JAVA-Gson-格式化输出json字符串

短命女 2022-05-16 09:46 462阅读 0赞

**使用Gson格式化输出json字符串**  
**POM**

<dependency>
        <groupId>com.google.code.gson</groupId>
        <artifactId>gson</artifactId>
        <version>2.8.5</version>
    </dependency>

**GsonTest**

import com.google.gson.*;
    
    /**
     * 格式化json字符串
     * @author wzx
     * @time 2018/8/19
     */
    public class GsonTest { 
    
        public static void main(String[] args) { 
            String compactJson = "{ \"playerID\":1234,\"name\":\"Test\",\"itemList\":[{ \"itemID\":1,\"name\":\"Axe\",\"atk\":12,\"def\":0},{ \"itemID\":2,\"name\":\"Sword\",\"atk\":5,\"def\":5},{ \"itemID\":3,\"name\":\"Shield\",\"atk\":0,\"def\":10}]}";
            String prettyJson = toPrettyFormat(compactJson);
            System.out.println("compactJson:");
            System.out.println(compactJson);
            System.out.println("prettyJson:");
            System.out.println(prettyJson);
        }
    
        public static String toPrettyFormat(String json) { 
            JsonParser jsonParser = new JsonParser();
            JsonObject jsonObject = jsonParser.parse(json).getAsJsonObject();
            Gson gson = new GsonBuilder().setPrettyPrinting().create();
            return gson.toJson(jsonObject);
        }
    }

输出结果：

compactJson:
    {
       "playerID":1234,"name":"Test","itemList":[{
       "itemID":1,"name":"Axe","atk":12,"def":0},{
       "itemID":2,"name":"Sword","atk":5,"def":5},{
       "itemID":3,"name":"Shield","atk":0,"def":10}]}
    prettyJson:
    {
      "playerID": 1234,
      "name": "Test",
      "itemList": [
        {
          "itemID": 1,
          "name": "Axe",
          "atk": 12,
          "def": 0
        },
        {
          "itemID": 2,
          "name": "Sword",
          "atk": 5,
          "def": 5
        },
        {
          "itemID": 3,
          "name": "Shield",
          "atk": 0,
          "def": 10
        }
      ]
    }