使用JSP+Servlet实现文件的上传下载上传

<!DOCTYPE html >
<html>
<head>
<meta charset="UTF-8">
<title>使用JSP+Servlet实现文件的上传下载</title>
</head>
<script type="text/javascript" src="js/jquery-1.11.1.js"></script>
<body><h2>使用JSP+Servlet实现文件的上传下载</h2><form action="uploadServlet" method="post" enctype="multipart/form-data" >请选择文件：<input id="file" name="file" type="file" /><input type="submit" value="上传"  />${result}**这里一定要注意，表单的method一定要使用post方式，其它的就很简单了，至于${result}这种语句是EL表达式。**</form>下载：<a href="downloadServlet?filename=FileTest.txt">fileTest.txt</a> ${errorResult}
</body>
</html>

package com.dw.servlet;import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.RandomAccessFile;
import javax.servlet.RequestDispatcher;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;public class UploadServlet extends HttpServlet {private static final long serialVersionUID = 1L;public UploadServlet() {super();}protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {doPost(request,response);}protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {request.setCharacterEncoding("utf-8");response.setCharacterEncoding("utf-8");response.setContentType("text/html;charset=utf-8");//更改响应字符流使用的编码，还能告知浏览器用什么编码进行显示//从request中获取文本输入流信息InputStream fileSourceStream = request.getInputStream();String tempFileName = "F:/tempFile";//设置临时文件，保存待上传的文本输入流File tempFile = new File(tempFileName);//outputStram文件输出流指向这个tempFileFileOutputStream outputStream = new FileOutputStream(tempFile);//读取文件流byte temp[] = new byte[1024];int n;while(( n = fileSourceStream.read(temp)) != -1){outputStream.write(temp, 0, n);}outputStream.close();fileSourceStream.close();//获取上传文件的名称 RandomAccessFile randomFile = new RandomAccessFile(tempFile,"r");randomFile.readLine();  String str = randomFile.readLine();int start = str.lastIndexOf("=") + 2;int end = str.lastIndexOf("\"");String filename = str.substring(start, end);//定位文件指针到文件头randomFile.seek(0);long startIndex = 0;int i = 1;//获取文件内容的开始位置while(( n = randomFile.readByte()) != -1 && i <=4){if(n == '\n'){startIndex = randomFile.getFilePointer();i ++;}}startIndex = startIndex -1; //这里一定要减1，因为前面多读了一个，这里很容易忽略//获取文件内容结束位置randomFile.seek(randomFile.length());long endIndex = randomFile.getFilePointer();int j = 1;while(endIndex >=0 && j<=2){endIndex--;randomFile.seek(endIndex);if(randomFile.readByte() == '\n'){j++;}}//设置保存上传文件的路径String realPath =  "F:/file";File fileupload = new File(realPath);if(!fileupload.exists()){fileupload.mkdir();}File saveFile = new File(realPath,filename);RandomAccessFile randomAccessFile = new RandomAccessFile(saveFile,"rw");//根据起止位置从临时文件中读取文件内容randomFile.seek(startIndex);while(startIndex < endIndex){randomAccessFile.write(randomFile.readByte());startIndex = randomFile.getFilePointer();}//关闭输入输出流并 删除临时文件randomAccessFile.close();randomFile.close();tempFile.delete();request.setAttribute("result", "文件上传成功");RequestDispatcher dispatcher = request.getRequestDispatcher("index.jsp");dispatcher.forward(request, response);}
}

package com.dw.servlet;import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import javax.servlet.RequestDispatcher;
import javax.servlet.ServletException;
import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
public class DownloadServlet extends HttpServlet {private static final long serialVersionUID = 1L;public DownloadServlet() {super();}protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {request.setCharacterEncoding("utf-8");response.setCharacterEncoding("utf-8");//获取文件下载路径String path = "F:/file/";String filename = request.getParameter("filename");File file = new File(path + filename);if(file.exists()){//设置相应类型让浏览器知道用什么打开  用application/octet-stream也可以，看是什么浏览器response.setContentType("application/x-msdownload");//设置头信息response.setHeader("Content-Disposition", "attachment;filename=\"" + filename + "\"");InputStream inputStream = new FileInputStream(file);ServletOutputStream ouputStream = response.getOutputStream();byte b[] = new byte[1024];int n ;while((n = inputStream.read(b)) != -1){ouputStream.write(b,0,n);}//关闭流ouputStream.close();inputStream.close();}else{request.setAttribute("errorResult", "文件不存在,下载失败!");RequestDispatcher dispatcher = request.getRequestDispatcher("index.jsp");dispatcher.forward(request, response);}}protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {doGet(request,response);}}

https://github.com/zhanlong-dw/fileuploadanddownload

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