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Uploading files using Rest API in Java

I am new to REST API. I want to upload a user-selected file to a user-provided path (remote or local path) using the REST API. In my html file there is 1 text box and 1 selection file. The user enters FilePath (local or remote location of the computer folder) in the text box. Please suggest how to solve this problem.

Here is my code:

FileUpload.html:

<body> <form action="rest/file/upload" method="post" enctype="multipart/form-data"> <p> Select a file : <input type="file" name="file" size="45" /> </p> <p>Target Upload Path : <input type="text" name="path" /></p> <input type="submit" value="Upload It" /> </form> </body>

UploadFileService.java

 @Path("/file") public class UploadFileService { @POST @Path("/upload") @Consumes(MediaType.MULTIPART_FORM_DATA) public Response uploadFile( @FormDataParam("file") InputStream uploadedInputStream, @FormDataParam("file") FormDataContentDisposition fileDetail, @FormParam("path") String path) { /*String uploadedFileLocation = "d://uploaded/" + fileDetail.getFileName();*/ /*String uploadedFileLocation = //10.217.14.88/Installables/uploaded/" + fileDetail.getFileName();*/ String uploadedFileLocation = path + fileDetail.getFileName(); // save it writeToFile(uploadedInputStream, uploadedFileLocation); String output = "File uploaded to : " + uploadedFileLocation; return Response.status(200).entity(output).build(); } // save uploaded file to new location private void writeToFile(InputStream uploadedInputStream, String uploadedFileLocation) { try { OutputStream out = new FileOutputStream(new File( uploadedFileLocation)); int read = 0; byte[] bytes = new byte[1024]; out = new FileOutputStream(new File(uploadedFileLocation)); while ((read = uploadedInputStream.read(bytes)) != -1) { out.write(bytes, 0, read); } out.flush(); out.close(); } catch (IOException e) { e.printStackTrace(); } } }

web.xml

 <display-name>JAXRSFileUploadJerseyExample</display-name> <servlet> <servlet-name>jersey-serlvet</servlet-name> <servlet-class>com.sun.jersey.spi.container.servlet.ServletContainer</servlet-class> <init-param> <param-name>com.sun.jersey.config.property.packages</param-name> <param-value>com.mkyong.rest</param-value> </init-param> <load-on-startup>1</load-on-startup> </servlet> <servlet-mapping> <servlet-name>jersey-serlvet</servlet-name> <url-pattern>/rest/*</url-pattern> </servlet-mapping>

An exception:

 HTTP Status 500 - com.sun.jersey.api.container.ContainerException: Exception obtaining parameters type Exception report message com.sun.jersey.api.container.ContainerException: Exception obtaining parameters description The server encountered an internal error that prevented it from fulfilling this request. exception javax.servlet.ServletException: com.sun.jersey.api.container.ContainerException: Exception obtaining parameters com.sun.jersey.spi.container.servlet.WebComponent.service(WebComponent.java:425) com.sun.jersey.spi.container.servlet.ServletContainer.service(ServletContainer.java:537) com.sun.jersey.spi.container.servlet.ServletContainer.service(ServletContainer.java:699) javax.servlet.http.HttpServlet.service(HttpServlet.java:728) root cause com.sun.jersey.api.container.ContainerException: Exception obtaining parameters com.sun.jersey.server.impl.inject.InjectableValuesProvider.getInjectableValues(InjectableValuesProvider.java:54) com.sun.jersey.multipart.impl.FormDataMultiPartDispatchProvider$FormDataInjectableValuesProvider.getInjectableValues(FormDataMultiPartDispatchProvider.java:125) com.sun.jersey.server.impl.model.method.dispatch.AbstractResourceMethodDispatchProvider$EntityParamInInvoker.getParams(AbstractResourceMethodDispatchProvider.java:153) com.sun.jersey.server.impl.model.method.dispatch.AbstractResourceMethodDispatchProvider$ResponseOutInvoker._dispatch(AbstractResourceMethodDispatchProvider.java:203) com.sun.jersey.server.impl.model.method.dispatch.ResourceJavaMethodDispatcher.dispatch(ResourceJavaMethodDispatcher.java:75) com.sun.jersey.server.impl.uri.rules.HttpMethodRule.accept(HttpMethodRule.java:288) com.sun.jersey.server.impl.uri.rules.RightHandPathRule.accept(RightHandPathRule.java:147) com.sun.jersey.server.impl.uri.rules.ResourceClassRule.accept(ResourceClassRule.java:108) com.sun.jersey.server.impl.uri.rules.RightHandPathRule.accept(RightHandPathRule.java:147) com.sun.jersey.server.impl.uri.rules.RootResourceClassesRule.accept(RootResourceClassesRule.java:84) com.sun.jersey.server.impl.application.WebApplicationImpl._handleRequest(WebApplicationImpl.java:1469) com.sun.jersey.server.impl.application.WebApplicationImpl._handleRequest(WebApplicationImpl.java:1400) com.sun.jersey.server.impl.application.WebApplicationImpl.handleRequest(WebApplicationImpl.java:1349) com.sun.jersey.server.impl.application.WebApplicationImpl.handleRequest(WebApplicationImpl.java:1339) com.sun.jersey.spi.container.servlet.WebComponent.service(WebComponent.java:416) com.sun.jersey.spi.container.servlet.ServletContainer.service(ServletContainer.java:537) com.sun.jersey.spi.container.servlet.ServletContainer.service(ServletContainer.java:699) javax.servlet.http.HttpServlet.service(HttpServlet.java:728) root cause java.lang.IllegalStateException: The @FormParam is utilized when the content type of the request entity is not application/x-www-form-urlencoded com.sun.jersey.server.impl.model.parameter.FormParamInjectableProvider$FormParamInjectable.getValue(FormParamInjectableProvider.java:81) com.sun.jersey.server.impl.inject.InjectableValuesProvider.getInjectableValues(InjectableValuesProvider.java:46) com.sun.jersey.multipart.impl.FormDataMultiPartDispatchProvider$FormDataInjectableValuesProvider.getInjectableValues(FormDataMultiPartDispatchProvider.java:125) com.sun.jersey.server.impl.model.method.dispatch.AbstractResourceMethodDispatchProvider$EntityParamInInvoker.getParams(AbstractResourceMethodDispatchProvider.java:153) com.sun.jersey.server.impl.model.method.dispatch.AbstractResourceMethodDispatchProvider$ResponseOutInvoker._dispatch(AbstractResourceMethodDispatchProvider.java:203) com.sun.jersey.server.impl.model.method.dispatch.ResourceJavaMethodDispatcher.dispatch(ResourceJavaMethodDispatcher.java:75) com.sun.jersey.server.impl.uri.rules.HttpMethodRule.accept(HttpMethodRule.java:288) com.sun.jersey.server.impl.uri.rules.RightHandPathRule.accept(RightHandPathRule.java:147) com.sun.jersey.server.impl.uri.rules.ResourceClassRule.accept(ResourceClassRule.java:108) com.sun.jersey.server.impl.uri.rules.RightHandPathRule.accept(RightHandPathRule.java:147) com.sun.jersey.server.impl.uri.rules.RootResourceClassesRule.accept(RootResourceClassesRule.java:84) com.sun.jersey.server.impl.application.WebApplicationImpl._handleRequest(WebApplicationImpl.java:1469) com.sun.jersey.server.impl.application.WebApplicationImpl._handleRequest(WebApplicationImpl.java:1400) com.sun.jersey.server.impl.application.WebApplicationImpl.handleRequest(WebApplicationImpl.java:1349) com.sun.jersey.server.impl.application.WebApplicationImpl.handleRequest(WebApplicationImpl.java:1339) com.sun.jersey.spi.container.servlet.WebComponent.service(WebComponent.java:416) com.sun.jersey.spi.container.servlet.ServletContainer.service(ServletContainer.java:537) com.sun.jersey.spi.container.servlet.ServletContainer.service(ServletContainer.java:699) javax.servlet.http.HttpServlet.service(HttpServlet.java:728)
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2 answers

I have an updated method signature in the class below and its performance. Instead of @FormParam , @FormDataParam("path") String path is used, and it solved my problem. Below is the updated code:

 import java.io.File; import java.io.FileOutputStream; import java.io.IOException; import java.io.InputStream; import java.io.OutputStream; import javax.ws.rs.Consumes; import javax.ws.rs.FormParam; import javax.ws.rs.POST; import javax.ws.rs.Path; import javax.ws.rs.core.MediaType; import javax.ws.rs.core.Response; import com.sun.jersey.core.header.FormDataContentDisposition; import com.sun.jersey.multipart.FormDataParam; @Path("/file") public class UploadFileService { @POST @Path("/upload") @Consumes(MediaType.MULTIPART_FORM_DATA) public Response uploadFile( @FormDataParam("file") InputStream uploadedInputStream, @FormDataParam("file") FormDataContentDisposition fileDetail, @FormDataParam("path") String path) { // Path format //10.217.14.97/Installables/uploaded/ System.out.println("path::"+path); String uploadedFileLocation = path + fileDetail.getFileName(); // save it writeToFile(uploadedInputStream, uploadedFileLocation); String output = "File uploaded to : " + uploadedFileLocation; return Response.status(200).entity(output).build(); } // save uploaded file to new location private void writeToFile(InputStream uploadedInputStream, String uploadedFileLocation) { try { OutputStream out = new FileOutputStream(new File( uploadedFileLocation)); int read = 0; byte[] bytes = new byte[1024]; out = new FileOutputStream(new File(uploadedFileLocation)); while ((read = uploadedInputStream.read(bytes)) != -1) { out.write(bytes, 0, read); } out.flush(); out.close(); } catch (IOException e) { e.printStackTrace(); } } }
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Another possible solution

@ Uses annotation and sets it to the application octet stream. Use the PUT http method. Then in the client read the bytes from the file and load.

My sample code for the REST service for the zip file here is fooobar.com/questions/57621 / ...

Hope this helps.

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Source: https://habr.com/ru/post/972656/

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