JAVA异常 getOutputStream() has already been called for this response

java.lang.IllegalStateException: getOutputStream() has already been called for this response

在JSP中输出文件时如调用 response.getOutputStream();

系统会报

java.lang.IllegalStateException: getOutputStream() has already been called for this response

异常

因为response.getOutputStream();和JSP页面中的JspWrite有冲突

因为需要在JSP的开始时加入

out.clear();

out = pageContext.pushBody();

这二个语句要加在response.getOutputStream();调用之前

如果加上这两个语句后还未解决这个错误可以在调用

response.getOutputStream();

之前加入

response.reset();

语句