Java通过文件路径下载文件

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根据一个文件的路径，同时截取这个下载文件的文件名，把他从服务器上下载下来。

package com.fedex.servlet;import java.io.BufferedInputStream;import java.io.File;import java.io.FileInputStream;import java.io.IOException;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 downServlet extends HttpServlet {private static final long serialVersionUID = -4982148846155613840L;public void doGet(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {this.doPost(request, response);}public void doPost(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {String filePath = request.getParameter("filePath");//获得下载文件的路径String fileName=filePath.substring(filePath.lastIndexOf("\\")+1);//下载后设置的文件名if(null != filePath){File downloadFile = new File(filePath);if(downloadFile.exists()){response.setContentType("application/octet-stream");response.setHeader("Content-Disposition", "attachment; filename="+fileName);Long length = downloadFile.length();response.setContentLength(length.intValue());ServletOutputStream out = response.getOutputStream();FileInputStream is = new FileInputStream(downloadFile);BufferedInputStream bis = new BufferedInputStream(is);int size = 0;byte[] b = new byte[4096];while((size = bis.read(b)) != -1){out.write(b, 0, size);}bis.close();out.flush();out.close();}else{System.out.println("文件不存在!");}}}}

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