本文提供了2段Android代码，实现了从Android客户端下载ZIP文件并且实现ZIP文件的解压功能，非常实用，有需要的Android开发者可以尝试一下。
下载：
DownLoaderTask.java
代码如下:
package com.johnny.testzipanddownload;
import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
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 java.net.MalformedURLException;
import java.net.URL;
import java.net.URLConnection;
import android.app.ProgressDialog;
import android.content.Context;
import android.content.DialogInterface;
import android.content.DialogInterface.OnCancelListener;
import android.os.AsyncTask;
import android.util.Log;
public class DownLoaderTask extends AsyncTask<Void, Integer, Long> {
private final String TAG = "DownLoaderTask";
private URL mUrl;
private File mFile;
private ProgressDialog mDialog;
private int mProgress = 0;
private ProgressReportingOutputStream mOutputStream;
private Context mContext;
public DownLoaderTask(String url,String out,Context context){
super();
if(context!=null){
mDialog = new ProgressDialog(context);
mContext = context;
}
else{
mDialog = null;
}
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) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
@Override
protected void onPreExecute() {
// TODO Auto-generated method stub
//super.onPreExecute();
if(mDialog!=null){
mDialog.setTitle("Downloading...");
mDialog.setMessage(mFile.getName());
mDialog.setProgressStyle(ProgressDialog.STYLE_HORIZONTAL);
mDialog.setOnCancelListener(new OnCancelListener() {
@Override
public void onCancel(DialogInterface dialog) {
// TODO Auto-generated method stub
cancel(true);
}
});
mDialog.show();
}
}
@Override
protected Long doInBackground(Void... params) {
// TODO Auto-generated method stub
return download();
}
@Override
protected void onProgressUpdate(Integer... values) {
// TODO Auto-generated method stub
//super.onProgressUpdate(values);
if(mDialog==null)
return;
if(values.length>1){
int contentLength = values[1];
if(contentLength==-1){
mDialog.setIndeterminate(true);
}
else{
mDialog.setMax(contentLength);
}
}
else{
mDialog.setProgress(values[0].intValue());
}
}
@Override
protected void onPostExecute(Long result) {
// TODO Auto-generated method stub
//super.onPostExecute(result);
if(mDialog!=null&&mDialog.isShowing()){
mDialog.dismiss();
}
if(isCancelled())
return;
((MainActivity)mContext).showUnzipDialog();
}
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);
}
}
}
解压：
ZipExtractorTask .java
代码如下:
package com.johnny.testzipanddownload;
import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
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 java.util.Enumeration;
import java.util.zip.ZipEntry;
import java.util.zip.ZipException;
import java.util.zip.ZipFile;
import android.app.ProgressDialog;
import android.content.Context;
import android.content.DialogInterface;
import android.content.DialogInterface.OnCancelListener;
import android.os.AsyncTask;
import android.util.Log;
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;
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());
}
}
if(context!=null){
mDialog = new ProgressDialog(context);
}
else{
mDialog = null;
}
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(mDialog!=null&&mDialog.isShowing()){
mDialog.dismiss();
}
if(isCancelled())
return;
}
@Override
protected void onPreExecute() {
// TODO Auto-generated method stub
//super.onPreExecute();
if(mDialog!=null){
mDialog.setTitle("Extracting");
mDialog.setMessage(mInput.getName());
mDialog.setProgressStyle(ProgressDialog.STYLE_HORIZONTAL);
mDialog.setOnCancelListener(new OnCancelListener() {
@Override
public void onCancel(DialogInterface dialog) {
// TODO Auto-generated method stub
cancel(true);
}
});
mDialog.show();
}
}
@Override
protected void onProgressUpdate(Integer... values) {
// TODO Auto-generated method stub
//super.onProgressUpdate(values);
if(mDialog==null)
return;
if(values.length>1){
int max=values[1];
mDialog.setMax(max);
}
else
mDialog.setProgress(values[0].intValue());
}
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);
}
}
}
Main Activity
MainActivity.java
代码如下:
package com.johnny.testzipanddownload;
import android.os.Bundle;
import android.os.Environment;
import android.app.Activity;
import android.app.AlertDialog;
import android.content.DialogInterface;
import android.content.DialogInterface.OnClickListener;
import android.util.Log;
import android.view.Menu;
public class MainActivity extends Activity {
private final String TAG="MainActivity";
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Log.d(TAG, "Environment.getExternalStorageDirectory()="+Environment.getExternalStorageDirectory());
Log.d(TAG, "getCacheDir().getAbsolutePath()="+getCacheDir().getAbsolutePath());
showDownLoadDialog();
//doZipExtractorWork();
//doDownLoadWork();
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
private void showDownLoadDialog(){
new AlertDialog.Builder(this).setTitle("确认")
.setMessage("是否下载？")
.setPositiveButton("是", new OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
// TODO Auto-generated method stub
Log.d(TAG, "onClick 1 = "+which);
doDownLoadWork();
}
})
.setNegativeButton("否", new OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
// TODO Auto-generated method stub
Log.d(TAG, "onClick 2 = "+which);
}
})
.show();
}
public void showUnzipDialog(){
new AlertDialog.Builder(this).setTitle("确认")
.setMessage("是否解压？")
.setPositiveButton("是", new OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
// TODO Auto-generated method stub
Log.d(TAG, "onClick 1 = "+which);
doZipExtractorWork();
}
})
.setNegativeButton("否", new OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
// TODO Auto-generated method stub
Log.d(TAG, "onClick 2 = "+which);
}
})
.show();
}
public void doZipExtractorWork(){
//ZipExtractorTask task = new ZipExtractorTask("/storage/usb3/system.zip", "/storage/emulated/legacy/", this, true);
ZipExtractorTask task = new ZipExtractorTask("/storage/emulated/legacy/testzip.zip", "/storage/emulated/legacy/", this, true);
task.execute();
}
private void doDownLoadWork(){
DownLoaderTask task = new DownLoaderTask("http://192.168.9.155/johnny/testzip.zip", "/storage/emulated/legacy/", this);
//DownLoaderTask task = new DownLoaderTask("http://192.168.9.155/johnny/test.h264", getCacheDir().getAbsolutePath()+"/", this);
task.execute();
}
}
以上就是Android实现zip文件下载和解压功能，希望对你有所帮助。
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