JSP下载txt 和 Excel两种文件 

１　下载txt文件　

这个花了我不少时间　原因是用ie下载txt文件时是在页面中直接打开了文件．虽然查了一些资料，也看了别人的解决方案，可还是解决不了问题，最后发现是一个字母惹的祸：少写一个字母　嘿嘿　够马虎！！！

代码如下：

OutputStream o=response.getOutputStream();
    byte b[]=new byte[500];
    File fileLoad=new File("e:/test.txt");
     response.setContentType("application/octet-stream");

   response.setHeader("content-disposition","attachment; filename=text.txt");
    long fileLength=fileLoad.length();
    String length1=String.valueOf(fileLength);
    response.setHeader("Content_Length",length1);
    FileInputStream in=new FileInputStream(fileLoad);
    int n;
    while((n=in.read(b))!=-1){
     o.write(b,0,n);
    }
   
    in.close();
    out.clear();
    out = pageContext.pushBody();

2 下载excel文件　

跟下载txt文件时的唯一区别是ContentType值的设置不同：

OutputStream o=response.getOutputStream();
    byte b[]=new byte[500];
    File fileLoad=new File("e:/text.xls");
    response.reset();
   

     response.setContentType("application/vnd.ms-excel");

    response.setHeader("content-disposition","attachment; filename=text.xls");
    long fileLength=fileLoad.length();
    String length1=String.valueOf(fileLength);
    response.setHeader("Content_Length",length1);
    FileInputStream in=new FileInputStream(fileLoad);
    int n;
    while((n=in.read(b))!=-1){
     o.write(b,0,n);
    }
   
    in.close();
    out.clear();
    out = pageContext.pushBody();

 

 

这两个本来是放在一起的，因为我的页面中需要判断是下载的txt文件还是xls文件　　在这里给分开了　需要注意的是，最后两句一定要加上，否则会出现getOutputStream()错误的！！！！

 

 

 

 

 

 

 

 

实例：

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
 <%
 String path = request.getContextPath();
 String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
 %>
 <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
 <html>
 <head>
     <base href="<%=basePath%>">
     <title>My JSP 'index.jsp' starting page</title>
     <script type="text/javascript">
        function download(filename){
          var url = encodeURI("down2.jsp?filename="+filename);
          window.location.href= url;
        }
     </script>
 </head>

 <body>
普通测试：
<a href="javascript:void(0)" onclick="download('a.txt');">Down a.txt</a>   
中文文件名测试：
<a href="javascript:void(0)" onclick="download('中文.txt');">Down 中文.txt</a>   
普通转向：
<a href="a.txt">down.txt</a>   
 </body>
 </html>

 

down2.jsp:
 <%@ page language="java" import="java.util.*,java.io.* " pageEncoding="UTF-8"%>
 <%
 request.setCharacterEncoding("utf-8");
 String filename = request.getParameter("filename");
 filename = new String(filename.getBytes("ISO-8859-1"),"UTF-8"); 
 System.out.println(filename);
 OutputStream o=response.getOutputStream();
 byte b[]=new byte[500];
 /** * 得到文件的当前路径 * @param args */ 
 String   serverpath=request.getRealPath("\\"); 
 File fileLoad=new File(serverpath+filename);
 response.setContentType("application/octet-stream");
 response.setHeader("content-disposition","attachment; filename="+filename);
 long fileLength=fileLoad.length();
 String length1=String.valueOf(fileLength);
 response.setHeader("Content_Length",length1);
 FileInputStream in=new FileInputStream(fileLoad);
 int n;
 while((n=in.read(b))!=-1){
    o.write(b,0,n);
 }
 in.close();
 out.clear();
 out = pageContext.pushBody();
 %>

转载：http://blog.csdn.net/z69183787/article/details/12995451

posted @ 2015-06-10 11:46  烟消云散....  阅读(517)  评论(0)  编辑  收藏  举报