Java 使用Gson处理多层json格式的value和key值

json如下：

{"words_result":{"姓名":{"location":{"top":277,"left":618,"width":372,"height":164},"words":"张三"},"民族":{"location":{"top":568,"left":1262,"width":101,"height":126},"words":"汉"},"住址":{"location":{"top":1082,"left":552,"width":1392,"height":486},"words":"住址住址住址"},"公民身份号码":{"location":{"top":1733,"left":1105,"width":1749,"height":157},"words":"***************"},"出生":{"location":{"top":814,"left":561,"width":969,"height":132},"words":"********"},"性别":{"location":{"top":561,"left":580,"width":110,"height":129},"words":"男"}},"idcard_number_type":1,"words_result_num":6,"image_status":"normal","log_id":1453528763137919643}

这个json有很多层，使用一般方法不能获取想要的value值

JSONObject jsonObject = JSONObject.fromObject(result);
String value = jsonObject.getString("姓名");
System.out.println(value);

使用Gson来进行处理，

首先添加maven依赖

        <dependency>
            <groupId>com.google.code.gson</groupId>
            <artifactId>gson</artifactId>
            <version>2.8.2</version>
        </dependency>

添加包

import com.google.gson.JsonObject;
import com.google.gson.JsonParser;

方法

            JsonParser jp = new JsonParser();
            //将json字符串转化成json对象
            JsonObject jo = jp.parse(result).getAsJsonObject();
            //获取姓名对应的值
            String name = jo.get("words_result").getAsJsonObject()
                    .get("姓名").getAsJsonObject()
                    .get("words").getAsString();
            System.out.println("姓名：" + name);

            //获取性别对应值
            String sex = jo.get("words_result").getAsJsonObject()
                    .get("性别").getAsJsonObject()
                    .get("words").getAsString();
            System.out.println("性别：" + sex);

            //获取民族对应值
            String nation = jo.get("words_result").getAsJsonObject()
                    .get("民族").getAsJsonObject()
                    .get("words").getAsString();
            System.out.println("民族：" + nation);

            //获取住址对应值
            String address = jo.get("words_result").getAsJsonObject()
                    .get("住址").getAsJsonObject()
                    .get("words").getAsString();
            System.out.println("住址：" + address);

            //获取出生日期对应值
            String birth = jo.get("words_result").getAsJsonObject()
                    .get("出生").getAsJsonObject()
                    .get("words").getAsString();
            System.out.println("出生日期：" + birth);

            //获取身份证对应值
            String id = jo.get("words_result").getAsJsonObject()
                    .get("公民身份号码").getAsJsonObject()
                    .get("words").getAsString();
            System.out.println("姓名：" + id);

输出结果

参考：java 获取json字符串中key对应的值 - 小猫钓鱼吃鱼 - 博客园 (cnblogs.com)