SpringMVC implements RESTful services

　　　　　　　　　　SpringMVC implements RESTful services

　　

Only the code of the service and controller layers is mentioned here. The Mapper layer can directly inherit Mapper<T>, remember that mybatis-config.xml must configure the paging plugin and mapper class plugin.

　　1. Query all users

　　service：

 

1      @Autowired
 2      private IUserMapper userMapper;
 3  
4      @Override
 5      public EasyUIResult getAllUser(Integer page, Integer rows) {
 6          // TODO Auto-generated method stub
 7  
8          // The background helps us encapsulate a page and store it directly in the local thread 
9          PageHelper.startPage(page, rows);
 10          Example example = new Example( User.class );
 11          example.setOrderByClause("updated desc" );
 12          List<User> list = userMapper.selectByExample(example);
 13         PageInfo<User> pageInfo = new PageInfo<>(list);
14         return new EasyUIResult(pageInfo.getTotal(), pageInfo.getList());
15     }

　　controller：

 

1      /* *
 2       * Query all users The return data type is: json format
 3       * 
 4       * @param page
 5       * @param rows
 6       * @return
 7       */ 
8      @RequestMapping(value = " list " , method = { RequestMethod. POST })
 9      public @ResponseBody EasyUIResult finAllUser(@RequestParam(value = " page " , defaultValue = " 1 " ) Integer page,
 10              @RequestParam(value = " rows " , defaultValue ="5") Integer rows) {
11         return userService.getAllUser(page, rows);
12     }

 

　　　　2. Query user information based on user id

　　service:

1     @Override
2     public User queryUserById(Long id) {
3         // TODO Auto-generated method stub
4         return userMapper.selectByPrimaryKey(id);
5     }

 

　　cotroller:

 1 @Controller
 2 @RequestMapping("user/rest")
 3 public class RestUserController {
 4 
 5     @Autowired
 6     private IUserService userService;
 7 
 8     /**
 9      * 根据id查询用户信息
10      * 
11      * @param id
12      * @return
13      */
14     @RequestMapping(value = "{userId}", method = RequestMethod.GET)
15     public ResponseEntity<User> queryUserById(@PathVariable(value = "userId") Long id) {
16         try {
17             User user = userService.queryUserById(id);
18             if (user == null) {
19                 return ResponseEntity.status(HttpStatus.NOT_FOUND).body(null);
20             }
21             // return ResponseEntity.ok(user);
22         } catch (Exception e) {
23             // TODO: handle exception
24             e.printStackTrace();
25         }
26         // return ResponseEntity.status(500).body(null);
27          // System internal exception 
28          return ResponseEntity.status(HttpStatus.INTERNAL_SERVER_ERROR).body( null );
 29      }

　　　　3. Add a user

　　service:

1 @Override
2     public Boolean saveUser(User user) {
3         // TODO Auto-generated method stub
4         return userMapper.insertSelective(user) == 1;
5     }

　　controller:

 1     /**
 2      * 添加一个用户
 3      * 
 4      * @param user
 5      * @return
 6      */
 7     @RequestMapping(method = RequestMethod.POST)
 8     public ResponseEntity<Void> addUser(User user) {
 9         try {
10             userService.saveUser(user);
11             return ResponseEntity.status(HttpStatus.CREATED).build();
12             // return ResponseEntity.ok(user);
13         } catch (Exception e) {
14             // TODO: handle exception
15             e.printStackTrace();
16         }
17         return ResponseEntity.status(HttpStatus.INTERNAL_SERVER_ERROR).build();
18     }

 

　　4. Modify the user

　　service：

1  @Override
 2      public  boolean updateUsers(User user) {
 3          // TODO Auto-generated method stub
 4          // Modify all user information
 5          // userMapper.updateByPrimaryKey(User);
 6          // Modify non-empty fields
 7          // userMapper.updateByPrimaryKeySelective(record); 
8          return userMapper.updateByPrimaryKey(user) == 1 ;
 9      }

　　controller：

    /**
     * Follow up with new users
     *
     * @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. Delete

　　service：

1     @Override
2     public boolean deleteUser(Long id) {
3         // TODO Auto-generated method stub
4         return userMapper.deleteByPrimaryKey(id) == 1;
5     }

　　controller：

 1     /**
 2      * 删除一个用户
 3      * 
 4      * @param id
 5      * @return
 6      */
 7     @RequestMapping(method = RequestMethod.DELETE)
 8     public ResponseEntity<Void> deleteUser(@RequestParam(value = "id", defaultValue = "0") Long id) {
 9         try {
10             if (id == 0) {
11                 return ResponseEntity.status(HttpStatus.BAD_REQUEST).build();
12             }
13             boolean b = userService.deleteUser(id);
14             if (b) {
15                 return ResponseEntity.status(HttpStatus.NO_CONTENT).build();
16             }
17             // return ResponseEntity.ok(user);
18         } catch (Exception e) {
19             // TODO: handle exception
20             e.printStackTrace();
21         }
22         return ResponseEntity.status(HttpStatus.INTERNAL_SERVER_ERROR).build();
23     }

 

　　You're done! !