以为要做android项目的文件上传，在CSDN看到了鸿洋_大神的《从原理角度解析Android （Java） http 文件上传》http://blog.csdn.net/lmj623565791/article/details/23781773
从原理角度解析Android （Java） http 文件上传
已经讲的很详细，但是唯一不足的是，提供的源码是Java版本的，然后我又实现了一个android版本的文件上传
下面是主要代码：
/**
* Create a thread to upload the file.
* @param filepath
* @param uploadUrl
*/
public void startUploadFile(final String filepath, final String uploadUrl) {
final Message msg = Message.obtain(); // Get the Message object
// Create a new thread to do the upload
Thread thread = new Thread(new Runnable() {
@Override
public void run() {
// TODO Auto-generated method stub
boolean flag = uploadFile(filepath, uploadUrl); // Call the upload file function
if(flag) {
msg.what = 1; // Upload file succeeded.
} else {
msg.what = 0; // Upload file failed.
}
handler.sendMessage(msg);
}
});
thread.start(); // Start the thread
}
/**
* Upload the specified file to remote server.
* @param filepath The path of the local file.
* @param uploadUrl The server url.
* @return The upload status.
*/
public boolean uploadFile(String filepath, String uploadUrl) {
boolean status = true;
String end = "\r\n";
String twoHyphens = "--";
String boundary = "******";
try
{
URL url = new URL(uploadUrl);
HttpURLConnection httpURLConnection = (HttpURLConnection) url.openConnection();
// Set the size of the transfer stream, in case that the application
// collapses due to small memory, this method is used when we don't
// know the size of the content, we use HTTP request without cache
httpURLConnection.setChunkedStreamingMode(128 * 1024);// 128K
// Set the input and output
httpURLConnection.setDoInput(true);
httpURLConnection.setDoOutput(true);
httpURLConnection.setUseCaches(false);
// Set the HTTP method
httpURLConnection.setRequestMethod("POST");
httpURLConnection.setRequestProperty("Connection", "Keep-Alive");
httpURLConnection.setRequestProperty("Charset", "UTF-8");
httpURLConnection.setRequestProperty("Content-Type",
"multipart/form-data;boundary=" + boundary);
// Get outputstream according to the url connection
DataOutputStream dos = new DataOutputStream(httpURLConnection.getOutputStream());
// Write the HTTP POST header
dos.writeBytes(twoHyphens + boundary + end);
dos.writeBytes("Content-Disposition: form-data; name=\"uploadedfile\"; filename=\""
+ filepath.substring(filepath.lastIndexOf("/") + 1)
+ "\"" + end);
dos.writeBytes(end);
FileInputStream fis = new FileInputStream(filepath);
int bufferSize = 8 * 1024; // The size of the buffer, 8KB.
byte[] buffer = new byte[bufferSize];
int length = 0;
while ((length = fis.read(buffer)) != -1) {
// Write data to DataOutputStream
dos.write(buffer, 0, length);
}
dos.writeBytes(end);
dos.writeBytes(twoHyphens + boundary + twoHyphens + end);
fis.close(); // Close the FileInputStream.
dos.flush(); // Flush the data to DataOutputStream.
// Get the content of the response
InputStream is = httpURLConnection.getInputStream();
InputStreamReader isr = new InputStreamReader(is, "utf-8");
BufferedReader br = new BufferedReader(isr, 8 * 1024);
String result = br.readLine();
Log.d(Tag, result);
// dos.close(); // Will respond I/O exception if closes.
} catch (Exception e) {
e.printStackTrace();
status = true;
}
return status;
}
private static final String BOUNDARY = "----WebKitFormBoundaryT1HoybnYeFOGFlBR";
/**
*
* @param params
* 传递的普通参数
* @param uploadFile
* 需要上传的文件名
* @param fileFormName
* 需要上传文件表单中的名字
* @param newFileName
* 上传的文件名称，不填写将为uploadFile的名称
* @param urlStr
* 上传的服务器的路径
* @throws IOException
*/
public void uploadForm(Map<String, String> params, String fileFormName,
File uploadFile, String newFileName, String urlStr)
throws IOException {
if (newFileName == null || newFileName.trim().equals("")) {
newFileName = uploadFile.getName();
}
StringBuilder sb = new StringBuilder();
/**
* 普通的表单数据
*/
for (String key : params.keySet()) {
sb.append("--" + BOUNDARY + "\r\n");
sb.append("Content-Disposition: form-data; name=\"" + key + "\""
+ "\r\n");
sb.append("\r\n");
sb.append(params.get(key) + "\r\n");
}
/**
* 上传文件的头
*/
sb.append("--" + BOUNDARY + "\r\n");
sb.append("Content-Disposition: form-data; name=\"" + fileFormName
+ "\"; filename=\"" + newFileName + "\"" + "\r\n");
sb.append("Content-Type: image/jpeg" + "\r\n");// 如果服务器端有文件类型的校验，必须明确指定ContentType
sb.append("\r\n");
byte[] headerInfo = sb.toString().getBytes("UTF-8");
byte[] endInfo = ("\r\n--" + BOUNDARY + "--\r\n").getBytes("UTF-8");
System.out.println(sb.toString());
URL url = new URL(urlStr);
HttpURLConnection conn = (HttpURLConnection) url.openConnection();
conn.setRequestMethod("POST");
conn.setRequestProperty("Content-Type",
"multipart/form-data; boundary=" + BOUNDARY);
conn.setRequestProperty("Content-Length", String
.valueOf(headerInfo.length + uploadFile.length()
+ endInfo.length));
conn.setDoOutput(true);
OutputStream out = conn.getOutputStream();
InputStream in = new FileInputStream(uploadFile);
out.write(headerInfo);
byte[] buf = new byte[1024];
int len;
while ((len = in.read(buf)) != -1)
out.write(buf, 0, len);
out.write(endInfo);
in.close();
out.close();
if (conn.getResponseCode() == 200) {
System.out.println("上传成功");
}
}