


Why Does My Java HttpClient File Upload to PHP Fail, and How Can I Fix It?
Dec 12, 2024 pm 04:22 PMHow to Successfully Upload a File Using Java HttpClient Library and PHP
When attempting to upload a file from a Java application to an Apache server running PHP using the Jakarta HttpClient library, you may encounter the following issue:
Problem Statement:
A Java application using the Jakarta HttpClient library to upload a file to an Apache server with PHP fails to register the file in PHP. The is_uploaded_file method returns false, and the $_FILES variable remains empty.
Solution:
The provided Java code contained an error that prevented successful file upload. The following corrected Java class addresses this issue:
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(); } }
Explanation:
The key difference between the previous and corrected Java code lies in the use of MultipartEntity. The PHP script expects data in a multipart/form-data format, which the previous code did not adhere to. By using MultipartEntity, the data is formatted correctly and the file upload process can be completed successfully.
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