jsp---》》》新闻发布系统的项目跟踪+++++++文件上传

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");
               }
           }
        }
    }
%>