自己动手写web框架----2

浏览数：34 / 时间：2015年06月09日

在上一节,我们自己写的web框架,只能运行显示一个HelloWorld。现在我们对其进行一次加工,让他至少能运行一个登陆程序。
首先看login.jsp

<%@ page contentType="text/html; charset=UTF-8" language="java" import="java.sql.*" errorPage="" %>
<%@ page import="
    java.util.*,
    javax.servlet.*,
    javax.servlet.http.*,
    com.gc.action.User"%>
<%!public static final String _AppId = "login";%>
<%

    HashMap<String,Object> infoOut=null;
    if(request.getAttribute("infoOut") == null)
        infoOut=new HashMap<String,Object>();
    else
        infoOut=(HashMap<String,Object>)request.getAttribute("infoOut");

    String msg = infoOut.get("msg") == null ? "" : (String) infoOut
            .get("msg");
    User user = infoOut.get("user") == null ? new User()
            : (User) infoOut.get("user");
%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
"http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<title>采用新的框架实现用户登录验证</title>

<script language=Javascript>
function submit(target, action) {
    form1.target = target;   
    form1.action.value = action;
    form1.submit();
}


function check() {
    form1.forwardJsp.value="login"; //再次跳转回来
    form1.logicName.value="LoginAction";
    submit(‘<%="login_" + session.getId()%>‘,‘login‘);
}
</script>
</head>
<body leftmargin="0" topmargin="0">
               <%-- 这个action 目前没有用 我们可以随意写 --%>
    <form name="form1" action="xx.do"  method="post">
        <H3>
            <font color=‘red‘><%=msg%></font>
        </H3>


                用户名：<input type="text" name="username"><br> <br> 
                密码： <input type="text" name="password">
                    <br> 
                <input type="button" name="button" value="提交" onClick="return check()">
                <input type="reset" name="button" value="重置"> 

                <%-- 这一次我们要从jsp端发起请求,设置三个参数 --%>
                <input type="hidden" name="action" value=""> 
                <input type="hidden" name="forwardJsp" value="">
                <input type="hidden" name="logicName"   value="">
    </form>



<script language=Javascript>
    window.name = "<%="login_"+session.getId()%>";
</script>

</body>
</html>

表现层有了,控制层我们可以复用第一节的GdServlet,现在就差模型层了。

package com.gc.action;

import java.util.HashMap;


import com.gd.action.Action;

public class LoginAction implements Action{

    public HashMap<String, Object> doAction(HashMap<String, Object> infoIn) {
        String action = (infoIn.get("action") == null) ? "" : (String) infoIn
                .get("action");
        HashMap<String, Object> infoOut = infoIn;
        if (action.equals(""))
            infoOut = this.doInit(infoIn);
        else if (action.equals("login"))
            infoOut = this.doLogin(infoIn);
        return infoOut;
    }
    /**该方法用来实现没有传入动作时要处理的内容
    * @param infoIn
    * @return HashMap
    */

    private HashMap<String, Object> doInit(HashMap<String, Object> infoIn) {
        HashMap<String, Object> infoOut = infoIn;
        infoOut.put("msg", "请输入用户名和密码");
        return infoOut;
    }

    /**该方法用来实现输出HelloWorld
    * @param infoIn
    * @return HashMap
    */

    public HashMap<String, Object> doLogin(HashMap<String, Object> infoIn){
        HashMap<String, Object> infoOut = infoIn;
        String username = (infoIn.get("username") == null) ? "" : (String)infoIn.get("username");
        String password = (infoIn.get("password") == null) ? "" : (String)infoIn.get("password");


            if ("gd".equals(username) && "123456".equals(password)) {
                infoOut.put("forwardJsp", "success"); 
                infoOut.put("msg", "登录成功");
            } else if ("gd".equals(username) && !"123456".equals(password)) {
                infoOut.put("msg", "密码错误");
            } else if (!"gd".equals(username) && "123456".equals(password)) {
                infoOut.put("msg", "用户名错误");
            }  else if (!"gd".equals(username) && !"123456".equals(password)) {
                infoOut.put("msg", "用户名和密码都输入错误");
            } else if ("".equals(username) && "".equals(password)) {
                infoOut.put("msg", "请输入用户名和密码");
            }

            return infoOut;

    }
}

infoOut.put(“forwardJsp”, “success”);
如果登陆成功,就返回success.jsp。
注意:本来forwardJsp在login.jsp里就设置了,是login。这里的逻辑是一旦成功登陆,就返回success。
success.jsp

<%@ page contentType="text/html; charset=GBK" language="java" import="java.sql.*" errorPage="" %>
<%@ page import="java.sql.*,java.util.*,javax.servlet.*,
         javax.servlet.http.*,java.text.*,java.math.*,com.gd.mvc.io.InfoInAndOut,com.gd.mvc.io.impl.GdInfoInAndOut"
%>
<%! public static final String _AppId = "login"; %>
<%
HashMap<String,Object> infoOut=null;
if(request.getAttribute("infoOut") == null)
    infoOut=new HashMap<String,Object>();
else
    infoOut=(HashMap<String,Object>)request.getAttribute("infoOut");
    String msg = infoOut.get("msg") == null ? "" : (String)infoOut.get("msg");      
%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
"http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<title>采用新的框架实现用户注册验证</title>

</head>
<body leftmargin="0" topmargin="0">
<form name="form1" action="/myApp/do" method="post">
<H3><font color=‘red‘><%=msg%></font><H3>

    <input type="hidden" name="action" value="">
</form>
<script language=Javascript>
    window.name = "<%="login_"+session.getId()%>";     
</script>
</body>
</html>