关于eclipse的servelet上传文件报错“status 500”问题
楼主在做servletupload的题目时,发现一个错误:
type Exception report
message Servlet execution threw an exception
description The server encountered an internal error that prevented it from fulfilling this request.
exception
javax.servlet.ServletException: Servlet execution threw an exception org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:91)
root cause
java.lang.NoClassDefFoundError: org/apache/commons/io/IOUtils org.apache.commons.fileupload.util.Streams.copy(Streams.java:123) org.apache.commons.fileupload.util.Streams.copy(Streams.java:70) org.apache.commons.fileupload.MultipartStream.readBodyData(MultipartStream.java:593) org.apache.commons.fileupload.MultipartStream.discardBodyData(MultipartStream.java:617) org.apache.commons.fileupload.MultipartStream.skipPreamble(MultipartStream.java:634) org.apache.commons.fileupload.FileUploadBase$FileItemIteratorImpl.findNextItem(FileUploadBase.java:1023) org.apache.commons.fileupload.FileUploadBase$FileItemIteratorImpl.<init>(FileUploadBase.java:1003) org.apache.commons.fileupload.FileUploadBase.getItemIterator(FileUploadBase.java:310) org.apache.commons.fileupload.FileUploadBase.parseRequest(FileUploadBase.java:334) org.apache.commons.fileupload.servlet.ServletFileUpload.parseRequest(ServletFileUpload.java:115) com.UploadServlet.doPost(UploadServlet.java:72) javax.servlet.http.HttpServlet.service(HttpServlet.java:647) javax.servlet.http.HttpServlet.service(HttpServlet.java:728) org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:91)
root cause
java.lang.ClassNotFoundException: org.apache.commons.io.IOUtils java.net.URLClassLoader.findClass(Unknown Source) java.lang.ClassLoader.loadClass(Unknown Source) java.lang.ClassLoader.loadClass(Unknown Source) org.apache.commons.fileupload.util.Streams.copy(Streams.java:123) org.apache.commons.fileupload.util.Streams.copy(Streams.java:70) org.apache.commons.fileupload.MultipartStream.readBodyData(MultipartStream.java:593) org.apache.commons.fileupload.MultipartStream.discardBodyData(MultipartStream.java:617) org.apache.commons.fileupload.MultipartStream.skipPreamble(MultipartStream.java:634) org.apache.commons.fileupload.FileUploadBase$FileItemIteratorImpl.findNextItem(FileUploadBase.java:1023) org.apache.commons.fileupload.FileUploadBase$FileItemIteratorImpl.<init>(FileUploadBase.java:1003) org.apache.commons.fileupload.FileUploadBase.getItemIterator(FileUploadBase.java:310) org.apache.commons.fileupload.FileUploadBase.parseRequest(FileUploadBase.java:334) org.apache.commons.fileupload.servlet.ServletFileUpload.parseRequest(ServletFileUpload.java:115) com.UploadServlet.doPost(UploadServlet.java:72) javax.servlet.http.HttpServlet.service(HttpServlet.java:647) javax.servlet.http.HttpServlet.service(HttpServlet.java:728) org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:91)
note The full stack trace of the root cause is available in the Apache Tomcat/8.0.0-RC1 logs.
错误提示是找不到ioClass,然而楼主在eclipse内导入了commons-upload,commons-io的包,但还是这样报错,后来在网上查了好久才理清头绪,本人用的是Tomcat 8.0,lib下面已经有了Commons-upload的包,单独添加这个外部包,eclipse不会报错,但是运行上传文件后会报 500的错误。
解决方法:1.下载commons-io包
2.将下载好的commons-io包放在Tomcat的lib下面
3.在工程内添加外部包时,选择apache-tomcat\lib目录下的包 ①之前存在的commons-fileupload包②刚刚自行拷入的commons-io的包
运行结果: