videotype.java

《精通JAVA手机游戏与应用程序设计》随书光盘

package controlVideo;


public class VideoType {
	public VideoType(){
	
	}

	public  String guessContentType(String url) throws Exception {
    	// guess content type
    	String[] sURL = splitURL(url);
    	String ext = "";
    	String ct = "";
    	int lastDot = sURL[4].lastIndexOf('.');
    	if (lastDot>=0) {
    	    ext = sURL[4].substring(lastDot+1).toLowerCase();
    	}
    	if (ext.equals("mpg") || url.equals("avi")) {
    	    ct = "video/mpeg";
    	} else if (ext.equals("mid") || ext.equals("kar")) {
    	    ct = "audio/midi";
    	} else if (ext.equals("wav")) {
    	    ct = "audio/x-wav";
    	} else if (ext.equals("jts")) {
    	    ct = "audio/x-tone-seq";
    	} else if (ext.equals("txt")) {
    	    ct = "audio/x-txt";
    	} else if (ext.equals("amr")) {
    	    ct = "audio/amr";
    	} else if (ext.equals("awb")) {
    	    ct = "audio/amr-wb";
    	} else if (ext.equals("gif")) {
    	    ct = "image/gif";
    	}
    	return ct;
        }
    public  String[] splitURL(String url) throws Exception {
    	StringBuffer u=new StringBuffer(url);
    	String[] result=new String[6];
    	for (int i=0; i<=5; i++) {
    	    result[i]="";
    	}
    	// get protocol
    	boolean protFound=false;
    	int index=url.indexOf(":");
    	if (index>0) {
    	    result[0]=url.substring(0, index);
    	    u.delete(0, index+1);
    	    protFound=true;
    	}
    	else if (index==0) {
    	    throw new Exception("url format error - protocol");
    	}
    	// check for host/port
    	if (u.length()>2 && u.charAt(0)=='/' && u.charAt(1)=='/') {
    	    // found domain part
    	    u.delete(0, 2);
    	    int slash=u.toString().indexOf('/');
    	    if (slash<0) {
    		slash=u.length();
    	    }
    	    int colon=u.toString().indexOf(':');
    	    int endIndex=slash;
    	    if (colon>=0) {
    		if (colon>slash) {
    		    throw new Exception("url format error - port");
    		}
    		endIndex=colon;
    		result[2]=u.toString().substring(colon+1, slash);
    	    }
    	    result[1]=u.toString().substring(0, endIndex);
    	    u.delete(0, slash);
    	}
    	// get filename
    	if (u.length()>0) {
    	    url=u.toString();
    	    int slash=url.lastIndexOf('/');
    	    if (slash>0) {
    		result[3]=url.substring(0, slash);
    	    }
    	    if (slash<url.length()-1) {
    		String fn = url.substring(slash+1, url.length());
    		int anchorIndex = fn.indexOf("#");
    		if (anchorIndex>=0) {
    		    result[4] = fn.substring(0, anchorIndex);
    		    result[5] = fn.substring(anchorIndex+1);
    		} else {
    		    result[4] = fn;
    		}
    	    }
    	}
    	return result;
        }
}