java如何调用http接口？

有一个HTTP的接口地址，我需要加上一些参数调用它，用于传递参数，比如http://www.csdn.net?username=abc但是在程序里面如何能调用http接口，就是相当于在浏览器中执行一下这个url地址。菜鸟请教高手

解决方案 »

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    URL url = null;
    HttpURLConnection httpurlconnection = null;
    try
     {
      url = new URL("http://www.csdn.net");     //以post方式请求
      httpurlconnection = (HttpURLConnection) url.openConnection();
      httpurlconnection.setDoOutput(true);
      httpurlconnection.setRequestMethod("POST");
       String username="username=abc";
      httpurlconnection.getOutputStream().write(username.getBytes());
      httpurlconnection.getOutputStream().flush();
      httpurlconnection.getOutputStream().close();

      //获取响应代码
      int code = httpurlconnection.getResponseCode();
      System.out.println("code   " + code);      //获取页面内容
      java.io.InputStream in= httpurlconnection .getInputStream();
      java.io.BufferedReader breader =
new BufferedReader(new InputStreamReader(in , "gb2312"));
String str=breader.readLine());
while(st != null){
System.out.println(str);
str=breader.readLine());
}     }
    catch(Exception e)
    {
      e.printStackTrace();
    }
    finally
    {
      if(httpurlconnection!=null)
        httpurlconnection.disconnect();
    }
jTextPane1.setPage("http://www.sohu.com");
java.io.InputStream l_urlStream;
java.net.URL l_url = new  java.net.URL("http://www.csdn.net");
java.net.HttpURLConnection l_connection = (java.net.HttpURLConnection)                                                   l_url.openConnection();l_connection = (java.net.HttpURLConnection) l_url.openConnection();
l_connection.connect();
l_urlStream = l_connection.getInputStream();
java.io.BufferedReader l_reader = new BufferedReader(new InputStreamReader(l_urlStream, "big5"));
不太明白楼主得意思，用script也行吧？可以自己设参数啊
<script language="javascript">
function tourl(){var username = "abc"; //变量1
document.URL = "http://www.csdn.net?username="
               + username+ ";
}
</script>
<BODY> <input type=button value=go onclick="tourl()"></BODY>