发送一个http请求

public class CommonUtil {
// 实现信息传递到接口地址中
public static String postDataToMingYuan(String url, String json) {
OutputStreamWriter out = null;
StringBuilder sTotalString = new StringBuilder();
try {
URL urlTemp = new URL(url);
URLConnection connection = urlTemp.openConnection();
connection.setDoOutput(true);
//connection.setRequestProperty("Content-type", "application/json");
//connection.setRequestProperty("User-Agent","Mozilla/5.0 (Windows; U; Windows NT 5.1; zh-CN; rv:1.9.2.3) Gecko/20100401 Firefox/3.6.3");
//connection.setRequestProperty("Accept","text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8");
//connection.setRequestProperty("Accept-Language","zh-cn,zh;q=0.5");
connection.setConnectTimeout(5*1000); 
connection.setRequestProperty("Accept-Charset", "UTF-8");
        connection.setRequestProperty("contentType", "UTF-8");
out = new OutputStreamWriter(connection.getOutputStream(), "UTF-8");

StringBuffer sb = new StringBuffer();
sb.append("json="+json);
out.write(sb.toString());
out.flush();
String sCurrentLine;
sCurrentLine = "";
InputStream l_urlStream;
l_urlStream = connection.getInputStream();// 发送请求
BufferedReader l_reader = new BufferedReader(new InputStreamReader(l_urlStream,"UTF-8"));//不加编码会出现乱码
while ((sCurrentLine = l_reader.readLine()) != null) {
sTotalString.append(sCurrentLine);
}
} catch (Exception e) {
e.printStackTrace();
} finally {
if (null != out) {
try {
out.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
return sTotalString.toString();
}
}