阿里无脑JSON和对象转换 使用FastJson对JSON字符串、JSON对象及JavaBean之间的相互转换

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使用FastJson对JSON字符串、JSON对象及JavaBean之间的相互转换

2018年06月28日 15:33:41 xuforeverlove 阅读数：4001 更多

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            <p><strong>maven依赖包：</strong></p>

<!-- https://mvnrepository.com/artifact/com.alibaba/fastjson -->
<dependency>
    <groupId>com.alibaba</groupId>
    <artifactId>fastjson</artifactId>
    <version>1.2.47</version>
</dependency>

一、FastJson是用于java后台处理json格式数据的一个工具包，包括“序列化”和“反序列化”两部分，它具备如下特征：

    （1）速度最快，测试表明，fastjson具有极快的性能，超越任其他的java json parser。
    （2）功能强大，完全支持java bean、集合、Map、日期、Enum，支持范型，支持自省。
    （3）无依赖，能够直接运行在Java SE 5.0以上版本

二、FastJson对于json格式字符串的解析主要用到了一下三个类：

    （1）JSON：fastJson的解析器，用于JSON格式字符串与JSON对象及javaBean之间的转换。
    （2）JSONObject：fastJson提供的json对象。
    （3）JSONArray：fastJson提供json数组对象。

三、测试所需的实体类

  
  
package com.xxx.controller;

import java.io.Serializable;
public class Data implements Serializable {
private static final long serialVersionUID = - 6957361951748382519L;
private String id;
private String suborderNo;
private String organUnitType;
private String action;
private String parent;
private String organUnitFullName;
private Long ordinal;
get、set方法省略。。。
}
  
  

  
  
package com.xxx.controller;

import java.io.Serializable;
import java.util.ArrayList;
import java.util.List;

public class Error implements Serializable {

private static final long serialVersionUID = - 432908543160176349L;

private String code;
private String message;
private String success;
private List<Data> data = new ArrayList<>();
get、set方法省略。。。
}
  
  

四、JSON格式字符串、JSON对象及JavaBean之间的相互转换

    （1）java对象转json字符串

  
  
//java对象转json字符串
public static void beanTojson() {
Data data = new Data();
data.setAction( "add");
data.setId( "1");
data.setOrdinal( 8L);
data.setOrganUnitFullName( "testJSON");
data.setParent( "0");
data.setSuborderNo( "58961");

String s = JSON.toJSONString(data);
System.out.println( "toJsonString()方法：s=" + s);
//输出结果{"action":"add","id":"1","ordinal":8,"organUnitFullName":"testJSON","parent":"0","suborderNo":"58961"}
}
  
  

   （2）A.json字符串转json对象

  
  
//json字符串转json对象
public static void jsonToJsonBean() {
String s = "{\"action\":\"add\",\"id\":\"1\",\"ordinal\":8,\"organUnitFullName\":\"testJSON\",\"parent\":\"0\",\"suborderNo\":\"58961\"}";

JSONObject jsonObject = JSON.parseObject(s);
String action = jsonObject.getString( "action");
String id = jsonObject.getString( "id");
System.out.println( "action ="+action); //add
System.out.println( "id ="+id); //1
System.out.println( "jsonObject ="+jsonObject);
//action =add
//id =1
//jsonObject ={"parent":"0","organUnitFullName":"testJSON","action":"add","id":"1","suborderNo":"58961","ordinal":8}
}
  
  

       B.复杂json格式字符串与JSONObject之间的转换

  
  
public static void jsonToBean() {
String str = "{\"meta\":{\"code\":\"0\",\"message\":\"同步成功!\"},\"data\":{\"orderno\":\"U_2018062790915774\",\"suborderno\":\"SUB_2018062797348039\",\"type\":\"organunit\",\"result\":{\"organunit\":{\"totalCount\":2,\"successCount\":0,\"failCount\":2,\"errors\":[{\"code\":\"UUM70004\",\"message\":\"组织单元名称不能为空\",\"data\":{\"id\":\"254\",\"suborderNo\":\"SUB_2018062797348039\",\"organUnitType\":\"部门\",\"action\":\"add\",\"parent\":\"10000\",\"ordinal\":0,\"organUnitFullName\":\"组织单元全称\"},\"success\":false},{\"code\":\"UUM70004\",\"message\":\"组织单元名称不能为空\",\"data\":{\"id\":\"255\",\"suborderNo\":\"SUB_2018062797348039\",\"organUnitType\":\"部门\",\"action\":\"add\",\"parent\":\"10000\",\"ordinal\":0,\"organUnitFullName\":\"组织单元全称\"},\"success\":false}]},\"role\":{\"totalCount\":0,\"successCount\":0,\"failCount\":0,\"errors\":[]},\"user\":{\"totalCount\":0,\"successCount\":0,\"failCount\":0,\"errors\":[]}}}}";
JSONObject jsonObject = JSON.parseObject(str);
JSONObject data = jsonObject.getJSONObject( "data");
JSONObject result = data.getJSONObject( "result");

String organunit1 = result.getString( "organunit");
System.out.println(organunit1);
JSONObject organunit = result.getJSONObject( "organunit");

JSONArray errors2 = organunit.getJSONArray( "errors");

List<Error> error = JSON.parseObject(errors2.toJSONString(), new TypeReference<List<Error>>() {
});
}
  
  

（3）A. json字符串转java简单对象

  
  
//json字符串转java简单对象
public static void jsonStrToJavaBean() {
String s = "{\"action\":\"add\",\"id\":\"1\",\"ordinal\":8,\"organUnitFullName\":\"testJSON\",\"parent\":\"0\",\"suborderNo\":\"58961\"}";
Data data = JSON.parseObject(s, Data.class);
System.out.println( "data对象"+data.toString());
System.out.println( "action="+data.getAction()+ "---id="+data.getId());
//data对象Data{id='1', suborderNo='58961', organUnitType='null', action='add', parent='0', organUnitFullName='testJSON', ordinal=8}
//action=add---id=1

/**
* 另一种方式转对象
*/
Data dd = JSON.parseObject(s, new TypeReference<Data>() {});
System.out.println( "另一种方式获取data对象"+dd.toString());
System.out.println( "另一种方式获取="+dd.getAction()+ "---id="+dd.getId());
//另一种方式获取data对象Data{id='1', suborderNo='58961', organUnitType='null', action='add', parent='0', organUnitFullName='testJSON', ordinal=8}
//另一种方式获取=add---id=1
}
  
  

      B.json字符串  数组类型与java对象的转换

测试json字符串

{"errors":[{"code":"UUM70004","message":"组织单元名称不能为空","data":{"id":"254","suborderNo":"SUB_2018062797348039","organUnitType":"部门","action":"add","parent":"10000","ordinal":0,"organUnitFullName":"组织单元全称"},"success":false},{"code":"UUM70004","message":"组织单元名称不能为空","data":{"id":"255","suborderNo":"SUB_2018062797348039","organUnitType":"部门","action":"add","parent":"10000","ordinal":0,"organUnitFullName":"组织单元全称"},"success":false}]}
  
  

  
  
//json字符串--数组型与JSONArray对象之间的转换
public static void jsonStrToJSONArray() {
String str = "{\"errors\":[{\"code\":\"UUM70004\",\"message\":\"组织单元名称不能为空\",\"data\":{\"id\":\"254\",\"suborderNo\":\"SUB_2018062797348039\",\"organUnitType\":\"部门\",\"action\":\"add\",\"parent\":\"10000\",\"ordinal\":0,\"organUnitFullName\":\"组织单元全称\"},\"success\":false},{\"code\":\"UUM70004\",\"message\":\"组织单元名称不能为空\",\"data\":{\"id\":\"255\",\"suborderNo\":\"SUB_2018062797348039\",\"organUnitType\":\"部门\",\"action\":\"add\",\"parent\":\"10000\",\"ordinal\":0,\"organUnitFullName\":\"组织单元全称\"},\"success\":false}]}";
JSONObject jsonObject = JSON.parseObject(str);
JSONArray error = jsonObject.getJSONArray( "errors");
List<Error> errors = JSON.parseObject(error.toJSONString(), new TypeReference<List<Error>>() {
});
for (Error e: errors) {
//Error的属性
System.out.println( "Error属性="+e.getSuccess());
System.out.println( "Error属性="+e.getCode());
System.out.println( "Error属性="+e.getMessage());
//Error集合属性
List<Data> datas = e.getData();
for (Data d: datas) {
System.out.println( "data对象属性="+d.getId());
System.out.println( "data对象属性="+d.getAction());
System.out.println( "data对象属性="+d.getSuborderNo());
}
}
//Error属性=false
//Error属性=UUM70004
//Error属性=组织单元名称不能为空
//data对象属性=254
//data对象属性=add
//data对象属性=SUB_2018062797348039

//Error属性=false
//Error属性=UUM70004
//Error属性=组织单元名称不能为空
//data对象属性=255
//data对象属性=add
//data对象属性=SUB_2018062797348039
}
  
  

     C.json字符串  第二种方法-->数组类型与java对象的转换

  
  
//第二种方法：json字符串--数组型与JSONArray对象之间的转换
@Test
public void jsonStrToJSONArray2() {
String str = "{\"errors\":[{\"code\":\"UUM70004\",\"message\":\"组织单元名称不能为空\",\"data\":{\"id\":\"254\",\"suborderNo\":\"SUB_2018062797348039\",\"organUnitType\":\"部门\",\"action\":\"add\",\"parent\":\"10000\",\"ordinal\":0,\"organUnitFullName\":\"组织单元全称\"},\"success\":false},{\"code\":\"UUM70004\",\"message\":\"组织单元名称不能为空\",\"data\":{\"id\":\"255\",\"suborderNo\":\"SUB_2018062797348039\",\"organUnitType\":\"部门\",\"action\":\"add\",\"parent\":\"10000\",\"ordinal\":0,\"organUnitFullName\":\"组织单元全称\"},\"success\":false}]}";
//获取jsonobject对象
JSONObject jsonObject = JSON.parseObject(str);
//把对象转换成jsonArray数组
JSONArray error = jsonObject.getJSONArray( "errors");
//error==>[{"code":"UUM70004","message":"组织单元名称不能为空","data":{"id":"254","suborderNo":"SUB_2018062797348039","organUnitType":"部门","action":"add","parent":"10000","ordinal":0,"organUnitFullName":"组织单元全称"},"success":false},{"code":"UUM70004","message":"组织单元名称不能为空","data":{"id":"255","suborderNo":"SUB_2018062797348039","organUnitType":"部门","action":"add","parent":"10000","ordinal":0,"organUnitFullName":"组织单元全称"},"success":false}]
//将数组转换成字符串
String jsonString = JSONObject.toJSONString(error); //将array数组转换成字符串
//将字符串转成list集合
List<Error> errors = JSONObject.parseArray(jsonString, Error.class); //把字符串转换成集合
for (Error e: errors) {
//Error的属性
System.out.println( "另一种数组转换Error属性="+e.getSuccess());
System.out.println( "另一种数组转换Error属性="+e.getCode());
System.out.println( "另一种数组转换Error属性="+e.getMessage());
//Error集合属性
List<Data> datas = e.getData();
for (Data d: datas) {
System.out.println( "另一种数组转换data对象属性="+d.getId());
System.out.println( "另一种数组转换data对象属性="+d.getAction());
System.out.println( "另一种数组转换data对象属性="+d.getSuborderNo());
}
}
//另一种数组转换Error属性=false
//另一种数组转换Error属性=UUM70004
//另一种数组转换Error属性=组织单元名称不能为空
//另一种数组转换data对象属性=254
//另一种数组转换data对象属性=add
//另一种数组转换data对象属性=SUB_2018062797348039

//另一种数组转换Error属性=false
//另一种数组转换Error属性=UUM70004
//另一种数组转换Error属性=组织单元名称不能为空
//另一种数组转换data对象属性=255
//另一种数组转换data对象属性=add
//另一种数组转换data对象属性=SUB_2018062797348039
}
  
  

（4）java对象转json对象

  
  
//javabean转json对象
public static void jsonBenToJsonObject() {
Data data = new Data();
data.setAction( "add");
data.setId( "1");
data.setOrdinal( 8L);
data.setOrganUnitFullName( "testJSON");
data.setParent( "0");
data.setSuborderNo( "58961");
JSONObject jsonObj = (JSONObject) JSON.toJSON(data);
JSON json = (JSON) JSON.toJSON(data);
System.out.println( "jsonObj"+jsonObj);
System.out.println( "json对象"+json);
//jsonObj{"parent":"0","organUnitFullName":"testJSON","action":"add","id":"1","suborderNo":"58961","ordinal":8}
//json对象{"parent":"0","organUnitFullName":"testJSON","action":"add","id":"1","suborderNo":"58961","ordinal":8}
}
  
  

五、后记

（1）对于JSON对象与JSON格式字符串的转换可以直接用 toJSONString()这个方法。
（2）javaBean与JSON格式字符串之间的转换要用到：JSON.toJSONString(obj);
（3）javaBean与json对象间的转换使用：JSON.toJSON(obj)，然后使用强制类型转换，JSONObject或者JSONArray。

六、最后，欢迎大家关注【码农新锐】公众号，加入我们一起来进阶Java。

                                        

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利用fastjson进行json字符串与对象互转 - 无远弗届

package demo;public class Person { private String name; private int age; public Person()...

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						<span class="desc oneline">ali  fastjson   json转换 

import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.JSONObject;
j…

来自： 林波的博客

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						<span class="desc oneline">转自&nbsp;http://www.cnblogs.com/cdf-opensource-007/p/7106018.html

fastJson对于json格式字符串的解析主要用到了…

来自： banqgg的博客

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						<span class="desc oneline">使用fastjson进行自定义类的列表和字符串转换

  1.环境
  jdk1.8,fastjson

  2.pom.xml…

来自： neutron117的博客

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						<span class="desc oneline">fastJSON使用（二）——json转换成对象

下面介绍一下利用fastJSON把json串转换成对象
首先需要引入fastJSON的bao

        com.alibaba

…

来自： 止水的专栏

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						<span class="desc oneline">本文主要示例两部分内容：

JavaBean、List、Map、复杂集合 转换成 json字符串；
json字符串 转换成 JavaBean、List、Map、复杂集合；

定义POJO：

…

来自： SilenceCarrot的专栏

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						<span class="desc oneline">/* 

• 文 件 名: FastJsonTest.java

• 版 权: Newegg Technologies Co., Ltd. Copyright YYYY-YYYY, Al…
  
  来自： 有 prepare , No out
  

  
  
  

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   					<span class="desc oneline">首先我的字符串是 
  

String a = “{F0=0220&F25=00&F3=200000}”;
2.如果直接使用这个字符串，JSON.parseObject()方法不能解析成功。
3.经过研…

来自： ZJC的博客

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					<a href="https://blog.csdn.net/w1lgy/article/details/79666916" target="_blank" title="使用FastJson对json格式字符串、json对象以及javabean直接的相互转换 - w1lgy的博客">
						<span class="desc oneline">一、fastJson对于json格式字符串的解析主要用到了一下三个类：

JSON：fastJson的解析器，用于JSON格式字符串与JSON对象及javaBean之间的转换。
JSONObject…

来自： w1lgy的博客

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					<span class="date hover-show">01-29</span>
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					<a href="https://blog.csdn.net/weixin_39072332/article/details/79195708" target="_blank" title="JSON字符串与JSON对象之间的相互转换 - 南乔几经秋、的博客">
						<span class="desc oneline">JSON字符串-----&amp;amp;gt;JSON对象

1、 var obj = eval( ’ ( ’ + str + ’ ) ’ ) ;       // js自带的eval()方法

 
…

来自： 南乔几经秋、的博客

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						<span class="desc oneline">package com.cmsz.rc.util;import java.io.IOException;import com.fasterxml.jackson.core.JsonParseExcep...</span>
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                    						<span class="blog_title_box oneline"><a target="_blank" href="https://blog.csdn.net/zhanlai_wei">来自：	<span class="blog_title"> zhanlai_wei的博客</span></a></span>
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					<a href="https://blog.csdn.net/moxiaoya1314/article/details/80430713" target="_blank" title="js  json字符串与json对象互相转换 - Wisdom—Yoga—TaciturnKnight（WYT）">
						<span class="desc oneline">一、JSON字符串转换为JSON对象

//由JSON字符串转换为JSON对象

var obj = eval(‘(’ + str + ‘)’);

或者

var obj = str.parseJS…

来自： Wisdom—Yoga—TaciturnKnight（WYT）

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						1.4万</span>
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					<a href="https://blog.csdn.net/changjh1/article/details/70210646" target="_blank" title="使用FastJSON，将对象或数组和JSON串互转 - changjh1的博客">
						<span class="desc oneline">Fastjson，是阿里巴巴提供的一个Java语言编写的高性能功能完善的JSON库。

其开源的下载网址为：https://github.com/alibaba/fastjson。

示例代码如下…

来自： changjh1的博客

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					<em>fastjson</em>把<em>javaBean</em>转为json时，如果属性里有开头大写的 - forLove				</h4>
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						<span class="desc oneline">如图所示： 

这种情况如果转为String s = JSON.toJSONString(model);
那么得到的字符串就会是{“oP_CODE”:“OP_REQ_USER_LOGIN”,"st…

来自： forLove

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						<span class="desc oneline">fastjson官方文档

1.创建实体类Teacher.java

package com.imooc.sell.json;

import java.util.List;

public …

来自： a1032818891的博客

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						<span class="desc oneline">一 、各个JSON技术的简介和优劣

1.json-lib
json-lib最开始的也是应用最广泛的json解析工具，json-lib 不好的地方确实是依赖于很多第三方包，
包括commons-b…

来自： xx123698的专栏

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						<span class="desc oneline">常用函数

//将JavaBean序列化为JSON文本(常用)
public static final String toJSONString(Object object);

//把JS…

来自： dora_310的博客

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						<span class="desc oneline">最近在工作中用到了fastjson，遇到了一些坑，在这里总结一下。

简介

首先，介绍一下fastjson。fastjson是由alibaba开源的一套json处理器。与其他json处理器（如G…

来自： zgzczzw的专栏

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						<span class="desc oneline">1. 漏洞描述

漏洞简述： 2017年3月15日，fastjson官方主动爆出fastjson在1.2.24及之前版本存在远程代码执行高危安全漏洞。攻击者可以通过此漏洞远程执行恶意代码来入侵服务器。
…

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						<span class="desc oneline">转载地址：http://www.cnblogs.com/worfdream/articles/1956449.html

1，字符串转对象
方法一：var obj = eval(’(’ + str …

来自： waiwai4701

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						Alibaba Fastjson包。

对JSON格式字符串与JSON对象及javaBean之间做转换。

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			<h4 class="text-truncate oneline" style="width: 619px;">
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					<a href="https://blog.csdn.net/lh_guojw/article/details/74601477" target="_blank" title="json字符串和json对象之间的相互转换 - lh_guojw的博客">
						<span class="desc oneline">json字符串转换为json对象用JSON.parse()方法

jsonObject=JSON.parse(jsonString);
json对象转换为json字符串用JSON.stringify…

来自： lh_guojw的博客

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			<h4 class="text-truncate oneline" style="width: 627px;">
					<em>json对象</em>与<em>json字符串</em><em>之间</em>的<em>相互转换</em> - 刘秀的博客				</h4>
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					<span class="date hover-show">07-24</span>
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					<a href="https://blog.csdn.net/ls32140/article/details/76035924" target="_blank" title="json对象与json字符串之间的相互转换 - 刘秀的博客">
						<span class="desc oneline">1.对象-&gt;字符串

json.stringify();
2.字符串->对象

• json.parse()
  ie8有json对象，ie6,7没有json对象

•  eval(’(’+jsonS…
  
  来自： 刘秀的博客
  

  
  
  

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    				<span class="date hover-show">05-30</span>
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    					1.3万</span>
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    					<span class="desc oneline">1. 实体类或集合转JSON串String jsonString = JSONObject.toJSONString(实体类);
  

2.JSON串转JSONObjectJSONObject jsonOb…

来自： 诚实可靠小郎君的博客

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					<a href="https://blog.csdn.net/dushu990/article/details/80696472" target="_blank" title="使用fastjson.JSONObject来将字符串转换为JSONobject - dushu990的博客">
						<span class="desc oneline">

将String数据转换为json对象，可以使用fastjson.JSONObject的parseObject方法来进行转换

eg:

String str = &quot;{&amp;quo…

来自： dushu990的博客

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						<span class="desc oneline">也是很久没写博客了，觉得一个程序员要想进步，还是要多搞技术研究，写些博客分享技术，同时也能加深记忆，毕竟好记性不如烂笔头，好了鸡汤就不多说了。

最近写一些接口开发的小demo的时候，又接触了fastj…

来自： Wetsion的博客

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					<a href="https://blog.csdn.net/weixin_37623470/article/details/79030525" target="_blank" title="JSON转对象（实体类对象） - weixin_37623470的博客">
						<span class="desc oneline">1、创建对象

import java.io.Serializable;
import com.alibaba.fastjson.annotation.JSONField;
public class …

来自： weixin_37623470的博客

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					<span class="date hover-show">12-02</span>
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					<a href="https://blog.csdn.net/danfengw/article/details/53434247" target="_blank" title="Android fastjson对象转字符串 - danfengw的博客">
						<span class="desc oneline">使用Eclipse的话直接去github上面下载jar包https://github.com/alibaba/fastjson 

AS：compile ‘com.alibaba:fastjson:VE…

来自： danfengw的博客

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					<span class="date hover-show">10-25</span>
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						2.1万</span>
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					<a href="https://blog.csdn.net/xiaoke815/article/details/52920405" target="_blank" title="各个JSON技术的比较（Jackson，Gson，Fastjson）的对比 - xiaoke815的专栏">
						<span class="desc oneline">JSON技术的调研报告

一 、各个JSON技术的简介和优劣
1.json-lib
json-lib最开始的也是应用最广泛的json解析工具，json-lib 不好的地方确实是依赖于很多第三方…

来自： xiaoke815的专栏

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						<span class="desc oneline">注：使用jar包版本


    com.alibaba
    fastjson
    1.2.31</span>
					</a>
                    						<span class="blog_title_box oneline"><a target="_blank" href="https://blog.csdn.net/qq_31871785">来自：	<span class="blog_title"> 高興</span></a></span>
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import java.awt.print.Book;
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    fastjson
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最新评论

• mybatis批量新增、删除、查询...

  xuforeverlove：[reply]yyyyu3[/reply] 像你说的接收这样的形式 in('aa','bb','c...

• mybatis批量新增、删除、查询...

  xuforeverlove：[reply]yyyyu3[/reply] 一般用${}去接收

• mybatis批量新增、删除、查询...

  yyyyu3：where条件 id如果是字符串类型 内容，该如何批量更新 现在id是integer类型 当然可以...

• mysql数据库忘记密码时如何修改

  zhangman424：这个真的有用

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