java 获取json字符串中key对应的值

本文为转载，原文为：https://blog.csdn.net/qq_37129976/article/details/80820539

用到了Gson的JsonParser

maven项目引入

        com.google.code.gson
	gson
	2.8.3

也可以直接去这个网址下载jar包 https://mvnrepository.com/artifact/com.google.code.gson/gson

我们来解析下面这个json字符串

Java代码

import com.google.gson.JsonObject;
import com.google.gson.JsonParser;
 
 
public class Test {
	public static void main(String[] args) {
		String resultStr = "{\"status\": 0,\"message\": \"query ok\","+
				"\"result\": {\"address\": \"北京市海淀区镜桥\","+
				"\"address_component\": {\"nation\": \"中国\",\"province\": \"北京市\","+
				"\"city\": \"北京市\",\"district\": \"海淀区\","+
			"\"street\": \"镜桥\",\"street_number\": \"镜桥\"}}}";
		
		JsonParser jp = new JsonParser();
		//将json字符串转化成json对象
            JsonObject jo = jp.parse(resultStr).getAsJsonObject();
            //获取message对应的值
            String message = jo.get("message").getAsString();
            System.out.println("message：" + message);
            //获取address对应的值
            String address = jo.get("result").getAsJsonObject().get("address").getAsString();
            System.out.println("address：" + address);
            //获取city对应的值
            String nation = jo.get("result").getAsJsonObject().get("address_component")
        						.getAsJsonObject().get("nation").getAsString();
            System.out.println("nation：" + nation);
	}
}