你的位置:首页 > Java教程

[Java教程]java中一个简单的下载示例


首先在tomcat服务器下的webapps的download项目下建一个doc文件夹,再建个test.doc.防止控指针异常

DownLoad.java代码

 1 package com.down; 2  3 import java.io.IOException; 4 import java.io.InputStream; 5  6 import javax.servlet.ServletException; 7 import javax.servlet.ServletOutputStream; 8 import javax.servlet.annotation.WebServlet; 9 import javax.servlet.http.HttpServlet;10 import javax.servlet.http.HttpServletRequest;11 import javax.servlet.http.HttpServletResponse;12 13 @WebServlet(14     name="download",15     urlPatterns={"/test"}16     )17 public class DownLoad extends HttpServlet {18   @Override19   protected void doPost(HttpServletRequest req, HttpServletResponse resp)20       throws ServletException, IOException {21     doGet(req, resp);22   }23   @Override24   protected void doGet(HttpServletRequest request, HttpServletResponse response)25       throws ServletException, IOException {26     response.setContentType("application/msword");27     response.addHeader("Content-disposition","attachment;filename=test.doc");28     InputStream in=getServletContext().getResourceAsStream("/doc/test.doc");29     ServletOutputStream os=response.getOutputStream();30     byte[] bytes=new byte[1024];31     int len=-1;32     while((len=in.read(bytes))!=-1){33       os.write(bytes,0,len);34     }35     in.close();36     os.close();37   }38 }

运行结果: