java中一个简单的下载示例 Posted on 2015-04-04 17:10 思思博士 阅读(...) 评论(...) 编辑 收藏首先在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: