解决Excel导出时getOutputStream() has already been called for this response异常

最新推荐文章于 2021-12-30 14:26:38 发布
原创 最新推荐文章于 2021-12-30 14:26:38 发布 · 4.7k 阅读 · 1 ·
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本文介绍了一个常见的Servlet输出异常问题：getOutputStream()hasalreadybeencalledforthisresponse，并给出了详细的堆栈跟踪信息。此错误通常发生在尝试多次使用不同的输出流时。解决方案是确保只调用一次getOutputStream()或getWriter()，并建议将String改为void返回类型。
严重: 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:662)
at org.apache.catalina.connector.ResponseFacade.getWriter(ResponseFacade.java:213)
at javax.servlet.ServletResponseWrapper.getWriter(ServletResponseWrapper.java:104)
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:186)
at org.apache.jasper.runtime.JspFactoryImpl.internalReleasePageContext(JspFactoryImpl.java:125)
at org.apache.jasper.runtime.JspFactoryImpl.releasePageContext(JspFactoryImpl.java:79)
at org.apache.jsp.showUser_jsp._jspService(showUser_jsp.java:114)
at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)

at javax.servlet.http.HttpServlet.service(HttpServlet.java:731)



将String改成void即可。


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