Struts2配置后跳转报错解决方法

很多人刚开始学习struts2时会遇到配置完 web.xml ,struts.xml后启工程或写一个简单的页面跳转会报错情况，我把我遇到的几种情况和解决方法贴出来分享下 1.启工程时报 ClassNotFound 这样的错误 我一般出这种问题可以通过错误信息先找引用时缺失哪个文件，大多数情况可能是jar包缺失，一般struts2需要引用以下几个包： asm-3.3.jar asm-commons-3.3.jar commons-fileupload-1.3.jar commons-io-2.2.jar commons-lang-2.4.jar commons-logging-1.1.3.jar freemarker-2.3.19.jar javassist-3.11.0.GA.jar ognl-3.0.6.jar struts2-core-2.3.16.jar xwork-core-2.3.16.jar commons-lang3-3.1.jar 2.写好测试类跳转出错 no Action mapped web.xml <div><pre id="codeSnippet" style="border-top-style: none; overflow: visible; font-size: 8pt; font-family: 'Courier New', courier, monospace; width: 100%; border-bottom-style: none; color: black; padding-bottom: 0px; direction: ltr; text-align: left; padding-top: 0px; border-right-style: none; padding-left: 0px; margin: 0em; border-left-style: none; line-height: 12pt; padding-right: 0px; background-color: #f4f4f4"><?xml version="1.0" encoding="utf-8"?> <web-app 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" id="WebApp_ID" version="2.5"> <display-name>geminimanager</display-name> <filter> <filter-name>struts2</filter-name> <filter-class>org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter</filter-class> </filter> <filter-mapping> <filter-name>struts2</filter-name> <url-pattern>/*</url-pattern> </filter-mapping> <welcome-file-list> <welcome-file>/login/login.jsp</welcome-file> </welcome-file-list> </web-app> </pre></div>

<div>struts.xml</div> <div> <div id="codeSnippetWrapper"><pre id="codeSnippet" style="border-top-style: none; overflow: visible; font-size: 8pt; font-family: 'Courier New', courier, monospace; width: 100%; border-bottom-style: none; color: black; padding-bottom: 0px; direction: ltr; text-align: left; padding-top: 0px; border-right-style: none; padding-left: 0px; margin: 0em; border-left-style: none; line-height: 12pt; padding-right: 0px; background-color: #f4f4f4"><?xml version="1.0" encoding="UTF-8"?> <!DOCTYPE struts PUBLIC "-//Apache Software Foundation//DTD Struts Configuration 2.3//EN" "http://struts.apache.org/dtds/struts-2.3.dtd"> <struts> <package name="test" namespace="/test" extends="struts-default"> <action name="login" class="com.gemini.action.LoginAction"> <result name="success" >/login/success.jsp</result> <result name="error">/login/error.jsp</result> </action> </package> </struts></pre>login.jsp</div> <div> <div id="codeSnippetWrapper"> <div id="codeSnippetWrapper"> <div id="codeSnippetWrapper"> <div id="codeSnippetWrapper"><pre id="codeSnippet" style="border-top-style: none; overflow: visible; font-size: 8pt; font-family: 'Courier New', courier, monospace; width: 100%; border-bottom-style: none; color: black; padding-bottom: 0px; direction: ltr; text-align: left; padding-top: 0px; border-right-style: none; padding-left: 0px; margin: 0em; border-left-style: none; line-height: 12pt; padding-right: 0px; background-color: #f4f4f4"><%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%> <%@ taglib prefix="s" uri="/struts-tags" %> <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8"> <title>测试登录</title> </head> <body> <s:form action="/test/login.action" method="post" > <s:textfield label="用户名" name="userinfo.username"></s:textfield> <s:password label="密码" name="userinfo.userpassword"></s:password> <s:password label="重复密码" name="userinfo.userRePassword"></s:password> <s:textfield label="昵称" name="userinfo.usernickname"></s:textfield> <s:submit value="accept"></s:submit> </s:form> </body> </html></pre>UserInfo.java <div id="codeSnippetWrapper"><pre id="codeSnippet" style="border-top-style: none; overflow: visible; font-size: 8pt; font-family: 'Courier New', courier, monospace; width: 100%; border-bottom-style: none; color: black; padding-bottom: 0px; direction: ltr; text-align: left; padding-top: 0px; border-right-style: none; padding-left: 0px; margin: 0em; border-left-style: none; line-height: 12pt; padding-right: 0px; background-color: #f4f4f4">package com.gemini.pojo; public class UserInfo { private String username; private String userpassword; private String userRePassword; private String usernickname; public UserInfo(String username, String userpassword, String userRePassword, String usernickname) { this.username = username; this.userpassword = userpassword; this.userRePassword = userRePassword; this.usernickname = usernickname; } public UserInfo() { } public String getUsername() { return username; } public void setUsername(String username) { this.username = username; } public String getUserpassword() { return userpassword; } public void setUserpassword(String userpassword) { this.userpassword = userpassword; } public String getUserRePassword() { return userRePassword; } public void setUserRePassword(String userRePassword) { this.userRePassword = userRePassword; } public String getUsernickname() { return usernickname; } public void setUsernickname(String usernickname) { this.usernickname = usernickname; } } </pre>LoginAction.java <div id="codeSnippetWrapper"><pre id="codeSnippet" style="border-top-style: none; overflow: visible; font-size: 8pt; font-family: 'Courier New', courier, monospace; width: 100%; border-bottom-style: none; color: black; padding-bottom: 0px; direction: ltr; text-align: left; padding-top: 0px; border-right-style: none; padding-left: 0px; margin: 0em; border-left-style: none; line-height: 12pt; padding-right: 0px; background-color: #f4f4f4">package com.gemini.action; import org.apache.commons.lang.StringUtils; import com.gemini.pojo.UserInfo; import com.opensymphony.xwork2.ActionSupport; public class LoginAction extends ActionSupport { private UserInfo userinfo; @Override public String execute() throws Exception { if(StringUtils.equals(userinfo.getUsername(),"liuwei")){ return SUCCESS; }else{ return ERROR; } } public UserInfo getUserinfo() { return userinfo; } public void setUserinfo(UserInfo userinfo) { this.userinfo = userinfo; } } </pre>上面代码是调试好后的，成功返回页面代码略去，报过There is no Action mapped for namespace [/] and action name…错误</div></div></div></div></div> <div>归结起来有这几种情况：</div> <div>1.struts.xml、struts-default等自定义命名或拼错造成识别不出来；</div> <div>2.struts.xml的位置不正确，或自定了struts.xml位置，默认应该在src目录下编译后在classes根目录下（检查编译路径是不是自己改了，默认是 WebRoot/WEB-INF/classes）；</div> <div>3.命名空间配置出了问题,比如struts.xml里的namespace配置了”/test”,则前端login.jsp的action就必须带上”/test”，可以“/test/login.action”也可以”AAA/BBB/test/login.action”,这样写都会认，可是配置了namespace后action里却不带”/test”则会报错；</div> <div>4.拦截器里的”/*”被改成其它的，比如”*.action”；</div> <div>3.struts Filter生效时，报Filter版本太旧</div> <div>将web.xml里的Filter改成示例中的配置方式</div> <div> </div> <div>4.Struts2与servlet共同部署，调用时报错</div> <div>只需要在struts.xml里增加下面内容即可</div> <constant name="struts.action.extension" value="action"></constant> <div> </div> <div>刚学简单配置了下遇到了这几个问题，还有问题我会继续更新解决办法…</div></div></div></div>

来源：oschina

链接：https://my.oschina.net/u/1391948/blog/189180

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错误分析