java.lang.NumberFormatException: null

a4535361 2009-06-10 07:15:51

最近在做SSH整合, 在实现修改的时候出现这样的一个错误:
java.lang.NumberFormatException: null
at java.lang.Integer.parseInt(Integer.java:415)
at java.lang.Integer.parseInt(Integer.java:497)
at com.wad.web.action.EditdataAction.execute(EditdataAction.java:38)
at org.springframework.web.struts.DelegatingActionProxy.execute(DelegatingActionProxy.java:110)
at org.apache.struts.action.RequestProcessor.processActionPerform(RequestProcessor.java:431)
at org.apache.struts.action.RequestProcessor.process(RequestProcessor.java:236)
at org.apache.struts.action.ActionServlet.process(ActionServlet.java:1196)
at org.apache.struts.action.ActionServlet.doGet(ActionServlet.java:414)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:690)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at com.wad.system.EncodingFilter.doFilter(EncodingFilter.java:26)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:175)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:128)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:286)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:844)
at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:583)
at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:447)
at java.lang.Thread.run(Thread.java:619)

我把这个功能的代码贴出来,希望有朋友可以为我解答

DAO中的代码:
public CompanyBuss getDataById(int cid) throws Exception {

return (CompanyBuss) this.getHibernateTemplate().get(CompanyBuss.class,new Integer(cid));
}

BO中的代码:
public CompanyBuss getDataById(int cid) throws Exception {
return addsjdao.getDataById(cid);

}

Action中的代码:
public class EditdataAction extends Action {
private AddSJBoInter editdata;
public AddSJBoInter getEditdata() {
return editdata;
}
public void setEditdata(AddSJBoInter editdata) {
this.editdata = editdata;
}
public ActionForward execute(ActionMapping mapping, ActionForm form,
HttpServletRequest request, HttpServletResponse response) {
EditdataForm editdataForm = (EditdataForm) form;
try{
int cid = Integer.parseInt(request.getParameter("cid"));
request.setAttribute("compan", editdata.getDataById(cid));

return mapping.findForward("sucess");

}catch(Exception e){
e.printStackTrace();
return mapping.getInputForward();
}

}
}
JSP页面的代码:

<body>
<body>
<center>

<table border="1">

<tr>

<th>公司名称 </th>
<th>公司所属类型 </th>
<th>公司信息简介 </th>
<th>修改 </th>
</tr>
<logic:present name="editForm" property="list">
<logic:iterate id="item" name="editForm" property="list">

<tr>

<td>${item.cname} </td>
<td>${item.ctype} </td>
<td>${item.cinfo} </td>
<td> <a href="/T4BOSS/editdata.do? cid=${item.cid }">修改 </a> </td>
</tr>
</logic:iterate>
</logic:present>

</table>

</center>
如果成功后的话会跳到这个页面.可是跳不过去会报那个错误,有些人说和JSP页面传值在Action定义String类型可以我以前没定义的时候也可以出来不知道怎么回事希望高手帮我解决
<body>
<center>
<table>
<html:hidden property="cid" value="${compan.cid}"/>
<tr>

<td>公司名称: <html:text property="cname" value="${compan.cname}"> </html:text> <br> </td> </tr>
<tr>

<td>
公司所属类型: <html:text property="ctype" value="${compan.ctype}"> </html:text>

</td> </tr>
<tr> <td>公司信息简介: <html:textarea property="cinfo" value="${compan.cinfo}"> </html:textarea> <br> </td>
</tr>

</table>

</center>
</body>

谢谢了写详细点

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huangan0301 2009-06-11

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那就又是别的问题了~~看你后面的页面用到了html标签，标签库导进来没啊

jokerdx 2009-06-11

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帮顶~~~~~~~~~~~~~

a4535361 2009-06-11

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String cd = request.getParameter("cid");
int cid = 0;
if(cd!=null){
cid = Integer.parseInt(cd);
}
这样的话可以出来可是跳到那个页面就是空白的什么也没有的

huangan0301 2009-06-10

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int cid = Integer.parseInt(request.getParameter("cid"));
应该是这句出问题了~~我原来也经常遇到这样的问题~~其实这是写代码不规范的一种表现，改成下面的代码：



  

String cd  = request.getParameter("cid");

int cid = 0;

if(cd!=null){

   cid =  Integer.parseInt(cd);  

}

yinglu206 2009-06-10

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[Quote=引用 2 楼 xnjnmn 的回复:]
int cid = Integer.parseInt(request.getParameter("cid"));

cid没有取得为NULL
你输出下或是debug下就知道
[/Quote]

at com.wad.web.action.EditdataAction.execute(EditdataAction.java:38)
错误就是在Action的Cid