json解析方式之Gson

第一种：解析json数组成java对象数组

1.json字符串

[
    {
        "address": "中国",
        "age": 30,
        "name": "小明",
        "sex": "boy"
    },
    {
        "address": "加拿大",
        "age": 20,
        "name": "小雨",
        "sex": "girl"
    }
]

2.java实体类

public class Bean {

    public String name;
    public int age;
    public String sex;
    public String address;
}

3.解析过程

 Gson gson = new Gson();//创建Gson对象
        JsonParser jsonParser = new JsonParser();
        JsonArray jsonElements = jsonParser.parse(strJson).getAsJsonArray();//获取JsonArray对象
        ArrayList<Bean> beans = new ArrayList<>();
        for (JsonElement bean : jsonElements) {
            Bean bean1 = gson.fromJson(bean, Bean.class);//解析
            beans.add(bean1);
        }

第二种：解析json字符串为Java对象
1.json字符串

 {
        "address": "加拿大",
        "age": 20,
        "name": "小雨",
        "sex": "girl"
    }

2.java实体类

public class Bean {

    public String name;
    public int age;
    public String sex;
    public String address;
}

3.解析过程

String json = "{\n" +
                "  \"rst\": 0,\n" +
                "  \"msg\": \"ok\",\n" +
                "  \"data\": {\n" +
                "    \"cookie\": \"JSESSIONID=abcntKeuJhop56LGykfdw\"\n" +
                "  }\n" +
                "}";
        JsonObject jsonObject = (JsonObject) new JsonParser().parse(json);
        System.out.println("rst:" + jsonObject.get("rst").getAsInt());
        System.out.println("msg:" + jsonObject.get("msg").getAsString());
        System.out.println("data:" + jsonObject.get("data").getAsJsonObject().get("cookie").getAsString());

第三种：直接获取json字符串属性

{"data":"hello"}

String radius = jsonObject.get("data").toString();