How to convert java objects and json back and forth

1. The difference between JSON array and object

JSONArray is to convert the data into array form:

strArray:[{“address”:”北京市西城区”,”age”:”23”,”name”:”JSON”}]

When using it, you need to read the data in json in array mode, strArray[0].address;

JSONObject is to convert the data into a object form:

strJson:{“address”:”北京市西城区”,”age”:”23”,”name”:”JSON”}

When using, directly use the object method to read the data in json, strArray.address;

2. Convert the object to JSON

First convert the java object Convert to json object, after converting json object to json string

   //1、使用JSONObject
   JSONObject json = JSONObject.fromObject(stu);
   //2、使用JSONArray
   JSONArray array=JSONArray.fromObject(stu);   
   String strJson=json.toString();
   String strArray=array.toString();

3. Convert json string to java object

Also first convert json string to json object, and then convert the json object into a java object, as shown below.

JSONObject obj = new JSONObject().fromObject(jsonStr);//将json字符串转换为json对象

Convert json object to java object

Person jb = (Person)JSONObject.toBean(obj,Person.class);//将建json对象转换为Person对象

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