response下載

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);


}
//中文文件下載時，文件名要經過URL編碼
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);


}


}