我有类似下面的表单字段
<form action="test" name="formtest" method="post">
<input type="hidden" name="testid" value ="12345">
</form>
现在在servlet中我做了类似
的事情int testid = Integer.parseInt(request.getParameter("testid"));
我得到Null指针异常，不知怎的，我相信即使这些形式有价值，它也不会被拿到servlet。
我没有想法，需要第二眼看看我错过了什么。我的表单已启用，并且值由jquery动态填充。但是我测试使用静态值来删除任何jquery问题提供的值。但仍然没有快乐。
因为我试图解析空值，所以我得到了异常。
java.lang.NumberFormatException: null
at java.lang.Integer.parseInt(Integer.java:415)
at java.lang.Integer.parseInt(Integer.java:497)
at test.jobs.viewaddtojobs.processRequest(viewaddtojobs.java:41)
at test.jobs.viewaddtojobs.doPost(viewaddtojobs.java:149)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:641)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:722)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:305)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
at org.netbeans.modules.web.monitor.server.MonitorFilter.doFilter(MonitorFilter.java:393)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:243)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
at listener.trimresponse.doFilter(trimresponse.java:45)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:243)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
at org.tuckey.web.filters.urlrewrite.RuleChain.handleRewrite(RuleChain.java:176)
at org.tuckey.web.filters.urlrewrite.RuleChain.doRules(RuleChain.java:145)
at org.tuckey.web.filters.urlrewrite.UrlRewriter.processRequest(UrlRewriter.java:92)
at org.tuckey.web.filters.urlrewrite.UrlRewriteFilter.doFilter(UrlRewriteFilter.java:394)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:243)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:225)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:169)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:472)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:168)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:98)
at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:927)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:407)
at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:999)
at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:565)
at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:307)
at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
at java.lang.Thread.run(Thread.java:619)
jsp表格
<form id="id-frm-gg" class="cl-frm-gg" action="JobsAdd" method="post" name="frmgg" enctype="multipart/form-data">
<label class="cl-ilab">Your Job will be posted in Section: <span id="sp-jobs-category" class="cl-jobs"><%= request.getAttribute("selectedjob")%></span></label><span id="id-error-sc" class="cl-info"></span><br><br`enter code here`>
<input type="hidden" name="subcategoryid" value="12001">
<input type="hidden" name="subcategory" value="<%= request.getAttribute("selectedjob")%>">
<label id="id-status-info" class="cl-ilab">This Job Requirement is posted from : <span id="id-error-auto-status" class="cl-info"></span></label>
<p id="id-status-check" class="cl-ch">
<label class="cl-ilab">
<input type="radio" name="status" value="business-owner" id="status_0">
Direct Business Owner</label>
<label class="cl-ilab">
<input type="radio" name="status" value="recruiter" id="status_1">
Recruiter</label>
<br>
</p>
<br>
<label id="id-job-status-info" class="cl-ilab">This Job is : <span id="id-error-job-status" class="cl-info"></span></label>
<p id="id-job-status" class="cl-ch">
<label class="cl-ilab">
<input type="radio" name="jobstatus" value="contract" id="jobstatus_0">
Contract</label>
<label class="cl-ilab">
<input type="radio" name="jobstatus" value="part-time" id="jobstatus_1">
Part-time</label>
<label class="cl-ilab">
<input type="radio" name="jobstatus" value="internship" id="jobstatus_2">
Internship</label>
<label class="cl-ilab">
<input type="radio" name="jobstatus" value="non-profit" id="jobstatus_3">
Non Profit</label>
<label class="cl-ilab">
<input type="radio" name="jobstatus" value="remote" id="jobstatus_4">
Remote</label>
<label class="cl-ilab">
<input type="radio" name="jobstatus" value="fulltime" id="jobstatus_5">
Full-time </label>
<br>
</p>
<br>
<label class="cl-ilab">Designation:</label>
<input name="txtdesignation" type="text" class="cl-txt" id="id-txtdesignation" tabindex="4" title="Enter the designation details for job offered" size="55" maxlength="100"><span id="id-sinfo" class="cl-info"></span> <label class="cl-ilab">Job Keywords:</label>
<input name="txtkeywords" type="text" class="cl-txt" id="id-txt" tabindex="5" title="Please enter job keywords" size="50" maxlength="100"><span id="id-nsinfo" class="cl-info"></span>
<br><br>
<label class="cl-ilab">Experiences(in Months):</label>
<input name="txtexperience" type="text" class="cl-txtexperience" id="id-txtexperience" tabindex="5" title="Enter the experience required for this Job" size="5" maxlength="10"> <span id="id-error-experience" class="cl-info"></span>
<label class="cl-ilab">Job Location:</label>
<input name="txtlocation" type="text" class="cl-txt" id="id-txtlocation" tabindex="4" title="Please enter the job location details for job offered" size="55" maxlength="100"><span id="id-job-location-info" class="cl-info"></span>
<label class="cl-ilab">
<input type="radio" name="telecommute" value="telecommute" id="id-telecommute" title="Please check if telecommute is ok for this job">
Telecommute Ok ?</label>
<br><br>
<label class="ilab">Contact Email:</label>
<input name="txtemail" type="text" class="cl-txtemail" id="id-txtemail" tabindex="7" title="Please enter your valid email id to contact you with regard to this Job" size="40"> <span id="id-emailinfo" class="cl-info"></span>
<label class="ilab">Contact Phone:</label>
<input name="txtphone" type="text" class="cl-txtphone" id="id-txtphone" tabindex="8" title="Please enter your valid Phone number to talk about this Job" size="10" maxlength="15">
<span id="id-phoneinfo" class="cl-info"></span>
<label class="cl-slab">Industry Type: </label>
<select name="txtindustrytype" style="width:160px;" class="cl-select">
<option value="Select">Select Country</option>
<option value="USA" selected>United States</option>
</select> <span id="id-industrytypeinfo" class="cl-info"></span>
<br><br>
<label class="cl-ilab">Desired Education:</label>
<input name="txteducation" type="text" class="cl-txt" id="id-txteducation" tabindex="4" title="Please enter the desired education details for Job Fitment" size="55" maxlength="100"><span id="id-education-info" class="cl-info"></span>
<br><br>
<label class="ilab">Title:</label>
<input name="txttitle" type="text" class="cl-txttitle" id="id-txttitle" tabindex="8" maxlength="100" title="Please enter the title of this Job requirement in 100 words" size="150">
<span id="id-titleinfo" class="cl-info"></span>
<p id="id-title-max" class="cl-title-max">Max characters accepted in Title field is 100.Characters Left:<span id="id-c" class="charsLeft"><b>100</b></span></p>
<label class="ilab">Job Description: <span id="id-desinfo" class="cl-info"></span></label><br>
<textarea name="txtdescription" cols="100" rows="20" class="cl-desc" id="id-desc" title="Please enter the jobdescription"></textarea>
<br>
<label class="ilab">Desired Job Skills: <span id="id-jobskillsinfo" class="cl-info"></span></label><br>
<textarea name="txtjobskills" cols="100" rows="20" class="cl-desc" id="id-jobskills" title="Please enter the desired skillsets of your job requirement"></textarea>
<br>
<label class="ilab">Job Benefits Offered: <span id="id-jobbenefitinfo" class="cl-info"></span></label><br>
<textarea name="txtjobbenefits" cols="100" rows="20" class="cl-desc" id="id-jobbenefits" title="Please enter the Job benefits if any offered"></textarea>
<br>
<p id="id-tc" class="cl-tc-info">By Posting in this Site,We assume that you agree to our <a href="www.google.com" title="Terms and Conditions">Terms and Conditions</a>.</p><br>
<input name="Submit" type="submit" class="cl-frm" id="id-submit" tabindex="10" title="Submit" value="Submit">
<input name="Cancel" type="reset" class="cl-frm" id="id-cancel" tabindex="12" title="Cancel" value="Cancel">
<br><br>
</form>
的servlet
protected void processRequest(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
response.setContentType("text/html;charset=UTF-8");
java.sql.Timestamp sqlDateTime = new java.sql.Timestamp(new java.util.Date().getTime());
PrintWriter out = response.getWriter();
bnaddtojobsFormbn jobsForm = new bnaddtojobsFormbn();
try {
int subcategoryid = Integer.parseInt(request.getParameter("subcategoryid"));
System.out.println("subcategoryid = " + subcategoryid);
jobsForm.setSubcategoryid(subcategoryid);
String subcategory = request.getParameter("subcategory");
jobsForm.setSubcategory(subcategory);
String status = request.getParameter("status");
jobsForm.setPosterinfo(status);
String jobstatus = request.getParameter("jobstatus");
jobsForm.setJobtype(jobstatus);
String txtdesignation = request.getParameter("txtdesignation");
jobsForm.setDesignation(txtdesignation);
String txtkeywords = request.getParameter("txtkeywords");
jobsForm.setKeywords(txtkeywords);
String txtexperience = request.getParameter("experience");
jobsForm.setExperience(txtexperience);
String txtlocation = request.getParameter("txtlocation");
jobsForm.setLocation(txtlocation);
String telecommute = request.getParameter("telecommute");
jobsForm.setTelecommute(telecommute);
String txtemail = request.getParameter("txtemail");
jobsForm.setEmail(txtemail);
String txtphone = request.getParameter("txtphone");
jobsForm.setContact(jobstatus);
String txtindustrytype = request.getParameter("txtindustrytype");