问FileInputStream如何在不替换html图标的情况下读取html文件

EN

String parts[] = request.split(" ");
        if(parts.length==3){
            if(parts[0].compareTo("GET")==0){
                String filename = parts[1].substring(1);
                System.out.println(filename);
                if(filename.compareTo("")==0){
                    FileInputStream defult = new FileInputStream("C:\\google.html");
                    byte byteArray[] = new byte[defult.available()];
                    while((b = defult.read(byteArray)) != -1){
                        //println(stream,"HTTP/1.1 200 OK");
                        //println(stream,"");
                        stream.write(byteArray);
                    }
                }
                else{
                    FileInputStream input = new FileInputStream("C:\\picture.jpg");
                    byte byteArray[] = new byte[input.available()];
                    while((b = input.read(byteArray)) != -1){
                        //println(stream,"HTTP/1.1 200 OK");
                        //println(stream,"");
                        sleep(1000);
                        stream.write(byteArray);
                        }
                 }