java实现web登录_JAVA实现web登录

1.网页内容获取java.io.InputStream in;

java.net.URL url = new java.net.URL(www.xyz.com/content.html);

java.net.HttpURLConnection connection = (java.net.HttpURLConnection)

url.openConnection();

connection = (java.net.HttpURLConnection) url.openConnection();

//模拟成IE

connection.setRequestProperty("User-Agent","Mozilla/4.0 (compatible; MSIE 6.0; Windows 2000)");

connection.connect();

in = connection.getInputStream();

java.io.BufferedReader breader =

new BufferedReader(new InputStreamReader(in , "GBK"));

String str=breader.readLine());

while(st != null){

System.out.println(str);

str=breader.readLine());

}

2.cookie管理

1.直接的方式取得cookie：HttpURLConnection huc= (HttpURLConnection) url.openConnection();

InputStream is = huc.getInputStream();

//取得sessionID.

String cookieVal = hc.getHeaderField("Set-Cookie");

String sessionId;

if(cookieVal != null)

{

sessionId = cookieVal.substring(0, cookieVal.indexOf(";"));

}

发送设置cookie：HttpURLConnection huc= (HttpURLConnection) url.openConnection();

if(sessionId != null)

{

huc.setRequestProperty("Cookie", sessionId);

}

InputStream is = huc.getInputStream();

2.利用的jcookie包获取cookie:

URL url = new URL("http://www.site.com/");

HttpURLConnection huc = (HttpURLConnection) url.openConnection();

huc.connect();

InputStream is = huc.getInputStream();

Client client = new Client();

CookieJar cj = client.getCookies(huc);

新的请求,利用上面获取的cookie:

url = new URL("http://www.site.com/");

huc = (HttpURLConnection) url.openConnection();

client.setCookies(huc, cj);

3.post方式的模拟URL url = new URL("www.xyz.com");

HttpURLConnection huc = (HttpURLConnection) url.openConnection();

//设置允许output

huc.setDoOutput(true);

//设置为post方式huc.setRequestMethod("POST");

huc.setRequestProperty("User-Agent","Mozilla/4.7 [en] (Win98; I)");

StringBuffer sb = new StringBuffer();

sb.append("userName="+userNme);

sb.append("&password="+password);

//post信息OutputStream os = huc.getOutputStream();

os.write(sb.toString().getBytes("GBK"));

os.close();

BufferedReader br = new BufferedReader(new InputStreamReader(huc.getInputStream()))

huc.connect();

String line = br.readLine();

while(line != null){

l

System.out.printli(line);

line = br.readLine();

}