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来源：xjh; 编辑：xjh; 2006-12-14
在image.jsp中生成验证码并输出图象到页面，调用ImageIO.write(image, "JPEG", response.getOutputStream())方法后产生下面的异常：
2006-12-12 11:28:19 [StandardWrapper[:jsp]]-[ERROR] 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:596)
需要解决！！！我已把image.jsp原代码添加到附件中！