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晴云秋月 2017-04-18
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#登录Servlet：LoginServlet.java
package com.demo;
import java.io.*;
import javax.servlet.*;
import javax.servlet.http.*;
import javax.servlet.http.HttpSession;
import javax.servlet.annotation.WebServlet;
@WebServlet(name = "LoginServlet",urlPatterns = {"/login.do"})
public class LoginServlet extends HttpServlet{
public void doPost(HttpServletRequest request,HttpServletResponse response)
throws ServletException,IOException{
HttpSession session = request.getSession();
String username = request.getParameter("username");
String password = request.getParameter("password");
//用户名、口令均为admin，认为登录成功
if(username.equals("admin")&&password.equals("admin")){
session.setAttribute("username", username);
RequestDispatcher rd = request.getRequestDispatcher("/up_down.jsp");
rd.forward(request, response);
}else{
RequestDispatcher rd = request.getRequestDispatcher("/login.jsp");
rd.forward(request, response);
}
}
}
#登录jsp页面：login.jsp
<%@ page contentType = "text/html;charest = UTF-8"
pageEncoding = "UTF-8"%>
<html>
<head><title>登录页面</title>
</head>
<body>
<form action = "login.do" method = "Post">
<table>
<tr><td>用户名：</td>
<td><input type = "text" name = "username"/></td>
</tr>
<tr><td>密 码：</td>
<td><input type ="password" name = "password"/></td>
</tr>
<tr><td><input type = "submit" value = "登录"/></td>
<td><input type = "reset" value = "取消"/></td>
</tr>
</table>
</form>
</body>
</html>
晴云秋月 2017-04-18
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#上传下载链接页面：up_down.jsp
<%@ page contentType = "text/html;charset = UTF-8" pageEncoding="UTF-8"%>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html;charset = UTF-8">
<title>up_down.jsp</title>
</head>
<body>
<h4><a href = "fileDownload.do">下载</a></h4>
<h4><a href = "fileUpload.jsp">上传</a></h4>
</body>
</html>
#下载Servlet：FileDownloadServlet.java
package com.demo;
import java.io.*;
import javax.servlet.*;
import javax.servlet.http.*;
import javax.servlet.annotation.WebServlet;
@WebServlet("/fileDownload.do")
public class FileDownloadServlet extends HttpServlet{
public void doGet(HttpServletRequest request,HttpServletResponse response)
throws ServletException,IOException{
HttpSession session = request.getSession();
if(session.getAttribute("username")==null){
request.getRequestDispatcher("/login.jsp").forward(request, response);
}else{
//设置文件的内容类型
response.setContentType("image/gif");
//设置Content-Disposition响应头，指定文件名
response.setHeader("Content-Disposition", "attachment;filename = duke.gif");
//获得输出流对象
OutputStream os = response.getOutputStream();
ServletContext context = getServletContext();
//返回输入流对象
InputStream is = context.getResourceAsStream("/files/duke.gif");
byte[] bytearray = new byte[1024];
int bytesread = 0;
//从输入流中读取1KB，然后写到输出流中
while((bytesread = is.read(bytearray)) != -1){
//将数据发送到客户端
os.write(bytearray, 0, bytesread);
}
os.flush();
is.close();
}
}
}
晴云秋月 2017-04-18
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#上传Servlet：FileUploadServlet.java
package com.demo;
import java.io.*;
import javax.servlet.*;
import javax.servlet.http.*;
import javax.servlet.annotation.*;
@WebServlet(name = "FileUploadServlet",urlPatterns = {"/fileUpload.do"})
@MultipartConfig(location = "D:\\",fileSizeThreshold = 1024)
public class FileUploadServlet extends HttpServlet{
public void doPost(HttpServletRequest request,HttpServletResponse response)
throws ServletException,IOException{
HttpSession session = request.getSession();
if(session.getAttribute("username")==null){
request.getRequestDispatcher("/login.jsp").forward(request, response);
}else{
//返回Web应用程序文档根目录
String path = this.getServletContext().getRealPath("/");
String mnumber = request.getParameter("mnumber");
Part p = request.getPart("fileName");
String message = "";
if(p.getSize() > 1024*1024){
p.delete();
message = "文件太大，不能上传！";
}else{
path = path + "\\member\\" + mnumber;
File f = new File(path);
if(!f.exists()){
f.mkdirs();
}
String h = p.getHeader("content-disposition");
String fname = h.substring(h.lastIndexOf("\\")+1, h.length()-1);
p.write(path + "\\" + fname);
message = "文件上传成功！";
}
request.setAttribute("message", message);
RequestDispatcher rd = request.getRequestDispatcher("/fileUpload.jsp");
rd.forward(request, response);
}
}
}
#上传jsp页面：fileUpload.jsp
<%@ page contentType = "text/html;charset = UTF-8" pageEncoding="UTF-8"%>
<html>
<head>
<meta http-equiv = "Content-Type" content = "text/html;charset = UTF-8">
<title>上传文件</title>
</head>
<body>
${massage}<br>
<form action = "fileUpload.do" enctype = "multipart/form-data" method = "post">
<table>
<tr><td colspan = "2" align = "center">文件上传</td>
</tr>
<tr><td>会员号：</td>
<td><input type = "text" name = "mnumber" size = "30"/></td>
</tr>
<tr><td>文件名：</td>
<td><input type = "file" name = "fileName" size = "30"/></td>
</tr>
<tr>
<td align = "right"><input type = "submit" value = "提交"/></td>
<td align = "left"><input type = "reset" value = "重置"/></td>
</tr>
</table>
</form>
</body>
</html>
