MappingSystemAction extends MappingDispatchAction

最新推荐文章于 2014-02-10 07:58:06 发布

最新推荐文章于 2014-02-10 07:58:06 发布 · 157 阅读

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#Struts #Apache #JSP #HTML #XML

struts1.2 专栏收录该内容

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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

<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>

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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>