
<!DOCTYPE html>
<html lang="en" xmlns:th="http://www.thymeleaf.org">
<head>
    <meta charset="UTF-8">
    <title>登录页面</title>
</head>
<body>
<form th:action="@{/loginEntity}" method="post">
    <span th:text="${result}"></span>
    <input type="username" th:placeholder="请输入用户名" name="username"/>
    <input type="password" placeholder="请输入密码" name="password" />
    <input type="submit" th:value="登录"/>
</form>
 
</body>
</html>


@RequestMapping("/gotoLogin")
    public String gotoLogin() {
        return "login";
    }
    @RequestMapping("/loginEntity")
    public ModelAndView loginEntity(User user) {
        ModelAndView mav = new ModelAndView();
        String result = restTemplate.postForObject("http://PROVIDER/loginProvider", user, String.class);
        mav.addObject("result", result);
        mav.setViewName("login");
        return mav;
    }

1.3生产者

因为使用负载均衡，所以不知道第一次回去那个生产者，所以每个生产者都需要写loginProvider。

依赖


<dependency>         
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-netflix-eureka-client</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-configuration-processor</artifactId>
            <optional>true</optional>
        </dependency>
        <dependency>
            <groupId>org.example.entity</groupId>
            <artifactId>common</artifactId>
            <version>1.0-SNAPSHOT</version>
            <scope>compile</scope>
        </dependency>
        <dependency>
            <groupId>com.mysql</groupId>
            <artifactId>mysql-connector-j</artifactId>
        </dependency>
        <dependency>
            <groupId>org.mybatis.spring.boot</groupId>
            <artifactId>mybatis-spring-boot-starter</artifactId>
</dependency>

配置文件

三个生产者每个生产者各使用一个数据库，所以这里以生产者3为例


server:
  port: 8003
eureka:
  client:
    service-url:
      defaultZone: http://localhost:7000/eureka/
spring:
  datasource:
    driver-class-name: com.mysql.cj.jdbc.Driver
    url: jdbc:mysql://localhost:3306/my_sql_3
    username: root
    password: root
  application:
    name: PROVIDER
mybatis:
  mapper-locations: classpath:/mapper/*.xml
  configuration:
    log-impl: org.apache.ibatis.logging.stdout.StdOutImpl
  type-aliases-package: org.example.entity

控制层


@RestController
public class MyController {
    @Autowired
    MyUserService myUserService;
 
    @RequestMapping("/loginProvider")
    public String loginProvider(@RequestBody User user) {
        User user1 = myUserService.getUser(user);
        if(user1!=null){
            return "登录成功,欢迎";
        }else {
            return "登录失败,暂无该用户,请注册";
        }
    }

访问层


@Mapper
public interface MyUserDao {
  public userEntity getUser(userEntity user);
}

实体类


@Data
public class userEntity {
    public int id;
    public String username;
    public String password;
}

实现类


@Service
public class MyUserServiceImpl implements MyUserService {
    @Autowired
    MyUserDao myUserDao;
    @Override
    public userEntity getUser(userEntity user) {
        return myUserDao.getUser(user);
    }
}

mapper


<mapper namespace="org.example.dao.MyUserDao">
    <select id="getUser" resultType="User">
        select *
        from my_user
        where username = #{username} and password=#{password}
    </select>
</mapper>

1.4效果

进入gotoLogin页面

登录失败

登录成功

2.Feign方式

Feign是Spring Cloud提供的声明式、模板化的HTTP生产者，它使得调用远程服务就像调用本地服务一样简单，只需要创建一个接口并添加一个注解即可。

Spring Cloud集成Feign并对其进行了增强，使Feign支持了Spring MVC注解；Feign默认集成了Ribbon，所以Fegin默认就实现了负载均衡的效果。Spring Cloud 常见的集成方式是使用Feign+Ribbon技术来完成服务间远程调用及负载均衡的。

前端传值

后端传值

2.1Service

@FeignClient的属性name：指定FeignClient的名称，如果项目使用了Ribbon，name属性会作为微服务的名称，用于服务发现。


@Service
@FeignClient(name = "PROVIDER",fallbackFactory= MyFeignClientFallbackFactory.class)//name=客户端远程服务的名字,fallbackFactory一旦出现错误进入这个类中
public interface UserService {
 
    @RequestMapping("/loginProvider")
    public String loginProvider(User user);
 
    @RequestMapping("/getuser/{name}")
    public String getuser(@PathVariable("name") String name);
}

2.2生产者


@RequestMapping("/loginEntity")
    public ModelAndView loginEntity(User user) {
        ModelAndView mav = new ModelAndView();
//        String result = restTemplate.postForObject("http://PROVIDER/loginProvider", user, String.class);
        String result = userService.loginProvider(user);
        mav.addObject("result", result);
        mav.setViewName("login");
        return mav;
    }

最后效果一致。

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