将map对象参数转换成String=String&方式

* 将map对象参数转换成String=String&方式

* @param params

* @param charset

* @return

* @throws UnsupportedEncodingException

*/

public static String generateParams(Map<String, String> params,String charset) throws UnsupportedEncodingException{

int flag=0;

StringBuffer ret=new StringBuffer();

Iterator iter = params.entrySet().iterator();

while (iter.hasNext()) {

Map.Entry entry = (Map.Entry) iter.next();

Object key = entry.getKey();

Object val = entry.getValue();

if(val!=null){

if(flag==0){

ret.append(key);

ret.append("=");

if(charset!=null&&!charset.equals("")){

ret.append(URLEncoder.encode(val.toString(), charset));

}else{

ret.append(val.toString());

}

flag++;

}else{

ret.append("&");

ret.append(key);

ret.append("=");

if(charset!=null&&!charset.equals("")){

ret.append(URLEncoder.encode(val.toString(), charset));

}else{

ret.append(val.toString());

}

}

}

}

return ret.toString();

}