How to Correctly Upload Files Using Java's HttpClient Library to a PHP Server?-PHP Tutorial-php.cn

How to Correctly Upload Files Using Java's HttpClient Library to a PHP Server?

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Release： 2024-12-11 17:37:11

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How to Correctly Upload Files Using Java's HttpClient Library to a PHP Server?

How to Upload a File Using Java HttpClient Library with PHP

Problem:

A Java application using HttpClient library version 4.0 beta2 attempts to upload a file to an Apache server running PHP, but the file is not recognized by the PHP script.

Solution:

The original Java code employed a FileEntity object to transfer the file, which is incorrect. The correct approach is to use a MultipartEntity to encapsulate the file as a multipart/form-data request.

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();
  }
}

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By incorporating these changes, the file upload functionality should work as intended, and the file will be successfully recognized by the PHP script.

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