SpringMVC实现RESTful服务

　　　　　　　　　　SpringMVC实现RESTful服务

　　

这里只说service,controller层的代码。Mapper层则直接继承Mapper<T>则可以，记住mybatis-config.xml一定要配置分页插件和mapper类的插件。

　　1.查询所有用户

　　service：

     @Autowired
     private IUserMapper userMapper;

     @Override
     public EasyUIResult getAllUser(Integer page, Integer rows) {
         // TODO Auto-generated method stub

         // 后台帮我们封装了一个page并且直接存到本地线程
         PageHelper.startPage(page, rows);
         Example example = new Example(User.class);
         example.setOrderByClause("updated desc");
         List<User> list = userMapper.selectByExample(example);
         PageInfo<User> pageInfo = new PageInfo<>(list);
         return new EasyUIResult(pageInfo.getTotal(), pageInfo.getList());
     }

　　controller：

     /**
      * 查询所有用户 返回数据类型为：json格式
      *
      * @param page
      * @param rows
      * @return
      */
     @RequestMapping(value = "list", method = { RequestMethod.POST })
     public @ResponseBody EasyUIResult finAllUser(@RequestParam(value = "page", defaultValue = "") Integer page,
             @RequestParam(value = "rows", defaultValue = "") Integer rows) {
         return userService.getAllUser(page, rows);
     }

　　　　2.根据用户id查询用户信息

　　service:

     @Override
     public User queryUserById(Long id) {
         // TODO Auto-generated method stub
         return userMapper.selectByPrimaryKey(id);
     }

　　cotroller:

 @Controller
 @RequestMapping("user/rest")
 public class RestUserController {

     @Autowired
     private IUserService userService;

     /**
      * 根据id查询用户信息
      *
      * @param id
      * @return
      */
     @RequestMapping(value = "{userId}", method = RequestMethod.GET)
     public ResponseEntity<User> queryUserById(@PathVariable(value = "userId") Long id) {
         try {
             User user = userService.queryUserById(id);
             if (user == null) {
                 return ResponseEntity.status(HttpStatus.NOT_FOUND).body(null);
             }
             // return ResponseEntity.ok(user);
         } catch (Exception e) {
             // TODO: handle exception
             e.printStackTrace();
         }
         // return ResponseEntity.status(500).body(null);
         // 系统内部异常
         return ResponseEntity.status(HttpStatus.INTERNAL_SERVER_ERROR).body(null);
     }

　　　　3.添加一个用户

　　service:

 @Override
     public Boolean saveUser(User user) {
         // TODO Auto-generated method stub
         return userMapper.insertSelective(user) == 1;
     }

　　controller:

     /**
      * 添加一个用户
      *
      * @param user
      * @return
      */
     @RequestMapping(method = RequestMethod.POST)
     public ResponseEntity<Void> addUser(User user) {
         try {
             userService.saveUser(user);
             return ResponseEntity.status(HttpStatus.CREATED).build();
             // return ResponseEntity.ok(user);
         } catch (Exception e) {
             // TODO: handle exception
             e.printStackTrace();
         }
         return ResponseEntity.status(HttpStatus.INTERNAL_SERVER_ERROR).build();
     }

　　4.修改用户

　　service：

 @Override
     public boolean updateUsers(User user) {
         // TODO Auto-generated method stub
         // 修改用户所有信息
         // userMapper.updateByPrimaryKey(User);
         // 修改不为空的字段
         // userMapper.updateByPrimaryKeySelective(record);
         return userMapper.updateByPrimaryKey(user) == 1;
     }

　　controller：

    /**
     * 跟新用户
     *
     * @param user
     * @return
     */
    @RequestMapping(method = RequestMethod.PUT)
    public ResponseEntity<Void> updateUser(User user) {
        try {
            boolean b = userService.updateUsers(user);
            if (b) {
                return ResponseEntity.status(HttpStatus.NO_CONTENT).build();
            }
            // return ResponseEntity.ok(user);
        } catch (Exception e) {
            // TODO: handle exception
            e.printStackTrace();
        }
        return ResponseEntity.status(HttpStatus.INTERNAL_SERVER_ERROR).build();
    }

　　5.删除

　　service：

     @Override
     public boolean deleteUser(Long id) {
         // TODO Auto-generated method stub
         return userMapper.deleteByPrimaryKey(id) == 1;
     }

　　controller：

     /**
      * 删除一个用户
      *
      * @param id
      * @return
      */
     @RequestMapping(method = RequestMethod.DELETE)
     public ResponseEntity<Void> deleteUser(@RequestParam(value = "id", defaultValue = "0") Long id) {
         try {
             if (id == 0) {
                 return ResponseEntity.status(HttpStatus.BAD_REQUEST).build();
             }
             boolean b = userService.deleteUser(id);
             if (b) {
                 return ResponseEntity.status(HttpStatus.NO_CONTENT).build();
             }
             // return ResponseEntity.ok(user);
         } catch (Exception e) {
             // TODO: handle exception
             e.printStackTrace();
         }
         return ResponseEntity.status(HttpStatus.INTERNAL_SERVER_ERROR).build();
     }

　　delete删除时比较特殊：一定要注意

　

　　

　　进行删除和修改时，要在web.xml中配置过滤器（补充）：

 <!--
         将POST请求转化为DELETE或者是PUT
         要用_method指定真正的请求参数
      -->
     <filter>
         <filter-name>HiddenHttpMethodFilter</filter-name>
         <filter-class>org.springframework.web.filter.HiddenHttpMethodFilter</filter-class>
     </filter>
     <filter-mapping>
         <filter-name>HiddenHttpMethodFilter</filter-name>
         <url-pattern>/*</url-pattern>
     </filter-mapping>

 <!-- 解决PUT请求无法提交表单数据的问题 -->
     <filter>
         <filter-name>HttpMethodFilter</filter-name>
         <filter-class>org.springframework.web.filter.HttpPutFormContentFilter</filter-class>
     </filter>
     <filter-mapping>
         <filter-name>HttpMethodFilter</filter-name>
         <url-pattern>/*</url-pattern>
     </filter-mapping>

　　大功告成！！