java之使用HttpURLConnection调用WebService

package hz.vat.invoice.utils.paper;

import java.io.BufferedReader;

import java.io.InputStreamReader;

import java.io.OutputStreamWriter;

import java.net.HttpURLConnection;

import java.net.URL;

/**

 * http协议处理类

 * 

 * @author Joyce

 * 

 */

public class HttpRequest {
public static String doPost(String url, String params) throws Exception {
HttpURLConnection conn = (HttpURLConnection) new URL(url)
.openConnection();
conn.setRequestMethod("POST");
conn.setDoOutput(true);
conn.setDoInput(true);

// int timeout = 300000;

// conn.setConnectTimeout(timeout);

// conn.setReadTimeout(timeout);
// conn.setRequestProperty("Content-type",
// "application/x-www-form-urlencoded");
// conn.setRequestProperty("Connection", "Close");
// conn.setRequestProperty("Content-length",
// String.valueOf(params.length()));
// conn.connect();
if(params!=null){
OutputStreamWriter out = new OutputStreamWriter(conn.getOutputStream(),
"UTF-8");
out.write(params);
out.flush();
out.close();
}

InputStreamReader r = new InputStreamReader(conn.getInputStream(),
"UTF-8");
BufferedReader reader = new BufferedReader(r);
String line = null;
StringBuffer sb = new StringBuffer();
while ((line = reader.readLine()) != null) {
sb.append(line);
}
return sb.toString();
}

}