1、您最好的选择可能是使用第三方库,如HttpClient或HTMLUnit。
2、如果你喜欢用标准api,也很简单。代码如下:

3、Stdata = URLEncoder.encode("key1", "UTF-8") + "=" +
URLEncoder.encode("value1", "UTF-8");
data += "&" + URLEncoder.encode("key2", "UTF-8") + "=" +
URLEncoder.encode("value2", "UTF-8");
URL url = new URL("http://hostname:80/cgi");
URLConnection conn = url.openConnection();
conn.setDoOutput(true);
OutputStreamWriter wr = new OutputStreamWriter(conn.getOutputStream());
wr.write(data);
wr.flush();
BufferedReader rd = new BufferedReader(
new InputStreamReader(conn.getInputStream()));
String line;
while ((line = rd.readLine()) != null) {
}
wr.close();
rd.close();