HttpConnectionHelper.java

HTTP连接处理与重定向

最新推荐文章于 2022-10-06 23:23:25 发布

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本文介绍了一个Java类，用于处理HTTP连接并实现自动重定向功能。通过使用javax.microedition.io包中的HttpConnection，该类可以打开指定URL的连接，并根据HTTP响应状态进行重定向处理。同时支持传入回调接口以便于进一步定制请求。

import java.io.*;
import javax.microedition.io.*;

public class HttpConnectionHelper {

public interface Callback {
void prepareRequest( String originalURL,
HttpConnection conn )
throws IOException;
}

public static HttpConnection connect( String url )
throws IOException {
return connect( url, null );
}

public static HttpConnection connect(
String url, Callback callback )
throws IOException {
HttpConnection conn = null;
String originalURL = url;

while( url != null ){
conn = (HttpConnection)
Connector.open( url );

if( callback != null ){
callback.prepareRequest( originalURL,
conn );
}

int rc = conn.getResponseCode();

switch( rc ){
case HttpConnection.HTTP_MOVED_PERM:
case HttpConnection.HTTP_MOVED_TEMP:
case HttpConnection.HTTP_SEE_OTHER:
case HttpConnection.HTTP_TEMP_REDIRECT:
url = conn.getHeaderField( "Location" );
if( url != null && url.startsWith(
"/*" ) ){
StringBuffer b = new StringBuffer();
b.append( "http://" );
b.append( conn.getHost() );
b.append( ':' );
b.append( conn.getPort() );
b.append( url );
url = b.toString();
}
conn.close();
break;
default:
url = null;
break;
}
}

return conn;
}
}