Some guys often ask me to help them to get some files from the server, such as tomcat log. Everytime I must open ftp client to connect the server, download these file. The lazy man need a smart way to do this job. Now they can help themselves.

 import java.io.File;
 import java.io.FileInputStream;
 import java.io.IOException;
 import java.io.InputStream;
 import java.io.OutputStream;
 import java.util.zip.*;
 import javax.servlet.http.HttpServletRequest;
 import javax.servlet.http.HttpServletResponse;
 public class ZGet {
     public void get(HttpServletRequest request, HttpServletResponse response, String filename) {
         try {
             // String fname = request.getParameter("xpath");
             fname = filename;
             File f = new File(fname);
             if (f.canRead()) {
                 response.setContentType("application/x-gzip");
                 response.setHeader("Location", f.getName());  
                 response.setHeader("Content-Disposition", "attachment; filename=" + f.getName() + ".gz");
                 get(new FileInputStream(filename), response.getOutputStream());
                 response.getOutputStream().flush();
                 response.getOutputStream().close();
              }
          } catch (Exception e) {
              // TODO Auto-generated catch block
              //e.printStackTrace();
          }  
      }
      private void get(InputStream in, OutputStream out) throws IOException {
          if (in == null || out == null) {
              return;
          }
          byte[] buffer = new byte[1024];
          int i = -1;
          GZIPOutputStream gzip = new GZIPOutputStream(out);
          while ((i = in.read(buffer)) != -1) {
              gzip.write(buffer, 0, i);
          }
          gzip.close();
      }
  }