解析json字符串

解析json字符串有两种方式
1.使用谷歌的Gson,在maven项目的pom文件中导入包

    <!-- https://mvnrepository.com/artifact/com.google.code.gson/gson -->
    <dependency>
        <groupId>com.google.code.gson</groupId>
        <artifactId>gson</artifactId>
        <version>2.8.8</version>
    </dependency>

    
    import com.google.gson.Gson;
    import java.util.HashMap;
    public class Demo02Gson {
        public static void main(String[] args) {
            HashMap<String, String> map = new HashMap<String, String>();
            String  jsonStr=" {\"id\":\"1500100002\",\"name\":\"吕金鹏\",\"age\":24,\"gender\":\"男\",\"clazz\":\"文科六班\"}";
            System.out.println(jsonStr);
            //使用Gson解析JSON字符串
            //Gson gson = new Gson();
            // 把json解析为hashMap
            //HashMap hashMap = gson.fromJson(jsonStr, map.getClass());
            //System.out.println(hashMap.get("age"));

            // 将json解析成java对象
            //Gson gson = new Gson();
            //Student student = gson.fromJson(jsonStr, Student.class);
            //System.out.println(student);
            
            //将java对象解析成json
            Gson gson = new Gson();
            Student student = new Student("1001", "zs", 25, "男", "一班");
            String s = gson.toJson(student);
            System.out.println(s);
        }
    }

2.使用阿里的Fastjson,在maven项目的pom文件中导入包

    <!-- https://mvnrepository.com/artifact/com.alibaba/fastjson -->
    <dependency>
        <groupId>com.alibaba</groupId>
        <artifactId>fastjson</artifactId>
        <version>1.2.78</version>
    </dependency>
    

    import com.alibaba.fastjson.JSON;
    public class Demo03FastJson {
        public static void main(String[] args) {
            String  jsonStr=" {\"id\":\"1500100002\",\"name\":\"吕金鹏\",\"age\":24,\"gender\":\"男\",\"clazz\":\"文科六班\"}";
            //JSONObject jsonObject = JSON.parseObject(jsonStr);
            //Object id = jsonObject.get("id");
            //System.out.println(id);
            Student student = JSON.parseObject(jsonStr, Student.class);
            System.out.println(student.getName());

        }
    }