DownloadActivity.java
package com.duoguo.android;
import com.duoguo.util.DownloadUtil;
import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
/**
?* 文件下载
?*
?* @author shyboy([email protected])
?*
?*/
public class DownloadActivity extends Activity {
?// 声明Button控件
?private Button downloadTextFileButton;
?private Button downloadMP3FileButton;
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?public void onCreate(Bundle savedInstanceState) {
??super.onCreate(savedInstanceState);
??setContentView(R.layout.main);
??// 获取Button控件
??downloadTextFileButton = (Button) findViewById(R.id.downLoadTextFileId);
??downloadMP3FileButton = (Button) findViewById(R.id.downLoadMP3FileId);
??// 为Button控件添加事件单击监听器
??downloadTextFileButton
????.setOnClickListener(new DownloadTextFileClickListener());
??downloadMP3FileButton
????.setOnClickListener(new DownloadMP3FileClickListener());
?}
?// 为downloadTextFileButton控件编写监听器
?class DownloadTextFileClickListener implements OnClickListener {
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??public void onClick(View v) {
???String textContent = DownloadUtil
?????.download("http://dldx.csdn.net/fd.php?i=232723316503113&s=62d4f87fc08bc83113919d484d8a5dbb");// 下载文本内容
???System.out.println("歌词内容为：" + textContent);
??}
?}
?// 为downloadMP3FileButton控件编写监听器
?class DownloadMP3FileClickListener implements OnClickListener {
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??public void onClick(View v) {
???String mp3Content = DownloadUtil
?????.download(
???????"http://dldx.csdn.net/fd.php?i=232723316503113&s=62d4f87fc08bc83113919d484d8a5dbb",
???????"/MP3/", "view.ppt", false);
???System.out.println("MP3:" + mp3Content);
??}
?}
}
?
DownloadUtil.java
/**
?*
?*/
package com.duoguo.util;
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;
import android.util.Log;
/**
?* 文件下载帮助类
?*
?* @author shyboy([email protected])
?*
?*/
public class DownloadUtil {
?private static URL url;// 下载文件的地址
?/**
? * 下载文本文件
? *
? * @param urlStr
? *??????????? ：文件的下载链接地址
? * @return String：文本文件的内容
? */
?public static String download(String urlStr) {
??StringBuilder sb = new StringBuilder();
??String line = null;
??BufferedReader bufferedReader = null;
??try {
???url = new URL(urlStr);// 创建URL对象
???HttpURLConnection httpURLConnection = (HttpURLConnection) url
?????.openConnection();// 获取HttpURLConnection连接对象
???bufferedReader = new BufferedReader(new InputStreamReader(
?????httpURLConnection.getInputStream()));// 获取BufferedReader对象
???while ((line = bufferedReader.readLine()) != null) {
????sb.append(line);
???}
??} catch (MalformedURLException e) {
???e.printStackTrace();
???Log.d("debug", e.getMessage());
??} catch (IOException e) {
???e.printStackTrace();
???Log.d("debug", e.getMessage());
??} finally {
???try {
????bufferedReader.close();// 关闭流
???} catch (IOException e) {
????e.printStackTrace();
????Log.d("debug", e.getMessage());
???}
??}
??return sb.toString();
?}
?/**
? * 下载MP3文件
? *
? * @param urlStr
? *??????????? ：文件的下载链接地址
? * @param path
? *??????????? ：下载文件的存放路径
? * @param fileName
? *??????????? ：下载文件的名称
? * @param isReplace
? *??????????? ：是否替换已存在的文件
? * @return String：FAILURE/SUCCESS/EXIST
? */
?public static String download(String urlStr, String path, String fileName,
???boolean isReplace) {
??InputStream inputStream = null;
??File downloadFile = null;
??if (FileUtil.isFileExist(path + fileName))// 当文件存在时
??{
???if (isReplace)// 当替换文件时
???{
????inputStream = getInputStreamFromUrl(urlStr);// 根据URL获取相应的InputStream输入流对象
????downloadFile = FileUtil.writeToSDCardFromInput(path, fileName,
??????inputStream);// 通过输入流向SDCard中写入文件
????if (null == downloadFile) {
?????return DownloadEnum.FAILURE.toString();// 下载失败
????} else {
?????return DownloadEnum.SUCCESS.toString();// 下载成功
????}
???} else {
????return DownloadEnum.EXIST.toString();// 文件已存在
???}
??} else {
???inputStream = getInputStreamFromUrl(urlStr);// 根据URL获取相应的InputStream输入流对象
???downloadFile = FileUtil.writeToSDCardFromInput(path, fileName,
?????inputStream);// 通过输入流向SDCard中写入文件
???if (null == downloadFile) {
????return DownloadEnum.FAILURE.toString();// 下载失败
???} else {
????return DownloadEnum.SUCCESS.toString();// 下载成功
???}
??}
?}
?/**
? * 根据URL获取相应的InputStream输入流对象
? *
? * @param urlStr
? *??????????? ：文件的链接地址
? * @return InputStream
? */
?public static InputStream getInputStreamFromUrl(String urlStr) {
??InputStream inputStream = null;
??try {
???URL url = new URL(urlStr);
???HttpURLConnection httpURLConnection = (HttpURLConnection) url
?????.openConnection();
???inputStream = httpURLConnection.getInputStream();
??} catch (MalformedURLException e) {
???e.printStackTrace();
???Log.e("debug", e.getMessage());
??} catch (IOException e) {
???e.printStackTrace();
???Log.e("debug", e.getMessage());
??}
??return inputStream;
?}
}
FileUtil.java
/**
?*
?*/
package com.duoguo.util;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import android.os.Environment;
import android.util.Log;
/**
?* 文件操作类
?*
?* @author shyboy([email protected])
?*
?*/
public class FileUtil {
?private static String SDPATH = Environment.getExternalStorageDirectory()
???+ "/";// SDCard的目录名称
?public FileUtil() {
??SDPATH = Environment.getExternalStorageDirectory() + "/";// 获取当前外部存储设备的目录
??System.out.println("SDCard:" + SDPATH);
?}
?/**
? * 创建SDCard文件
? *
? * @param fileName
? *??????????? ：文件名称
? * @return File：文件对象
? */
?public static File createSDCardFile(String fileName) {
??File file = null;
??if ((null != SDPATH && !"".equals(SDPATH))
????&& (null != fileName && !"".equals(fileName))) {
???file = new File(SDPATH + fileName);// 生成文件对象
???if (null != file && !file.exists()) {
????try {
?????file.createNewFile();// 创建新文件
????} catch (IOException e) {
?????e.printStackTrace();
?????Log.d("debug", e.getMessage());
????}
???}
??}
??return file;
?}
?/**
? * 创建SDCard目录
? *
? * @param dirName
? *??????????? ：文件目录
? * @return File：文件对象
? */
?public static File createSDCardDir(String dirName) {
??File dir = null;
??dir = new File(SDPATH + dirName);// 生成文件目录对象
??if (null != dir && !dir.exists()) {
???dir.mkdirs();// 创建文件目录
??}
??return dir;
?}
?/**
? * 判断文件是否存在
? *
? * @param fileName
? *??????????? ：文件名称
? * @return boolean：true/false
? */
?public static boolean isFileExist(String fileName) {
??if ((null != SDPATH && !"".equals(SDPATH))
????&& (null != fileName && !"".equals(fileName))) {
???File file = new File(SDPATH + fileName);
???if (null != file) {
????if (file.exists()) {
?????return true;
????} else {
?????return false;
????}
???}
??}
??return false;
?}
?/**
? * 通过输入流向SDCard中写入文件
? *
? * @param path
? *??????????? ：文件存放在SDCard上的路径
? * @param fileName
? *??????????? ：文件名称
? * @param inputStream
? *??????????? ：输入流对象
? * @return File：文件对象
? */
?public static File writeToSDCardFromInput(String path, String fileName,
???InputStream inputStream) {
??File file = null;
??OutputStream outputStream = null;
??if (null != path && !"".equals(path)) {
???createSDCardDir(path);// 创建文件目录
???if (null != fileName && !"".equals(fileName)) {
????file = createSDCardFile(path + fileName);// 创建文件
????if (null != file) {
?????try {
??????outputStream = new FileOutputStream(file);// 创建OutputStream输出流对象
??????byte[] buffer = new byte[4 * 1024];
??????while ((inputStream.read(buffer)) != -1)// 将写入的内容写到字节数组中
??????{
???????try {
????????outputStream.write(buffer);// 将字节数组中读取的内容写入到输出流中
???????} catch (IOException e) {
????????e.printStackTrace();
???????}
??????}
??????outputStream.flush();// 清理输出流通道
?????} catch (FileNotFoundException e) {
??????e.printStackTrace();
??????Log.e("debug", e.getMessage());
?????} catch (IOException e) {
??????e.printStackTrace();
??????Log.e("debug", e.getMessage());
?????} finally {
??????try {
???????inputStream.close();// 关闭输入流（用来读取数据）
???????outputStream.close();// 关闭输出流（用来写入数据）
??????} catch (IOException e) {
???????e.printStackTrace();
???????Log.e("debug", e.getMessage());
??????}
?????}
????}
???}
??}
??return file;
?}
?/**
? * 获取SDCard的目录名称
? *
? * @return String
? */
?public String getSDPATH() {
??return SDPATH;
?}
?/**
? * 设置SDCard的目录名称
? *
? * @param sDPATH
? *??????????? ：SDCard的路径
? */
?public void setSDPATH(String sDPATH) {
??SDPATH = sDPATH;
?}
}
main.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
?android:orientation="vertical" android:layout_width="fill_parent"
?android:layout_height="fill_parent">
?<Button android:id="@+id/downLoadTextFileId"
??android:layout_width="fill_parent" android:layout_height="wrap_content"
??android:text="@string/downLoadTextFile" android:layout_margin="10px"
??android:layout_gravity="center" android:gravity="center" />
?<Button android:id="@+id/downLoadMP3FileId"
??android:layout_width="fill_parent" android:layout_height="wrap_content"
??android:text="@string/downLoadMP3File" android:layout_margin="10px"
??android:layout_gravity="center" android:gravity="center" />
</LinearLayout>
?
strings.xml
<?xml version="1.0" encoding="utf-8"?>
<resources>
?<string name="app_name">Download</string>
?<string name="downLoadTextFile">下载文本文件</string>
?<string name="downLoadMP3File">下载MP3文件</string>
</resources>
?
AndroidManifest.xml
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
?package="com.duoguo.android" android:versionCode="1"
?android:versionName="1.0">
?<uses-sdk android:minSdkVersion="8" />
?<application android:icon="@drawable/icon" android:label="@string/app_name">
??<activity android:name=".DownloadActivity" android:label="@string/app_name">
???<intent-filter>
????<action android:name="android.intent.action.MAIN" />
????<category android:name="android.intent.category.LAUNCHER" />
???</intent-filter>
??</activity>
?</application>
?<uses-permission android:name="android.permission.INTERNET" />
?<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
</manifest>
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