1 package cn.itcast.response; 2  3 import java.io.FileInputStream; 4 import java.io.IOException; 5 import java.io.InputStream; 6 import java.io.OutputStream; 7 import java.io.PrintWriter; 8 import java.io.UnsupportedEncodingException; 9 import java.net.URLEncoder;10 11 import javax.servlet.ServletException;12 import javax.servlet.http.HttpServlet;13 import javax.servlet.http.HttpServletRequest;14 import javax.servlet.http.HttpServletResponse;15 16 public class ResponseDemo extends HttpServlet {17 18     public void doGet(HttpServletRequest request, HttpServletResponse response)19             throws ServletException, IOException {20 21         String path = this.getServletContext().getRealPath("/download/日本妞.jpg");22         String filename = path.substring(path.lastIndexOf("\\") + 1);23         24         //如果下载文件是中文文件，则文件名需要经过URL编码25         response.setHeader("content-disposition", "attachment;filename="26                 + URLEncoder.encode(filename,"UTF-8"));27 28         InputStream in = null;29         OutputStream out = null;30 31         in = new FileInputStream(path);32         int len = 0;33         byte buffer[] = new byte[1024];34 35         out = response.getOutputStream();36         while ((len = in.read(buffer)) > 0) {37             out.write(buffer, 0, len);38         }39 40         in.close();41         out.close();42 43     }44 45     public void doPost(HttpServletRequest request, HttpServletResponse response)46             throws ServletException, IOException {47 48     }49 50 }