我一直在开发一个 java/android 应用程序，我需要能够从设备拍照并将其上传到我的 ubuntu 服务器上，该服务器在我的 raspberry pi 2 上运行。
我想在 php 上测试上传功能，所以我做了一个简单的 html 页面，转发到我的 upload.php 文件。
index.html
<!DOCTYPE html>
<html>
<body>
<form action="upload.php" method="post" enctype="multipart/form-data">
Select image to upload:
<input type="file" name="fileToUpload" id="fileToUpload">
<input type="submit" value="Upload Image" name="submit">
</form>
</body>
</html>
upload.php
<?php
$target_dir = "uploads/";
$target_file = $target_dir . basename($_FILES["fileToUpload"]["name"]);
$uploadOk = 1;
$imageFileType = pathinfo($target_file,PATHINFO_EXTENSION);
// Check if image file is a actual image or fake image
if(isset($_POST["submit"])) {
$check = getimagesize($_FILES["fileToUpload"]["tmp_name"]);
if($check !== false) {
echo "File is an image - " . $check["mime"] . ".";
$uploadOk = 1;
} else {
echo "File is not an image.";
$uploadOk = 0;
}
}
// Check if file already exists
if (file_exists($target_file)) {
echo "Sorry, file already exists.";
$uploadOk = 0;
}
// Check file size
if ($_FILES["fileToUpload"]["size"] > 500000) {
echo "Sorry, your file is too large.";
$uploadOk = 0;
}
// Allow certain file formats
if($imageFileType != "jpg" && $imageFileType != "png" && $imageFileType != "jpeg"
&& $imageFileType != "gif" ) {
echo "Sorry, only JPG, JPEG, PNG & GIF files are allowed.";
$uploadOk = 0;
}
// Check if $uploadOk is set to 0 by an error
if ($uploadOk == 0) {
echo "Sorry, your file was not uploaded.";
// if everything is ok, try to upload file
} else {
if (move_uploaded_file($_FILES["fileToUpload"]["tmp_name"], $target_file)) {
echo "The file ". basename( $_FILES["fileToUpload"]["name"]). " has been uploaded.";
} else {
echo "Sorry, there was an error uploading your file.";
}
}
?>
我现在想通过 java 来做这个，所以我创建了一个 java 类来完成这个:
ServerManager.java
package servertest;
import java.io.DataInputStream;
import java.io.DataOutputStream;
import java.io.File;
import java.io.IOException;
import java.net.HttpURLConnection;
import java.util.logging.Level;
import java.util.logging.Logger;
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;
/**
* Created by Pranav on 5/9/2015.
*/
public class ServerManager {
public static void main(String args[]) {
try {
new ServerManager().uploadFile("C:\\Users\\Pranav\\Downloads\\ic_server_test.png");
} catch (IOException ex) {
Logger.getLogger(ServerManager.class.getName()).log(Level.SEVERE, null, ex);
}
}
public int uploadFile(String sourceFileUri) throws IOException {
String userHome = System.getProperty("user.home");
//Create Client
HttpClient httpClient = new DefaultHttpClient();
httpClient.getParams().setParameter(CoreProtocolPNames.PROTOCOL_VERSION, HttpVersion.HTTP_1_1);
HttpPost httppost = new HttpPost("http://192.168.0.14/upload.php");
File file = new File("C:\\Users\\Pranav\\Downloads\\ic_server_test.png");
MultipartEntity mpEntity = new MultipartEntity();
ContentBody contentFile = new FileBody(file);
mpEntity.addPart("userfile", contentFile);
httppost.setEntity(mpEntity);
System.out.println("executing request " + httppost.getRequestLine());
HttpResponse response = httpClient.execute(httppost);
HttpEntity resEntity = response.getEntity();
if (!(response.getStatusLine().toString()).equals("HTTP/1.1 200 OK")) {
System.out.println("SUCCESSFUL: Image has been uploaded");
} else {
System.err.println("ERROR: Could not upload the image");
}
System.out.println(response.getStatusLine());
if (resEntity != null) {
System.out.println(EntityUtils.toString(resEntity));
}
if (resEntity != null) {
resEntity.consumeContent();
}
httpClient.getConnectionManager().shutdown();
return 0;
}
}
但是，当我运行这段代码时，我总是得到这样的响应:
结果
executing request POST http://192.168.0.14/upload.php HTTP/1.1
ERROR: Could not upload the image
HTTP/1.1 200 OK
Sorry, file already exists.Sorry, only JPG, JPEG, PNG & GIF files are allowed.Sorry, your file was not uploaded.
我怀疑这是因为数据没有传输，因为它总是通过大小测试，而且可能是 0 字节。谁能帮我解决这个问题？提前致谢!
最佳答案
好的，我想通了我的问题。我在没有 MultipartEntity 的情况下发送请求，因此 php 文件无法读取文件。
这是我的新代码
private static final String UPLOAD_URL = SERVER_IP + "/upload.php";
public int uploadImageToServer(String fileLocation) throws IOException {
// the URL where the file will be posted
String postReceiverUrl = "http://192.168.0.14/upload.php";
// new HttpClient
HttpClient httpClient = new DefaultHttpClient();
// post header
HttpPost httpPost = new HttpPost(postReceiverUrl);
//Create File
File file = new File(fileLocation);
FileBody fileBody = new FileBody(file);
//Set up HTTP post
MultipartEntity reqEntity = new MultipartEntity(HttpMultipartMode.BROWSER_COMPATIBLE);
reqEntity.addPart("fileToUpload", fileBody);
httpPost.setEntity(reqEntity);
// execute HTTP post request
HttpResponse response = httpClient.execute(httpPost);
HttpEntity resEntity = response.getEntity();
if (resEntity != null) {
String responseStr = EntityUtils.toString(resEntity).trim();
// you can add an if statement here and do other actions based on the response
System.out.println(responseStr);
System.out.println(response.getStatusLine());
}
return 0;
}
关于java - 如何通过 HTTP 使用 Java 到 PHP 5 将文件上传到服务器，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/30157637/