学步园

使用apache Commons fileUpload 实现文件上传 

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文件的下载：

import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.OutputStream;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
 
public class LoadFile extends HttpServlet {
    public void doGet(HttpServletRequest request, HttpServletResponse response)
           throws IOException, ServletException {
       OutputStream o = response.getOutputStream();
       byte b[] = new byte[1024];
       // the file to download.
       File fileLoad = new File("d:/temp", "test.rar");
       // the dialogbox of download file.
       response.setHeader("Content-disposition", "attachment;filename="
              + "test.rar");
       // set the MIME type.
       response.setContentType("application/x-tar");
       // get the file length.
       long fileLength = fileLoad.length();
       String length = String.valueOf(fileLength);
       response.setHeader("Content_Length", length);
       // download the file.
       FileInputStream in = new FileInputStream(fileLoad);
       int n = 0;
       while ((n = in.read(b)) != -1) {
           o.write(b, 0, n);
       }
    }
 
    public void doPost(HttpServletRequest request, HttpServletResponse response)  throws IOException, ServletException {
       doGet(request, response);
    }
}