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;
}
}