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	<title>Neeke &#187; java对象转json</title>
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		<title>将JavaBean及List集合转换为JSON</title>
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		<pubDate>Fri, 13 Mar 2009 13:21:50 +0000</pubDate>
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				<category><![CDATA[ExtJS]]></category>
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		<description><![CDATA[<p>由于我的那个GridPanel要求数据源提供的数据为JSON格式，而我用Hibernate查出来的要么是List集合要么就是JavaBean。要把这样的数据转成JSON格式我是手工拼出来的。可是我很懒，我想用更简单更快捷的方式把他们转成JSON，为了实现这种转换，就必须找到传说中的如下6个jar包。</p>
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			<content:encoded><![CDATA[<p>由于我的那个GridPanel要求数据源提供的数据为JSON格式，而我用Hibernate查出来的要么是List集合要么就是JavaBean。要把这样的数据转成JSON格式我是手工拼出来的。可是我很懒，我想用更简单更快捷的方式把他们转成JSON，为了实现这种转换，就必须找到传说中的如下6个jar包。<br />
commons-beanutils-1.7.0.jar<br />
commons-collections-3.2.jar<br />
commons-lang-2.0.jar<br />
commons-logging-1.0.4.jar<br />
ezmorph-1.0.2.jar<br />
json-lib-2.2.2-jdk15.jar<br />
在net.sf.json.*下为你提供了很多工具类。但是这个直接转换出来的JSON还不是我想要的最终效果，我还需要指定数据总数等，而且这种格式要被多次使用。于是自己写了个工具类，对其进行了简单的封装。</p>

<div class="wp_syntax"><div class="code"><pre class="java" style="font-family:monospace;"><span style="color: #000000; font-weight: bold;">import</span> <span style="color: #006699;">java.util.Hashtable</span><span style="color: #339933;">;</span>
<span style="color: #000000; font-weight: bold;">import</span> <span style="color: #006699;">java.util.List</span><span style="color: #339933;">;</span>
<span style="color: #000000; font-weight: bold;">import</span> <span style="color: #006699;">java.util.Map</span><span style="color: #339933;">;</span>
<span style="color: #000000; font-weight: bold;">import</span> <span style="color: #006699;">net.sf.json.JSONObject</span><span style="color: #339933;">;</span>
<span style="color: #000000; font-weight: bold;">public</span> <span style="color: #000000; font-weight: bold;">class</span> Java2JSON <span style="color: #009900;">&#123;</span>
<span style="color: #000000; font-weight: bold;">public</span> <span style="color: #000000; font-weight: bold;">static</span> JSONObject generate<span style="color: #009900;">&#40;</span>List<span style="color: #339933;">&lt;?&gt;</span> list,<span style="color: #000066; font-weight: bold;">int</span> count<span style="color: #009900;">&#41;</span> <span style="color: #009900;">&#123;</span>
Map<span style="color: #339933;">&lt;</span>String, Object<span style="color: #339933;">&gt;</span> map <span style="color: #339933;">=</span> <span style="color: #000000; font-weight: bold;">new</span> Hashtable<span style="color: #339933;">&lt;</span>String, Object<span style="color: #339933;">&gt;</span><span style="color: #009900;">&#40;</span><span style="color: #009900;">&#41;</span><span style="color: #339933;">;</span>
map.<span style="color: #006633;">put</span><span style="color: #009900;">&#40;</span><span style="color: #0000ff;">&quot;totalCount&quot;</span>, count<span style="color: #009900;">&#41;</span><span style="color: #339933;">;</span>
map.<span style="color: #006633;">put</span><span style="color: #009900;">&#40;</span><span style="color: #0000ff;">&quot;topics&quot;</span>, list<span style="color: #009900;">&#41;</span><span style="color: #339933;">;</span>
<span style="color: #000000; font-weight: bold;">return</span> JSONObject.<span style="color: #006633;">fromObject</span><span style="color: #009900;">&#40;</span>map<span style="color: #009900;">&#41;</span><span style="color: #339933;">;</span>
<span style="color: #009900;">&#125;</span>
<span style="color: #000000; font-weight: bold;">public</span> <span style="color: #000000; font-weight: bold;">static</span> JSONObject javabean2json<span style="color: #009900;">&#40;</span><span style="color: #003399;">Object</span> object<span style="color: #009900;">&#41;</span> <span style="color: #009900;">&#123;</span>
Map<span style="color: #339933;">&lt;</span>String, Object<span style="color: #339933;">&gt;</span> map <span style="color: #339933;">=</span> <span style="color: #000000; font-weight: bold;">new</span> Hashtable<span style="color: #339933;">&lt;</span>String, Object<span style="color: #339933;">&gt;</span><span style="color: #009900;">&#40;</span><span style="color: #009900;">&#41;</span><span style="color: #339933;">;</span>
map.<span style="color: #006633;">put</span><span style="color: #009900;">&#40;</span><span style="color: #0000ff;">&quot;success&quot;</span>, <span style="color: #000066; font-weight: bold;">true</span><span style="color: #009900;">&#41;</span><span style="color: #339933;">;</span>
map.<span style="color: #006633;">put</span><span style="color: #009900;">&#40;</span><span style="color: #0000ff;">&quot;data&quot;</span>, object<span style="color: #009900;">&#41;</span><span style="color: #339933;">;</span>
<span style="color: #000000; font-weight: bold;">return</span> JSONObject.<span style="color: #006633;">fromObject</span><span style="color: #009900;">&#40;</span>map<span style="color: #009900;">&#41;</span><span style="color: #339933;">;</span>
<span style="color: #009900;">&#125;</span>
<span style="color: #009900;">&#125;</span></pre></div></div>

<p>转换的结果是JSONObject类型，调用该对象自身的toString()方法即可得到JSON语句。</p>
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