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本文讲解了一个简单的SSM整合流程。实现了对数据库表的增删查操作
SSM 编程,即 SpringMVC + Spring + MyBatis 整合,是当前最为流行的 JavaEE 开发技术架构。其实 SSM 整合的实质,仅仅就是将 MyBatis整合入 Spring。因为 SpringMVC原本就是 Spring
的一部分,不用专门整合。
SSM 整合的实现方式可分为两种:基于 XML 配置方式,基于注解方式。
用户发起请求---->SpringMvc接受请求---->交给Spring中的service对象---->最后有service调用dao来处理数据。
1.SpringMvc的容器:负责管理Controller对象以及web相关的对象。
2.Spring的容器:负责管理service,dao,工具类等对象。
这是我本次项目所使用的学生表
需要加入到的依赖有: <!--springmvc依赖--> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-webmvc</artifactId> <version>5.2.5.RELEASE</version> </dependency> <!--mybatis依赖--> <dependency> <groupId>org.mybatis</groupId> <artifactId>mybatis</artifactId> <version>3.5.1</version> </dependency> <!--spring核心。ioc--> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-context</artifactId> <version>5.2.5.RELEASE</version> </dependency> <!--用于spring的事务--> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-tx</artifactId> <version>5.2.5.RELEASE</version> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-jdbc</artifactId> <version>5.2.5.RELEASE</version> </dependency> <!--mybatis和spring集成依赖--> <dependency> <groupId>org.mybatis</groupId> <artifactId>mybatis-spring</artifactId> <version>1.3.1</version> </dependency> <!--mysql驱动--> <dependency> <groupId>mysql</groupId> <artifactId>mysql-connector-java</artifactId> <version>8.0.19</version> </dependency> <!--jackson依赖--> <dependency> <groupId>com.fasterxml.jackson.core</groupId> <artifactId>jackson-core</artifactId> <version>2.9.0</version> </dependency> <dependency> <groupId>com.fasterxml.jackson.core</groupId> <artifactId>jackson-databind</artifactId> <version>2.9.0</version> </dependency> <!--阿里公司的数据库连接池--> <dependency> <groupId>com.alibaba</groupId> <artifactId>druid</artifactId> <version>1.1.12</version> </dependency> <!--servlet依赖--> <dependency> <groupId>javax.servlet</groupId> <artifactId>javax.servlet-api</artifactId> <version>3.1.0</version> <scope>provided</scope> </dependency> <!--jsp依赖--> <dependency> <groupId>javax.servlet.jsp</groupId> <artifactId>jsp-api</artifactId> <version>2.2.1-b03</version> <scope>provided</scope> </dependency> <!--加入监听器依赖--> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-web</artifactId> <version>5.2.5.RELEASE</version> </dependency>
1.注册DispatcherServlet(中央调度器)。
目的有两点:
1)创建SpringMvc容器,创建了SpringMvc容器了就会有Controller对象。
2)DispatcherServlet是一个Servlet,有了Servlet才能够处理请求
目的是创建spring容器,这样才有dao,service等对象。
目的是解决post请求方式出现的乱码情况。
下面是我配置的xml文件
<?xml version="1.0" encoding="UTF-8"?> <web-app xmlns="http://xmlns.jcp.org/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_4_0.xsd" version="4.0"> <!--中央调度器--> <servlet> <servlet-name>fearless</servlet-name> <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class> <init-param> <param-name>contextConfigLocation</param-name> <param-value>classpath:conf/dispatcherServlet.xml</param-value> </init-param> <load-on-startup>1</load-on-startup> </servlet> <servlet-mapping> <servlet-name>fearless</servlet-name> <url-pattern>/</url-pattern> </servlet-mapping> <!--注册监听器。用于创建spring容器--> <context-param> <param-name>contextConfigLocation</param-name> <param-value>classpath:conf/applicationContext.xml</param-value> </context-param> <listener> <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class> </listener> <!--关闭mysql资源的监听器--> <listener> <listener-class>com.fearless.listener.ContextFinalizer</listener-class> </listener> <!--声明字符集过滤器。用于解决post方式请求乱码的现象--> <filter> <filter-name>characterEncodingFilter</filter-name> <filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class> <init-param> <param-name>encoding</param-name> <param-value>utf-8</param-value> </init-param> <init-param> <param-name>forceRequestEncoding</param-name> <param-value>true</param-value> </init-param> <init-param> <param-name>forceResponseEncoding</param-name> <param-value>true</param-value> </init-param> </filter> <filter-mapping> <filter-name>characterEncodingFilter</filter-name> <url-pattern>/*</url-pattern> </filter-mapping> </web-app>
下面是SpringMvc的配置文件,文件名叫dispatcherServlet.xml
<?xml version="1.0" encoding="UTF-8"?> <beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:context="http://www.springframework.org/schema/context" xmlns:mvc="http://www.springframework.org/schema/mvc" xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd http://www.springframework.org/schema/context https://www.springframework.org/schema/context/spring-context.xsd http://www.springframework.org/schema/mvc https://www.springframework.org/schema/mvc/spring-mvc.xsd"> <!--springMvc配置文件。用于管理Controller对象以及Web相关的对象--> <!--使用组件扫描器来创建Controller对象--> <context:component-scan base-package="com.fearless.controller"/> <!--声明视图解析器--> <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver"> <property name="prefix" value="/WEB-INF/view/"/> <property name="suffix" value=".jsp"/> </bean> <!--声明注解驱动--> <mvc:annotation-driven/> <mvc:default-servlet-handler/> </beans>
下面是Spring 的配置文件,文件名叫application.xml
<?xml version="1.0" encoding="UTF-8"?> <beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:context="http://www.springframework.org/schema/context" xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd http://www.springframework.org/schema/context https://www.springframework.org/schema/context/spring-context.xsd"> <!--spring配置文件。用于管理service,dao,工具类等对象。--> <!--指定属性配置文件--> <context:property-placeholder location="classpath:conf/jdbc.properties"></context:property-placeholder> <!--数据源对象--> <bean id="dataSource" class="com.alibaba.druid.pool.DruidDataSource" init-method="init" destroy-method="close"> <property name="url" value="${jdbc.url}"/> <property name="username" value="${jdbc.username}"/> <property name="password" value="${jdbc.password}"/> </bean> <!--factory对象--> <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean"> <property name="dataSource" ref="dataSource"/> <property name="configLocation" value="classpath:conf/mybatis.xml"/> </bean> <!--声明mybatis的扫描器来创建dao对象--> <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer"> <property name="sqlSessionFactoryBeanName" value="sqlSessionFactory"/> <property name="basePackage" value="com.fearless.dao"/> </bean> <!--使用component来创建service对象--> <context:component-scan base-package="com.fearless.service"/> <!--事务的配置:1)注解的配置 2)aspectj的配置--> </beans>
下面是Mybatis的配置文件
<?xml version="1.0" encoding="UTF-8" ?> <!DOCTYPE configuration PUBLIC "-//mybatis.org//DTD Config 3.0//EN" "http://mybatis.org/dtd/mybatis-3-config.dtd"> <configuration> <!--别名设置--> <typeAliases> <package name="com.fearless.entity"/> </typeAliases> <!-- sql mapper(sql映射文件) 的位置 --> <mappers> <package name="com.fearless.dao"/> </mappers> </configuration>
以及数据的属性配置文件
jdbc.url=jdbc:mysql://localhost:3306/ssm?useSSL=false&serverTimezone=CTT
jdbc.username=root
jdbc.password=123456
首先是实体类Student放在entity包下`
package com.fearless.entity; public class Student { private Integer id; private String name; private String email; private Integer age; public String toString() { return "Student{" + "id=" + id + ", name='" + name + '\'' + ", email='" + email + '\'' + ", age=" + age + '}'; } public Integer getId() { return id; } public void setId(Integer id) { this.id = id; } public String getName() { return name; } public void setName(String name) { this.name = name; } public String getEmail() { return email; } public void setEmail(String email) { this.email = email; } public Integer getAge() { return age; } public void setAge(Integer age) { this.age = age; } }
下面是dao包中的dao接口和mapper文件
dao接口
package com.fearless.dao; import com.fearless.entity.Student; import java.util.List; public interface StudentDao { int addStudent(Student student); List<Student> queryAllStudent(); int deleteStudent(Integer id); }
mapper文件
<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE mapper
PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
"http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper namespace="com.fearless.dao.StudentDao">
<select id="queryAllStudent" resultType="Student">
select id,name,age from student order by id
</select>
<insert id="addStudent">
insert into student(id,name,email,age) values (#{id},#{name},#{email},#{age})
</insert>
<delete id="deleteStudent">
delete from student where id=#{id}
</delete>
</mapper>
下面是service接口及其实现类,放在service包下
service接口
package com.fearless.service;
import com.fearless.entity.Student;
import java.util.List;
public interface StudentService {
List<Student> queryStudent();
int addStudents(Student student);
int deleteStudentById(Integer id);
}
service接口实现类
package com.fearless.service.impl; import com.fearless.dao.StudentDao; import com.fearless.entity.Student; import com.fearless.service.StudentService; import org.springframework.stereotype.Service; import javax.annotation.Resource; import java.util.List; @Service public class StudentServiceImpl implements StudentService { /*引用类型的自动注入@Autowired,@Resource * @Resource:先按byName,byName找不到了再用byType * @Autowired使用byType。 * */ @Resource private StudentDao studentDao; //查询所有学生 public List<Student> queryStudent() { List<Student> list=studentDao.queryAllStudent(); return list; } //注册学生 public int addStudents(Student student) { int num=studentDao.addStudent(student); return num; } //删除学生 public int deleteStudentById(Integer id) { int num=studentDao.deleteStudent(id); return num; } }
下面是controller类。放在controller包下
package com.fearless.controller; import com.fearless.entity.Student; import com.fearless.service.StudentService; import org.springframework.stereotype.Controller; import org.springframework.web.bind.annotation.RequestMapping; import org.springframework.web.bind.annotation.ResponseBody; import org.springframework.web.servlet.ModelAndView; import javax.annotation.Resource; import java.util.List; @Controller @RequestMapping("/student") public class ControllerOne { //引用数据类型赋值(自动注入) @Resource private StudentService service; //注册学生的处理器方法 @RequestMapping(value = "/register") public ModelAndView addStudentController(Student student){ //调用service对象来处理请求 int num=service.addStudents(student); String tips=""; if(num>0){ //注册成功 tips=student.getName()+"注册成功"; } ModelAndView mv=new ModelAndView(); mv.addObject("注册结果",tips); mv.setViewName("result"); return mv; } //删除学生的处理器方法 @RequestMapping(value = "/delete") public ModelAndView doDelete(Integer id){ String tips="编号是"+id+"删除失败"; //调用service对象来处理请求业务 int num=service.deleteStudentById(id); if(num>0){ tips="iD是"+id+"的学生信息删除成功"; } ModelAndView mv=new ModelAndView(); mv.addObject("tip",tips); mv.setViewName("result2"); return mv; } //浏览所有学生的处理器方法 @RequestMapping(value = "/all") @ResponseBody public List<Student> doView(){ return service.queryStudent(); } }
这是各类视图的结构
index.jsp页面代码
<%@ page contentType="text/html;charset=UTF-8" language="java" %> <html> <head> <title>梦开始的地方。</title> </head> <body> <center> <h5 style="color: blue">开始吧</h5> <h3><a href="add.jsp">注册学生</a></h3> <h3><a href="delete.jsp">删除学生</a></h3> <h3><a href="viewAllStudents.jsp">浏览所有学生</a></h3> </center> </body> </html>
add.jsp页面代码
<%@ page contentType="text/html;charset=UTF-8" language="java" %> <html> <head> <title>注册页面</title> </head> <body> <body> <center> <h5 style="color: blue">开始吧</h5> <form action="student/register" method="post"> <table border="2"> <tr> <td>ID</td> <td><input type="text" name="id"><br></td> </tr> <tr> <td>名字</td> <td><input type="text" name="name"><br></td> </tr> <tr> <td>邮箱</td> <td><input type="text" name="email"><br></td> </tr> <tr> <td>年龄</td> <td><input type="text" name="age"><br></td> </tr> <tr> <td><input type="submit" value="注册"></td> </tr> </table> </form> </center> </body> </body> </html>
delete.jsp页面代码
<%@ page contentType="text/html;charset=UTF-8" language="java" %> <html> <head> <title>注册页面</title> </head> <body> <body> <center> <h5 style="color: blue">开始吧</h5> <form action="student/register" method="post"> <table border="2"> <tr> <td>ID</td> <td><input type="text" name="id"><br></td> </tr> <tr> <td>名字</td> <td><input type="text" name="name"><br></td> </tr> <tr> <td>邮箱</td> <td><input type="text" name="email"><br></td> </tr> <tr> <td>年龄</td> <td><input type="text" name="age"><br></td> </tr> <tr> <td><input type="submit" value="注册"></td> </tr> </table> </form> </center> </body> </body> </html>
viewAllStudents.jsp页面代码。这里我们使用了jQuery的ajax请求。所以需要导入jQuery的库文件。
<%@ page contentType="text/html;charset=UTF-8" language="java" %> <html> <head> <title>所有学生</title> <script type="text/javascript" src="js/myjQuery.js"></script> <script type="text/javascript"> $(function(){ //页面加载完毕直接执行loadStudents方法 loadStudents() $("#btn01").click(function () { loadStudents() }) }) function loadStudents() { $.ajax({ url:"student/all", type:"get", dataType:"json", success(resp){ //先将旧的数据清除 $("#info").html("") $.each(resp,function(i,n){ //添加新的数据 $("#info").append("<tr>") .append("<td>"+n.id+"</td>") .append("<td>"+n.name+"</td>") .append("<td>"+n.email+"</td>") .append("<td>"+n.age+"</td>") .append("</tr>") }) } }) } </script> </head> <body> <center> <div> <table border="3"> <thead> <tr> <td>id</td> <td>姓名</td> <td>邮箱</td> <td>年龄</td> </tr> </thead> <tbody id="info"> </tbody> </table> </div> <a href="student/all">浏览</a><br> <input type="button" id="btn01" value="按钮"> </center> </body> </html>
result1.jsp代码
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
<title>结果页面</title>
</head>
<body>
<center>
<h4>结果页面</h4>
<h4>${注册结果}</h4>
</center>
</body>
</html>
result2.jsp代码
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
<title>结果页面</title>
</head>
<body>
<center>
<h4 style="color: darkgoldenrod">${tip}</h4>
</center>
</body>
</html>
index.jsp界面
注册功能
注册成功
查看数据库表,数据增加上去了
delete.jsp页面,这里我们把刚刚注册的学生"张三"删除
给出提示,删除成功,
再到数据库表中确认一下,发现id是1的学生张三不见了。说明删除成功
viewAllStudents.jsp页面,这里我们刚才在viewAllStudents.jsp中设定了当页面加载完毕后自动显示查询结果,
这样我们就完成了一个简单的SMM整合项目
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