HTTP Status 404 - /Struts_HelloWorld/HelloWorld.jsp错误怎么解决

是因为struts.xml文件头写错了
正确写法是：
<!DOCTYPE struts PUBLIC
          "-//Apache Software Foundation//DTD Struts Configuration 2.0//EN"
          "http://struts.apache.org/dtds/struts-2.0.dtd">而你写的是：
<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE struts PUBLIC
    "system11"
    "struts-2.0.dtd">这个最好直接到官网上下载，直接复制粘贴

我就照着教程把几个放进去了，没有把全部jar包放进去

我这样改了，也还是不行,还是显示404这里的struts.xml图标也不是一个X的样子

哪里有HelloWorld.jsp？？？你是怎么请求的？

上面最后一串代码就是HelloWorld.jsp啊。请求的话在struts.xml里配置了吧？

在这里的.xml格式就是这个图标的，

我仿照你的代码写了一个：StudentAction.java：
/**
*
*/
package com.you.action;import com.opensymphony.xwork2.ActionSupport;/**
* @author Administrator
*
*/
public class StudentAction extends ActionSupport
{
/**
*
*/
private static final long serialVersionUID = 1L;

private String message; @Override
public String execute() throws Exception
{
if("".equals(message))
{
return "error";
}
else
{
return "success";
}
} /**
* @return the message
*/
public String getMessage() {
return message;
} /**
* @param message the message to set
*/
public void setMessage(String message) {
this.message = message;
}}
struts.xml：

<!DOCTYPE struts PUBLIC
          "-//Apache Software Foundation//DTD Struts Configuration 2.0//EN"
          "http://struts.apache.org/dtds/struts-2.0.dtd">
<struts>
    <package name="default" extends="struts-default">
        <action name="StudentAction" class="com.you.action.StudentAction">
            <result name="success">student.jsp</result>
            <result name="error">error.jsp</result>
        </action>
    </package>
</struts>web.xml：
<?xml version="1.0" encoding="UTF-8"?>
<web-app version="2.5"
xmlns="http://java.sun.com/xml/ns/javaee"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://java.sun.com/xml/ns/javaee
http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd">
  <display-name></display-name>

  <filter>
<filter-name>struts2</filter-name>
<filter-class>org.apache.struts2.dispatcher.FilterDispatcher</filter-class>
  </filter>
  <filter-mapping>
    <filter-name>struts2</filter-name>
    <url-pattern>/*</url-pattern>
  </filter-mapping>

  <welcome-file-list>
    <welcome-file>index.jsp</welcome-file>
  </welcome-file-list>
</web-app>
student.jsp：
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%><!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
  <head>
    <base href="<%=basePath%>">

    <title>My JSP 'student.jsp' starting page</title>

<meta http-equiv="pragma" content="no-cache">
<meta http-equiv="cache-control" content="no-cache">
<meta http-equiv="expires" content="0">
<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
<meta http-equiv="description" content="This is my page">
  </head>

  <body>
    <form id="form1" name="form1" method="post" action="StudentAction.action">
     <p>输入信息：
       <input type="text" name="message" id="username"/>
     </p>
     <p><input type="submit" name="submit" value="提交"></p>
    </form>
  </body>
</html>error.jsp：
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%><!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
  <head>
    <base href="<%=basePath%>">

    <title>My JSP 'error.jsp' starting page</title>

<meta http-equiv="pragma" content="no-cache">
<meta http-equiv="cache-control" content="no-cache">
<meta http-equiv="expires" content="0">
<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
<meta http-equiv="description" content="This is my page">
  </head>

  <body>
    This is my JSP page. <br>
  </body>
</html>
浏览器地址：http://localhost:8080/struts/student.jsp
当输入框中输入“you”点击“提交”，会将内容提交；当输入框中的内容为空时，点击提交
地址栏的地址变为：http://localhost:8080/struts/StudentAction.action

//你的HelloWorld类继承ActionSupport了吗？
public class HelloWorld extends ActionSupport {
...............
}

代码就是照着你的代码输进去的，
StudentAction.java
package com.you.action;import com.opensymphony.xwork2.ActionSupport;public class StudentAction extends ActionSupport{
private static final long serialVersionUID=1L;
private String message;
public String execute() throws Exception
{
if("".equals(message))
{
return "error";
}
else
{
return "success";
}
}
public String getMessage(){
return message;
}
public void setMessage(String message){
this.message=message;
}
}
struts.xml

<!DOCTYPE struts PUBLIC
          "-//Apache Software Foundation//DTD Struts Configuration 2.0//EN"
          "http://struts.apache.org/dtds/struts-2.0.dtd">
<struts>
    <package name="default" extends="struts-default">
        <action name="StudentAction" class="com.you.action.StudentAction">
            <result name="success">student.jsp</result>
            <result name="error">error.jsp</result>
        </action>
    </package>
</struts>
web.xml
<?xml version="1.0" encoding="UTF-8"?>
<web-app version="2.5"
xmlns="http://java.sun.com/xml/ns/javaee"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://java.sun.com/xml/ns/javaee
http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd">
  <display-name></display-name>

  <filter>
<filter-name>struts2</filter-name>
<filter-class>org.apache.struts2.dispatcher.FilterDispatcher</filter-class>
  </filter>
  <filter-mapping>
    <filter-name>struts2</filter-name>
    <url-pattern>/*</url-pattern>
  </filter-mapping>

  <welcome-file-list>
    <welcome-file>index.jsp</welcome-file>
  </welcome-file-list>
</web-app>
student.jsp
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%><!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
  <head>
    <base href="<%=basePath%>">

    <title>My JSP 'student.jsp' starting page</title>

<meta http-equiv="pragma" content="no-cache">
<meta http-equiv="cache-control" content="no-cache">
<meta http-equiv="expires" content="0">
<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
<meta http-equiv="description" content="This is my page">
  </head>

  <body>
    <form id="form1" name="form1" method="post" action="StudentAction.action">
     <p>输入信息：
       <input type="text" name="message" id="username"/>
     </p>
     <p><input type="submit" name="submit" value="提交"></p>
    </form>
  </body>
</html>
error.jsp
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%><!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
  <head>
    <base href="<%=basePath%>">

    <title>My JSP 'error.jsp' starting page</title>

<meta http-equiv="pragma" content="no-cache">
<meta http-equiv="cache-control" content="no-cache">
<meta http-equiv="expires" content="0">
<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
<meta http-equiv="description" content="This is my page">
  </head>

  <body>
    This is my JSP page. <br>
  </body>
</html>

这里改成这样试试 <result name="success">/student.jsp</result>
<result name="error">/error.jsp</result>

应用的上下文配置了么？右键应用 properties 在里面看看?或者双击tomcat server 点击modules 查看

struts.xml配置文件放错位置了，放在src下面或者在web.xml下配置struts.xml位置

这里改成这样试试 <result name="success">/student.jsp</result>
<result name="error">/error.jsp</result>
也不行额

错了在src下放src下好像也不行

我看了下。你strut里配置的success是success.jsp..而你的项目里没有这个页面吧。你那个改成你要跳转的页面就好了。

错了在src下放src下好像也不行项目发给我看下

错了在src下放src下好像也不行项目发给我看下留个QQ？还是？

楼主你的tomact的server.xml后面加上 <Context docBase="MyWebPage" path="/MyWebPage" reloadable="true" source="org.eclipse.jst.jee.server:项目名称"/>

开debug调试，看能不能进行action后台

错了在src下放src下好像也不行项目发给我看下留个QQ？还是？
[email protected] 发邮箱吧

调试易

HTTP Status 404 - /Struts_HelloWorld/HelloWorld.jsp错误怎么解决

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