1.在tomcat的webapp中创建一个WEB工程myapp，具体的文件及路径如下所示：
①/webapp/myapp/login.jsp
②/webapp/myapp/welcom.jsp
③/webapp/myapp/error.jsp
④/webapp/myapp/WEB-INF/web.xml
⑤/webapp/myapp/WEB-INF/classes
⑥/webapp/myapp/WEB-INF/classes/struts.xml
⑦/webapp/myapp/WEB-INF/classes/test/LoginAction.class
⑧/webapp/myapp/WEB-INF/lib
2.在lib中添加如下jar文件：commons-fileupload-1.3.1、commons-io-2.2、commons-lang3-3.2、commons-logging-1.1.3、freemarker-2.3.19、javassist-3.11.0.GA、ognl-3.0.6、struts2-core-2.3.20、xwork-core-2.3.20（具体版本根据自己使用的Struts2的版本做调整）
3.源代码
#login.jsp
---------------------------------------------------------------------------------
<%@page language="java" contentType="text/html;charset=UTF-8"%>
<html>
<head>
<title>登陆页面</title>
</head>
<body>
<form action="Login.action" method="post">
<tablealign="center">
<caption><h3>登陆页面</h3></caption>
<tr>
<td>username<input type="text"name="username"/></td>
</tr>
<tr>
<td>password<input type="text"name="password"/></td>
</tr>
<tr>
<td colspan="2"><inputtype="submit" value="submit"/><inputtype="reset" value="reset" /></td>
</tr>
</table>
</form>
</body>
</html>
#welcome.jsp
---------------------------------------------------------------------------------------
<%@page language="java" contentType="text/html;charset=UTF-8"%>
<html>
<head>
<title>成功页面</title>
</head>
<body>
您已经登陆!
</body>
</html>
#error.jsp
--------------------------------------------------------------------------------
<%@page language="java" contentType="text/html;charset=UTF-8"%>
<html>
<head>
<title>失败页面</title>
</head>
<body>
登陆失败!
</body>
</html>
#LoginAction.java
-----------------------------------------------------------------------
packagetest;
public class LoginAction
{
private String username;
private String password;
public String getUsername()
{
return username;
}
public void setUsername(String username)
{
this.username = username;
}
public String getPassword()
{
return password;
}
public void setPassword(String password)
{
this.password = password;
}
public String execute() throws Exception
{
if (getUsername().equals("scott") &&getPassword().equals("tiger") )
{
return "success";
}
else
{
return "error";
}
}
}
4.web.xml配置
--------------------------------------------------------------------------------------
<?xmlversion="1.0" encoding="UTF-8"?>
<web-app id="WebApp_9" version="2.4" xmlns="http://java.sun.com/xml/ns/j2ee"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://java.sun.com/xml/ns/j2eehttp://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd">
<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>
</web-app>
5.Struts2.xml配置
--------------------------------------------------------------------------------------
<?xmlversion="1.0" encoding="UTF-8" ?>
<!DOCTYPE struts PUBLIC
"-//Apache Software Foundation//DTD Struts Configuration2.3//EN"
"http://struts.apache.org/dtds/struts-2.3.dtd">
<struts>
<constantname="struts.enable.DynamicMethodInvocation" value="false"/>
<constant name="struts.devMode"value="true" />
<package name="default" namespace="/"extends="struts-default">
<action name="Login"class="test.LoginAction" method="execute">
<resultname="success">/welcome.jsp</result>
<resultname="error">/error.jsp</result>
</action>
</package>
</struts>
6.常见问题
1）输入http://localhost:8080/myapp/login.jsp提示：HTTPStatus 404 - /myapp/login.jsp
主要原因可能有：①lib中的jar文件不够
②struts.xml中的package与action配置有误
2）login.jsp页面点击submit提交后提示空指针错误
主要原因可能有：①LoginAction没有包名，直接存放在了classes的根目录下