java httpurlconnection 发送cookie时,cookie要在Post前发送

最新推荐文章于 2021-07-04 10:45:31 发布

周三山

最新推荐文章于 2021-07-04 10:45:31 发布

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分类专栏： 3.JAVA 文章标签： java null

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本文介绍了一段Java代码，该代码通过建立HTTP连接来获取指定URL的内容流，并支持POST请求及Cookie传递。首先从特定URL抓取Cookie，然后使用这些Cookie发起另一HTTP请求。

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Java代码

public InputStream getStream(URL url,String post,URL cookieurl){
HttpURLConnection connection;
String cookieVal = null ;
String sessionId = "" ;
String key=null ;
if (cookieurl!= null ){
try {
connection = (HttpURLConnection)cookieurl.openConnection();
for ( int i = 1 ; (key = connection.getHeaderFieldKey(i)) != null ; i++ ) {
if (key.equalsIgnoreCase( "set-cookie" )) {
cookieVal = connection.getHeaderField(i);
cookieVal = cookieVal.substring(0 , cookieVal.indexOf( ";" ));
sessionId = sessionId+cookieVal+";" ;
}
}
InputStream in = connection.getInputStream();
System.out.println(sessionId);
}catch (MalformedURLException e){
System.out.println("url can't connection" );
return null ;
}catch (IOException e){
System.out.println(e.getMessage());
return null ;
}
}
try {
connection = (HttpURLConnection)url.openConnection();
//这个要写在Post前,否则会取不到值,原因我不知道
if (cookieurl!= null ){
connection.setRequestProperty("Cookie" , sessionId);
}
if (post!= "" ){
connection.setDoOutput(true );
connection.setRequestMethod("POST" );
connection.getOutputStream().write(post.getBytes());
connection.getOutputStream().flush();
connection.getOutputStream().close();
}
int responseCode = connection.getResponseCode();
int contentLength = connection.getContentLength();
// System.out.println("Content length: "+contentLength);
if (responseCode != HttpURLConnection.HTTP_OK ) return ( null );
InputStream in = connection.getInputStream();
return (in);
}
catch (Exception e) {
// System.out.println(e);
// e.printStackTrace();
return ( null );
}
}

转自：http://stephenjqj.javaeye.com/blog/477194