json中的json.parseObject()方法和json.tojsonString()方法

JSON.parseObject，把字符串转化为json对象；JSON.toJSONString则是将json对象转为字符串。在前后台的传输过程中，Json字符串是相当常用的

首先用maven引入fastjson（pom.xml）

<dependency>
    <groupId>com.taobao.tddl</groupId>
    <artifactId>tddl-client</artifactId>
    <version>5.2.6</version>
    <exclusions>
        <exclusion>
            <groupId>com.alibaba</groupId>
            <artifactId>fastjson</artifactId>
        </exclusion>
    </exclusions>
</dependency>

---

---

package com.alibaba.logPlayBack.logHistory;

import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.JSONArray;
import com.alibaba.fastjson.JSONObject;

public class testEmpty {
    public static void main(String[] args) {

        JSONObject jo = new JSONObject();
        jo.put("a", "1");
        jo.put("b", "2");
        String json = jo.toJSONString();
        System.out.println("jo为==" + jo);
        System.out.println("json为==" + json);
        if (json instanceof String) {
            System.out.println("success");
        }


        System.out.println(JSON.parseObject("") + "====测试1===");
        System.out.println(JSON.parseObject(json) + "====测试2====");

        // 字符串 key value
        String str = "{\"appScene\":\"mobile_xx\",\"secondsEnd\":\"0\", " +
                "\"aiSdkInfo\":\"{\\\"machineType\\\":\\\"android\\\"}\",\"version\":\"8.6.3\"}";
        JSONObject js = JSON.parseObject(str);
        if (js instanceof JSONObject) {
            System.out.println("success");
        }
        System.out.println("js为==" + js);
        System.out.println(js.containsKey("appScene"));
        System.out.println(js.containsKey("machineType"));
        System.out.println(JSON.parseObject(js.getString("aiSdkInfo")).getString("machineType") + "====测试3====");
        System.out.println(JSON.parseObject(str).getJSONObject("aiSdkInfo").getString("machineType") + "====测试4====");
        System.out.println(JSON.parseObject(str).getString("secondsEnd") + "====测试5====");
        System.out.println(JSON.parseObject(str).getString("appScene") + "====测试6====");

        // 字符串 key value
        String result = "{\"success\":\"true\",\"returnAddress\":\"123\"}";
        //转换成object
        JSONObject jsonObject = JSON.parseObject(result);
        //获取object中returnAddress字段
        jsonObject.getString("returnAddress");
        System.out.println("returnAddress为==" + JSON.parseObject(result).getString("returnAddress"));

        // JSONObject
        String result1 = "{\"success\":\"true\",\"data\":{\"shop_uid\":\"123\"}}";
        JSONObject shop_user = JSON.parseObject(result1);
        JSON.parseObject(shop_user.getString("data")).getString("shop_uid");
        System.out.println("shop_uid为==" + JSON.parseObject(result1).getJSONObject("data").getString("shop_uid"));

        // JSONObject
        String result2 = "{\"success\":\"true\",\"data\":[{\"shop_uid\":456},{\"shop_name\":\"张三\"}]}";
        System.out.println("shop_uid为==" + JSON.parseObject(result2).getJSONArray("data").getJSONObject(0).getInteger("shop_uid"));
        System.out.println("{\"shop_uid\":456}为==" + JSON.parseObject(result2).getJSONArray("data").get(0));
        System.out.println("{\"shop_uid\":456}为==" + JSON.parseObject(result2).getJSONArray("data").getJSONObject(0));

        String ship = "[{\"shop_uid\":456},{\"shop_name\":\"张三\"}]";
        JSONArray detail = JSON.parseArray(ship);
        for (int i = 0; i < detail.size(); i++) {
            if (detail.get(i) != null || !detail.get(i).equals("")) {
                JSONObject detailChild = detail.getJSONObject(i);
                System.out.println("detailChild==" + detailChild);
            }

        }
    }
}

 

运行结果：

jo为=={"a":"1","b":"2"}
json为=={"a":"1","b":"2"}
success
null====测试1===
{"a":"1","b":"2"}====测试2====
success
js为=={"appScene":"mobile_xx","aiSdkInfo":"{\"machineType\":\"android\"}","secondsEnd":"0","version":"8.6.3"}
true
false
android====测试3====
android====测试4====
0====测试5====
mobile_xx====测试6====
returnAddress为==123
shop_uid为==123
shop_uid为==456
{"shop_uid":456}为=={"shop_uid":456}
{"shop_uid":456}为=={"shop_uid":456}
detailChild=={"shop_uid":456}
detailChild=={"shop_name":"张三"}

Process finished with exit code 0