MP3播放器项目---编写代码---4

                                   MP3播放器项目---编写代码---4

1.代码结构图

 2.HttpDownload

package hui.download;

import hui.utils.FileUtils;

import java.io.BufferedReader;
import java.io.File;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;



public class HttpDownloader {
	private URL url = null;

	/**
	 * 根据URL下载文件，前提是这个文件当中的内容是文本，函数的返回值就是文件当中的内容
	 * 1.创建一个URL对象
	 * 2.通过URL对象，创建一个HttpURLConnection对象
	 * 3.得到InputStram
	 * 4.从InputStream当中读取数据
	 * @param urlStr
	 * @return
	 */
	public String download(String urlStr) {
		StringBuffer sb = new StringBuffer();
		String line = null;
		BufferedReader buffer = null;
		try {
			// 创建一个URL对象
			url = new URL(urlStr);
			// 创建一个Http连接
			HttpURLConnection urlConn = (HttpURLConnection) url
					.openConnection();
			// 使用IO流读取数据
			buffer = new BufferedReader(new InputStreamReader(urlConn
					.getInputStream()));
			while ((line = buffer.readLine()) != null) {
				sb.append(line);
			}
		} catch (Exception e) {
			e.printStackTrace();
		} finally {
			try {
				buffer.close();
			} catch (Exception e) {
				e.printStackTrace();
			}
		}
		return sb.toString();
	}

	/**
	 * 该函数返回整形 -1：代表下载文件出错 0：代表下载文件成功 1：代表文件已经存在
	 */
	public int downFile(String urlStr, String path, String fileName) {
		InputStream inputStream = null;
		try {
			FileUtils fileUtils = new FileUtils();
			if (fileUtils.isFileExist(fileName,path)) {
				return 1;
			} else {
				inputStream = getInputStreamFromUrl(urlStr);
				File resultFile = fileUtils.write2SDFromInput(path,fileName, inputStream);
				if (resultFile == null) {
					return -1;
				}
			}
		} catch (Exception e) {
			e.printStackTrace();
			return -1;
		} finally {
			try {
				inputStream.close();
			} catch (Exception e) {
				e.printStackTrace();
			}
		}
		return 0;
	}

	/**
	 * 根据URL得到输入流
	 * 
	 * @param urlStr
	 * @return
	 * @throws MalformedURLException
	 * @throws IOException
	 */
	public InputStream getInputStreamFromUrl(String urlStr)
			throws MalformedURLException, IOException {
		url = new URL(urlStr);
		HttpURLConnection urlConn = (HttpURLConnection) url.openConnection();
		InputStream inputStream = urlConn.getInputStream();
		return inputStream;
	}
}

 3.LrcProcessor

 

 

package hui.lrc;

import java.io.BufferedReader;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.util.ArrayList;
import java.util.LinkedList;
import java.util.Queue;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

public class LrcProcessor {

	public ArrayList<Queue> process(InputStream inputStream) {
		//存放时间点数据
		Queue<Long> timeMills = new LinkedList<Long>();
		//存放时间点所对应的歌词
		Queue<String> messages = new LinkedList<String>();
		ArrayList<Queue> queues = new ArrayList<Queue>();
		try {
			//创建BufferedReader对象
			InputStreamReader inputReader = new InputStreamReader(inputStream,"UTF-8");
			BufferedReader bufferedReader = new BufferedReader(inputReader);
			String temp = null;
			int i = 0;
			//创建一个正则表达式对象
			Pattern p = Pattern.compile("\\[([^\\]]+)\\]");
			String result = null;
			boolean b = true;
			while ((temp = bufferedReader.readLine()) != null) {
				i++;
				Matcher m = p.matcher(temp);
				if (m.find()) {
					if (result != null) {
						messages.add(result);
					}
					String timeStr = m.group();
					Long timeMill = time2Long(timeStr.substring(1, timeStr
							.length() - 1));
					if (b) {
						timeMills.offer(timeMill);
					}
					String msg = temp.substring(10);
					result = "" + msg + "\n";
				} else {
					result = result + temp + "\n";
				}
			}
			messages.add(result);
			queues.add(timeMills);
			queues.add(messages);
		} catch (Exception e) {
			e.printStackTrace();
		}
		return queues;
	}
	/**
	 * 将分钟，秒全部转换成毫秒
	 * @param timeStr
	 * @return
	 */
	public Long time2Long(String timeStr) {
		String s[] = timeStr.split(":");
		int min = Integer.parseInt(s[0]);
		String ss[] = s[1].split("\\.");
		int sec = Integer.parseInt(ss[0]);
		int mill = Integer.parseInt(ss[1]);
		return min * 60 * 1000 + sec * 1000 + mill * 10L;
	}

}

 

4. Mp3Info

package hui.model;

import java.io.Serializable;

public class Mp3Info implements Serializable{
	/**
	 * 
	 */
	private static final long serialVersionUID = 1L;
	private String id;
	private String mp3Name;
	private String mp3Size;

	public String getId() {
		return id;
	}

	public void setId(String id) {
		this.id = id;
	}

	public Mp3Info() {
		super();
	}

	@Override
	public String toString() {
		return "Mp3Info [id=" + id + ", lrcName=" + lrcName + ", lrcSize="
				+ lrcSize + ", mp3Name=" + mp3Name + ", mp3Size=" + mp3Size
				+ "]";
	}

	public String getMp3Name() {
		return mp3Name;
	}

	public Mp3Info(String id, String mp3Name, String mp3Size, String lrcName,
			String lrcSize) {
		super();
		this.id = id;
		this.mp3Name = mp3Name;
		this.mp3Size = mp3Size;
		this.lrcName = lrcName;
		this.lrcSize = lrcSize;
	}

	public void setMp3Name(String mp3Name) {
		this.mp3Name = mp3Name;
	}

	public String getMp3Size() {
		return mp3Size;
	}

	public void setMp3Size(String mp3Size) {
		this.mp3Size = mp3Size;
	}

	public String getLrcName() {
		return lrcName;
	}

	public void setLrcName(String lrcName) {
		this.lrcName = lrcName;
	}

	public String getLrcSize() {
		return lrcSize;
	}

	public void setLrcSize(String lrcSize) {
		this.lrcSize = lrcSize;
	}

	private String lrcName;
	private String lrcSize;

}

 5.FileUtils

package hui.utils;

import hui.model.Mp3Info;

import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.ArrayList;
import java.util.List;

import android.os.Environment;

public class FileUtils {
	private String SDCardRoot;

	public FileUtils() {
		// 得到当前外部存储设备的目录
		SDCardRoot = Environment.getExternalStorageDirectory()
				.getAbsolutePath()
				+ File.separator;
	}

	/**
	 * 在SD卡上创建文件
	 * 
	 * @throws IOException
	 */
	public File createFileInSDCard(String fileName, String dir)
			throws IOException {
		File file = new File(SDCardRoot + dir + File.separator + fileName);
		System.out.println("file---->" + file);
		file.createNewFile();
		return file;
	}

	/**
	 * 在SD卡上创建目录
	 * 
	 * @param dirName
	 */
	public File creatSDDir(String dir) {
		File dirFile = new File(SDCardRoot + dir + File.separator);
		System.out.println(dirFile.mkdirs());
		return dirFile;
	}

	/**
	 * 判断SD卡上的文件夹是否存在
	 */
	public boolean isFileExist(String fileName, String path) {
		File file = new File(SDCardRoot + path + File.separator + fileName);
		return file.exists();
	}

	/**
	 * 将一个InputStream里面的数据写入到SD卡中
	 */
	public File write2SDFromInput(String path, String fileName,
			InputStream input) {

		File file = null;
		OutputStream output = null;
		try {
			creatSDDir(path);
			file = createFileInSDCard(fileName, path);
			output = new FileOutputStream(file);
			byte buffer[] = new byte[4 * 1024];
			int temp;
			while ((temp = input.read(buffer)) != -1) {
				output.write(buffer, 0, temp);
			}
			output.flush();
		} catch (Exception e) {
			e.printStackTrace();
		} finally {
			try {
				output.close();
			} catch (Exception e) {
				e.printStackTrace();
			}
		}
		return file;
	}

	/**
	 * 读取目录中的Mp3文件的名字和大小
	 */
	public List<Mp3Info> getMp3Files(String path) {
		List<Mp3Info> mp3Infos = new ArrayList<Mp3Info>();
		File file = new File(SDCardRoot + File.separator + path);
		File[] files = file.listFiles();
		FileUtils fileUtils = new FileUtils();
		for (int i = 0; i < files.length; i++) {
			if (files[i].getName().endsWith("mp3")) {
				Mp3Info mp3Info = new Mp3Info();
				mp3Info.setMp3Name(files[i].getName());
				mp3Info.setMp3Size(files[i].length() + "");
				String temp [] = mp3Info.getMp3Name().split("\\.");
				String eLrcName = temp[0] + ".lrc";
				if(fileUtils.isFileExist(eLrcName, "/mp3")){
					mp3Info.setLrcName(eLrcName);
				}
				mp3Infos.add(mp3Info);
			}
		}
		return mp3Infos;
	}

}