问如何使用JSP / Servlet将文件上传到服务器？

提问于 2017-12-15 15:48:39

回答 2关注 0查看 729

怎样才能使用JSP / Servlet上传文件到服务器？我试过这个：

<form action="upload" method="post">

    <input type="text" name="description" />

    <input type="file" name="file" />

    <input type="submit" />

</form>

但是，我只获取文件名，而不是文件内容。当我添加 enctype="multipart/form-data"到<form>，然后request.getParameter()返回null。

在研究期间，我偶然发现了Apache Common FileUpload。我试过这个：

FileItemFactory factory = new DiskFileItemFactory();

ServletFileUpload upload = new ServletFileUpload(factory);

List items = upload.parseRequest(request); // This line is where it died.

不幸的是，servlet抛出了一个没有明确信息和原因的异常。这里是堆栈跟踪：

SEVERE: Servlet.service() for servlet UploadServlet threw exception

javax.servlet.ServletException: Servlet execution threw an exception

    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:313)

    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)

    at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233)

    at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191)

    at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127)

    at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)

    at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)

    at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:298)

    at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:852)

    at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:588)

    at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:489)

    at java.lang.Thread.run(Thread.java:637)

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