taskmodel.java

是一个java写的 可以输入要下的歌名

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package mymp3.downloader;

/**
 *
 * @author huliqing
 */
public class TaskModel {
    public static final int COLUMN_STATE = 0;
    public static final int COLUMN_NAME = 1;
    public static final int COLUMN_SIZE = 2;
    public static final int COLUMN_PROCESS = 3;
    public static final int COLUMN_LOADED = 4;
    public static final int COLUMN_SPEED = 5;
    public static final int COLUMN_LEAVE_TIME = 6;
    
    public static final String[] COLUMN_HEAD = {
        "", "文件名", "大小", "进度", "已下载", "速度", "剩余时间"
    };
    
    public static final int TOTAL_COLUMNS = 7;
    
    private String state;
    private String name;    // 文件名称
    private int size;       // 大小
    //private int process;    // 进度
    //private long loaded;     // 已经下载数
    //private long speed;      // 速度
    //private long leaveTime;  // 剩余时间
    private String url;     // 文件地址
    
    public TaskModel(String name, String url) {
        this.name = name;
        this.url = url;
        this.downloader = new Downloader(this); // 添加下载任务
    }
    
    public Object getColumnValue(int column) {
        switch (column) {
            case COLUMN_STATE:  // 反回状态
                if (downloader.isStopped()) {
                    state = "Stop";
                } else if (downloader.isPaused()) {
                    state = "Pause";
                } else {
                    state = "Run";
                }
                return state;
            case COLUMN_NAME:   // 返回文件名
                return name;
            case COLUMN_SIZE:   // 返回文件大小
                size = downloader.getTotalBytes();
                if (size >= (1024 * 1024)) {
                    return (size / 1024 / 1024) + " M";
                } else if (size >= 1024) {
                    return (size / 1024) + " K";
                } else if (size <= 0) {
                    return "";
                } else {
                    return size + " B";
                }
            case COLUMN_PROCESS:    // 返回下载进度
                if (size <= 0) return 0;
                return (downloader.getReadBytes() * 100 / size);
            case COLUMN_LOADED: // 返回已下载数
                long loaded = downloader.getReadBytes();
                if (loaded >= (1024 * 1024)) {
                    return (loaded / 1024 / 1024) + " M";
                } else if (loaded >= 1024) {
                    return (loaded / 1024) + " K";
                }
                return loaded;
            case COLUMN_SPEED:  // 返回下载速度
                long speed = downloader.getSpeed();
                return speed >= 0 ? (speed + " k/s") : "0 k/s";
            case COLUMN_LEAVE_TIME: // 返回剩余时间
                return downloader.getLeaveTime();
            default:
                return null;
        }
    }
    
    public String getName() {
        return name;
    }
    
    public String getUrl() {
        return url;
    }
    /** 判断任务是否已经完成 */
    public boolean isOk() {
        return downloader.isOk();
    }
    
    // -------------------------------------------------- 下载任务
    private Downloader downloader;
    /** 开始任务 */
    public void toStart() {
        downloader.toStart();
    }
    /** 暂停任务 */
    public void toPause() {
        downloader.toPause();
    }
    /** 停止任务 */
    public void toStop() {
        downloader.stopDownload();
    }
}