springboot+mybatis实现登录功能，返回json

摘要：新建项目自己起的加入模块加入项目架构源代码接口类为下面的方法添加映射自动配置应用显示调用，构造器的作用结果登录成功登录失败类运行

    4.0.0


    
    com.weixinone
    ssmone
    1.0-SNAPSHOT


    
    
        org.springframework.boot
        spring-boot-starter-parent
        2.0.1.BUILD-SNAPSHOT
    

    
    
    
        
            org.springframework.boot
            spring-boot-starter-web
        

        
        
            org.mybatis.spring.boot
            mybatis-spring-boot-starter
            1.3.2
        
        
        
            mysql
            mysql-connector-java
        
        
        
            com.google.code.gson
            gson
            2.8.2
        
    



    
    
        
            
                org.springframework.boot
                spring-boot-maven-plugin
            
        
    

    
    
        
            spring-snapshots
            https://repo.spring.io/snapshot
            true
        
        
            spring-milestones
            https://repo.spring.io/milestone
        
    
    
        
            spring-snapshots
            https://repo.spring.io/snapshot
        
        
            spring-milestones
            https://repo.spring.io/milestone
        
    

3.1 Mapperer接口

@Mapper
public interface ManMapper {
    @Select("SELECT user, password FROM man WHERE user = #{user}" +
            " AND password = #{password}")
    Man findByState(@Param("user") String username,
                    @Param("password") String password);
}

@RestController
//为 @RequestMapping("/")下面的denglu方法添加映射
@EnableAutoConfiguration
////自动配置应用
@SpringBootApplication
public class Example{

    private final ManMapper manMapper;
//    显示调用，构造器的作用
    public Example(ManMapper manMapper) {
        this.manMapper = manMapper;
    }

    public static void main(String[] args) throws Exception {
        SpringApplication.run(Example.class, args);
    }

    @RequestMapping(value = "/denglu", method = RequestMethod.GET)
    @ResponseBody
    public String denglu(@RequestParam(value = "name", required = true) String name,
                         @RequestParam(value = "pwd", required = true) String pwd) throws Exception {


        Logger.getGlobal().info(pwd);
        Logger.getGlobal().info("结果"+this.manMapper.findByState(name, pwd));

        if (this.manMapper.findByState(name, pwd)!=null){
            String msg="登录成功";
            Gson gson = new Gson();
            return gson.toJson(msg);
        }
        else {
            String msg="登录失败";
            Gson gson = new Gson();
            return gson.toJson(msg);
        }
    }
}

public  class Man implements Serializable{
    private Long id;
    private String user;
    private String password;


    public Long getId() {
        return id;
    }

    public void setId(Long id) {
        this.id = id;
    }

    public String getUser() {
        return user;
    }

    public void setUser(String user) {
        this.user = user;
    }

    public String getPassword() {
        return password;
    }

    public void setPassword(String password) {
        this.password = password;
    }

    @Override
    public String toString() {
        return "Man{" +
                "id=" + id +
                ", user="" + user + """ +
                ", password="" + password + """ +
                "}";
    }
}

CREATE TABLE IF NOT EXISTS man  (
  id int(11) NOT NULL AUTO_INCREMENT,
  user varchar(255) NOT NULL,
  password varchar(255) NOT NULL,
  PRIMARY KEY (id)
)CHARACTER SET utf8;
INSERT INTO man VALUES (1, "test", "123");