Java程序中直接调用jsp、 Action

在Java程序中可以直接调用jsp、Struts Action等网络资源，示例代码：

String title = "这是标题";
String url_str = "http://127.0.0.1:8080/struts/login.do?title=";
URL url = new URL(url_str+title);
HttpURLConnection connection = (HttpURLConnection) url.openConnection();
connection.connect();
int code = connection.getResponseCode();
log.info("code========" + code);

注意：若不调用如下代码，则不能调用成功

 

int code = connection.getResponseCode();

 

转载资料1：

//java如何通过url调用远程接口并读取返回信息?
        String ticket = "";//登录凭证
        String url_str = "http://www.sina.com.cn?ticket=";//获取用户认证的帐号URL
        String ticket_url = url_str + ticket;
        URL url = new URL(ticket_url);
        HttpURLConnection connection = (HttpURLConnection) url.openConnection();
        connection.connect();

        int code = connection.getResponseCode();
        if (code == 404) {
            throw new Exception("认证无效，找不到此次认证的会话信息！");
        }
        if (code == 500) {
            throw new Exception("认证服务器发生内部错误！");
        }
        if (code != 200) {
            throw new Exception("发生其它错误，认证服务器返回 " + code);
        }
        InputStream is = connection.getInputStream();
        byte[] response = new byte[is.available()];
        is.read(response);
        is.close();
        if (response == null || response.length == 0) {
            throw new Exception("认证无效，找不到此次认证的会话信息！");
        }
        String userId = new String(response, "GBK");
        System.out.println(userId);

 

转载资料2：

 

 URL u = new URL( url );
  URLConnection uc = u.openConnection();
  HttpURLConnection httpUC = (HttpURLConnection)uc;
//   设置是否向httpUrlConnection输出，因为这个是post请求，参数要放在http正文内，因此需要设为true, 默认情况下是false;
  httpUC.setDoOutput( true );
//   Post 请求不能使用缓存
  httpUC.setUseCaches(false);
  
//  增加更多的请求头信息
  Iterator<String> it = requestHeads.keySet().iterator();
  while( it.hasNext() ){
   String name = it.next(); String value = requestHeads.get( name );
   httpUC.addRequestProperty( name , value );
  }
  
//   设定传送的内容类型是可序列化的java对象
//   (如果不设此项,在传送序列化对象时,当WEB服务默认的不是这种类型时可能抛java.io.EOFException)
  httpUC.setRequestProperty("Content-type", "application/x-java-serialized-object");
//  设定请求的方法为"POST"，默认是GET
  httpUC.setRequestMethod("POST");
  
//   连接，上面的配置必须要在connect之前完成. 不知道是否要连接池??? rhwang 2009-02-27
        httpUC.connect();