fastjson 实践_fastjson parsearray feature

强烈推荐 jackson, 这东西我是不用.

该笔记背景是因为女朋友要用.

pom 坐标

        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>fastjson</artifactId>
            <version>1.2.80</version>
        </dependency>

常用方法

序列化

com.alibaba.fastjson.JSON#toJSONString(java.lang.Object)

反序列化对象

• 数组

com.alibaba.fastjson.JSON#parseArray(java.lang.String, java.lang.Class<T>)

• 泛型

com.alibaba.fastjson.JSON#parseObject(java.lang.String,com.alibaba.fastjson.TypeReference<T>, com.alibaba.fastjson.parser.Feature...)

例子

import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.TypeReference;
 
import java.util.*;
import java.util.concurrent.ConcurrentHashMap;
 
public class FastjsonTest {
 
    static List<Student> getStudentList() {
        return Arrays.asList(new Student("小杜", 10),
                new Student("苧予", 99));
 
    }
 
    public static void main(String[] args) {
        List<Student> studentList = getStudentList();
        Map map = new HashMap();
        map.put("hi", studentList);
        String content = JSON.toJSONString(map);
        System.out.println("content:\n" + content);
 
 
        Map<String, List<Student>> map2 = JSON.parseObject(content,
                new TypeReference<ConcurrentHashMap<String, List<Student>>>() {
                });
        System.out.println(map2);
    }
}
/*
content:
{"hi":[{"age":10,"name":"小杜"},{"age":99,"name":"苧予"}]}
{hi=[Student{name='小杜', age=10}, Student{name='苧予', age=99}]}
 */

TreeNode模式

 JSONObject com.alibaba.fastjson.JSON#parseObject(java.lang.String)

得到 tree中的node.

com.alibaba.fastjson.JSONObject#getString(String key)

根据key拿value. 类似的还有 getInteger,getBoolean 等.