161.使用fastjson將json格式的數據轉化爲對象

時間 2019-11-07

原文原文鏈接

1. 導入fastjson的jar包

<dependency>
           <groupId>com.alibaba</groupId>
           <artifactId>fastjson</artifactId>
           <version>1.2.47</version>
           </dependency>

2. 經常使用幾種類型的json轉化爲對象

2.1 對象形式的json

   @RequestMapping("/EasyJsonToObject.action")
   public void EasyJsonToObject(){

       //(1) 建立一個對象並將給對象賦值而後使用fastjson轉化爲json類型的數據
           Student student = new Student();
                   student.setId(UUID.randomUUID().toString().replaceAll("-", ""));//生成id
                   student.setName("張三");
                   student.setPassword("122455");
           String studentJson = JSON.toJSONString(student);//將對象轉json
           System.out.println(studentJson);


       //（2）再將對象轉化爲
       Student changeStudent = JSON.parseObject(studentJson,Student.class);
       System.out.println(changeStudent);
   }

2.1.1 將對象轉化爲json

須要的實體類格式：json

轉換過程：數組

2.1.2 將json數據轉爲對象

2.2 將list對象轉爲json 而後將對象list數據

@RequestMapping("/listJsonToObject.action")
   public void listJsonToObject(){

       //(1) 建立一個對象並將給對象賦值而後使用fastjson轉化爲json類型的數據
           List<Student> list= new ArrayList<Student>();
               Student student = new Student();
                   student.setId(UUID.randomUUID().toString().replaceAll("-", ""));//生成id
                   student.setName("劉瑩");
                   student.setPassword("123456");
           Student student2 = new Student();
                   student2.setId(UUID.randomUUID().toString().replaceAll("-", ""));//生成id
                   student2.setName("張曉琪");
                   student2.setPassword("789456");
                   list.add(student);
                   list.add(student2);
           String studentJson = JSON.toJSONString(list);//將對象轉json
           System.out.println(studentJson);


       //（2）再將對象轉化爲
       List<Student> list2 = JSON.parseArray(studentJson,Student.class);
       System.out.println(list2);
   }

須要的實體類對象app

2.3 對象中含有對象轉化爲對象

   @RequestMapping("/mapListJsonToObject.action")
   public void mapListJsonToObject(){

       //(1) 建立一個對象並將給對象賦值而後使用fastjson轉化爲json類型的數據
       HashMap<String, Object> map = new HashMap<String,Object>();//用來裝數據

       Student student = new Student();
           student.setId(UUID.randomUUID().toString().replaceAll("-", ""));//生成id
           student.setName("劉思佳");
           student.setPassword("123456");

           map.put("code", "200");
           map.put("data", student);
       String studentJson = JSON.toJSONString(map);//將對象轉json
       System.out.println(studentJson);
       //（2）再將對象轉化爲
       Data data = JSON.parseObject(studentJson,Data.class);
       System.out.println(data);
   }

2.4 對象中含有list的json格式

   /**
   * 3.複雜json轉爲對象
   *    對象中包含數組的json
   * http://localhost:8080/mavenssm20180519//josnIncludeListJsonToObject.action
   * @Title: josnIncludeListJsonToObject
   * @Description:
   * @return void
   * @throws
   @date 2018年7月22日下午10:46:00
   */
   @RequestMapping("/josnIncludeListJsonToObject.action")
   public void josnIncludeListJsonToObject(){
       //(1) 建立一個對象並將給對象賦值而後使用fastjson轉化爲json類型的數據
       HashMap<String, Object> map = new HashMap<String,Object>();//用來裝數據

       List<Student> list= new ArrayList<Student>();
       Student student = new Student();
           student.setId(UUID.randomUUID().toString().replaceAll("-", ""));//生成id
           student.setName("劉思佳");
           student.setPassword("123456");
       Student student2 = new Student();
           student2.setId(UUID.randomUUID().toString().replaceAll("-", ""));//生成id
           student2.setName("陳曉瑩");
           student2.setPassword("789456");
       list.add(student);
       list.add(student2);
           map.put("code", "200");
           map.put("data", list);
           String studentJson = JSON.toJSONString(map);//將對象轉json
       System.out.println(studentJson);
       //（2）再將對象轉化爲
   Data data = JSON.parseObject(studentJson,Data.class);
       System.out.println(data);
   }

須要的實體類（****重要）dom

將maven