java 模拟登陆报错
我网上找了模拟网页登陆的代码,如下:
String surl = "https:......./login";
/**
* 首先要和URL下的URLConnection对话。 URLConnection可以很容易的从URL得到。比如: // Using
* java.net.URL and //java.net.URLConnection
*/
URL url = new URL(surl);
URLConnection connection = url.openConnection();
/**
* 然后把连接设为输出模式。URLConnection通常作为输入来使用,比如下载一个Web页。
* 通过把URLConnection设为输出,你可以把数据向你个Web页传送。下面是如何做:
*/
connection.setDoOutput(true);
/**
* 最后,为了得到OutputStream,简单起见,把它约束在Writer并且放入POST信息中,例如: ...
*/
OutputStreamWriter out = new OutputStreamWriter(connection.getOutputStream(), "UTF-8");
out.write("email=.......&password=........"); //post的关键所在!
// remember to clean up
out.flush();
out.close();
String cookieVal = connection.getHeaderField("Set-Cookie");
String s = "https:.......";
//重新打开一个连接
url = new URL(s);
HttpURLConnection resumeConnection = (HttpURLConnection) url
.openConnection();
if (cookieVal != null) {
//发送cookie信息上去,以表明自己的身份,否则会被认为没有权限
resumeConnection.setRequestProperty("Cookie", cookieVal);
}
resumeConnection.connect();
InputStream urlStream = resumeConnection.getInputStream();
BufferedReader bufferedReader = new BufferedReader(
new InputStreamReader(urlStream));
String ss = null;
String total = "";
while ((ss = bufferedReader.readLine()) != null) {
total += ss;
}
IOUtils.write(total, new FileOutputStream("d:/index.html"));
bufferedReader.close();
运行报错,错误如下:
错误: 找不到或无法加载主类
不知道什么原因,求解答,谢谢