response下载

最新推荐文章于 2022-11-15 10:51:32 发布

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本文介绍了一个使用Java Servlet实现的文件下载功能示例，特别针对含有中文字符的文件名进行了编码处理，确保了文件能正确下载且文件名显示无误。

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package cn.itcast.response;

import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.OutputStream;
import java.net.URLEncoder;

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

public class ResponseDemo2 extends HttpServlet {

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

test2(response);

}
//中文文件下载时，文件名要经过URL编码
private void test2(HttpServletResponse response)
throws FileNotFoundException, IOException {
String realpath = this.getServletContext().getRealPath("/download/日本.jpg");
String filename = realpath.substring(realpath.lastIndexOf("\\")+1);
response.setHeader("content-disposition", "attachment;filename="+URLEncoder.encode(filename,"utf-8"));
FileInputStream in = new FileInputStream(realpath);
int len = 0;
byte buffer[] = new byte[1024];
OutputStream out = response.getOutputStream();
while((len=in.read(buffer))>0)
{

out.write(buffer,0,len);
}
in.close();
}
private void test1(HttpServletResponse response)
throws FileNotFoundException, IOException {
String realpath = this.getServletContext().getRealPath("/download/11.jpg");
String filename = realpath.substring(realpath.lastIndexOf("\\")+1);
response.setHeader("content-disposition", "attachment;filename="+filename);
FileInputStream in = new FileInputStream(realpath);
int len = 0;
byte buffer[] = new byte[1024];
OutputStream out = response.getOutputStream();
while((len=in.read(buffer))>0)
{

out.write(buffer,0,len);
}
in.close();
}

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

}

}