Question

我正在尝试使用JAX RS设置文件上传示例。我可以在客户端是JSP页面时设置项目，并且没有问题。但我想将客户端作为一个java类，它将post请求发送给服务。我的服务器端代码如下所示。

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) {

    String uploadedFileLocation = "d://uploaded/"
            + fileDetail.getFileName();


    writeToFile(uploadedInputStream, uploadedFileLocation);

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

    return Response.status(200).entity(output).build();

}


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();
    }

}

}

作为JSP页面的客户端如下所示。

<html>
<body>
<h1>File Upload with Jersey</h1>

<form action="http://localhost:9090/RESTfulExample/rest/file/upload" method="post" enctype="multipart/form-data">

   <p>
    Select a file : <input type="file" name="file" size="45" />
   </p>

   <input type="submit" value="Upload It" />
</form>

</body>
</html>

有人可以帮助我作为客户提供课程文件吗？

Answer 1

您可以使用Apache的httpclient和httpmime来完成此任务：

import java.io.File;
import java.io.IOException;

import org.apache.http.HttpResponse;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.entity.mime.MultipartEntity;
import org.apache.http.entity.mime.content.FileBody;
import org.apache.http.impl.client.DefaultHttpClient;

public class Uploader {

  public void uploadFile(String endpoint, File file) throws ClientProtocolException, IOException {
    HttpClient httpclient = new DefaultHttpClient();
    HttpPost httpPost = new HttpPost(endpoint);
    FileBody uploadFilePart = new FileBody(file);
    MultipartEntity reqEntity = new MultipartEntity();
    reqEntity.addPart("file", uploadFilePart);
    httpPost.setEntity(reqEntity);
    HttpResponse response = httpclient.execute(httpPost);
    //Check response for success
  }

}

适用于您的示例服务器代码。另见this question。

JAX RS文件上传

1 个答案: