Why Does My Java HttpClient File Upload to PHP Fail, and How Can I Fix It Using MultipartEntity?-PHP Tutorial-php.cn

Why Does My Java HttpClient File Upload to PHP Fail, and How Can I Fix It Using MultipartEntity?

Mary-Kate Olsen

Release： 2024-12-09 17:52:10

Original

192 people have browsed it

Why Does My Java HttpClient File Upload to PHP Fail, and How Can I Fix It Using MultipartEntity?

Uploading a File using Java HttpClient with PHP

When attempting to upload a file to an Apache server with PHP using Java HttpClient library version 4.0 beta2, an issue arises where the PHP script fails to detect the file uploaded by the Java application.

In the given Java code snippet, the error lies in the usage of a FileEntity to encapsulate the file data. The corrected Java class below uses a MultipartEntity instead, which is essential for multipart/form-data uploads:

import java.io.File;
import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.HttpVersion;
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.ContentBody;
import org.apache.http.entity.mime.content.FileBody;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.params.CoreProtocolPNames;
import org.apache.http.util.EntityUtils;

public class PostFile {
    public static void main(String[] args) throws Exception {
        HttpClient httpclient = new DefaultHttpClient();
        httpclient.getParams().setParameter(CoreProtocolPNames.PROTOCOL_VERSION, HttpVersion.HTTP_1_1);

        HttpPost httppost = new HttpPost("http://localhost:9001/upload.php");
        File file = new File("c:/TRASH/zaba_1.jpg");

        MultipartEntity mpEntity = new MultipartEntity();
        ContentBody cbFile = new FileBody(file, "image/jpeg");
        mpEntity.addPart("userfile", cbFile);

        httppost.setEntity(mpEntity);
        System.out.println("executing request " + httppost.getRequestLine());
        HttpResponse response = httpclient.execute(httppost);
        HttpEntity resEntity = response.getEntity();

        System.out.println(response.getStatusLine());
        if (resEntity != null) {
            System.out.println(EntityUtils.toString(resEntity));
        }
        if (resEntity != null) {
            resEntity.consumeContent();
        }

        httpclient.getConnectionManager().shutdown();
    }
}

Copy after login

This correction ensures the file is uploaded properly, and the PHP script's is_uploaded_file() method should return true upon successful file transmission, as intended.

The above is the detailed content of Why Does My Java HttpClient File Upload to PHP Fail, and How Can I Fix It Using MultipartEntity?. For more information, please follow other related articles on the PHP Chinese website!