上傳文件中使用web服務休息

Question

我使用這個代碼上傳文件

@Path(value= "/up") 
public class upload { 
public static String SERVER_UPLOAD_LOCATION_FOLDER =  "C://Users/Marya/Desktop/"; 
@POST 
@Path(value="upload") 
    @Consumes(MediaType.MULTIPART_FORM_DATA) 
    public Response uploadFile(@FormDataParam("file") InputStream fileInputStream,@FormDataParam("name") FormDataContentDisposition fileDetail) { 
    String filePath = SERVER_UPLOAD_LOCATION_FOLDER + fileDetail.getFileName(); 
    System.out.println("*****serverpath********"); 
    saveFile(fileInputStream, filePath); 
    String output = "File saved to server location : " + filePath; 
    System.out.println("done"); 
    return Response.status(200).entity(output).build(); 
} 
private void saveFile(InputStream uploadedInputStream,String serverLocation) { 
    try { 
    OutputStream outpuStream = new FileOutputStream(new File(serverLocation)); 
     int read = 0; 
     byte[] bytes = new byte[1024]; 
     outpuStream = new FileOutputStream(new File(serverLocation)); 
     while ((read = uploadedInputStream.read(bytes)) != -1) { 
      outpuStream.write(bytes, 0, read); 
      System.out.println("*****read********"); 
     } 
     outpuStream.flush(); 
     outpuStream.close(); 
    } catch (IOException e) { 
     e.printStackTrace(); 
    } 
} 

此代碼工作，但上傳文件的名稱是在路徑「C提到「newfile中」：//Users/Marya/Desktop/newfile「。那麼我怎樣才能保存文件的名稱？

加入罐子後，我得到這個錯誤

新的錯誤

Grave: The RuntimeException could not be mapped to a response, re-throwing to the HTTP container 
java.lang.NullPointerException 
at com.example.upload.uploadFile(upload.java:28) 
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) 
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) 
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) 
at java.lang.reflect.Method.invoke(Unknown Source) 
at com.sun.jersey.spi.container.JavaMethodInvokerFactory$1.invoke(JavaMethodInvokerFactory.java:60) 
at com.sun.jersey.server.impl.model.method.dispatch.AbstractResourceMethodDispatchProvider$ResponseOutInvoker._dispatch(AbstractResourceMethodDispatchProvider.java:205) 
at com.sun.jersey.server.impl.model.method.dispatch.ResourceJavaMethodDispatcher.dispatch(ResourceJavaMethodDispatcher.java:75) 
at com.sun.jersey.server.impl.uri.rules.HttpMethodRule.accept(HttpMethodRule.java:302) 
at com.sun.jersey.server.impl.uri.rules.RightHandPathRule.accept(RightHandPathRule.java:147) 
at com.sun.jersey.server.impl.uri.rules.ResourceClassRule.accept(ResourceClassRule.java:108) 
at com.sun.jersey.server.impl.uri.rules.RightHandPathRule.accept(RightHandPathRule.java:147) 
at com.sun.jersey.server.impl.uri.rules.RootResourceClassesRule.accept(RootResourceClassesRule.java:84) 
at com.sun.jersey.server.impl.application.WebApplicationImpl._handleRequest(WebApplicationImpl.java:1542) 
at com.sun.jersey.server.impl.application.WebApplicationImpl._handleRequest(WebApplicationImpl.java:1473) 
at com.sun.jersey.server.impl.application.WebApplicationImpl.handleRequest(WebApplicationImpl.java:1419) 
at com.sun.jersey.server.impl.application.WebApplicationImpl.handleRequest(WebApplicationImpl.java:1409) 
at com.sun.jersey.spi.container.servlet.WebComponent.service(WebComponent.java:409) 
at com.sun.jersey.spi.container.servlet.ServletContainer.service(ServletContainer.java:540) 
at com.sun.jersey.spi.container.servlet.ServletContainer.service(ServletContainer.java:715) 
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.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:501) 
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:170) 
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:98) 
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:408) 
at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1040) 
at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:607) 
at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:313) 
at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source) 
at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source) 
at java.lang.Thread.run(Unknown Source) 

Answer 1

，你應該在你的帖子傳遞文件名：

@Path(value= "/up") 
    public class upload { 
    public static String SERVER_UPLOAD_LOCATION_FOLDER = "C://Users//Marya//Desktop//newfile"; 

     @POST 
     @Path(value="upload") 
     @Consumes(MediaType.MULTIPART_FORM_DATA) 
     public Response uploadFile(@FormDataParam("file") InputStream fileIS, @FormDataParam("name") String name) { 

     //recommand to test call arguments here (null, empty) in order to throw errors 
     if (name==null || fileIS==null) return Response.status(400).build(); 


     String location =SERVER_UPLOAD_LOCATION_FOLDER+java.io.File.separator+ name; 
     System.out.println("before write ["+location+"]"); 
     saveFile(fileIS, location); 
     String output = "File saved to server location : " + location; 
     System.out.println("file written ["+location+"]"); 
     return Response.ok().entity(output).build(); 
    } 

    /** 
    **/ 
    private void saveFile(InputStream uploadedInputStream,String serverLocation) { 
     try { 
     OutputStream outpuStream = new FileOutputStream(new File(serverLocation)); 
      int read = 0; 
      byte[] bytes = new byte[1024]; 
      outpuStream = new FileOutputStream(new File(serverLocation)); 
      while ((read = uploadedInputStream.read(bytes)) != -1) { 
       outpuStream.write(bytes, 0, read); 
       System.out.println("*****read********"); 
      } 
      outpuStream.flush(); 
      outpuStream.close(); 
     } catch (IOException e) { 
      e.printStackTrace(); 
     } 
    } 

而寫美麗代碼，我應該使用org.apache.commons.io.IOUtils.write()這比你的o wn循環閱讀/寫作。這會重構saveFile（），如下所示：

/** 
    * save File v2 with apache.commons.io 
    **/ 
    private void saveFile(InputStream uploadedInputStream,String serverLocation) { 
     try { 
     OutputStream outpuStream = new FileOutputStream(new File(serverLocation)); 
      org.apache.commons.io.IOUtils.write(uploadedInputStream, outpuStream); 
      outpuStream.close(); 
     } catch (IOException e) { 
      e.printStackTrace(); 
     } 
    } 

享受！ :)更新6/06 12:23 BRT

請試試這個代碼：

@Path(value= "/up") 
    public class upload { 
    public static String SERVER_UPLOAD_LOCATION_FOLDER = "C://Users//Marya//Desktop//newfile"; 

    @POST 
    @Path(value="upload") 
    @Consumes(MediaType.MULTIPART_FORM_DATA) 
    public Response uploadFile(@FormDataParam("file") InputStream fileIS, @FormDataParam("file") FormDataContentDisposition fileDetail) { 

    //recommand to test call arguments here (null, empty) in order to throw errors 
    if (fileDetail ==null || fileIS==null) return Response.status(400).build(); 


    String location =SERVER_UPLOAD_LOCATION_FOLDER+java.io.File.separator+ fileDetail.getFileName(); 
    System.out.println("before write ["+location+"]"); 
    saveFile(fileIS, location); 
    String output = "File saved to server location : " + location; 
    System.out.println("file written ["+location+"]"); 
    return Response.ok().entity(output).build(); 
} 

更新6/06 14:54 BRT 請試試這個代碼：

@Path(value= "/up") 
    public class upload { 
    public static String SERVER_UPLOAD_LOCATION_FOLDER = "C://Users//Marya//Desktop//newfile"; 

    @POST 
    @Path(value="upload") 
    @Consumes(MediaType.MULTIPART_FORM_DATA) 
    public Response uploadFile(@FormDataParam("file") InputStream fileIS, @FormDataParam("file") FormDataContentDisposition fileDetail) { 

    //recommand to test call arguments here (null, empty) in order to throw errors 
    if (fileDetail ==null || fileIS==null) return Response.status(400).build(); 


    String location =SERVER_UPLOAD_LOCATION_FOLDER+java.io.File.separator+ fileDetail.getFileName(); 
    System.out.println("before write ["+location+"]"); 
    saveFile(fileIS, location); 
    String output = "File saved to server location : " + location; 
    System.out.println("file written ["+location+"]"); 
    return Response.status(200).entity(output).build(); 
}