我已经提到了这个链接Sending files using POST with HttpURLConnection
使用以下代码，我尝试将文件POST到本地PHP服务器。它总是在我的PHP文件中返回文件大小0
public class FileUpload2 {
String CRLF = "\r\n";
/**
* @param args
* @throws Exception
*/
public static void main(String[] args) throws Exception {
new FileUpload2().put("http://localhost/test/test.php");
}
public void put(String targetURL) throws Exception {
String BOUNDRY = "==================================";
HttpURLConnection conn = null;
try {
// These strings are sent in the request body. They provide
// information about the file being uploaded
String contentDisposition = "Content-Disposition: form-data; name=\"userfile\"; filename=\"test.txt\"";
String contentType = "Content-Type: application/octet-stream";
// This is the standard format for a multipart request
StringBuffer requestBody = new StringBuffer();
requestBody.append("--");
requestBody.append(BOUNDRY);
requestBody.append(CRLF);
requestBody.append(contentDisposition);
requestBody.append(CRLF);
requestBody.append(contentType);
requestBody.append(CRLF);
requestBody.append("Content-Transfer-Encoding: binary" + CRLF);
requestBody.append(CRLF);
requestBody.append(new String(getFileBytes("test.txt")));
requestBody.append("--");
requestBody.append(BOUNDRY);
requestBody.append("--");
requestBody.append(CRLF);
// Make a connect to the server
URL url = new URL(targetURL);
conn = (HttpURLConnection) url.openConnection();
conn.setDoOutput(true);
conn.setDoInput(true);
conn.setUseCaches(false);
conn.setRequestMethod("POST");
conn.setRequestProperty("Connection", "Keep-Alive");
conn.setRequestProperty("Content-Type",
"multipart/form-data; boundary=" + BOUNDRY);
conn.setRequestProperty("Cache-Control", "no-cache");
// Send the body
DataOutputStream dataOS = new DataOutputStream(
conn.getOutputStream());
dataOS.writeBytes(requestBody.toString());
dataOS.flush();
dataOS.close();
// Ensure we got the HTTP 200 response code
int responseCode = conn.getResponseCode();
if (responseCode != 200) {
throw new Exception(String.format(
"Received the response code %d from the URL %s",
responseCode, url));
}
// Read the response
InputStream is = conn.getInputStream();
ByteArrayOutputStream baos = new ByteArrayOutputStream();
byte[] bytes = new byte[1024];
int bytesRead;
while ((bytesRead = is.read(bytes)) != -1) {
baos.write(bytes, 0, bytesRead);
}
byte[] bytesReceived = baos.toByteArray();
baos.close();
is.close();
String response = new String(bytesReceived);
System.out.println(response);
// TODO: Do something here to handle the 'response' string
} finally {
if (conn != null) {
conn.disconnect();
}
}
}
public byte[] getFileBytes(String file) throws IOException {
ByteArrayOutputStream ous = null;
InputStream ios = null;
try {
byte[] buffer = new byte[4096];
ous = new ByteArrayOutputStream();
ios = this.getClass().getResourceAsStream(file);
int read = 0;
while ((read = ios.read(buffer)) != -1)
ous.write(buffer, 0, read);
} finally {
try {
if (ous != null)
ous.close();
} catch (IOException e) {
// swallow, since not that important
}
try {
if (ios != null)
ios.close();
} catch (IOException e) {
// swallow, since not that important
}
}
return ous.toByteArray();
}
PHP文件
<?php
move_uploaded_file($_FILES['userfile']["tmp_name"], "test.txt");
//file_put_contents("test", "asd".$_FILES['userfile']);
print_r($_FILES);
print_r($_REQUEST);
?>
我得到的结果是
Array
(
[userfile] => Array
(
[name] => test.txt
[type] =>
[tmp_name] =>
[error] => 3
[size] => 0
)
)
Array
(
)
提前致谢！
答案 0 :(得分：0)
最后，我通过添加apache http客户端库而不是HttpUrlConnection解决了这个问题。
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* information on the Apache Software Foundation, please see
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*/
import java.io.BufferedReader;
import java.io.File;
import java.io.InputStream;
import java.io.InputStreamReader;
import org.apache.http.HttpEntity;
import org.apache.http.client.methods.CloseableHttpResponse;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.entity.ContentType;
import org.apache.http.entity.mime.MultipartEntityBuilder;
import org.apache.http.entity.mime.content.FileBody;
import org.apache.http.entity.mime.content.StringBody;
import org.apache.http.impl.client.CloseableHttpClient;
import org.apache.http.impl.client.HttpClients;
import org.apache.http.util.EntityUtils;
/**
* Example how to use multipart/form encoded POST request.
*/
public class ClientMultipartFormPost {
public static void main(String[] args) throws Exception {
/*if (args.length != 1) {
System.out.println("File path not given");
System.exit(1);
}*/
CloseableHttpClient httpclient = HttpClients.createDefault();
InputStream responseStream = null ;
String responseString = "" ;
try {
HttpPost httppost = new HttpPost("http://localhost/test/test.php");
FileBody bin = new FileBody(new File("D:/Jeyasithar/Workspace/Java/TestJava/src/test.txt"));
StringBody comment = new StringBody("A binary file of some kind", ContentType.TEXT_PLAIN);
HttpEntity reqEntity = MultipartEntityBuilder.create()
.addPart("bin", bin)
.addPart("comment", comment)
.build();
httppost.setEntity(reqEntity);
System.out.println("executing request " + httppost.getRequestLine());
CloseableHttpResponse response = httpclient.execute(httppost);
try {
System.out.println("----------------------------------------");
System.out.println(response.getStatusLine());
HttpEntity resEntity = response.getEntity();
if (resEntity != null) {
System.out.println("Response content length: " + resEntity.getContentLength());
responseStream = resEntity.getContent() ;
if (responseStream != null){
BufferedReader br = new BufferedReader (new InputStreamReader (responseStream)) ;
String responseLine = br.readLine() ;
String tempResponseString = "" ;
while (responseLine != null){
tempResponseString = tempResponseString + responseLine + System.getProperty("line.separator") ;
responseLine = br.readLine() ;
}
br.close() ;
if (tempResponseString.length() > 0){
responseString = tempResponseString ;
System.out.println(responseString);
}
}
}
EntityUtils.consume(resEntity);
} finally {
response.close();
}
} finally {
httpclient.close();
}
}
}