<form action="login.do" method="post">
			用户：<input type="text" name="username"><br>
			密码：<input type="password" name="password"></br>
			<input type="submit" value="登录">
		</form>

		  <servlet>
		    <servlet-name>action</servlet-name>
		    <servlet-class>org.apache.struts.action.ActionServlet</servlet-class>
		    <init-param>
		      <param-name>config</param-name>
		      <param-value>/WEB-INF/struts-config2.xml</param-value>
		    </init-param>
		    <init-param>
		      <param-name>debug</param-name>
		      <param-value>2</param-value>
		    </init-param>
		    <init-param>
		      <param-name>detail</param-name>
		      <param-value>2</param-value>
		    </init-param>
		    <load-on-startup>2</load-on-startup>
		  </servlet>
		
		
		  <!-- Standard Action Servlet Mapping -->
		  <servlet-mapping>
		    <servlet-name>action</servlet-name>
		    <url-pattern>*.do</url-pattern>
		  </servlet-mapping>  
		</web-app>

		<struts-config>
			<form-beans>
				<form-bean name="loginForm" type="com.bjpowernode.struts.LoginActionForm"/>
			</form-beans>
			
			<action-mappings>
				<action path="/login" 
						type="com.bjpowernode.struts.LoginAction"
						name="loginForm"		
						scope="request"		
						>
					<forward name="success" path="/login_success.jsp" />
					<forward name="error" path="/login_error.jsp"/>		
				</action>
			</action-mappings>
		</struts-config>

		public class LoginAction extends Action {  
		  
		    @Override  
		    public ActionForward execute(ActionMapping mapping, ActionForm form,  
		            HttpServletRequest request, HttpServletResponse response)  
		            throws Exception {  
		         UserActionForm  userForm=(UserActionForm)form;  
		         String userName=userForm.getName();  
		         int password=userForm.getPassword();            
		         UserManage userManage=new UserManage();
		         User user=new User();  
		          user.setName(userName);  
		          user.setPassword(password);  
		    
		        try {  
		             userManage.ValidateUser(user);  
		             return mapping.findForward("success");  
		          } catch (UserNotFoundException e) {  
		             e.printStackTrace();  
		             request.setAttribute("message", e.getMessage());  
		          }catch(PasswordErrorException e){  
		             e.printStackTrace();  
		             request.setAttribute("message", e.getMessage());  
		          }  
		    
		          return mapping.findForward("fail"); }  

				public class UserActionForm extends ActionForm {  
				    private String name;  
				    private int password;  
				    public String getName() {  
				        return name;  
				    }  
				    public void setName(String name) {  
				        this.name = name;  
				    }  
				    public int getPassword() {  
				        return password;  
				    }  
				    public void setPassword(int password) {  
				        this.password = password;  
				    }  
				      
				} 
				

				public class UserManage {  
				      
				     public void ValidateUser(User user) {  
				      // 判断用户名密码是否正确  
				      if (!"admin".equals(user.getName())) {  
				          throw new UserNotFoundException("用户不存在！用户名为：" + user.getName());  
				      } else if (user.getPassword() != 123456) {  
				         throw new PasswordErrorException("密码错误");  
				      }  
				 }} 

　A、初始化设置

　B、发送和接收请求

　C、处理和分发请求