Question

getOutputStream() has already been called for this response java getOutputStream()

FileInputStream fi = new FileInputStream(dlFileName);
byte[] b = new byte[fi.available()];
for (int i = 0; i < b.length; i++){
b[i] = (byte)fi.read();
}
response.setContentType("application/octet-stream; charset=Shift_JIS");
response.setHeader("Content-Disposition", "attachment;filename=\"" + dlFileName + "\"");
response.setContentLength(b.length);
try{
ServletOutputStream os = response.getOutputStream();
os.write(b);
os.close();
}catch(Exception e){
} finally {
fi.close();
}

java中用response.getOutputStream()实现文件下载。可是报错
getOutputStream() has already been called for this response
上网查了查，用JSP实现的话，据说在最后加上out.clear()；out=pageContext.pushBody()；就能解决这个问题。可我的下载是写在java中的，应该怎么解决呢？

Answer 1

response.setCharacterEncoding("UTF-8");
response.setContentType("application/zip; charset=GBK");

InputStream inStream = new FileInputStream(new File(filePath));// 文件的存放路径
String fileName = filePath.substring(filePath.lastIndexOf("\\") + 1);
response.reset();

response.addHeader("Content-Disposition", "attachment; filename=\""
+ fileName + "\"");

byte[] b = new byte[1024];

int len;

while ((len = inStream.read(b)) != -1)
response.getOutputStream().write(b, 0, len);//直接弹出下载框，

Answer 2

那就创建一个out吧PrintWriter out = response.getWriter().

追问

这种情况getOutputStream();不能用么？下载的是CSV文件，里面还有汉字，PrintWriter没问题吧...

追答

response.setContentType用这个设一下编码，gbk，或者utf-8，根据自己情况而定，不设的话很可能会有乱码

Answer 3

试一试 楼上xinfei0804 说的吧。