报错：java.lang.IllegalStateException: getOutputStream() has already been called for this response
文章目录
- 问题背景
- 分析
- 解决方案
错误信息详情：
严重: Servlet.service() for servlet [jsp] in context with path [/exportExcel] threw exception [java.lang.IllegalStateException: getOutputStream() has already been called for this response] with root cause
java.lang.IllegalStateException: getOutputStream() has already been called for this responseat org.apache.catalina.connector.Response.getWriter(Response.java:678)at org.apache.catalina.connector.ResponseFacade.getWriter(ResponseFacade.java:213)at org.apache.jasper.runtime.JspWriterImpl.initOut(JspWriterImpl.java:125)at org.apache.jasper.runtime.JspWriterImpl.flushBuffer(JspWriterImpl.java:118)at org.apache.jasper.runtime.PageContextImpl.release(PageContextImpl.java:194)at org.apache.jasper.runtime.JspFactoryImpl.internalReleasePageContext(JspFactoryImpl.java:126)at org.apache.jasper.runtime.JspFactoryImpl.releasePageContext(JspFactoryImpl.java:80)at org.apache.jsp.export_jsp._jspService(export_jsp.java:566)at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)at javax.servlet.http.HttpServlet.service(HttpServlet.java:731)...
问题背景
在写一个 download.jsp ，提供下载文件功能（部分关键代码）如下：
....<%...response.addHeader("Content-Disposition","attachment;filename=\"..\"");response.addHeader("Content-Length",43408);...OutputStream out = response.getOutputStream();InputStream in;//todo intialize inputStream...while((n = in.read(b)) != -1) {out.write(b, 0, n);}out.flush;
%>
运行结果：
结果功能 -> 正常，但是有一点不爽！！日志一直有报错，报错如下：
java.lang.IllegalStateException: getOutputStream() has already been called for this response
分析
翻阅了挺多资料，最后总结如下：
- 其实就是因为 JSP 中同时用了 response.getOutputStream() 以及 JSP 内置对象 out.write().
- Serlvet 规范中不能同时使用这两个。只能选其中一个。所以再来分析代码：
response.getOutputStream(): 很明显在代码中已经用到了。out.write()：这个很有可能是 JSP 中存在空行或者回车导致的。至于到底是什么时候有 out.write() 。大家可以到 tomcat 目录下看看 jsp 生成的 .java 文件就一目了然了。
解决方案
参考网上的，在调用 response.getOutStream() 之前清空一下两者的缓存。同时更新 out 的内容。
详情看代码（实践已证明可行）↓
<%// 同时 reset response 和 清空 outresponse.reset();out.clear();out = pageContext.pushBody();// ---------------------增加上面的内容--------------------------------------...response.addHeader("Content-Disposition","attachment;filename=\"..\"");response.addHeader("Content-Length",43408);...OutputStream out = response.getOutputStream();InputStream in;//todo intialize inputStream...while((n = in.read(b)) != -1) {out.write(b, 0, n);}out.flush;
%>喜欢就来点个赞吧~
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