用servlet实现文件和图片的下载

最新推荐文章于 2025-07-28 14:23:08 发布

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本文介绍了一种使用Servlet实现文件及图片下载的方法。通过设置HTTP响应头并利用字节流进行传输，实现了从服务器到客户端的文件下载功能。

用servlet实现文件和图片的下载

package com.cdsxt.action;

import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.io.PrintWriter;

import javax.servlet.ServletContext;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

public class DownloadServlet extends HttpServlet {

	public void doGet(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {
		this.doPost(request, response);
	}

	public void doPost(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {
		//Content-Disposition	 attachment; filename="40Ò³ÕûÀíÓ¢ÓïËÄ¼¶µ¥´Ê´óÈ«.doc"
		
//		response.addHeader("content-type", "dfag/fdsaffdsa;charset=utf-8");
		//下载        两步  第一步   设置头信息   第二步  以流方式写出去
		ServletContext context=this.getServletContext();
//		InputStream in=context.getResourceAsStream("/file/英语四级.doc");
		String path=context.getRealPath("/file/girl.jpg");
		File file=new File(path);
		String nameStr=file.getName();
		String name=new String(nameStr.getBytes("utf-8"),"iso8859-1");
		FileInputStream in=new FileInputStream(file);
		response.addHeader("Content-Disposition", "attachment; filename="+name);
		
		OutputStream out=response.getOutputStream();
		byte[] b=new byte[8192];
		int temp=0;
		while((temp=in.read(b))!=-1){
			out.write(b, 0, temp);
		}
		out.flush();
		out.close();
		in.close();
	}

}