jsp下载文件异常getOutputStream() has already been called for this response

0 0

jsp下载文件异常getOutputStream() has already been called for this response5

下面是我的jsp代码

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8" %>
<%@ page contentType="text/html;charset=utf-8" %>
<%@ page import="java.io.*" %>
<%@ page import="java.net.*" %>

<html>
  <head>
    <title>download file</title>
  </head>

  <body>
    <%
      response.setContentType("text/html");
      javax.servlet.ServletOutputStream ou = response.getOutputStream();
      String filepath = request.getParameter("file_path");
      String filename = new String(request.getParameter("filename").getBytes("ISO-8859-1"),"utf-8").toString();
      java.io.File file = new java.io.File(filepath + filename);
      if(!file.exists()) {
          out.print(file.getAbsolutePath()+" File Not Exist !");
          return;
      }
      java.io.FileInputStream fileInputStream = new FileInputStream(file);
      if (filename != null && filename.length() > 0) {
          response.setContentType("application/x-msdownload");
          response.setHeader("Content-Disposition", "attachment; filename=" + new String(filename.getBytes("utf-8"),"ISO-8859-1") + "");
          if (fileInputStream != null) {
              int filelen = fileInputStream.available();
              byte[] a = new byte[filelen];
              fileInputStream.read(a);
              ou.write(a);
          }
          fileInputStream.close();
          ou.close();
      }
      out.clear();
      out = pageContext.pushBody();   
    %>
  </body>
</html>

下面是异常:
严重的: Servlet.service() for servlet jsp threw exception
java.lang.IllegalStateException: getOutputStream() has already been called for this response
at org.apache.catalina.connector.Response.getWriter(Response.java:611)

在网上查了，说加上后面2局就可以，但是我加了也报异常！
请各位帮看下，在线苦等，谢谢！
快没分了，不知道以后没分还能不能提问...

2012年8月27日 21:02

cherishmmo2004
2
0 0 9

2个答案按时间排序按投票排序

0 0

送你个下载demo吧。我测试通过了，没有异常

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8" %>  
<%@ page contentType="text/html;charset=utf-8" %>  
<%@ page import="java.io.*" %>  
  
<html>  
  <head>  
    <title>download file</title>  
  </head>  
  
  <body>  
<%
	response.setContentType("text/html");  
	OutputStream o = response.getOutputStream();
	byte b[] = new byte[5000];
	File fileLoad = new File("d:/book.doc");
	response.setContentType("application/x-msdownload");

	response.setHeader("content-disposition",
			"attachment; filename=book.doc");
	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();
%>
  </body>  
</html>

//需要修改的地方：
File("d:/book.doc");
filename=book.doc");

2012年8月29日 21:51

demojava
2207
1 3 134

添加评论

0 0

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8" %><%@ page contentType="text/html;charset=utf-8" %><%@ page import="java.io.*" %><%@ page import="java.net.*" %><%
      response.setContentType("text/html");
      javax.servlet.ServletOutputStream ou = response.getOutputStream();
      String filepath = request.getParameter("file_path");
      String filename = new String(request.getParameter("filename").getBytes("ISO-8859-1"),"utf-8").toString();
      java.io.File file = new java.io.File(filepath + filename);
      if(!file.exists()) {
          out.print(file.getAbsolutePath()+" File Not Exist !");
          return;
      }
      java.io.FileInputStream fileInputStream = new FileInputStream(file);
      if (filename != null && filename.length() > 0) {
          response.setContentType("application/x-msdownload");
          response.setHeader("Content-Disposition", "attachment; filename=" + new String(filename.getBytes("utf-8"),"ISO-8859-1") + "");
          if (fileInputStream != null) {
              int filelen = fileInputStream.available();
              byte[] a = new byte[filelen];
              fileInputStream.read(a);
              ou.write(a);
          }
          fileInputStream.close();
          ou.close();
      }
      out.clear();
      out = pageContext.pushBody();   
    %>

删除所有空行和 html 内容，，因为这些元素其实会调用 getWriter().out()输出的

2012年8月27日 22:15