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Tomcat java.io.FileNotFoundException（访问被拒绝），文件仍然写入@MultipartConfig（位置）

tomcat servlets file-upload

Tomcat java.io.FileNotFoundException（访问被拒绝），文件仍然写入@MultipartConfig（位置）,tomcat,servlets,file-upload,location,multipartconfig,Tomcat,Servlets,File Upload,Location,Multipartconfig,我一直在本地测试一个JavaServlet，我不知道这里发生了什么。文件已在目标位置正确上载，但在正确写入文件后，我收到“访问被拒绝”错误： Apr 08, 2016 10:12:39 AM org.apache.catalina.core.StandardWrapperValve invoke SEVERE: Servlet.service() for servlet [FileUploadServlet] in context with path [/FileUpload] threw ex

我一直在本地测试一个JavaServlet，我不知道这里发生了什么。文件已在目标位置正确上载，但在正确写入文件后，我收到“访问被拒绝”错误：

Apr 08, 2016 10:12:39 AM org.apache.catalina.core.StandardWrapperValve invoke
SEVERE: Servlet.service() for servlet [FileUploadServlet] in context with path [/FileUpload] threw exception
java.io.IOException: java.io.FileNotFoundException: C:\temp (Access is denied)
at org.apache.catalina.core.ApplicationPart.write(ApplicationPart.java:121)
at FileUploadServlet.doPost(FileUploadServlet.java:63)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:647)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:728)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:305)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:51)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:243)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:222)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:123)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:502)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:171)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:100)
at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:953)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:408)
at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1041)
at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:603)
at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:312)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
at java.lang.Thread.run(Thread.java:745)
Caused by: java.io.FileNotFoundException: C:\temp (Access is denied)
at java.io.FileOutputStream.open(Native Method)
at java.io.FileOutputStream.<init>(FileOutputStream.java:221)
at java.io.FileOutputStream.<init>(FileOutputStream.java:171)
at org.apache.tomcat.util.http.fileupload.disk.DiskFileItem.write(DiskFileItem.java:402)
at org.apache.catalina.core.ApplicationPart.write(ApplicationPart.java:119)
... 22 more
编辑2：终于让它工作了（看起来文件在发送文件的单个部分内）。守则：

protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {      
    File uploads = new File("C:/temp");
    Part filePart = request.getPart("file");
    String fileName = extractFileName(filePart);
    File f = new File(fileName);
    File file = new File(uploads, f.getName());
    try (InputStream input = filePart.getInputStream()) {
        Files.copy(input, file.toPath());
    } catch (Exception e){
        response.setContentType("text/html");
        PrintWriter out = response. getWriter();
        out.print("<body>Failed to upload file <br>" + e.getMessage());
    }
}

protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {      
    File uploads = new File("C:/temp");
    Part filePart = request.getPart("file");
    String fileName = extractFileName(filePart);
    File f = new File(fileName);
    File file = new File(uploads, f.getName());
    try (InputStream input = filePart.getInputStream()) {
        Files.copy(input, file.toPath());
    } catch (Exception e){
        response.setContentType("text/html");
        PrintWriter out = response. getWriter();
        out.print("<body>Failed to upload file <br>" + e.getMessage());
    }
}

protectedvoiddopost（HttpServletRequest请求，HttpServletResponse响应）抛出ServletException，IOException{
文件上传=新文件（“C:/temp”）；
Part filePart=request.getPart（“文件”）；
字符串文件名=提取文件名（文件部分）；
文件f=新文件（文件名）；
File File=新文件（上传，f.getName（））；
尝试（InputStream输入=filePart.getInputStream（））{
copy（输入，file.toPath（））；
}捕获（例外e）{
response.setContentType（“text/html”）；
PrintWriter out=response.getWriter（）；
out.print（“未能上载文件
”+e.getMessage（））；
}
}
严重：路径为[/FileUpload]的上下文中Servlet[FileUploadServlet]的Servlet.service（）引发异常 java.io.IOException:java.io.FileNotFoundException:C:\temp（访问被拒绝）

这表示执行此java部署的用户（在本例中是运行app server的用户）没有访问该文件夹的权限。解决方法是，将文件放在运行该文件的用户创建的文件夹中，或向该文件夹授予相应的权限。

最终使其正常工作（看起来该文件位于发送文件的单个部分内）。守则：

protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {      
    File uploads = new File("C:/temp");
    Part filePart = request.getPart("file");
    String fileName = extractFileName(filePart);
    File f = new File(fileName);
    File file = new File(uploads, f.getName());
    try (InputStream input = filePart.getInputStream()) {
        Files.copy(input, file.toPath());
    } catch (Exception e){
        response.setContentType("text/html");
        PrintWriter out = response. getWriter();
        out.print("<body>Failed to upload file <br>" + e.getMessage());
    }
}

protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {      
    File uploads = new File("C:/temp");
    Part filePart = request.getPart("file");
    String fileName = extractFileName(filePart);
    File f = new File(fileName);
    File file = new File(uploads, f.getName());
    try (InputStream input = filePart.getInputStream()) {
        Files.copy(input, file.toPath());
    } catch (Exception e){
        response.setContentType("text/html");
        PrintWriter out = response. getWriter();
        out.print("<body>Failed to upload file <br>" + e.getMessage());
    }
}

protectedvoiddopost（HttpServletRequest请求，HttpServletResponse响应）抛出ServletException，IOException{
文件上传=新文件（“C:/temp”）；
Part filePart=request.getPart（“文件”）；
字符串文件名=提取文件名（文件部分）；
文件f=新文件（文件名）；
File File=新文件（上传，f.getName（））；
尝试（InputStream输入=filePart.getInputStream（））{
copy（输入，file.toPath（））；
}捕获（例外e）{
response.setContentType（“text/html”）；
PrintWriter out=response.getWriter（）；
out.print（“未能上载文件
”+e.getMessage（））；
}
}
什么使您认为文件上传正确？我在表单上单击“上传”后在目标文件夹中看到文件，对此我没有太多经验，但如果在本地工作与此无关，则文件将被删除uploaded@Raedwald：因为
@MultipartConfig
。OP只是误解了
part.write（）
（尽管该API方法的名称的确选错了），根据其文档，它必须被解释为“相对于当前@MultpartConfig（位置）将文件移动/重命名为不同的路径/名称”，例如
part.write（“finalname.ext”）
或
part.write（“subfolder/finalname.ext”）
。Aridez，试一试，让我们知道这是否真的解决了问题。如果仍然无效，请转到错误持续，我将转到您链接的线程，看看是否可以更正此问题。它仍然在正确的位置上传文件，但最后似乎崩溃了，这有点奇怪。文件正确地写入了目标位置，这就是我对此感到奇怪的地方。另外，我是运行该程序的人，我有权在该文件夹上创建文件。我认为这不是本案的问题。