9月30 json工具类

Posted 2021-01-09 lyon91

import java.util.List;

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

public class JsonUtils {

    /***
     * 将List对象序列化为JSON文本
     */
    public static String toJSONString(Object obj) {
        return JSON.toJSONString(obj);
    }
    
    /***
     * 将字符串转换为传入类型的List
     */
    public static <T> List<T> toList(String text, Class<T> clazz){
        return JSONArray.parseArray(text, clazz);
    }
    
    /***
     * 将字符串转换为传入类型的List
     */
    public static <T> Object toObj(String text, Class<T> clazz){
        return JSON.parseObject(text, clazz);
    }
}

 

测试

Student s = Student.getStu();
        
        // 将对象转成json字符串
        System.out.println(JsonUtils.toJSONString(s));
        
        // 将json字符串转成对象
        Object s2 = JsonUtils.toObj(JsonUtils.toJSONString(s), Student.class);
        System.out.println(s2.toString());
        
        // 将List 转成json字符串
        List<Student> list = new ArrayList<>();
        Student stu1 = Student.getStu();
        Student stu2 = Student.getStu();
        list.add(stu1);
        list.add(stu2);
        System.out.println(JsonUtils.toJSONString(list));
        
        // 将json字符串转成List
        List<Student> list2 = JsonUtils.toList(JsonUtils.toJSONString(list), Student.class);
        for (Student student : list2) {
            System.out.println(JsonUtils.toJSONString(student));
        }