package com.txsc.cache;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InvalidClassException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.io.Serializable;
import com.txsc.utils.NetUtils;
import android.content.Context;
public class CacheManager {
// wifi缓存时间为5分钟
private static long wifi_cache_time = 20 * 60 * 1000;
// 其他网络环境为20分钟
private static long other_cache_time = 20 * 60 * 1000;
/**
* 保存对象
*
* @param ser
* @param file
* @throws IOException
*/
public static boolean saveObject(Context context, Serializable ser,
String file) {
FileOutputStream fos = null;
ObjectOutputStream oos = null;
try {
fos = context.openFileOutput(file, Context.MODE_PRIVATE);
oos = new ObjectOutputStream(fos);
oos.writeObject(ser);
oos.flush();
return true;
} catch (Exception e) {
e.printStackTrace();
return false;
} finally {
try {
oos.close();
} catch (Exception e) {
}
try {
fos.close();
} catch (Exception e) {
}
}
}
/**
* 读取对象
*
* @param file
* @return
* @throws IOException
*/
public static Serializable readObject(Context context, String file) {
if (!isExistDataCache(context, file))
return null;
FileInputStream fis = null;
ObjectInputStream ois = null;
try {
fis = context.openFileInput(file);
ois = new ObjectInputStream(fis);
return (Serializable) ois.readObject();
} catch (FileNotFoundException e) {
} catch (Exception e) {
e.printStackTrace();
// 反序列化失败 - 删除缓存文件
if (e instanceof InvalidClassException) {
File data = context.getFileStreamPath(file);
data.delete();
}
} finally {
try {
ois.close();
} catch (Exception e) {
}
try {
fis.close();
} catch (Exception e) {
}
}
return null;
}
/**
* 判断缓存是否存在
*
* @param cachefile
* @return
*/
public static boolean isExistDataCache(Context context, String cachefile) {
if (context == null)
return false;
boolean exist = false;
File data = context.getFileStreamPath(cachefile);
if (data.exists())
exist = true;
return exist;
}
/**
* 判断缓存是否已经失效
*/
public static boolean isCacheDataFailure(Context context, String cachefile) {
File data = context.getFileStreamPath(cachefile);
if (!data.exists()) {
return false;
}
long existTime = System.currentTimeMillis() - data.lastModified();
boolean failure = false;
if (NetUtils.getNetworkType(context) == 1) {
failure = existTime > wifi_cache_time ? true : false;
} else {
failure = existTime > other_cache_time ? true : false;
}
return failure;
}
}