java.lang.NumberFormatException: null

a4535361 2009-06-10 07:13:46

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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a4535361 2009-06-11

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[Quote=引用 5 楼 weiluo12 的回复:]
引用 4 楼 yangkangoo12 的回复:
int cid = Integer.parseInt(request.getParameter("cid")); 这里有问题
当request.getParameter("cid")==""或request.getParameter("cid")==null时都会报错
应改为
int cid = 0;
if(request.getParameter("cid")!=null&&request.getParameter("cid")!=""){
cid = Integer.parseInt(request.getParameter("cid"));
}

定义一个局部变量一般要先初始化，这是一种的编程习惯！
[/Quote]

可以跳到那个页面可是跳到那个页面后就是空白的数据迭代不出来

weiluo12 2009-06-11

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[Quote=引用 4 楼 yangkangoo12 的回复:]
int cid = Integer.parseInt(request.getParameter("cid")); 这里有问题
当request.getParameter("cid")==""或request.getParameter("cid")==null时都会报错
应改为
int cid = 0;
if(request.getParameter("cid")!=null&&request.getParameter("cid")!=""){
cid = Integer.parseInt(request.getParameter("cid"));
}
[/Quote]
定义一个局部变量一般要先初始化，这是一种的编程习惯！

yangkangoo12 2009-06-11

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int cid = Integer.parseInt(request.getParameter("cid")); 这里有问题
当request.getParameter("cid")==""或request.getParameter("cid")==null时都会报错
应改为
int cid = 0;
if(request.getParameter("cid")!=null&&request.getParameter("cid")!=""){
cid = Integer.parseInt(request.getParameter("cid"));
}