Java服务器抛出java.lang.IllegalStateException：提交响应后无法调用sendError（）

Question

请帮我java服务器抛出：java.lang.IllegalStateException：响应提交后无法调用sendError（）我重新检查了很多次并用Google搜索了很多，但是我找不到问题所在，这是我的代码

    DataOutputStream stream = null;
BufferedInputStream buf = null;
try {
response = ServletActionContext.getResponse();
response.setHeader(Constants.AU_TRST_X_RESULT_CD, "0"); // x-resultCd = 0 is OK
// add RSP_KEY_CODE to header
response.setHeader(Constants.RSP_KEY_CODE, Constants.RSP_SUCCCESS + "");
response.setContentType("application/csv");
//------------ write csv file to body ----------
// get response's outputStream
stream = new DataOutputStream(response.getOutputStream());
// fix file csv
File csvFixFile = new File("E:\\a.xls");   
// buffer to read csv File

File csvResponse = new File(csvFixFile.getPath());
// file Input to read csv File
FileInputStream inputStream = new FileInputStream(csvResponse);
buf = new BufferedInputStream(inputStream);
int readBytes = 0;
while ((readBytes = buf.read()) != -1) {
stream.write(readBytes);
}

} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} finally {
if (null != buf)
try {buf.close();} catch (Exception e2) {e2.printStackTrace();}
if (null != stream)
try {stream.close();} catch (Exception e2) {e2.printStackTrace();}  
}

。看起来不错，但无法正常工作，也许问题在while循环中，请为我指出.....

Answer 1

您可以使用apache commons-io中的IOUtils将输入流复制到输出流中（它也使用缓冲区，因此您不需要这样做）：

ServletOutputStream outStream = response.getOutputStream();
IOUtils.copy(inputStream, outStream);

IOUtils javadoc