Smal1_Sun
2016-03-31 03:32
采纳率: 21.4%
浏览 2.5k

Java excel 为什么导入文件第一次导入成功,第二次就失败呢?

附上代码段:
图片说明
file:是获取到的文件内容
jdkFile:是new出了一个临时文件
file.transferTo(jdkFile); : 把内容赋给临时文件
第二次到(file.transferTo(jdkFile); )这句话的时候直接异常,为什么?

  • 写回答
  • 好问题 提建议
  • 关注问题
  • 收藏
  • 邀请回答

5条回答 默认 最新

  • 风聆水净 2016-03-31 05:13

    可能是转换后就自动把流关闭了。所以第二次不好用了。

    评论
    解决 无用
    打赏 举报
  • Smal1_Sun 2016-03-31 08:20

    异常:

     java.io.IOException: Destination file [E:\eclipse\temp] already exists and could not be deleted
        at org.springframework.web.multipart.commons.CommonsMultipartFile.transferTo(CommonsMultipartFile.java:128)
        at com.lovefly.controller.student.StudentController.loadin(StudentController.java:74)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:497)
        at org.springframework.web.method.support.InvocableHandlerMethod.invoke(InvocableHandlerMethod.java:219)
        at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:132)
        at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:104)
        at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandleMethod(RequestMappingHandlerAdapter.java:745)
        at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:686)
        at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:80)
        at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:925)
        at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:856)
        at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:936)
        at org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:838)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:646)
        at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:812)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:727)
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:303)
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
        at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241)
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
        at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:88)
        at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241)
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
        at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:220)
        at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:122)
        at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:503)
        at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:170)
        at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:103)
        at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:950)
        at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:116)
        at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:421)
        at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1070)
        at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:611)
        at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:316)
        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
        at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
        at java.lang.Thread.run(Thread.java:745)
    
    
    评论
    解决 无用
    打赏 举报
  • 盛世兔 2016-03-31 08:33

    Destination file [E:\eclipse\temp] already exists and could not be deleted
    目标文件已存在,不能被删除。
    你代码里是不是有覆盖文件的操作

    评论
    解决 无用
    打赏 举报
  • 风聆水净 2016-03-31 08:48

    我试着重现你说的问题。但是没重现了。所以具体原因我也无法确定。
    SimpleDateFormat df = new SimpleDateFormat("yyyyMMddHHmmss");
    String newFileName = df.format(new Date()) + "_" + new Random().nextInt(1000) + fileExt;
    BufferedOutputStream bos = new BufferedOutputStream(new FileOutputStream(savePath+newFileName));
    InputStream in = myfile.getInputStream();
    BufferedInputStream bis = new BufferedInputStream(in);
    int n = 0;
    byte[] b = new byte[1024];
    while ((n = bis.read(b)) != -1) {
    bos.write(b, 0, n);
    }
    bos.flush();
    bos.close();
    bis.close();

    
    

    实现不行试试用流操作。

    评论
    解决 无用
    打赏 举报
  • 风聆水净 2016-03-31 08:50

    也可以把方法全截出来,在代码上帮你找原因。
    主要错误出现在
    at com.lovefly.controller.student.StudentController.loadin(StudentController.java:74)

    评论
    解决 无用
    打赏 举报

相关推荐 更多相似问题