怎么一加就转发到错误处理页面errorpage.jsp了？

2004-10-23 06:04:22 244 阅读 AI 写同款 · GEO 优化AI 选题数据监测一键分发 ›

JSP 2.3 与 Servlet 3.1 核心机制对比：从翻译到执行的5个关键差异点本文深入对比了JSP 2.3与Servlet 3.1的核心机制差异，包括编译时机、内置对象、生命周期、请求处理流程和错误处理等5个关键点。通过代码示例和流程分析，揭示了Java Web开发中这两大技术的本质区别与适用场景，帮助开发者优化技术选型和性能调优策略。阅读详情

插入一条信息，如果没有填写其中的两项，应该回到表单，显示错误，但如果加上<html:errors/>，就直接转发到错误处理页面了，我把源代码的页面和actionform复制了过来，也还是这样，错误原因显示的还是null，去掉就好了，但源代码的例子运行却正常，这是为什么？
ActionForm:
package addressbook.forms;

import javax.servlet.http.HttpServletRequest;
import org.apache.struts.action.ActionMessage;
import org.apache.struts.action.ActionErrors;
import org.apache.struts.action.ActionForm;
import org.apache.struts.action.ActionMapping;

/**
* <strong>InsertForm</strong> handles the form
* that the user will use to insert a new Address into
* the database.
*/

public final class InsertForm extends ActionForm {

private String name = null;
private String phone = null;
private String address = null;
private String page=null;

public String getName() {
return name;
}
public String getPhone() {
return phone;
}
public String getAddress() {
return address;
}

public String getPage(){
return page;
}
public void reset(ActionMapping mapping, HttpServletRequest request) {
int numPage=0;
try{ numPage=new Integer(request.getParameter("page")).intValue();}catch(Exception e){}
if(numPage==1){
name=null;
phone=null;
}
if(numPage==2){
address=null;
}
page=null;
}

public void setName(String name) {
this.name = name;
}
public void setPhone(String phone) {
this.phone= phone;
}
public void setAddress(String address) {
this.address = address;
}

public void setPage(String page){
this.page=page;
}
public ActionErrors validate(ActionMapping mapping,
HttpServletRequest request) {

ActionErrors errors = new ActionErrors();
int numPage=0;
try{ numPage=new Integer(page).intValue();}catch(Exception e){}
if(numPage==1){
if (((name == null) || (name.length() < 1)))
errors.add("name", new ActionMessage("error.name.required"));
if(((phone == null)|| (phone.length() < 1)))
errors.add("phone", new ActionMessage("error.phone.required"));
}

if(numPage==2){
if(((address == null)|| (address.length() < 1)))
errors.add("address", new ActionMessage("error.address.required"));
}
return errors;

}
}
jsP:taglibs.jsp专门声明引用哪些tag，错误页名,<app:validateSession/>校验是否登录
<%@ include file="taglibs.jsp" %>
<app:validateSession/>
<html:errors/>
<html:form action="/insert1.do" focus="title">
<html:hidden property="page" value="1"/>
<center>
<table border="0" cellspacing="2" cellpadding="2" width="100%">
<tr>
<td align="right"> <bean:message key="prompt.name"/></td>
<td><html:text property="name" size="25" maxlength="25"/></td>
</tr>
<tr>
<td align="right"> <bean:message key="prompt.phone"/></td>
<td><html:text property="phone" size="25" maxlength="10"/></td>
</tr>
<tr>
<td align="right">
<html:submit property="submit" value="next">
<bean:message key="button.insert"/>
</html:submit>
</td>
<td align="left">
<html:reset >
<bean:message key="button.reset"/>
</html:reset>
</td>
</tr>
</table>
</center>
</html:form>
<html:link forward="mainMenu"><bean:message key="goto.mainMenu"/></html:link>

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