weblogic输出或下载文件未设定contentLength异常
weblogic在下载文件或向浏览器输出文件的时候，如果没有设定contentLength或者设置的contentLength长度和文件本身输出的长度不一致，那么就可能报如下的异常。java.net.ProtocolException: Didn't meet stated Content-Length, wrote: '146592' bytes instead of stated: '462285' bytes.
at weblogic.servlet.internal.ServletOutputStreamImpl.ensureContentLength(ServletOutputStreamImpl.java:470)
at weblogic.servlet.internal.ServletResponseImpl.ensureContentLength(ServletResponseImpl.java:1176)
at weblogic.servlet.internal.ServletResponseImpl.send(ServletResponseImpl.java:1188)
at weblogic.servlet.internal.ServletRequestImpl.execute(ServletRequestImpl.java:2590)
at weblogic.kernel.ExecuteThread.execute(ExecuteThread.java:197)
at weblogic.kernel.ExecuteThread.run(ExecuteThread.java:170)
解决方案：见第一段描述
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