fastjson的常用方法

日落尤其浪漫,人间皆是浪漫

json常用的工具有很多种,今天带来的是fastjson,废话少说上代码,首先引用一下jar

com.alibaba
fastjson
1.2.79

public class fastjsonTest {
    public static void main(String[] args) {
        jlkJson();
        jlkJsonArray();
    }

    public static void jlkJson() {
        String myJsonObj = """
                {
                    "name":"jlk",
                    "age":21,
                    "sites": {
                        "qq":"3417571131@qq.com",
                        "wx":"721520",
                        "hobby":"看美女"
                    }
                }""";
        ////将json字符串转换成jsonObject对象
        JSONObject jsonObject = JSON.parseObject(myJsonObj);
        //
        String name = jsonObject.getString("name");
        System.out.println("name:" + name); //jlk
        Integer age = jsonObject.getInteger("age");
        System.out.println("age:" + age); //21
        String qq = jsonObject.getJSONObject("sites").getString("qq");
        System.out.println("qq:" + qq);
    }

    public static void jlkJsonArray() {
        String myJsonObj2 = """
                {
                    "name":"网站",
                    "num":3,
                    "sites": [
                        { "name":"Google", "info":[ "Android", "Google 搜索", "Google 翻译" ] },
                        { "name":"Runoob", "info":[ "菜鸟教程", "菜鸟工具", "菜鸟微信" ] },
                        { "name":"Taobao", "info":[ "淘宝", "网购" ] }
                    ]
                }""";
        JSONObject jsonObject = JSON.parseObject(myJsonObj2);
        String string = jsonObject.getJSONArray("sites").getJSONObject(0).getJSONArray("info").getString(1);
        System.out.println("String:" + string);
    }

    /**
     * 手动添加对象到一个JSONObject
     */
    private static void writeStrToJSONObject() {
        JSONObject jsonObject = new JSONObject();
        jsonObject.put("name", "tom");
        jsonObject.put("age", 20);

        JSONArray jsonArray = new JSONArray();
        JSONObject jsonArrayObject1 = new JSONObject();
        jsonArrayObject1.put("name", "alibaba");
        jsonArrayObject1.put("info", "www.alibaba.com");
        JSONObject jsonArrayObject2 = new JSONObject();
        jsonArrayObject2.put("name", "baidu");
        jsonArrayObject2.put("info", "www.baidu.com");

        jsonArray.add(jsonArrayObject1);
        jsonArray.add(jsonArrayObject2);

        jsonObject.put("sites", jsonArray);

        System.out.println(jsonObject);
    }

    /**
     * 将字符串转为JSONArray
     */
    private static void strToJsonArray() {
        String arrayStr = "[\n" +
                "        {\n" +
                "            \"name\":\"alibaba\",\n" +
                "            \"info\":\"www.alibaba.com\"\n" +
                "        },\n" +
                "        {\n" +
                "            \"name\":\"baidu\",\n" +
                "            \"info\":\"www.baidu.com\"\n" +
                "        }\n" +
                "    ]";

        JSONArray array = JSON.parseArray(arrayStr);
        System.out.println(array);
    }

    /**
     * 依次取出JSONArray中的值
     */
    private static void getJsonArrayItem(JSONArray array) {
        for (Object o : array) {
            System.out.println(o);
        }
    }
}