java生成json字符串的方法

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例1：将map对象添加一次元素（包括字符串对、数组），转换成json对象一次。

package com.json;

//这是使用org.json的程序：
import java.util.HashMap;
import java.util.Map;

import org.json.JSONException;
import org.json.JSONObject;

public class jsontest {

public static void main(String[] args) throws JSONException {
String json = "{'name':'reiz'}";
JSONObject jsonObj = new JSONObject(json);
String name = jsonObj.getString("name");

System.out.println(jsonObj);

jsonObj.put("initial", name.substring(0, 1).toUpperCase());

String[] likes = new String[] { "JavaScript", "Skiing", "Apple Pie" };
jsonObj.put("likes", likes);

System.out.println(jsonObj);

Map <String, String> ingredients = new HashMap <String, String>();
ingredients.put("apples", "3kg");
ingredients.put("sugar", "1kg");
ingredients.put("pastry", "2.4kg");
ingredients.put("bestEaten", "outdoors");
jsonObj.put("ingredients", ingredients);
System.out.println(jsonObj);


}
}

运行结果：

{"name":"reiz"}
{"initial":"R","likes":["JavaScript","Skiing","Apple Pie"],"name":"reiz"}
{"ingredients":{"apples":"3kg","pastry":"2.4kg","bestEaten":"outdoors","sugar":"1kg"},"initial":"R","likes":["JavaScript","Skiing","Apple Pie"],"name":"reiz"}

其次，例2：list转换成json的三种参数形式。例3：json转换成list和map。等问题
可以转到该博客进行观看 https://www.cnblogs.com/zhujiabin/p/5498555.html