http 上传文件的方法_Linux教程

/**

*

* sendMultipartDataToHttpServer

* 使用post方法请求web服务器，并且当表单数据为：multipart/form-data格式。 http请求使用{@link#HTTP_ENCODING}编码<br/>

* 返回json数据，支持文件名中文上传和多文件上传，不支持断点上传，要正确编码服务端返回{@link#HTTP_ENCODING}编码<br/>

* @param url

* @param files 文件表单域

* @param fields 非文件表单域

* @return JSONObject

* @throws Exception

* @exception

* @since 1.0.0

*/

public static JSONObject sendMultipartDataToHttpServer(URL url,

final Map<String, File> files, final Map<String, String> fields,

final UsernamePasswordCredentials credentials) throws IOException ,JSONException,Exception{

URL myurl = null;

String queryString = "";

// 其他的表单域

if (fields != null) {

for (Map.Entry<String, String> entry : fields.entrySet()) {

queryString += "&" + URLEncoder.encode(entry.getKey(),HTTP_ENCODING) + "="

+ URLEncoder.encode(entry.getValue(), HTTP_ENCODING);

}

if (!queryString.equals("")) {

queryString = queryString.replaceFirst("&", "?");

} else {

}

myurl = new URL(url.getProtocol(), url.getHost(),url.getPort(), url.getPath()

+ queryString);

HttpURLConnection conn = (HttpURLConnection) myurl.openConnection();

conn.setConnectTimeout(UPLOAD_REQUEST_TIMEOUT);

conn.setRequestMethod(HTTP_METHOD.POST.toString());

conn.setDoInput(true);

conn.setDoOutput(true);

conn.setUseCaches(false);

String boundary = "laohuidi_" + java.util.UUID.randomUUID().toString()

+ "_laohuidi";

conn.setRequestProperty(

"Accept",

"image/gif,image/x-xbitmap,image/jpeg,image/pjpeg,application/vnd.ms-excel,application/vnd.ms-powerpoint,application/msword,application/x-shockwave-flash,application/x-quickviewplus,*/*");

conn.setRequestProperty("keep-alive", "300");

conn.setRequestProperty(

"user-agent",

"Mozilla/5.0 (Windows; U; Windows NT 5.2; zh-CN; rv:1.9.1.6) Gecko/20091201 Firefox/3.5.6 GTB6");

conn.setRequestProperty("accept-language", "zh-cn,zh;q=0.5");

conn.setRequestProperty("Connection", "Keep-Alive");

conn.setRequestProperty("Content-Type", "multipart/form-data;boundary="+ boundary);

DataOutputStream dos = new DataOutputStream(conn.getOutputStream());

// 乱码问题可以试下 PrintWriter out = new PrintWriter(new

// OutputStreamWriter(connection.getOutputStream(),"utf-8"));

dos = new DataOutputStream(conn.getOutputStream());

int bytesRead, bytesAvailable, bufferSize;

byte[] buffer;

int maxBufferSize = IO_BUFFER_SIZE;

String tem = "";

if(files!=null)

for (Map.Entry<String, File> entry : files.entrySet()){

// 分隔符开头

dos.writeBytes(TWO_HYPHENS + boundary + LINEND);

// create a buffer of maximum size

FileInputStream fileInputStream = new FileInputStream(entry.getValue());

bytesAvailable = fileInputStream.available();

bufferSize = Math.min(bytesAvailable, maxBufferSize);

buffer = new byte[bufferSize];

// read file and write it into form...

bytesRead = fileInputStream.read(buffer, 0, bufferSize);

tem = entry.getValue().getName();

dos.writeBytes("Content-Disposition:form-data;name=\""+entry.getKey()+"\";"+ "filename=\"");

dos.writeUTF(tem);// 中文的文件名使用这里

dos.writeBytes("\"" + LINEND);

dos.writeBytes("Content-Type:image/jpg" + LINEND + LINEND);//类型的判断暂时不处理

while (bytesRead > 0) {

dos.write(buffer, 0, bufferSize);

bytesAvailable = fileInputStream.available();

bufferSize = Math.min(bytesAvailable, maxBufferSize);

bytesRead = fileInputStream.read(buffer, 0, bufferSize);

}

// close streams

fileInputStream.close();

dos.writeBytes(LINEND);

}

// http 结束符

dos.writeBytes(TWO_HYPHENS + boundary + TWO_HYPHENS);

dos.writeBytes(LINEND);

dos.flush();

dos.close();

// 返回类型

String responseType = conn.getHeaderField("Content-Type");

// 正常返回而且必须为json类型

if (conn.getResponseCode() == HttpURLConnection.HTTP_OK

&& responseType != null

&& responseType.indexOf(HTTP_JSON_TYPE) >= 0) {

responseType = (convertStreamToString(conn.getInputStream()));

} else {

responseType = "{}";

}

try{conn.disconnect();}catch(Exception e){}

return new JSONObject(responseType);

}

http 上传文件的方法