MappingSystemAction extends MappingDispatchAction
MappingDispatchAction 类
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import org.apache.struts.action.ActionForm;
import org.apache.struts.action.ActionForward;
import org.apache.struts.action.ActionMapping;
import org.apache.struts.actions.MappingDispatchAction;
import com.tarena.biz.IllegalUserException;
import com.tarena.biz.UserBiz;
import com.tarena.entity.User;
/**
* 系统的核心功能,包括:
* 1)登录
* 2)退出
*
* MappingDispatchAction工作原理:
* 1)在配置的时候，为类中的每一个方法都指定一个<action>
* 通过parameter属性来指定方法的名称。
*
* 2)配置举例：
* <action parameter="login" path="/mapping/login" type="...MappingSystemAction">
* </action>
* <action parameter="logout" path="/mapping/logout" type="...MappingSystemAction">
* </action>
* 3)请求
* GET:
* <html:link action="/mapping/logout">logout</html:link>
* POST:
* <html:form action="/mapping/login">
* </html:form>
*/
public class MappingSystemAction extends MappingDispatchAction {
/**
* 系统的登录方法.
*/
public ActionForward login(ActionMapping mapping, ActionForm form,
HttpServletRequest request, HttpServletResponse response)
throws Exception {
ActionForward forward = null;
// 获取登录表单中的数据
UserForm userForm = (UserForm) form;
String userName = userForm.getUserName();
String password = userForm.getPassword();
// 创建模型(业务)对象
UserBiz userBiz = new UserBiz();
// 执行业务方法处理请求的数据
User user = null;
try {
user = userBiz.find(userName, password);
} catch (IllegalUserException e) {
e.printStackTrace();
throw e;
}
// 根据业务的执行结果跳转到下一个页面
if (user != null) {
HttpSession session = request.getSession();
session.setAttribute("user", user);
forward = mapping.findForward("success");
} else {
forward = mapping.findForward("fail");
}
return forward;
}
/**
* 系统的退出方法.
*/
public ActionForward logout(ActionMapping mapping, ActionForm form,
HttpServletRequest request, HttpServletResponse response)
throws Exception {
HttpSession session = request.getSession();
session.invalidate();
return mapping.findForward("login");
}
}
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UserForm类
package com.tarena.struts;
import org.apache.struts.validator.ValidatorForm;
@SuppressWarnings("serial")
public class UserForm extends ValidatorForm {
private String userName;
private String password;
public String getPassword() {
return password;
}
public void setPassword(String password) {
this.password = password;
}
public String getUserName() {
return userName;
}
public void setUserName(String userName) {
this.userName = userName;
}
}
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validation.xml
<?xml version="1.0" encoding="ISO-8859-1" ?>
<!DOCTYPE form-validation PUBLIC
"-//Apache Software Foundation//DTD Commons Validator Rules Configuration 1.1.3//EN"
"http://jakarta.apache.org/commons/dtds/validator_1_1_3.dtd">
<form-validation>
<formset>
<form name="userForm">
<field property="userName" depends="required">
<arg0 key="username" resource="false"/>
</field>
<field property="password" depends="required,minlength,maxlength">
<arg0 key="password" resource="false"/>
<arg1 key="${var:minlength}" resource="false" name="minlength"/>
<arg1 key="${var:maxlength}" resource="false" name="maxlength"/>
<var>
<var-name>minlength</var-name>
<var-value>5</var-value>
</var>
<var>
<var-name>maxlength</var-name>
<var-value>10</var-value>
</var>
</field>
</form>
</formset>
</form-validation>
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struts-config.xml
<action path="/mapping/login" type="MappingSystemAction"
name="userForm" parameter="login" input="/mapping/login.jsp">
<exception key="errors.illegaluser" type="IllegalUserException" path="/error.jsp" />
<forward name="success" path="/mapping/success.jsp" redirect="true"/>
<forward name="fail" path="/mapping/fail.jsp" />
</action>
<action path="/mapping/logout" type="MappingSystemAction" parameter="logout">
<forward name="login" path="/mapping/login.jsp" redirect="true" />
</action>
<message-resources parameter="ApplicationResources" />
<plug-in className="org.apache.struts.validator.ValidatorPlugIn">
<set-property
property="pathnames"
value="/WEB-INF/validator-rules.xml,/WEB-INF/validation.xml"/>
</plug-in>
<!-- validator-rules.xml 由struts系统给-->
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login.jsp
<%@page contentType="text/html;charset=gbk" %>
<%@taglib prefix="html" uri="http://struts.apache.org/tags-html"%>
<html>
<head>
<title>登录</title>
<html:javascript formName="userForm" />
</head>
<body>
<center>
<h3>欢迎使用本系统,请输入用户名和密码</h3>
<hr>
<html:form action="/mapping/login">
<%--
方法名已经在xml文件中说明
--%>
<table width="300" border="1" align="center">
<tr>
<td nowrap>用户名</td>
<td nowrap>
<html:text property="userName" />
</td>
</tr>
<tr>
<td nowrap>密码</td>
<td nowrap>
<html:password property="password" />
</td>
</tr>
</table>
<br>
<input type="submit" value="登录" onclick="return validateUserForm(this.form)">
</html:form>
<br>
<html:errors />
</center>
</body>
</html>
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success.jsp
<%@page contentType="text/html;charset=gbk" %>
<%@taglib prefix="html" uri="http://struts.apache.org/tags-html"%>
<html>
<head>
<title>成功</title>
</head>
<body>
<center>
<h3>登录成功</h3>
<hr>
welcome, ${user.userName}
<%--
方法名已经在xml文件中指定<action path="/mapping/logout" parameter="logout">
--%>
<html:link action="/mapping/logout">退出</html:link>
</center>
</body>
</html>
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fail.jsp
<%@page contentType="text/html;charset=gbk" %>
<html>
<head>
<title>失败</title>
</head>
<body>
<center>
<h3>对不起,用户名不存在或密码不正确</h3>
<hr>
<a href="javascript:history.back()">返回</a>
</center>
</body>
</html>