先来一个分层架构图：
WeebRoot目录下的页面：
现在，此项目以实现登录，注销，新闻列表，编辑主题》》》》
先来登录部分的关键代码
index.jsp中的代码
userInfoServlet中的全部代码：
package cn.news.Servlet;
import java.io.IOException;
import java.io.PrintWriter;
import java.sql.SQLException;
import java.util.ArrayList;
import java.util.List;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import cn.news.dao.INewsDAO;
import cn.news.dao.impl.NewsInfoDAOImpl;
import cn.news.entity.NewsInfo;
import cn.news.entity.UserInfo;
import cn.news.service.INewsInfoService;
import cn.news.service.IUserInfoService;
import cn.news.service.impl.NewInfoServiceImpl;
import cn.news.service.impl.UserInfoServiceImpl;
public class UserInfoServlet extends HttpServlet {
public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
doPost( request, response);
}
public void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
//准备新闻数据
/*INewsInfoService newsservice =new NewInfoServiceImpl();
try {
List<NewsInfo> list=newsservice.getAllNews();
//放入request作用域
request.setAttribute("newsList", list);
} catch (SQLException e) {
}*/
INewsDAO dao=new NewsInfoDAOImpl();
List<NewsInfo> list=null;
try {
list = dao.getAllNews();
//System.out.println(list.size());
request.setAttribute("newsList", list);
} catch (SQLException e1) {
e1.printStackTrace();
}
String action=request.getParameter("action");
if("logout".equals(action)){
//执行注销
//第一步：先清除session
request.getSession().removeAttribute("uname");
//第二步：跳转到index.jsp（登录页面）
/*response.sendRedirect("/NewsManagerSystem/index.jsp");*/
request.getRequestDispatcher("/index.jsp").forward(request, response);
}else if("login".equals(action)){
//code write here
//1.解决乱码
request.setCharacterEncoding("utf-8");
//2.解析前台传递的表单数据
String uname=request.getParameter("uname");
String upwd=request.getParameter("upwd");
//拼接成一个用户对象
UserInfo info=new UserInfo();
info.setUname(uname);
info.setUpwd(upwd);
IUserInfoService service=new UserInfoServiceImpl();
try {
boolean flag = service.isLogin(info);
if (flag) { //登录成功
//3.记录session
request.getSession().setAttribute("uname", uname);
//4.转发或者重定向 转发不需要加项目名称
request.getRequestDispatcher("/newspages/admin.jsp").forward(request, response);
}else {
response.sendRedirect("/NewsManagerSystem/index.jsp");
}
} catch (SQLException e) {
e.printStackTrace();
}
}else{
//第一次访问首页
request.getRequestDispatcher("/index.jsp").forward(request,response);
}
}
}
TopicServlet中的代码
package cn.news.Servlet; import java.io.IOException; import java.io.PrintWriter; import java.sql.SQLException; import java.util.List; import javax.servlet.ServletException; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import cn.news.dao.impl.TopicDAOImpl; import cn.news.entity.Topic; import cn.news.service.ITopicService; import cn.news.service.impl.TopicServiceImpl; public class TopicServlet extends HttpServlet { public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { doPost(request, response); } public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { //调度Topic的service ITopicService service=new TopicServiceImpl(); try { List<Topic> list=service.getAllTopic(); request.setAttribute("topiclist", list); //System.out.println(list.size()); //转发到列表页 request.getRequestDispatcher("/newspages/topic_list.jsp").forward(request, response); } catch (SQLException e) { } } }
topic_list中的代码
文件上传
需要用到commons-fileupload-1.3.2.jar和commons-io-2.5.jar两个jar文件
需求：点击提交上传文件
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<base href="<%=basePath%>">
</head>
<body>
<%=path %>
<form enctype="multipart/form-data" action="<%=path %>/test.jsp" method="post">
姓 名： <input name="username"/>
选择文件：<input type="file" name="myfile" />
<input type="submit" value="上传"/>
</form>
</body>
</html>
<%@page language="java" import="java.util.*" pageEncoding="UTF-8"%> <%@page import="java.io.File"%> <%@page import="org.apache.commons.fileupload.FileItem"%> <%@page import="org.apache.commons.fileupload.disk.DiskFileItemFactory"%> <%@page import="org.apache.commons.fileupload.servlet.ServletFileUpload"%> <% request.setCharacterEncoding("UTF-8"); //将用户传递过来的request中的内容解析出来，判定其类型，如果是常规的普通表单字段，执行处理方式一 //否则就代表的是文件域，那么执行处理方式二 //01.判定是普通表单，还是用来上传文件的表单 boolean flag= ServletFileUpload.isMultipartContent(request); if(flag){ //开始找到一个解析器，来解析请求中的各个项目 DiskFileItemFactory factory=new DiskFileItemFactory(); ServletFileUpload upload=new ServletFileUpload(factory);//解析器upload创建成功 List<FileItem> fileList=upload.parseRequest(request); //每一个FileItem都代表一个表单元素 Iterator<FileItem> myitor=fileList.iterator(); while(myitor.hasNext()){ FileItem item=myitor.next(); if(item!=null){ //对当前item进行验证，看它是普通表单还是上传用的文件域 if(item.isFormField()){//证明是普通的表单字段 //获取该表单元素的内容(value值) String name=item.getFieldName();//这是表单元素的name属性，而不是value值 if(name.equals("username")){ out.print(item.getString("UTF-8")); } }else{ //是一个文件域 String fileName=item.getName();//ef.doc //扔到服务器的目录下 String path="/WEB-INF/upload";//文件上传不能用相对路径 //将相对路径转换成绝对路径 String abosolutePath=this.getServletContext().getRealPath(path); File file=new File(fileName); File uploadFile=new File(abosolutePath,file.getName()); item.write(uploadFile); out.print("上传成功"); } } } } %>