fastjson生成和解析json数据，序列化和反序列化数据



下载地址：https://github.com/alibaba/fastjson/releases

一、阿里巴巴FastJson是一个Json处理工具包，包括“序列化”和“反序列化”两部分，它具备如下特征：
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。包括自称最快的JackJson；
功能强大，完全支持Java Bean、集合、Map、日期、Enum，支持范型，支持自省；无依赖，能够直接运行在Java SE 5.0以上版本；支持Android；开源 (Apache 2.0)

Fastjson API入口类是com.alibaba.fastjson.JSON，常用的序列化操作都可以在JSON类上的静态方法直接完成。

public<wbr></wbr>static<wbr></wbr>final<wbr></wbr>Object parse(String text);<wbr></wbr>//把JSON文本parse为JSONObject或者JSONArray<wbr></wbr>
public<wbr></wbr>static<wbr></wbr>final<wbr></wbr>JSONObject parseObject(String text)；<wbr></wbr>// 把JSON文本parse成JSONObject<wbr><wbr><wbr><wbr></wbr></wbr></wbr></wbr>
public<wbr></wbr>static<wbr></wbr>final<wbr></wbr>T parseObject(String text, Class clazz);<wbr></wbr>// 把JSON文本parse为JavaBean<wbr></wbr>
public<wbr></wbr>static<wbr></wbr>final<wbr></wbr>JSONArray parseArray(String text);<wbr></wbr>// 把JSON文本parse成JSONArray<wbr></wbr>
public<wbr></wbr>static<wbr></wbr>final<wbr></wbr>List parseArray(String text, Class clazz);<wbr></wbr>//把JSON文本parse成JavaBean集合<wbr></wbr>
public<wbr></wbr>static<wbr></wbr>final<wbr></wbr>String toJSONString(Object object);<wbr></wbr>// 将JavaBean序列化为JSON文本<wbr></wbr>
public<wbr></wbr>static<wbr></wbr>final<wbr></wbr>String toJSONString(Object object,<wbr></wbr>boolean<wbr></wbr>prettyFormat);<wbr></wbr>// 将JavaBean序列化为带格式的JSON文本<wbr></wbr>
public<wbr></wbr>static<wbr></wbr>final<wbr></wbr>Object toJSON(Object javaObject); 将JavaBean转换为JSONObject或者JSONArray。

二、FastJson解析JSON步骤
<wbr style=""><span style=""></span> <div style=""><wbr><wbr><wbr><wbr><wbr><span></span><span style=""><strong>A、服务器端将数据转换成json字符串</strong></span><br><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><span></span>首先、服务器端项目要导入阿里巴巴的fastjson的jar包至builtPath路径下（这些可以到fastjson官网下载：http://code.alibabatech.com/wiki/display/FastJSON/Home-zh<a target="_blank" href="http://json-lib.sourceforge.net/" style="color:rgb(82,102,115); text-decoration:none"></a>）</wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></div> <p><a target="_blank" href="http://photo.blog.sina.com.cn/showpic.html#blogid=7ffb8dd501013qas&amp;url=http://s14.sinaimg.cn/orignal/7ffb8dd5gcb63c625c27d" style=""></a><span style="">然后将数据转为json字符串，核心函数是：</span><br style=""><span style="">public static String createJsonString(Object value)</span><br style=""><span style=""></span><wbr style=""><span style=""></span><wbr style=""><span style=""></span><wbr style=""><span style=""><span></span>{</span><br style=""><span style=""></span><wbr style=""><span style=""></span><wbr style=""><span style=""></span><wbr style=""><span style=""><span></span></span><wbr style=""><span style=""></span><wbr style=""><span style=""></span><wbr style=""><span style=""><span></span>String alibabaJson = JSON.toJSONString(value);</span><br style=""><span style=""></span><wbr style=""><span style=""></span><wbr style=""><span style=""></span><wbr style=""><span style=""><span></span></span><wbr style=""><span style=""></span><wbr style=""><span style=""></span><wbr style=""><span style=""><span></span>return alibabaJson;</span><br style=""><span style=""></span><wbr style=""><span style=""></span><wbr style=""><span style=""></span><wbr style=""><span style=""><span></span>}</span><br style=""><strong style=""><span style="">B、客户端将json字符串转换为相应的javaBean</span></strong><br style=""><span style=""><wbr><span></span>首先客户端也要导入fastjson的两个jar包</wbr></span><br style=""><strong style="">1、客户端获取json字符串</strong><br style=""><span style="">public class HttpUtil<br> {<br><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><br><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><span></span>public static String getJsonContent(String urlStr)<br><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><span></span>{<br><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><span></span><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><span></span>try<br><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><span></span><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><span></span>{// 获取HttpURLConnection连接对象<br><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><span></span><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><span></span><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><span></span>URL url = new URL(urlStr);<br><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><span></span><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><span></span><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><span></span>HttpURLConnection httpConn = (HttpURLConnection) url<br><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><span></span><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><span></span><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><span></span><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><span></span><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><span></span>.openConnection();<br><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><span></span><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><span></span><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><span></span>// 设置连接属性<br><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><span></span><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><span></span><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><span></span>httpConn.setConnectTimeout(3000);<br><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><span></span><wbr><wbr><wbr><wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></span></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></p></wbr>