servlet下载含中文文件名文件

      今天项目中实现一个servlet下载文件的功能，保存文件时，文件名出现异常。

     

      研究了一下，做下记录。

       

      servlet代码:

        package com.my.servlet;

import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;

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 {
	public void doGet(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {
		String path = getServletContext().getRealPath("/") + "/doc";
		
		String fileName =java.net.URLDecoder.decode(request.getParameter("filename"),"UTF-8");
		File file = new File(path + "/" + fileName);
		// 如果文件存在
		if (file.exists()) {
			// 设置响应类型及响应头
			response.setContentType("application/x-msdownload");
			response.setCharacterEncoding("UTF-8");
			response.setHeader("Content-Disposition", "attachment; filename=\""
					+ new String(fileName.getBytes(),"iso8859-1") + "\"");
			// 读取文件
			InputStream inputStream = new FileInputStream(file);
			BufferedInputStream bis = new BufferedInputStream(inputStream);
			byte[] bytes = new byte[1024];
			ServletOutputStream outStream = response.getOutputStream();
			BufferedOutputStream bos = new BufferedOutputStream(outStream);
			int readLength = 0;
			while ((readLength = bis.read(bytes)) != -1) {
				bos.write(bytes, 0, readLength);
			}
			// 释放资源
			inputStream.close();
			bis.close();
			bos.flush();
			outStream.close();
			bos.close();
		} else {
			response.setContentType("text/html;charset=utf-8");
			response.getWriter().write("文件不存在!");
			return;
		}
	}

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

}

 

      

      前端代码:

 <script type="text/javascript">

<!--

   function down(){

location.href="down.servlet?filename="+encodeURI(encodeURI('JavaSwing中文.chm'));

}

//-->

</script>

 

//java后台解码

String fileName =java.net.URLDecoder.decode(request.getParameter("filename"),"UTF-8");

 

//设置浏览器输出编码

response.setHeader("Content-Disposition", "attachment; filename=\""

+ new String(fileName.getBytes(),"iso8859-1") + "\"");