head>
		<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
		<meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no">
		<meta name="description" content="">
		<meta name="author" content="">
 
		<title>Dashboard Template for Bootstrap</title>
		<!-- Bootstrap core CSS -->
		<link th:href="@{/css/bootstrap.min.css}" rel="stylesheet">
 
		<!-- Custom styles for this template -->
		<link th:href="@{/css/dashboard.css}" rel="stylesheet">
		<style type="text/css">
			/* Chart.js */
			
			@-webkit-keyframes chartjs-render-animation {
				from {
					opacity: 0.99
				}
				to {
					opacity: 1
				}
			}
			
			@keyframes chartjs-render-animation {
				from {
					opacity: 0.99
				}
				to {
					opacity: 1
				}
			}
			
			.chartjs-render-monitor {
				-webkit-animation: chartjs-render-animation 0.001s;
				animation: chartjs-render-animation 0.001s;
			}
		</style>
	</head>
 
	<body>
	<!--顶部侧边栏-->
	<div th:replace="~{common/common::topbar}"></div>
	<!--侧边栏-->
		<div class="container-fluid">
			<div class="row">
					<div th:replace="~{common/common::sidebar(active='main')}"></div>
 
				<main role="main" class="col-md-9 ml-sm-auto col-lg-10 pt-3 px-4">
					<div class="chartjs-size-monitor" style="position: absolute; left: 0px; top: 0px; right: 0px; bottom: 0px; overflow: hidden; pointer-events: none; visibility: hidden; z-index: -1;">
						<div class="chartjs-size-monitor-expand" style="position:absolute;left:0;top:0;right:0;bottom:0;overflow:hidden;pointer-events:none;visibility:hidden;z-index:-1;">
							<div style="position:absolute;width:1000000px;height:1000000px;left:0;top:0"></div>
						</div>
						<div class="chartjs-size-monitor-shrink" style="position:absolute;left:0;top:0;right:0;bottom:0;overflow:hidden;pointer-events:none;visibility:hidden;z-index:-1;">
							<div style="position:absolute;width:200%;height:200%;left:0; top:0"></div>
						</div>
					</div>
					<div class="d-flex justify-content-between flex-wrap flex-md-nowrap align-items-center pb-2 mb-3 border-bottom">
						<h1 class="h2">Dashboard</h1>
						<div class="btn-toolbar mb-2 mb-md-0">
							<div class="btn-group mr-2">
								<button class="btn btn-sm btn-outline-secondary">Share</button>
								<button class="btn btn-sm btn-outline-secondary">Export</button>
							</div>
							<button class="btn btn-sm btn-outline-secondary dropdown-toggle">
                <svg xmlns="http://www.w3.org/2000/svg" width="24" height="24" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round" class="feather feather-calendar"><rect x="3" y="4" width="18" height="18" rx="2" ry="2"></rect><line x1="16" y1="2" x2="16" y2="6"></line><line x1="8" y1="2" x2="8" y2="6"></line><line x1="3" y1="10" x2="21" y2="10"></line></svg>
                This week
              </button>
						</div>
					</div>
 
					<canvas class="my-4 chartjs-render-monitor" id="myChart" width="1076" height="454" style="display: block; width: 1076px; height: 454px;"></canvas>
 
 
				</main>
			</div>
		</div>
 
		<!-- Bootstrap core JavaScript
    ================================================== -->
		<!-- Placed at the end of the document so the pages load faster -->
		<script type="text/javascript" th:src="@{/js/jquery-3.2.1.slim.min.js}" ></script>
		<script type="text/javascript" th:src="@{/js/popper.min.js}" ></script>
		<script type="text/javascript" th:src="@{/js/bootstrap.min.js}" ></script>
 
		<!-- Icons -->
		<script type="text/javascript" th:src="@{/js/feather.min.js}" ></script>
		<script>
			feather.replace()
		</script>
 
		<!-- Graphs -->
		<script type="text/javascript" th:src="@{/js/Chart.min.js}" ></script>
		<script>
			var ctx = document.getElementById("myChart");
			var myChart = new Chart(ctx, {
				type: 'line',
				data: {
					labels: ["Sunday", "Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday"],
					datasets: [{
						data: [15339, 21345, 18483, 24003, 23489, 24092, 12034],
						lineTension: 0,
						backgroundColor: 'transparent',
						borderColor: '#007bff',
						borderWidth: 4,
						pointBackgroundColor: '#007bff'
					}]
				},
				options: {
					scales: {
						yAxes: [{
							ticks: {
								beginAtZero: false
							}
						}]
					},
					legend: {
						display: false,
					}
				}
			});
		</script>
 
	</body>
 
</html>