android 下载zip文件并解压

Posted 2022-11-28 IyangcLove

  公司项目有个需求， 需要下载一个html文件压缩包到本地 用WebView显示html页面。网上找到了下面链接 修改了一下就可以自己用：

   http://blog.csdn.net/hopehe888999/article/details/19035373 

   我将原方法中的很多东西进行了简化，看起来更简单明了一点。下面直接上代码：

    文件下载类

public class DownLoaderTask extends AsyncTask<Void, Integer, Long> 
	private final String TAG = "DownLoaderTask";
	private URL mUrl;
	private File mFile;
	private int mProgress = 0;
	private ProgressReportingOutputStream mOutputStream;
	private Context mContext;
	private String mTypeStr;
	// 文件下载的url 保存路径 out
      
         public DownLoaderTask(String url,String out,Context context,String typeStr)
		super();
		if(context!=null)
			mContext = context;
			mTypeStr=typeStr;
		
		try 
			mUrl = new URL(url);
			String fileName = new File(mUrl.getFile()).getName();
			mFile = new File(out, fileName);
			Log.d(TAG, "out="+out+", name="+fileName+",mUrl.getFile()="+mUrl.getFile());
		 catch (MalformedURLException e) 
			e.printStackTrace();
		
		
	
	
	@Override
	protected void onPreExecute() 
		// TODO Auto-generated method stub
	

	@Override
	protected Long doInBackground(Void... params) 
		// TODO Auto-generated method stub
		return download();
	

	@Override
	protected void onProgressUpdate(Integer... values) 
		// TODO Auto-generated method stub
	

	//下载保存后执行
	@Override
	protected void onPostExecute(Long result) 
		// TODO Auto-generated method stub
		if(isCancelled())
			return;
		//解压
		ZipExtractorTask task = new ZipExtractorTask(Constants.SAVE_FILES_PATH+mTypeStr,Constants.SAVE_FILES_PATH, mContext,true);
		task.execute();
	
	private long download()
		URLConnection connection = null;
		int bytesCopied = 0;
		try 
			connection = mUrl.openConnection();
			int length = connection.getContentLength();
			if(mFile.exists()&&length == mFile.length())
				Log.d(TAG, "file "+mFile.getName()+" already exits!!");
				return 0l;
			
			mOutputStream = new ProgressReportingOutputStream(mFile);
			publishProgress(0,length);
			bytesCopied =copy(connection.getInputStream(),mOutputStream);
			if(bytesCopied!=length&&length!=-1)
				Log.e(TAG, "Download incomplete bytesCopied="+bytesCopied+", length"+length);
			
			mOutputStream.close();
		 catch (IOException e) 
			// TODO Auto-generated catch block
			e.printStackTrace();
		
		return bytesCopied;
	
	private int copy(InputStream input, OutputStream output)
		byte[] buffer = new byte[1024*8];
		BufferedInputStream in = new BufferedInputStream(input, 1024*8);
		BufferedOutputStream out  = new BufferedOutputStream(output, 1024*8);
		int count =0,n=0;
		try 
			while((n=in.read(buffer, 0, 1024*8))!=-1)
				out.write(buffer, 0, n);
				count+=n;
			
			out.flush();
		 catch (IOException e) 
			// TODO Auto-generated catch block
			e.printStackTrace();
		finally
			try 
				out.close();
			 catch (IOException e) 
				// TODO Auto-generated catch block
				e.printStackTrace();
			
			try 
				in.close();
			 catch (IOException e) 
				// TODO Auto-generated catch block
				e.printStackTrace();
			
		
		return count;
	
	private final class ProgressReportingOutputStream extends FileOutputStream

		public ProgressReportingOutputStream(File file)
				throws FileNotFoundException 
			super(file);
			// TODO Auto-generated constructor stub
		

		@Override
		public void write(byte[] buffer, int byteOffset, int byteCount)
				throws IOException 
			// TODO Auto-generated method stub
			super.write(buffer, byteOffset, byteCount);
		    mProgress += byteCount;
		    publishProgress(mProgress);
		
		
	

文件解压类 对压缩文件进行解压（上面的类中 已执行解压方法）

/**
 *  解压
 */
public class ZipExtractorTask extends AsyncTask<Void, Integer, Long> 
	private final String TAG = "ZipExtractorTask";
	private final File mInput;
	private final File mOutput;
//	private final ProgressDialog mDialog;
	private int mProgress = 0;
	private final Context mContext;
	private boolean mReplaceAll;
	WebView mWebView;
       
        public ZipExtractorTask(String in, String out, Context context, boolean replaceAll)
		super();
		mInput = new File(in);
		mOutput = new File(out);
		if(!mOutput.exists())
			if(!mOutput.mkdirs())
				Log.e(TAG, "Failed to make directories:"+mOutput.getAbsolutePath());
			
		

		mContext = context;
		mReplaceAll = replaceAll;
	
	@Override
	protected Long doInBackground(Void... params) 
		// TODO Auto-generated method stub
		return unzip();
	
	
	@Override
	protected void onPostExecute(Long result) 
		// TODO Auto-generated method stub
		//super.onPostExecute(result);

		if(isCancelled())
			return;
		//这里表示解压完成  可以进行显示WebView 发送广播 并更新保存的 时间
		Intent intent = new Intent();
		intent.setAction("com.sl.unzip");
		mContext.sendBroadcast(intent);
	
	@Override
	protected void onPreExecute() 
		// TODO Auto-generated method stub
		//super.onPreExecute();
	
	@Override
	protected void onProgressUpdate(Integer... values) 
		// TODO Auto-generated method stub
	
	private long unzip()
		long extractedSize = 0L;
		Enumeration<ZipEntry> entries;
		ZipFile zip = null;
		try 
			zip = new ZipFile(mInput);
			long uncompressedSize = getOriginalSize(zip);
			publishProgress(0, (int) uncompressedSize);
			
			entries = (Enumeration<ZipEntry>) zip.entries();
			while(entries.hasMoreElements())
				ZipEntry entry = entries.nextElement();
				if(entry.isDirectory())
					continue;
				
				File destination = new File(mOutput, entry.getName());
				if(!destination.getParentFile().exists())
					Log.e(TAG, "make="+destination.getParentFile().getAbsolutePath());
					destination.getParentFile().mkdirs();
				
				if(destination.exists()&&mContext!=null&&!mReplaceAll)
					
				
				ProgressReportingOutputStream outStream = new ProgressReportingOutputStream(destination);
				extractedSize+=copy(zip.getInputStream(entry),outStream);
				outStream.close();
			
		 catch (ZipException e) 
			// TODO Auto-generated catch block
			e.printStackTrace();
		 catch (IOException e) 
			// TODO Auto-generated catch block
			e.printStackTrace();
		finally
			try 
				zip.close();
			 catch (IOException e) 
				// TODO Auto-generated catch block
				e.printStackTrace();
			
		

		return extractedSize;
	

	private long getOriginalSize(ZipFile file)
		Enumeration<ZipEntry> entries = (Enumeration<ZipEntry>) file.entries();
		long originalSize = 0l;
		while(entries.hasMoreElements())
			ZipEntry entry = entries.nextElement();
			if(entry.getSize()>=0)
				originalSize+=entry.getSize();
			
		
		return originalSize;
	
	
	private int copy(InputStream input, OutputStream output)
		byte[] buffer = new byte[1024*8];
		BufferedInputStream in = new BufferedInputStream(input, 1024*8);
		BufferedOutputStream out  = new BufferedOutputStream(output, 1024*8);
		int count =0,n=0;
		try 
			while((n=in.read(buffer, 0, 1024*8))!=-1)
				out.write(buffer, 0, n);
				count+=n;
			
			out.flush();
		 catch (IOException e) 
			// TODO Auto-generated catch block
			e.printStackTrace();
		finally
			try 
				out.close();
			 catch (IOException e) 
				// TODO Auto-generated catch block
				e.printStackTrace();
			
			try 
				in.close();
			 catch (IOException e) 
				// TODO Auto-generated catch block
				e.printStackTrace();
			
		
		return count;
	
	
	private final class ProgressReportingOutputStream extends FileOutputStream

		public ProgressReportingOutputStream(File file)
				throws FileNotFoundException 
			super(file);
			// TODO Auto-generated constructor stub
		
		@Override
		public void write(byte[] buffer, int byteOffset, int byteCount)
				throws IOException 
			// TODO Auto-generated method stub
			super.write(buffer, byteOffset, byteCount);
		    mProgress += byteCount;
		    publishProgress(mProgress);
		
		
	

   我写的这个是下载完成后自动解压到对应的路径。到时候可以根据情况进行修改。最后在子线程中调用执行：

 

DownLoaderTask downLoaderTask= new DownLoaderTask(Constants.WEB_HTTP_URLZIP+string, Constants.SAVE_FILES_PATH, getActivity(), "/"+zipName );
	    		downLoaderTask.execute();

下图为解压成功后的调用

vebView.loadUrl("file:///data/data/com.sl.washshop/wash_doc.html");//加载本地网页 "///"是系统默认的标识