fastjson - 之常见的数据类型与json的相互转换

最新推荐文章于 2025-06-19 09:27:25 发布

brv601

最新推荐文章于 2025-06-19 09:27:25 发布

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本文展示了如何使用Java的FastJson库将数组、对象、集合和映射等转换为JSON字符串，并实现从JSON字符串反序列化回原始对象的过程。包括数组转JSON、JSON转数组、对象转JSON、JSON转对象、集合转JSON、JSON转集合和映射转JSON等操作。

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public class FastJsonTest1  
{  
  
  /** 
   * 数组转json格式字符串 
   */  
  public void array2Json(){  
    String[] arr = {"bill","green","maks","jim"};  
    String jsonText = JSON.toJSONString(arr, true);  
    System.out.println("array2Json()方法：jsonText=="+jsonText);  
    // 输出结果：jsonText==["bill","green","maks","jim"]  
  }  
  
  /** 
   * json格式字符串转数组 
   */  
  public void json2Array(){  
    String jsonText = "[\"bill\",\"green\",\"maks\",\"jim\"]";  
    JSONArray jsonArr = JSON.parseArray(jsonText);  
    System.out.println("json2Array()方法：jsonArr=="+jsonArr);  
    // 输出结果：jsonArr==["bill","green","maks","jim"]  
  }  
    
  /** 
   * 数组转json格式字符串 
   */  
  public void array2Json2(){  
    User user1 = new User("P001","TOM",16);  
    User user2 = new User("P002","JACKSON",21);  
    User user3 = new User("P003","MARTIN",20);  
    User[] userArr = {user1,user2,user3};  
    String jsonText = JSON.toJSONString(userArr, true);  
    System.out.println("array2Json2()方法：jsonText=="+jsonText);  
    //输出结果：jsonText==[{"age":16,"id":"P001","name":"TOM"},{"age":21,"id":"P002","name":"JACKSON"},{"age":20,"id":"P003","name":"MARTIN"}]  
  }  
    
  /** 
   * json格式字符串转数组 
   */  
  public void json2Array2(){  
    String jsonText = "[{\"age\":16,\"id\":\"P001\",\"name\":\"TOM\"},{\"age\":21,\"id\":\"P002\",\"name\":\"JACKSON\"},{\"age\":20,\"id\":\"P003\",\"name\":\"MARTIN\"}]";  
    JSONArray jsonArr = JSON.parseArray(jsonText);  
    System.out.println("json2Array2()方法：jsonArr=="+jsonArr);  
    // 输出结果：jsonArr==[{"age":16,"id":"P001","name":"TOM"},{"age":21,"id":"P002","name":"JACKSON"},{"age":20,"id":"P003","name":"MARTIN"}]  
  }  
    
  /** 
   * list集合转json格式字符串 
   */  
  public void list2Json(){  
    List list = new ArrayList();  
    User user1 = new User("L001","TOM",16);  
    list.add(user1);  
    User user2 = new User("L002","JACKSON",21);  
    list.add(user2);  
    User user3 = new User("L003","MARTIN",20);  
    list.add(user3);  
    String jsonText = JSON.toJSONString(list, true);  
    System.out.println("list2Json()方法：jsonText=="+jsonText);  
    //输出结果：jsonText==[{"age":16,"id":"L001","name":"TOM"},{"age":21,"id":"L002","name":"JACKSON"},{"age":20,"id":"L003","name":"MARTIN"}]  
  }  
    
  /** 
   * list集合转json格式字符串 
   */  
  public void list2Json2(){  
    List list = new ArrayList();  
    Address address1 = new Address("广东省","深圳市","科苑南路","580053");  
    User user1 = new User("L001","TOM",16,address1);  
    list.add(user1);  
    Address address2 = new Address("江西省","南昌市","阳明路","330004");  
    User user2 = new User("L002","JACKSON",21,address2);  
    list.add(user2);  
    Address address3 = new Address("陕西省","西安市","长安南路","710114");  
    User user3 = new User("L003","MARTIN",20,address3);  
    list.add(user3);  
    String jsonText = JSON.toJSONString(list, true);  
    System.out.println("list2Json2()方法：jsonText=="+jsonText);  
    //输出结果：jsonText==[{"address":{"city":"深圳市","post":"580053","province":"广东省","street":"科苑南路"},"age":16,"id":"L001","name":"TOM"},{"address":{"city":"南昌市","post":"330004","province":"江西省","street":"阳明路"},"age":21,"id":"L002","name":"JACKSON"},{"address":{"city":"西安市","post":"710114","province":"陕西省","street":"长安南路"},"age":20,"id":"L003","name":"MARTIN"}]  
  }  
  
  /** 
   * map转json格式字符串 
   */  
  public void map2Json(){  
    Map map = new HashMap();  
    Address address1 = new Address("广东省","深圳市","科苑南路","580053");  
    map.put("address1", address1);  
    Address address2 = new Address("江西省","南昌市","阳明路","330004");  
    map.put("address2", address2);  
    Address address3 = new Address("陕西省","西安市","长安南路","710114");  
    map.put("address3", address3);  
    String jsonText = JSON.toJSONString(map, true);  
    System.out.println("map2Json()方法：jsonText=="+jsonText);  
    //输出结果：jsonText=={"address1":{"city":"深圳市","post":"580053","province":"广东省","street":"科苑南路"},"address2":{"city":"南昌市","post":"330004","province":"江西省","street":"阳明路"},"address3":{"city":"西安市","post":"710114","province":"陕西省","street":"长安南路"}}  
  }  
    
}