JAVA，Jersy将文件发布到服务器，并从服务器获取文件。使用multiPart

Question

代码：

import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.InputStream;

import javax.ws.rs.client.Entity;
import javax.ws.rs.core.MediaType;

import org.glassfish.jersey.client.ClientResponse;
import org.glassfish.jersey.media.multipart.MultiPart;
import org.glassfish.jersey.media.multipart.file.FileDataBodyPart;

import com.itz.passport.authentication.Int3DPassport;
import com.sun.jersey.api.client.*;
import com.sun.jersey.api.client.config.ClientConfig;
import com.sun.jersey.api.client.config.DefaultClientConfig;
import com.sun.jersey.multipart.impl.MultiPartWriter;

public class UploadFileRestClient {
    private WebResource webResource;
    private Client client;
    private String url = "http://development/server/resources/FileService";

    public UploadFileRestClient() {
        try {
            this.client = Client.create(new DefaultClientConfig());
            this.webResource = client.resource(url).path("/file");

        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    public ClientResponse upload() {
        try {
            Int3DPassport passportAut = new InPassport();
            String host = "http://development/server";
            String userName = "admin";
            String password = "xxxxx";
            String ticket = IntPassport.getTicket(host, userName, password);
            System.out.println("ticket:::::" + ticket);

            WebResource resource = this.webResource;
            MultiPart multiPart = new MultiPart();
            multiPart.setMediaType(MediaType.MULTIPART_FORM_DATA_TYPE);
            FileDataBodyPart fileDataBodyPart = new FileDataBodyPart("photo", new File("D://Documents//Test.txt"));
            multiPart.bodyPart(fileDataBodyPart);

            // here Iam getting error, return statement.
            return resource.path("upload"+ticket).type(MediaType.MULTIPART_FORM_DATA).post(ClientResponse.class, multiPart);

        } catch (Exception e) {
            e.printStackTrace();
        }
        return null;
    }

}

我在return语句的upload（）中获取异常。因此它将捕获并给出空指针异常。我已经用google搜索了此错误com.sun.jersey.api.client.ClientHandlerException，但没有任何解决方案可以解决我的错误。我添加了mimepull.jar和jeresey-multipart.jar。问题仍然没有解决。

com.sun.jersey.api.client.ClientHandlerException: com.sun.jersey.api.client.ClientHandlerException: A message body writer for Java type, class org.glassfish.jersey.media.multipart.MultiPart, and MIME media type, multipart/form-data, was not found
    at com.sun.jersey.client.urlconnection.URLConnectionClientHandler.handle(URLConnectionClientHandler.java:155)
    at com.sun.jersey.api.client.Client.handle(Client.java:652)
    at com.sun.jersey.api.client.WebResource.handle(WebResource.java:682)
    at com.sun.jersey.api.client.WebResource.access$200(WebResource.java:74)
    at com.sun.jersey.api.client.WebResource$Builder.post(WebResource.java:570)
    at Test.main.UploadFileRestClient.upload(UploadFileRestClient.java:66)
    at Test.main.Main.main(Main.java:38)
Caused by: com.sun.jersey.api.client.ClientHandlerException: A message body writer for Java type, class org.glassfish.jersey.media.multipart.MultiPart, and MIME media type, multipart/form-data, was not found
    at com.sun.jersey.api.client.RequestWriter.writeRequestEntity(RequestWriter.java:288)
    at com.sun.jersey.client.urlconnection.URLConnectionClientHandler._invoke(URLConnectionClientHandler.java:217)
    at com.sun.jersey.client.urlconnection.URLConnectionClientHandler.handle(URLConnectionClientHandler.java:153)
    ... 6 more
Exception in thread "main" java.lang.NullPointerException
    at Test.main.Main.main(Main.java:40)

感谢您的帮助和建议。

Answer 1

您的错误报告有问题，尽管如果您是球衣新手，可能会有些含糊。您的客户目前不知道如何映射多部分请求。

Caused by: com.sun.jersey.api.client.ClientHandlerException: A message body writer for Java type, class org.glassfish.jersey.media.multipart.MultiPart, and MIME media type, multipart/form-data, was not found

我不得不在我的ApplicationConfig服务器定义中注册多变的东西，才能使其正常工作，例如；

@Override
public Set<Class<?>> getClasses() 
{
    Set<Class<?>> resources = new java.util.HashSet<>();
    addRestResourceClasses(resources);
    resources.add(MultiPartFeature.class);
    return resources;
}

阅读this应该可以帮助您解决问题。