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大项目之网上书城（五）——主页（End）

程序员文章站 2022-07-09 21:36:33
今天终于把主页完成啦！给书加了图片，虽然图片严重不符，不够这都是小问题，现在还是测试阶段，到时候整理下数据库就行了。 同时终于加了登录页面，并把验证码移到了登录界面，注册页面就不需要了。 最后，加了个用户页面，不过目前只有退出账号功能233333 有的代码差点忘了放，直接在网页上编辑的内容，希望... ......

目录

大项目之网上书城（五）——主页（end）

不说了！日更啊！

主要改动

今天终于把主页完成啦！给书加了图片，虽然图片严重不符，不够这都是小问题，现在还是测试阶段，到时候整理下数据库就行了。

同时终于加了登录页面，并把验证码移到了登录界面，注册页面就不需要了。

最后，加了个用户页面，不过目前只有退出账号功能233333

1.主页（终于完成啦）

完整代码

<%@ page language="java" contenttype="text/html; charset=utf-8"
    pageencoding="utf-8"%>
<!doctype html>
<html>
<head>
<style>
li{
    float:left;
    width:100%;
    height:10%;
    font-size:16px;
    color:#8deeee;
}
</style>
<script type="text/javascript" src="${pagecontext.request.contextpath}/jquery-3.3.1/jquery-3.3.1.min.js"></script>
<script type="text/javascript" src="${pagecontext.request.contextpath}/bootstrap-3.3.7-dist/js/bootstrap.min.js"></script>
<script type="text/javascript" src="${pagecontext.request.contextpath}/client/js/index.js"></script>
<title>主页</title>
</head>
<body style="background-color:#bbb">
<!-- 调用头部页面 -->
<div style="width:100%;height:100px;float:left">
<jsp:include page="/client/head.jsp"></jsp:include>
</div>
<!-- 通用内容体大小 -->
<div style="width:70%;height:886px;float:left;margin-left:15%;">
<!-- 二级导航 -->
<jsp:include page="/client/head2.jsp"></jsp:include>    
<!-- 图书分类and轮播图and文案and热门推荐and新书上架and新书榜 -->
<div style="width:100%;height:800px;float:left;margin-top:2%;background-color:#bbb;">
<!-- 图书分类 -->
<div style="width:23%;height:100%;float:left;background-color:#a8f;">
    <div style="width:100%;height:6%;text-align:center;line-height:45px;background-color:#556b2f">
        <font color="#ddd" style="font-size:20px;">图书分类</font>
    </div>
    <div style="width:100%;height:94%;text-align:center;line-height:45px;background-color:#548b54">
        <ul style="width:100%;height:100%;text-align:left;">
            <li>
                <a href="${pagecontext.request.contextpath }/client/pai/index.jsp">好书拍卖</a>
            </li>
            <li>
                <a href="${pagecontext.request.contextpath }/client/net_literature/index.jsp">网络文学</a>
            </li>
            <li>
                <a href="${pagecontext.request.contextpath }/client/clothing/index.jsp">服装</a>
            </li>
            <li>
                <a href="${pagecontext.request.contextpath }/client/sport/index.jsp">运动户外</a>
            </li>
            <li>
                <a href="${pagecontext.request.contextpath }/client/nursery/index.jsp">孕婴童</a>
            </li>
            <li>
                <a href="${pagecontext.request.contextpath }/client/nursery/index.jsp">孕婴童</a>
            </li>
            <li>
                <a href="${pagecontext.request.contextpath }/client/food/index.jsp">食品</a>
            </li>
            <li>
                <a href="#">暂无分类</a>
            </li>
            <li>
                <a href="#">暂无分类</a>
            </li>
            <li>
                <a href="#">暂无分类</a>
            </li>
        </ul>
    </div>  
</div>
<!-- 轮播图 -->
<div style="width:50%;height:35%;float:left;margin-left:2%;background-size:100% 100%;"id="lun">
    <!-- table按钮沉底大法！ -->
    <table style="width:100%;height:100%">
        <tr>
            <td style="vertical-align:bottom;">
                <button class="btn btn-warning" style="width:30px;height:30px;float:left;margin-left:60%;" id="l1">1</button>
                <button class="btn btn-warning" style="width:30px;height:30px;float:left;margin-left:2%;" id="l2">2</button>
                <button class="btn btn-warning" style="width:30px;height:30px;float:left;margin-left:2%;" id="l3">3</button>
                <button class="btn btn-warning" style="width:30px;height:30px;float:left;margin-left:2%;" id="l4">4</button>
            </td>
        </tr>
    </table>
</div>
<!-- 文案and热门推荐 -->
<div style="width:23%;height:35%;float:left;background-color:#bbb;margin-left:2%">
<!-- 文案 -->
<div style="width:100%;height:30%;float:left;background-color:#548b54;">
    <font style="font-size:20px;text-align:center;display:block;width:100%;color:#ee4000">618年中狂欢</font>
    <font style="display:block;color:#eead0e">十万童书，每满100减50</font>
    <font style="display:block;color:#eead0e">艺术绘画，每满100减50</font>
</div>
<!-- 热门推荐 -->
<div style="width:100%;height:64%;float:left;background-color:#a8f;margin-top:8%">
    <div style="width:100%;height:25%;text-align:center;line-height:45px;background-color:#556b2f">
        <font color="#ddd" style="font-size:20px;">热门推荐</font>
    </div>
    <div style="width:100%;height:75%;text-align:center;line-height:45px;background-color:#548b54;margin-top:-5%;">
        <ul>
            <li style="text-align:left;color:black"><font id="a1"></font><font id="remen1" style="font-size:8px"></font></li>
            <li style="text-align:left;color:black"><font id="a2"></font><font id="remen2" style="font-size:8px"></font></li>
        </ul>
        <div style="width:100%;height:20%;float:left;margin-top:5%">
            <button class="btn btn-info" style="float:left;margin-left:20%;font-size:8px;"id="b1">1</button>
            <button class="btn btn-info" style="float:left;margin-left:4%;font-size:8px;"id="b2">2</button>
            <button class="btn btn-info" style="float:left;margin-left:4%;font-size:8px;"id="b3">3</button>
            <button class="btn btn-info" style="float:left;margin-left:4%;font-size:8px;"id="b4">4</button>
        </div>
    </div>
</div>
</div>
<!-- 新书上架 -->
<div style="width:50%;height:63%;float:left;background-color:#a8f;margin-left:2%;margin-top:2%;"id="xinshu">
<table border="1"style="width:100%;height:100%">
    <tr>
        <td style="width:33%">
            <div style="width:94%;height:80%;background-color:white;margin-left:3%;float:left">
                <img alt="图书" src="${pagecontext.request.contextpath}/xinshuimg?shu=1" style="width:100%;"/>
            </div>
            <div style="width:94%;float:left;margin-left:3%;height:15%;">
                <font style="font-size:16px;margin-left:3%;"id="shu1">图书</font>
                <font style="font-size:8px"id="re1"></font>
            </div>
        </td>
        <td style="width:33%">
            <div style="width:94%;height:80%;background-color:white;margin-left:3%;float:left">
                <img alt="图书" src="${pagecontext.request.contextpath}/xinshuimg?shu=2" style="width:100%;"/>
            </div>
            <div style="width:94%;float:left;margin-left:3%;height:15%;">
                <font style="font-size:16px;margin-left:3%;"id="shu2">图书</font>
                <font style="font-size:8px"id="re2"></font>
            </div>
        </td>
        <td style="width:33%">
            <div style="width:94%;height:80%;background-color:white;margin-left:3%;float:left">
                <img alt="图书" src="${pagecontext.request.contextpath}/xinshuimg?shu=3" style="width:100%;"/>
            </div>
            <div style="width:94%;float:left;margin-left:3%;height:15%;">
                <font style="font-size:16px;margin-left:3%;"id="shu3">图书</font>
                <font style="font-size:8px"id="re3"></font>
            </div>
        </td>
    </tr>
    <tr>
        <td style="width:33%">
            <div style="width:94%;height:80%;background-color:white;float:left;margin-left:3%">
                <img alt="图书" src="${pagecontext.request.contextpath}/xinshuimg?shu=4" style="width:100%;"/>
            </div>
            <div style="width:94%;float:left;margin-left:3%;height:15%;">
                <font style="font-size:16px;margin-left:3%;"id="shu4">图书</font>
                <font style="font-size:8px"id="re4"></font>
            </div>
        </td>
        <td style="width:33%">
            <div style="width:94%;height:80%;background-color:white;margin-left:3%;float:left">
                <img alt="图书" src="${pagecontext.request.contextpath}/xinshuimg?shu=5" style="width:100%;"/>
            </div>
            <div style="width:94%;float:left;margin-left:3%;height:15%;">
                <font style="font-size:16px;margin-left:3%;"id="shu5">图书</font>
                <font style="font-size:8px"id="re5"></font>
            </div>
        </td>
        <td style="width:33%">
            <div style="width:94%;height:80%;background-color:white;margin-left:3%;float:left">
                <img alt="图书" src="${pagecontext.request.contextpath}/xinshuimg?shu=6" style="width:100%;"/>
            </div>
            <div style="width:94%;float:left;margin-left:3%;height:15%;">
                <font style="font-size:16px;margin-left:3%;"id="shu6">图书</font>
                <font style="font-size:8px"id="re6"></font>
            </div>
        </td>
    </tr>
    <tr>
        <td style="width:33%">
            <div style="width:94%;height:80%;background-color:white;margin-left:3%;float:left">
                <img alt="图书" src="${pagecontext.request.contextpath}/xinshuimg?shu=7" style="width:100%;"/>
            </div>
            <div style="width:94%;float:left;margin-left:3%;height:15%;">
                <font style="font-size:16px;margin-left:3%;"id="shu7">图书</font>
                <font style="font-size:8px"id="re7"></font>
            </div>
        </td>
        <td style="width:33%">
            <div style="width:94%;height:80%;background-color:white;margin-left:3%;float:left">
                <img alt="图书" src="${pagecontext.request.contextpath}/xinshuimg?shu=8" style="width:100%;"/>
            </div>
            <div style="width:94%;float:left;margin-left:3%;height:15%;">
                <font style="font-size:16px;margin-left:3%;"id="shu8">图书</font>
                <font style="font-size:8px"id="re8"></font>
            </div>
            
        </td>
        <td style="width:33%">
            <div style="width:94%;height:80%;background-color:white;margin-left:3%;float:left">
                <img alt="图书" src="${pagecontext.request.contextpath}/xinshuimg?shu=9" style="width:100%;"/>
            </div>
            <div style="width:94%;float:left;margin-left:3%;height:15%;">
                <font style="font-size:16px;margin-left:3%;"id="shu9">图书</font>
                <font style="font-size:8px"id="re9"></font>
            </div>
        </td>
    </tr>
</table>
</div>
<!-- 新书榜 -->
<div style="width:23%;height:63%;float:left;background-color:#a8f;margin-left:2%;margin-top:2%;">
    <div style="width:100%;height:10%;text-align:center;line-height:45px;background-color:#556b2f">
        <font color="#ddd" style="font-size:20px;">新书排行榜</font>
    </div>
    <div style="width:100%;height:90%;text-align:center;line-height:45px;background-color:#548b54;">
        <ul style="width:100%;height:90%;float:left;">
            <li style="text-align:left;color:black"><font id="x1"></font><font id="r1" style="font-size:8px"></font></li>
            <li style="text-align:left;color:black"><font id="x2"></font><font id="r2" style="font-size:8px"></font></li>
            <li style="text-align:left;color:black"><font id="x3"></font><font id="r3" style="font-size:8px"></font></li>
            <li style="text-align:left;color:black"><font id="x4"></font><font id="r4" style="font-size:8px"></font></li>
            <li style="text-align:left;color:black"><font id="x5"></font><font id="r5" style="font-size:8px"></font></li>
            <li style="text-align:left;color:black"><font id="x6"></font><font id="r6" style="font-size:8px"></font></li>
            <li style="text-align:left;color:black"><font id="x7"></font><font id="r7" style="font-size:8px"></font></li>
            <li style="text-align:left;color:black"><font id="x8"></font><font id="r8" style="font-size:8px"></font></li>
            <li style="text-align:left;color:black"><font id="x9"></font><font id="r9" style="font-size:8px"></font></li>
        </ul>
            <div style="width:100%;height:10%;float:left;">
                <button class="btn btn-info" style="float:left;margin-left:20%;font-size:8px;"id="b5">1</button>
                <button class="btn btn-info" style="float:left;margin-left:4%;font-size:8px;"id="b6">2</button>
                <button class="btn btn-info" style="float:left;margin-left:4%;font-size:8px;"id="b7">3</button>
                <button class="btn btn-info" style="float:left;margin-left:4%;font-size:8px;"id="b8">4</button>
            </div>
    </div>
</div>
</div>
</div>
<!-- 调用底部页面 -->
<div style="width:100%;height:60px;float:left">
<jsp:include page="/client/foot.jsp"></jsp:include>
</div>
</body>
</html>

效果图

大项目之网上书城（五）——主页（End）

2.head.jsp的小改动

给我的账号加了个判断，如果已经登录了，就显示为你的用户名，可跳转到你的个人主页。否则显示“我的账号”，可跳转到登录界面。恩，悄悄给bookstore字样做了个到主页的跳转~

代码

<%@ page language="java" contenttype="text/html; charset=utf-8"
    pageencoding="utf-8"%>
<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %>
<!doctype html>
<html>
<head>
<title>insert title here</title>
<!-- 这里的href请写自己的bootstrap的css的链接。如果没有下载，可以用这个 -->
<!-- https://cdn.jsdelivr.net/npm/bootstrap@3.3.7/dist/css/bootstrap.min.css -->
<link rel="stylesheet" href="${pagecontext.request.contextpath }/bootstrap-3.3.7-dist/css/bootstrap.min.css">
<style type="text/css">
@font-face{
  font-family: myfont;
  src: url("${pagecontext.request.contextpath }/bootstrap-3.3.7-dist/fonts/adventure-normal.ttf");
}
a:link {text-decoration:none;color: black} /* 未访问的链接 */
a:visited {text-decoration:none;color: black} /* 已访问的链接 */
a:hover {text-decoration:none;color: #068} /* 鼠标移动到链接上 */
a:active {text-decoration:none;color: #068} /* 选定的链接，即鼠标按下去的时候不松开显示的状态 */
a{
    font-size:18px;
}
</style>
</head>
<body>
<div style="height:100px;width:100%;float:left">
    <!-- bookstore字样 -->
    <div style="line-height:120px;height:100px;width:45%;margin-left:15%;float:left">
        <a href="${pagecontext.request.contextpath }/client/index.jsp"><font face="myfont" color = "black" style="font-size:60px">bookstore</font></a>
    </div>
    <!-- 导航栏 -->
    <div style="height:100px;width:25%;float:left;margin-right:15%">
        <div style="height:100px;width:25%;float:left;padding-top:40px">
            <a href="#"><span class="glyphicon glyphicon-shopping-cart"></span>购物车</a>
        </div>
        <div style="height:100px;width:25%;float:left;padding-top:40px">
        <a href="#">帮助中心</a>
        </div>
        <div style="height:100px;width:25%;float:left;padding-top:40px">
            <c:if test="${sessionscope.user==null}" var="f">
                <a href="${pagecontext.request.contextpath }/client/login.jsp">我的账户</a>
            </c:if>
            <c:if test="${!f }">
                <a href="${pagecontext.request.contextpath }/client/user.jsp">${sessionscope.user.username }</a>
            </c:if>
        </div>
        <div style="height:100px;width:25%;float:left;padding-top:40px">
            <a href="${pagecontext.request.contextpath }/client/register.jsp">用户注册</a>
        </div>
    </div>
</div>
</body>
</html>

3.login.jsp

###代码

<%@ page language="java" contenttype="text/html; charset=utf-8"
    pageencoding="utf-8"%>
<!doctype html>
<html>
<head>
<title>登录</title>
<!-- 这里的href请写自己的bootstrap的css的链接。如果没有下载，可以用这个 -->
<!-- https://cdn.jsdelivr.net/npm/bootstrap@3.3.7/dist/css/bootstrap.min.css -->
<link rel="stylesheet" href="${pagecontext.request.contextpath }/bootstrap-3.3.7-dist/css/bootstrap.min.css">
<!-- jquery和bootstrap的链接可以用下面的 -->
<!-- https://cdn.jsdelivr.net/npm/jquery@1.12.4/dist/jquery.min.js -->
<!-- https://cdn.jsdelivr.net/npm/bootstrap@3.3.7/dist/js/bootstrap.min.js -->
<script type="text/javascript" src="${pagecontext.request.contextpath}/jquery-3.3.1/jquery-3.3.1.min.js"></script>
<script type="text/javascript" src="${pagecontext.request.contextpath}/bootstrap-3.3.7-dist/js/bootstrap.min.js"></script>
<!-- login.js是我自己写的，里面放了判断输入是否合理，以及验证码的正确与否的。之后放上了。 -->
<script type="text/javascript" src="${pagecontext.request.contextpath}/client/js/login.js"></script>
</head>
<body style="background-color:#bbb">
<font size="7" style="color:red;">${errormsg }</font>
<!-- 调用头部页面 -->
<div style="width:100%;height:100px;float:left">
<jsp:include page="head.jsp"></jsp:include>
</div>
<!-- 通用内容体大小 -->
<div style="width:70%;height:720px;float:left;margin-left:15%;">
    <!-- 好看的图 -->
    <div style="width:55%;height:100%;float:left;margin-top:10%;">
        <img alt="拿书男孩" src="${pagecontext.request.contextpath }/client/img/boy.jpg" style="width:90%;">
    </div>
    <!-- 登录界面 -->
    <div style="width:45%;height:80%;float:left;margin-top:7%">
        <h1 style="color:#8b6914;text-align:center">用户登录</h1>
        <hr style="height:2px;border:none;border-top:5px ridge green;" />
        <form action="${pagecontext.request.contextpath }/login" method="post" class="form-horizontal" role="form">
            <div class="form-group">
                <label for="lastname" class="col-sm-3 control-label input-lg">昵称</label>
                <div class="col-sm-9">
                    <input type="text" name="username" id="username" class="form-control input-lg"
                           placeholder="请输入昵称" style="float:left"/>
                </div>
            </div>
            <div class="form-group">
                <label for="firstname" class="col-sm-3 control-label input-lg">密码</label>
                <div class="col-sm-9">
                    <input type="password" name="password" id="password" 
                    class="form-control input-lg" placeholder="请输入密码" style="float:left"/>
                </div>
            </div>
            
            <div class="form-group">
                <label for="firstname" class="col-sm-3 control-label input-lg">验证码</label>
                <div class="col-sm-9">
                    <input type="text" id="code"
                    class="form-control input-lg" placeholder="请输入验证码" style="width:45%;float:left"/>
                    <img src="${pagecontext.request.contextpath}/imagecode"
                    width="180"height="30"class="textinput"
                    style="height:42px;width:55%;"id="img"/>
                    <a href="javascript:void(0);"id="a1" >换一张</a>
                </div>
            </div>
            <div class="form-group">
                <label for="firstname" class="col-sm-1 control-label input-lg"></label>
                <div class="col-sm-5">
                    <input type="submit" name="submit" value="提交"
                    class="form-control input-lg btn btn-primary"style="width:100%;float:left"/>
                </div>
                <div class="col-sm-5">
                    <input type="reset" name="reset" value="重置" id="re"
                    class="form-control input-lg btn btn-warning"style="width:100%;float:left"/>
                </div>
            </div>
        </form>
        <span style="margin-left:10%">还没有帐号？请先<a href="${pagecontext.request.contextpath }/client/register.jsp">注册</a>！</span>
    </div>
</div>
<!-- 调用底部页面 -->
<div style="width:100%;height:60px;float:left">
<jsp:include page="foot.jsp"></jsp:include>
</div>
</body>
</html>

效果图

大项目之网上书城（五）——主页（End）

4.login.js

代码

因为貌似jquery的post提交是在其他代码结束之后才运行的，于是我取巧把二维码的验证和表单提交分开写了，个人认为也算是个不错的思路吧~

$(function(){
    var code;
    $.post("../checkcode",function(data){
        code=data;
    });
    $("#a1").click(function(){
        $("#img").attr("src","/bookstore/imagecode?time="+new date().gettime());
    });
    var flag;
    $("#code").keyup(function(){
        $.post("/bookstore/checkcode",function(data){
            code=data;
            if(code==$("#code").val()){
                flag=true;
            }
            else{
                flag=false;
            }
        });     
    });
    $("form").submit(function(){
        if(flag){
            return true;
        }else{
            alert("验证码错误");
            return false;
        }
    });
});

5.userserviceimpl的login方法

代码

个人感觉设计的还是挺精妙的，可以用一个函数就检测用户名是否存在，密码是否正确，同时也能在正确的时候返回user对象。

@override
    public object login(string username, string password) throws sqlexception {
        // todo auto-generated method stub
        user user = dao.finduserbyname(username);
        if(user==null) {
            return "user";
        }else {
            if(user.getpassword().equals(password)) {
                return user;
            }else {
                return "pass";
            }
        }
    }

6.loginservlet

代码

接收用户名密码，然后调用userservice的login方法，并对返回值做出相应处理。

package cn.edu.bdu.mc.servlets;

import java.io.ioexception;
import java.sql.sqlexception;

import javax.servlet.servletexception;
import javax.servlet.annotation.webservlet;
import javax.servlet.http.httpservlet;
import javax.servlet.http.httpservletrequest;
import javax.servlet.http.httpservletresponse;

import cn.edu.bdu.mc.beans.user;
import cn.edu.bdu.mc.services.userservice;
import cn.edu.bdu.mc.services.impls.userserviceimpl;

/**
 * servlet implementation class loginservlet
 */
@webservlet("/login")
public class loginservlet extends httpservlet {
    private static final long serialversionuid = 1l;
       
    /**
     * @see httpservlet#httpservlet()
     */
    public loginservlet() {
        super();
        // todo auto-generated constructor stub
    }

    /**
     * @see httpservlet#doget(httpservletrequest request, httpservletresponse response)
     */
    protected void doget(httpservletrequest request, httpservletresponse response) throws servletexception, ioexception {
        try {
            // todo auto-generated method stub
            string username = request.getparameter("username");
            string password = request.getparameter("password");
            userservice userservice = new userserviceimpl();
            object login = userservice.login(username, password);
            if(login.equals("user")) {
                request.setattribute("errormsg", "用户名不存在");
                request.getrequestdispatcher("client/login.jsp").forward(request, response);
            }else if(login.equals("pass")) {
                request.setattribute("errormsg", "密码错误");
                request.getrequestdispatcher("client/login.jsp").forward(request, response);
            }else {
                user user = (user) login;
                request.getsession().setattribute("user", user);
                response.sendredirect("client/index.jsp");
            }
        } catch (sqlexception e) {
            // todo auto-generated catch block
            e.printstacktrace();
        }
    }

    /**
     * @see httpservlet#dopost(httpservletrequest request, httpservletresponse response)
     */
    protected void dopost(httpservletrequest request, httpservletresponse response) throws servletexception, ioexception {
        // todo auto-generated method stub
        doget(request, response);
    }

}

7.user.jsp

代码

<%@ page language="java" contenttype="text/html; charset=utf-8"
    pageencoding="utf-8"%>
<!doctype html>
<html>
<head>
<title>空白</title>
</head>
<body style="background-color:#bbb">
<!-- 调用头部页面 -->
<div style="width:100%;height:100px;float:left">
<jsp:include page="/client/head.jsp"></jsp:include>
</div>
<!-- 通用内容体大小 -->
<div style="width:70%;height:720px;float:left;margin-left:15%;">
<a href="${pagecontext.request.contextpath }/logout">退出登录</a>
</div>
<!-- 调用底部页面 -->
<div style="width:100%;height:60px;float:left">
<jsp:include page="/client/foot.jsp"></jsp:include>
</div>
</body>
</html>

效果图

大项目之网上书城（五）——主页（End）

8.logoutservlet

移除session域中的user属性，然后跳转回主页。

package cn.edu.bdu.mc.servlets;

import java.io.ioexception;
import javax.servlet.servletexception;
import javax.servlet.annotation.webservlet;
import javax.servlet.http.httpservlet;
import javax.servlet.http.httpservletrequest;
import javax.servlet.http.httpservletresponse;

/**
 * servlet implementation class logoutservlet
 */
@webservlet("/logout")
public class logoutservlet extends httpservlet {
    private static final long serialversionuid = 1l;
       
    /**
     * @see httpservlet#httpservlet()
     */
    public logoutservlet() {
        super();
        // todo auto-generated constructor stub
    }

    /**
     * @see httpservlet#doget(httpservletrequest request, httpservletresponse response)
     */
    protected void doget(httpservletrequest request, httpservletresponse response) throws servletexception, ioexception {
        // todo auto-generated method stub
        request.getsession().removeattribute("user");
        response.sendredirect("client/index.jsp");
    }

    /**
     * @see httpservlet#dopost(httpservletrequest request, httpservletresponse response)
     */
    protected void dopost(httpservletrequest request, httpservletresponse response) throws servletexception, ioexception {
        // todo auto-generated method stub
        doget(request, response);
    }

}

9.bookservice的改动——添加图片

代码

差点忘了往上放这部分。。。

        @override
    public void addimg(int book_id, string path) throws sqlexception, ioexception {
        // todo auto-generated method stub
        dao.addimg(book_id, path);
    }

    @override
    public inputstream getimgbyid(int book_id) throws sqlexception {
        // todo auto-generated method stub
        return dao.getimgbyid(book_id);
    }
//好像应该看dao里的，，
/*
    @override
    public void addimg(int book_id, string path) throws sqlexception, ioexception {
        // todo auto-generated method stub
        connection conn = null;
        preparedstatement ps = null;
        fileinputstream in = null;
        in = new fileinputstream(new file(path));
        conn = jdbcutil.getconn();
        string sql = "update book set book_img = ? where book_id = ?";
        ps = conn.preparestatement(sql);
        ps.setbinarystream(1, in, in.available());
        ps.setint(2, book_id);
        int count = ps.executeupdate();
        if (count > 0) {
            system.out.println("插入成功！");
        } else {
            system.out.println("插入失败！");
        }
        jdbcutil.release(conn, ps);
    }

    @override
    public inputstream getimgbyid(int book_id) throws sqlexception {
        // todo auto-generated method stub
        connection conn = null;
        preparedstatement ps = null;
        resultset rs = null;
        inputstream in = null;
        try {
            conn = jdbcutil.getconn();
            string sql = "select book_img from book where book_id = ?";
            ps = conn.preparestatement(sql);
            ps.setint(1, book_id);
            rs = ps.executequery();
            while (rs.next()) {
                in = rs.getbinarystream("book_img");
            }
        } catch (exception e) {
            e.printstacktrace();
        }
        jdbcutil.release(conn, ps, rs);
        return in;
    }
*/
//注意，一定不要忘记释放连接，不然你网页卡半天也加载不出来图片。。。

总结

今天遇到的错误还挺多的，好在都解决得差不多了，主页终于完工了，然后今天其实打代码的时间比较少，啊，做不完啦做不完啦！好烦啊！

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