（1）将 java 实体对象与json字符串互转

 public class Helloworld {
    private  void  jsonParseObject() throws  Exception  {
         String  student json s = "{\"name\":\"Lily\", \"age\":\"9\"}";
        StudentPo studentPo = JSON.parseObject(studentJsons, StudentPo.class);
        System.out.println("解析json字符串成java实体对象其属性age值：" + studentPo.getAge());

        String studentConvertJs = JSON.toJSONString(studentPo);
        System.out.println("把java实体对象转换成json字符串：" + studentConvertJs);
    }
public  static  void main(String[] args) throws Exception {
// 测试代码
new Helloworld().jsonParseObject();
}
}  

（2）java集合List转成json字符串 或 把json字符串集合转化成java集合对象

 public class Helloworld {
 private  void jsonParseObject() throws Exception {
        StudentPo studentPoV1 = new StudentPo();
        StudentPo studentPoV2 = new StudentPo();
        studentPoV1.setAge("1");
        studentPoV1.setName("n1");
        studentPoV2.setName("n2");
        studentPoV2.setAge("2");
        List<StudentPo> spoList = new ArrayList<StudentPo>();
        spoList.add(studentPoV1);
        spoList.add(studentPoV2);
        String listJson = JSONArray.toJSONString(spoList);
        System.out.println("java集合List转成json字符串："+ listJson);

        List<StudentPo> jsonConvertList = JSONArray.parseArray(listJson, StudentPo.class);
        System.out.println("把json字符串集合转化成java集合对象：" + jsonConvertList.get(0).getName());
    }
public static void main(String[] args) throws Exception {
// 测试代码
new Helloworld().jsonParseObject();
}
}