HttpClient 和HttpConnection 两种方式POST文件

/**
* HttpClientPOST文件
* @param URL
* @param content 传params时，此参为""
* @param params
* @param fileName
* @return
*/
public String postUrl(String URL,String content,Map<String,String> params,String fileName){
String result = "";
PostMethod postMethod = new PostMethod(URL);
RequestEntity requestEntity;
String CHARSET = "UTF-8";
InputStream is = null;
InputStreamReader isr = null;
BufferedReader br = null;
String tmp ;
try {
postMethod.getParams().setParameter(HttpMethodParams.RETRY_HANDLER, new DefaultHttpMethodRetryHandler());
postMethod.getParams().setContentCharset(CHARSET);
if (content != null) {
if(fileName == null){
requestEntity = new StringRequestEntity(content,"text/html",CHARSET);
}else{
Part [] parts = new Part[params.size()+1] ;
int i=0;
for (Map.Entry<String, String> entry : params.entrySet()){
parts[i++]=new StringPart(entry.getKey(), entry.getValue());
}
parts[i] = new FilePart("pic", new File(fileName),"multipart/form-data",CHARSET);
requestEntity = new MultipartRequestEntity(parts,postMethod.getParams());
}
postMethod.setRequestEntity(requestEntity);
}
httpClient.executeMethod(postMethod);
if(200==postMethod.getStatusCode()){
is = postMethod.getResponseBodyAsStream();//返回Header里得不到Content-Length 长度或者长度超过1024*1024 会警告：Going to buffer response body of large or unknown size Using getResponseBodyAsStream instead is recommended
isr = new InputStreamReader(is);
br = new BufferedReader(isr);
while(( tmp = br.readLine())!=null){
result += tmp;
}
}else{
log.error(postMethod.getStatusLine());
}
} catch (Exception e) {
e.printStackTrace();
}finally{
postMethod.releaseConnection();
try {
is.close();
isr.close();
br.close();
} catch (IOException e) {
e.printStackTrace();
}
}
return result;
}

/**
* HttpConnection提交数据
* @param str URL
* @param params 提交参数
* @param fileName 提交文件名
* @return
*/
public String httpConn(String str,Map<String, String> params,String fileName){
String result = null;
URL url ;
HttpURLConnection conn = null ;
InputStream is = null;
DataInputStream dis = null;
DataOutputStream dos = null;
StringBuilder sb = null;
String BOUNDARY = java.util.UUID.randomUUID().toString();
String PREFIX = "--", LINEND = "\r\n";
String MULTIPART_FROM_DATA = "multipart/form-data";
String CHARSET = "UTF-8";
try {
System.setProperty("sun.net.http.allowRestrictedHeaders", "true");
System.getProperties().setProperty("http.proxyHost",proxy);
System.getProperties().setProperty("http.proxyPort",port);
url = new URL(str);
conn = (HttpURLConnection) url.openConnection();
conn.setRequestMethod("POST");
conn.setUseCaches(false);
conn.setRequestProperty("Proxy-Connection", "Keep-Alive");
conn.setRequestProperty("Charsert", CHARSET);
conn.setRequestProperty("Content-Type",MULTIPART_FROM_DATA+ ";boundary=" + BOUNDARY);
conn.setDoOutput(true);
conn.setDoInput(true);
conn.setUseCaches(false);
dos = new DataOutputStream(conn.getOutputStream());
sb = new StringBuilder();
for (Map.Entry<String, String> entry : params.entrySet()){
sb.append(PREFIX);
sb.append(BOUNDARY);
sb.append(LINEND);
sb.append("Content-Disposition: form-data; name=\"" + entry.getKey() + "\"" + LINEND);
sb.append("Content-Type: text/plain; charset=" + CHARSET + LINEND);
sb.append("Content-Transfer-Encoding: 8bit" + LINEND);
sb.append(LINEND);
sb.append(entry.getValue());
sb.append(LINEND);
}
if(log.isInfoEnabled())
log.info(sb);
dos.write(sb.toString().getBytes());
sb.delete(0, sb.length());
sb.reverse();
if(fileName!=null){
sb.append(PREFIX);
sb.append(BOUNDARY);
sb.append(LINEND);
sb.append("Content-Disposition: form-data; name=\"pic\"; filename=\"" + fileName + "\"" + LINEND);
sb.append("Content-Type: application/octet-stream; charset=" + CHARSET + LINEND);
sb.append("Content-Transfer-Encoding: 8bit" + LINEND);
sb.append(LINEND);
if(log.isInfoEnabled())
log.info(sb);
dos.write(sb.toString().getBytes());
InputStream img = new FileInputStream(fileName);
byte[] buffer = new byte[1024];
int len = 0;
while ((len = img.read(buffer)) != -1){
dos.write(buffer, 0, len);
}
img.close();
dos.write(LINEND.getBytes());
}
// 请求结束标志
String end_data = PREFIX + BOUNDARY + PREFIX + LINEND;
if(log.isInfoEnabled())
log.info(end_data);
dos.write(end_data.getBytes());
dos.flush();
//dos.close();
int code = conn.getResponseCode();
if(code==200){
is = conn.getInputStream();
}else{
log.error(conn.getResponseCode()+conn.getResponseMessage());
is = conn.getErrorStream();
}
dis = new DataInputStream(is);
byte b[] = new byte[dis.available()];
dis.read(b);
result = new String(b);
} catch (IOException e) {
e.printStackTrace();
}finally{
try {
is.close();
dis.close();
conn.disconnect();
} catch (IOException e) {
e.printStackTrace();
}

}
return result ;
}