@JsonView注解的使用

看到一个新的注解以前没有用过,记录一下使用方法。

注意是:com.fasterxml.jackson.annotation.JsonView

@JsonView可以过滤pojo的属性,使Controller在返回json时候,pojo某些属性不返回,比如User的密码,一般是不返回的,就可以使用这个注解。

@JsonView使用方法:

  1,使用接口来声明多个视图

  2,在pojo的get方法上指定视图

  3,在Controller方法上指定视图

例子:条件查询时候不返回用户的密码,查看详情时候返回用户的密码

User:

package com.imooc.dto;

import com.fasterxml.jackson.annotation.JsonView;

public class User {

    public interface UserSimpleView {};
public interface UserDetailView extends UserSimpleView{}; //继承 private String username; private String password; //UserSimpleView视图有
@JsonView(UserSimpleView.class)
public String getUsername() {
return username;
} public void setUsername(String username) {
this.username = username;
}
@JsonView(UserDetailView.class)
public String getPassword() {
return password;
} public void setPassword(String password) {
this.password = password;
} @Override
public String toString() {
return "User [username=" + username + ", password=" + password + "]";
} }

Controller:

package com.imooc.web.controller;

import java.util.ArrayList;
import java.util.List; import org.springframework.data.domain.Pageable;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController; import com.fasterxml.jackson.annotation.JsonView;
import com.imooc.dto.User;
import com.imooc.dto.UserQueryCondition; @RestController
@RequestMapping("/user")
public class UserController { /**
* @Description: 条件查询
* @param @param condition
* @param @param pageable
* @param @return
* @return List<User>
* @throws
* @author lihaoyang
* @date 2018年2月24日
*/
@GetMapping("query")
@JsonView(User.UserSimpleView.class)
public List<User> query(
//@RequestParam(value="username",required=false,defaultValue="lhy") String username
UserQueryCondition condition , Pageable pageable){
// System.err.println(username);
System.err.println(condition.toString());
System.err.println(pageable.toString()); List<User> users = new ArrayList<User>();
users.add(new User());
users.add(new User());
users.add(new User());
return users;
} /**
* 详情
* @Description: TODO
* @param @param id
* @param @return
* @return User
* @throws
* @author lihaoyang
* @date 2018年2月24日
*/
@GetMapping("detail/{id:\\d+}") //{}里可以是正则,匹配数字
// @GetMapping("detail/{id}")
@JsonView(User.UserDetailView.class)
public User getInfo(@PathVariable(value="id",required=true) String id){
System.err.println(id);
User user = new User();
user.setUsername("tom");
return user;
} }

测试用例:

package com.imooc.web.controller;

import org.junit.Before;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.http.MediaType;
import org.springframework.test.context.junit4.SpringRunner;
import org.springframework.test.web.servlet.MockMvc;
import org.springframework.test.web.servlet.request.MockMvcRequestBuilders;
import org.springframework.test.web.servlet.result.MockMvcResultMatchers;
import org.springframework.test.web.servlet.setup.MockMvcBuilders;
import org.springframework.web.context.WebApplicationContext; @RunWith(SpringRunner.class)
@SpringBootTest
public class UserControllerTest { @Autowired
private WebApplicationContext webCtx; //伪造mvc
private MockMvc mockMvc; @Before
public void setup(){
mockMvc = MockMvcBuilders.webAppContextSetup(webCtx).build();
} /**
* 查询
*/
@Test
public void whenQuerySuccess() throws Exception{
String result = mockMvc.perform(MockMvcRequestBuilders.get("/user/query") //路径
.param("page", "10") //参数
.param("size", "12")
.param("sort", "age,desc")
.param("username", "xiaoming")
.param("age", "18")
.param("ageTo", "40")
.param("other", "otherProperty")
.contentType(MediaType.APPLICATION_JSON_UTF8))
.andExpect(MockMvcResultMatchers.status().isOk()) //状态码200
.andExpect(MockMvcResultMatchers.jsonPath("$.length()").value(3))//长度为3,具体查看github的jsonPath项目
.andReturn().getResponse().getContentAsString();
System.err.println(result);
} /**
* 详情
*/
@Test
public void whenGetInfoSuccess() throws Exception{
String result = mockMvc.perform(MockMvcRequestBuilders.get("/user/detail/1")
.contentType(MediaType.APPLICATION_JSON_UTF8))
.andExpect(MockMvcResultMatchers.status().isOk())
.andExpect(MockMvcResultMatchers.jsonPath("$.username").value("tom"))
.andReturn().getResponse().getContentAsString();
System.err.println(result);
} /**
* 详情失败
*/
@Test
public void whenGetInfoFail() throws Exception{
mockMvc.perform(MockMvcRequestBuilders.get("/user/detail/a") //匹配正则
.contentType(MediaType.APPLICATION_JSON_UTF8))
.andExpect(MockMvcResultMatchers.status().is4xxClientError()); } }

打印结果:使用UserDetailView视图的会把密码给打印出来

@JsonView注解的使用

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