public static void loginBai() {
URL url = null;
HttpURLConnection httpurlconnection = null;
try {
url = new URL("http://www..com/");
httpurlconnection = (HttpURLConnection) url.openConnection();
httpurlconnection.setRequestProperty("User-Agent",
"Internet Explorer");
httpurlconnection.setRequestProperty("Host", "www..com");
httpurlconnection.connect();
String cookie0 = httpurlconnection.getHeaderField("Set-Cookie");
System.out.println(cookie0);//打印出cookie
httpurlconnection.disconnect();
// String cookie0 =
// "BAIDUID=:FG=1;BDSTAT=;
// BDUSE=deleted";
url = new URL("http://passport..com/?login");
String strPost = "username=xxxxxx&password=yyyyyyy&mem_pass=on";
httpurlconnection = (HttpURLConnection) url.openConnection();
httpurlconnection.setFollowRedirects(true);
httpurlconnection.setInstanceFollowRedirects(true);
httpurlconnection.setDoOutput(true); // 需要向服务器写数据
httpurlconnection.setDoInput(true); //
httpurlconnection.setUseCaches(false); // 获得服务器最新的信息
httpurlconnection.setAllowUserInteraction(false);
httpurlconnection.setRequestMethod("POST");
httpurlconnection
.addRequestProperty(
"Accept",
"image/gif, image/x-xbitmap, image/jpeg, image/pjpeg, application/x-shockwave-flash, application/msword, application/vnd.ms-excel, application/vnd.ms-powerpoint, application/x-silverlight, */*");
httpurlconnection
.setRequestProperty("Referer",
"http://passport..com/?login&tpl=mn&u=http%3A//www..com/");
httpurlconnection.setRequestProperty("Accept-Language", "zh-cn");
httpurlconnection.setRequestProperty("Content-Type",
"application/x-www-form-urlencoded");
httpurlconnection.setRequestProperty("Accept-Encoding",
"gzip, deflate");
httpurlconnection
.setRequestProperty(
"User-Agent",
"Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1; Foxy/1; .NET CLR 2.0.50727;MEGAUPLOAD 1.0)");
httpurlconnection.setRequestProperty("Host", "passport..com");
httpurlconnection.setRequestProperty("Content-Length", strPost
.length()
+ "");
httpurlconnection.setRequestProperty("Connection", "Keep-Alive");
httpurlconnection.setRequestProperty("Cache-Control", "no-cache");
httpurlconnection.setRequestProperty("Cookie", cookie0);
httpurlconnection.getOutputStream().write(strPost.getBytes());
httpurlconnection.getOutputStream().flush();
httpurlconnection.getOutputStream().close();
httpurlconnection.connect();
int code = httpurlconnection.getResponseCode();
System.out.println("code " + code);
String cookie1 = httpurlconnection.getHeaderField("Set-Cookie");
System.out.print(cookie0 + "; " + cookie1);
httpurlconnection.disconnect();
url = new URL("http://www..com/");
httpurlconnection = (HttpURLConnection) url.openConnection();
httpurlconnection.setRequestProperty("User-Agent",
"Internet Explorer");
httpurlconnection.setRequestProperty("Host", "www..com");
httpurlconnection.setRequestProperty("Cookie", cookie0 + "; "
+ cookie1);
httpurlconnection.connect();
InputStream urlStream = httpurlconnection.getInputStream();
BufferedInputStream buff = new BufferedInputStream(urlStream);
Reader r = new InputStreamReader(buff, "gbk");
BufferedReader br = new BufferedReader(r);
StringBuffer strHtml = new StringBuffer("");
String strLine = null;
while ((strLine = br.readLine()) != null) {
strHtml.append(strLine + "\r\n");
}
System.out.print(strHtml.toString());
} catch (Exception e) {
e.printStackTrace();
} finally {
if (httpurlconnection != null)
httpurlconnection.disconnect();
}
}
呵呵，改了下程序中错误的地方。学习了，原来这样也可以。
以前只知道可以这样做，还从来没有花过心思去做过。
阅读了些代码，真是获益匪浅啊。
程序可以运行了，用户名和密码改为你的帐户就可以直接运行了。可以使用，但不能一直使用啊，如果用多了网络给你个验证码，就是神仙也不行了。
B. java程序实现登陆。用户没有登录但访问非登录的页面，使用过滤器跳转到登录页，登录后怎么回到访问页
public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException {
HttpServletRequest req = (HttpServletRequest)request;
if(req.getSession().getAttribute("user")==null){
req.setAttribute("error", "请你先登录");
//非法请求才会进到这里面，在这里保存请求的url地址，在成功登录后再进行跳转
req.getSession().setAttribute("goUrl", req.getRequestURL()+"?"+ req.getQueryString());
request.getRequestDispatcher("/ulogin.jsp").forward(request, response);
}
else{
chain.doFilter(request, response);
}
}
上面的代码是过滤器中的代码
下面的是servlet中的代码
if(request.getSession().getAttribute("goUrl")!=null){
String url = (String)request.getSession().getAttribute("goUrl");
response.sendRedirect(url);
}
else{
response.sendRedirect("/webshopping/index.jsp");
}
C. javaweb如何实现用户在一个页面长时间不操作自动跳转到登录页面
设置Session超时时间,超时时长内,如果用户没有任何操作,Session就会自动过期.你在代码里先取Session,如果没有取到,就跳转到登录页面即可.
D. java实现注册成功自动登录
注册页面-->验证注册成功后跳到action，把存储数据库的那条数据取出来，放到session里，就已经成功登陆了，哪个页面需要用到用户信息，直接从session里取值