java.lang.NullPointerException 在 com.sun.jersey.multipart.impl.MultiPartReaderClientSide.unquoteMediaTypeParameters

Question

我休息一下 class 将图像上传到文件夹。当我尝试使用邮递员对其进行测试时，我的休息 class 不会触发。

这是我休息的地方class -

package uploadRest;

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.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) {
try {
    System.out.println("Hi ");
    String uploadedFileLocation = "d://uploaded/" + fileDetail.getFileName();

    // save it
    writeToFile(uploadedInputStream, uploadedFileLocation);

    String output = "File uploaded to : " + uploadedFileLocation;

    return Response.status(200).entity(output).build();
}
catch (Exception e){
    e.printStackTrace();
}

        return null;
    }

    // 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();
        }

    }

}

我尝试通过邮递员对其进行测试，但它不打印 "Hi"，它位于 System.out.println()

这是控制台中打印的内容：-

cache-control: no-cache
Postman-Token: 35942cde-5bcb-487d-896e-b772e9430e55
Content-Type: multipart/form-data
User-Agent: PostmanRuntime/6.1.6
Accept: */*
accept-encoding: gzip, deflate
Connection: keep-alive
Transfer-Encoding: chunked


]] Root cause of ServletException.
java.lang.NullPointerException
    at com.sun.jersey.multipart.impl.MultiPartReaderClientSide.unquoteMediaTypeParameters(MultiPartReaderClientSide.java:245)
    at com.sun.jersey.multipart.impl.MultiPartReaderClientSide.readMultiPart(MultiPartReaderClientSide.java:172)
    at com.sun.jersey.multipart.impl.MultiPartReaderServerSide.readMultiPart(MultiPartReaderServerSide.java:80)
    at com.sun.jersey.multipart.impl.MultiPartReaderClientSide.readFrom(MultiPartReaderClientSide.java:158)
    at com.sun.jersey.multipart.impl.MultiPartReaderClientSide.readFrom(MultiPartReaderClientSide.java:85)
    Truncated. see log file for complete stacktrace
>

这就是我使用邮递员发送请求的方式 -

Answer 1

问题已通过将数据作为表单数据而不是二进制数据发送来解决。我将邮递员体内发送数据的方法从二进制更改为表单数据，问题就解决了。感谢@Vikas Sachdeva 因为分享很有帮助 link :) Tool for sending multipart/form-data request

java.lang.NullPointerException 在 com.sun.jersey.multipart.impl.MultiPartReaderClientSide.unquoteMediaTypeParameters

java.lang.NullPointerException at com.sun.jersey.multipart.impl.MultiPartReaderClientSide.unquoteMediaTypeParameters

multipartform-data

jax-rs

jersey

jersey-2.0