背景

当应用数据很多时就需要进行备份了，不然当应用一被卸载，所有数据都将会丢失，那将是很麻烦的一件事，而备份，可以备份在本地或云端两种方式，本地仍会有被不小心删除的风险，而且不同设备之间数据同步也是很麻烦，而云端就需要架设一个稳定运行的服务器才行，这显然将是一笔不小的开支，那有没有兼顾两者优点的方案呢，WebDav就应运而生了。

环境

AndroidStudio3.+

具体步骤

引用开源库sardine-android依赖

dependencies {//需要替换okhttp3版本，以去除kotlin库，当然若是需要kotlin就不用替换了implementation('com.thegrizzlylabs.sardine-android:sardine-android:0.5'){exclude group: 'com.squareup.okhttp3'}implementation 'com.squareup.okhttp3:okhttp:3.8.0'//需要排除xpp3，不然编译有问题，当然若是没问题就不用排除了configurations {all {exclude group: 'xpp3', module: 'xpp3'}}
}

封装类

import com.thegrizzlylabs.sardineandroid.Sardine;
import com.thegrizzlylabs.sardineandroid.impl.OkHttpSardine;import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;//本例仅实现了备份shared_prefs目录的数据
public class BackupManager {public static final String TAG = "BackupManager";public static final String DIALOG_BETA_BACKUP_DIR = "cloud_backup_dir/";public static final String DEF_SERVER= "https://dav.jianguoyun.com/dav/";//备份到坚果云webDevpublic static boolean backupToWebDav(String server, String userName, String password) {//init webDevSardine sardine = new OkHttpSardine();sardine.setCredentials(userName, password);//zip dataFile outFile = new File(App.context.getCacheDir(), "backup.zip");if (outFile.exists()) outFile.delete();File inFiles[] = new File(App.context.getCacheDir().getParentFile(), "shared_prefs").listFiles();if (inFiles == null || inFiles.length <= 0) return false;boolean result = ZipUtil.zipFiles(inFiles, outFile);if (!result) return false;if (!outFile.exists() || !outFile.canRead() || outFile.length() <= 0) return false;//upload datatry {if (!sardine.exists(server+DIALOG_BETA_BACKUP_DIR)) {sardine.createDirectory(server+DIALOG_BETA_BACKUP_DIR);}sardine.put(server+DIALOG_BETA_BACKUP_DIR+ "backup.zip", outFile, "*/*");outFile.delete();Debug.LogI(TAG, "backup success");return true;} catch (IOException e) {e.printStackTrace();Debug.LogE(TAG, "backup failed");}return false;}//从坚果云恢复备份public static boolean restoreFromWebDav(String server, String userName, String password) {//init webDevSardine sardine = new OkHttpSardine();sardine.setCredentials(userName, password);//download backup dataFile outFile = new File(App.context.getCacheDir(), "backup.zip");if (outFile.exists()) outFile.delete();try {outFile.createNewFile();} catch (IOException e) {e.printStackTrace();}try {if (!sardine.exists(server+DIALOG_BETA_BACKUP_DIR)) return false;InputStream inputStream = sardine.get(server +DIALOG_BETA_BACKUP_DIR+ "backup.zip");OutputStream outputStream = new FileOutputStream(outFile);byte[] buf = new byte[1024];int n = 0;while ((n = inputStream.read(buf)) > 0) {outputStream.write(buf, 0, n);outputStream.flush();}outputStream.close();inputStream.close();File in=outFile;File outDir = new File(App.context.getCacheDir().getParentFile(), "shared_prefs");ZipUtil.upZipFile(in,outDir.getPath());Debug.LogI(TAG, "restore success");return true;} catch (IOException e) {e.printStackTrace();Debug.LogE(TAG, "restore failed");return false;}}
}

调用

 boolean isSuccess = BackupManager.restoreFromWebDav(mServer, mUsername, mPassword);

boolean isSuccess = BackupManager.backupToWebDav(mServer, mUsername, mPassword);

Android开发之WebDav

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