@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  
     * @throws
     * @author lihaoyang
     * @date 2018年2月24日
     */
    @GetMapping("query")
    @JsonView(User.UserSimpleView.class)
    public List 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 users = new ArrayList();
        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_第1张图片

 

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