web登陸無(wú)非就是網(wǎng)頁(yè)獲取，cookie 的管理，post和get方式的模擬。
1.網(wǎng)頁(yè)內(nèi)容獲取
???? 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();
???? //模擬成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(); |
| String cookieVal = hc.getHeaderField("Set-Cookie"); |
| ??? sessionId = cookieVal.substring(0, cookieVal.indexOf(";")); |
}
| HttpURLConnection huc= (HttpURLConnection) url.openConnection(); |
| huc.setRequestProperty("Cookie", sessionId); |
| InputStream is = huc.getInputStream(); |
|
2.利用的jcookie包(http://jcookie.sourceforge.net/ )
獲取cookie:
| URL url = new URL("http://www.site.com/"); |
| HttpURLConnection huc = (HttpURLConnection) url.openConnection(); |
| InputStream is = huc.getInputStream(); |
| Client client = new Client(); |
| CookieJar cj = client.getCookies(huc); |
新的請(qǐng)求,利用上面獲取的cookie:
| url = new URL("http://www.site.com/"); |
| huc = (HttpURLConnection) url.openConnection(); |
| client.setCookies(huc, cj); |
3.post方式的模擬
URL url = new URL("www.xyz.com");
??HttpURLConnection huc = (HttpURLConnection) url.openConnection();
//設(shè)置允許output
??huc.setDoOutput(true);
//設(shè)置為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();
}
結(jié)束語(yǔ)：
?????上面的代碼基本就可以實(shí)現(xiàn)網(wǎng)站的登陸、信息獲取的功能?？吹降顷懫姹溶浖u(mài)的那么火，我們也做一個(gè)去吧
.
參考:
1.A recipe for cookie management
http://www.javaworld.com/javaworld/jw-04-2002/jw-0426-cookie.html
posted on 2006-03-21 21:47
rd2pm 閱讀(1335)
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