<span style="font-size:18px;">package com.zhimore.cache;
import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.FileOutputStream;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.io.RandomAccessFile;
import java.io.Serializable;
import java.util.Collections;
import java.util.HashMap;
import java.util.Map;
import java.util.Set;
import java.util.Map.Entry;
import java.util.concurrent.atomic.AtomicInteger;
import java.util.concurrent.atomic.AtomicLong;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
import com.zhimore.cache.utils.Utils;
import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.drawable.Drawable;
import android.text.TextUtils;
import android.util.Log;
public class CacheUtils {
private static final int MAX_SIZE = 1000 * 1000 * 10; // 10 mb
private static final int MAX_COUNT = Integer.MAX_VALUE; // 不限制存放数据的数量
private static final String TAG = CacheUtils.class.getSimpleName();
private static String cacheName = CacheUtils.class.getSimpleName();
private static Map<String, CacheUtils> mInstanceMap = new HashMap<String, CacheUtils>();
private CacheManager mCache;
/**
* @param cacheDir
* @param maxSize
* @param maxCount
*/
public CacheUtils(File cacheDir, long maxSize, int maxCount) {
if(!cacheDir.exists()&&!cacheDir.mkdirs()){
throw new RuntimeException("can't make dirs in " + cacheDir.getAbsolutePath());
}
mCache = new CacheManager(cacheDir, maxSize, maxCount);
}
/**
*
* @param context 上下文
* @return CacheUtils
*/
public static CacheUtils get(Context context){
return get(context,cacheName);
}
/**
* @param context 上下文
* @param cacheName 文件名
* @return
*/
private static CacheUtils get(Context context, String cacheName) {
File file = new File(context.getCacheDir(), cacheName);
return get(file,MAX_SIZE,MAX_COUNT);
}
/**
* @param file 要保存的文件
* @param maxSize
* @param maxCount
* @return 根据文件名返回CacheUtils对象,如果文件名不同 它设置的文件大小 以及文件个数就不同
*/
private static CacheUtils get(File cacheDir, long maxSize, int maxCount) {
CacheUtils manager = mInstanceMap.get(cacheDir.getAbsoluteFile() + myPid());
if (manager == null) {
manager = new CacheUtils(cacheDir, maxSize, maxCount);
mInstanceMap.put(cacheDir.getAbsolutePath() + myPid(), manager);
}
return manager;
}
private static String myPid() {
return "_" + android.os.Process.myPid();
}
/**
* 保存string数据到缓存中
*/
public void put(String key, String value) {
File file = mCache.newFile(key);
BufferedWriter out = null;
try {
out = new BufferedWriter(new FileWriter(file), 1024);
out.write(value);
} catch (IOException e) {
e.printStackTrace();
} finally {
if (out != null) {
try {
out.flush();
out.close();
} catch (IOException e) {
e.printStackTrace();
}
}
mCache.put(file);
}
}
/**
* 读取 String数据
*/
public String getAsString(String key) {
File file = mCache.get(key);
if (!file.exists())
return null;
boolean removeFile = false;
BufferedReader in = null;
try {
in = new BufferedReader(new FileReader(file));
String readString = "";
String currentLine;
while ((currentLine = in.readLine()) != null) {
readString += currentLine;
}
if (!Utils.isDue(readString)) {
return Utils.clearDateInfo(readString);
} else {
removeFile = true;
return null;
}
} catch (IOException e) {
e.printStackTrace();
return null;
} finally {
if (in != null) {
try {
in.close();
} catch (IOException e) {
e.printStackTrace();
}
}
if (removeFile)
remove(key);
}
}
/**
* 读取Object对象
* @param key
* @return
*/
public Object getAsObject(String key){
byte[] data = getAsBinary(key);
if (data != null) {
ByteArrayInputStream bais = null;
ObjectInputStream ois = null;
try {
bais = new ByteArrayInputStream(data);
ois = new ObjectInputStream(bais);
Object reObject = ois.readObject();
return reObject;
} catch (Exception e) {
e.printStackTrace();
return null;
} finally {
try {
if (bais != null)
bais.close();
} catch (IOException e) {
e.printStackTrace();
}
try {
if (ois != null)
ois.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
return null;
}
/**
* 获取缓存的json object
* @return
*/
public JSONObject getAsJSONObject(String key){
JSONObject jsonObject = null;
if(!TextUtils.isEmpty(key)){
String json = getAsString(key);
try {
jsonObject = new JSONObject(json);
} catch (JSONException e) {
e.printStackTrace();
}
}
return jsonObject;
}
/**
* 移除某个key
*/
public boolean remove(String key) {
return mCache.remove(key);
}
/**
* 缓存管理器
*/
class CacheManager{
protected File cacheDir;
private final AtomicLong cacheSize;
private final AtomicInteger cacheCount;
private final long sizeLimit;
private final int countLimit;
private final Map<File, Long> lastUsageDates = Collections.synchronizedMap(new HashMap<File, Long>());
private CacheManager(File cacheDir, long sizeLimit, int countLimit) {
this.cacheDir = cacheDir;
this.sizeLimit = sizeLimit;
this.countLimit = countLimit;
cacheSize = new AtomicLong();
cacheCount = new AtomicInteger();
calculateCacheSizeAndCacheCount();
}
/**
* @param key
* @return
*/
public File newFile(String key) {
return new File(cacheDir, key.hashCode() + "");
}
/**
* 保存 String数据 到 缓存中
*/
public void put(String key, String value, int saveTime) {
put(key, Utils.newStringWithDateInfo(saveTime, value));
}
/**
* 保存 String数据 到 缓存中
*/
public void put(String key, String value) {
File file = mCache.newFile(key);
BufferedWriter out = null;
try {
out = new BufferedWriter(new FileWriter(file), 1024);
out.write(value);
} catch (IOException e) {
e.printStackTrace();
} finally {
if (out != null) {
try {
out.flush();
out.close();
} catch (IOException e) {
e.printStackTrace();
}
}
mCache.put(file);
}
}
/**
* 保存 byte数据 到 缓存中
*/
public void put(String key, byte[] value, int saveTime) {
put(key, Utils.newByteArrayWithDateInfo(saveTime, value));
}
/**
* 保存 byte数据 到 缓存中
*/
public void put(String key, byte[] value) {
File file = mCache.newFile(key);
FileOutputStream out = null;
try {
out = new FileOutputStream(file);
out.write(value);
} catch (Exception e) {
e.printStackTrace();
} finally {
if (out != null) {
try {
out.flush();
out.close();
} catch (IOException e) {
e.printStackTrace();
}
}
mCache.put(file);
}
}
/**
* 把file
* @param file
*/
private void put(File file) {
int curCacheCount = cacheCount.get();
while (curCacheCount + 1 > countLimit) {
long freedSize = removeNext();
cacheSize.addAndGet(-freedSize);
curCacheCount = cacheCount.addAndGet(-1);
}
cacheCount.addAndGet(1);
long valueSize = calculateSize(file);
long curCacheSize = cacheSize.get();
while (curCacheSize + valueSize > sizeLimit) {
long freedSize = removeNext();
curCacheSize = cacheSize.addAndGet(-freedSize);
}
cacheSize.addAndGet(valueSize);
Long currentTime = System.currentTimeMillis();
file.setLastModified(currentTime);
lastUsageDates.put(file, currentTime);
}
/**
* 计算 cacheSize和cacheCount
*/
private void calculateCacheSizeAndCacheCount() {
new Thread(new Runnable() {
@Override
public void run() {
int size = 0;
int count = 0;
File[] cachedFiles = cacheDir.listFiles();
if (cachedFiles != null) {
for (File cachedFile : cachedFiles) {
size += calculateSize(cachedFile);
count += 1;
lastUsageDates.put(cachedFile, cachedFile.lastModified());
}
cacheSize.set(size);
cacheCount.set(count);
}
}
}).start();
}
/**
* 移除旧的文件
*
* @return
*/
private long removeNext() {
if (lastUsageDates.isEmpty()) {
return 0;
}
Long oldestUsage = null;
File mostLongUsedFile = null;
Set<Entry<File, Long>> entries = lastUsageDates.entrySet();
synchronized (lastUsageDates) {
for (Entry<File, Long> entry : entries) {
if (mostLongUsedFile == null) {
mostLongUsedFile = entry.getKey();
oldestUsage = entry.getValue();
} else {
Long lastValueUsage = entry.getValue();
if (lastValueUsage < oldestUsage) {
oldestUsage = lastValueUsage;
mostLongUsedFile = entry.getKey();
}
}
}
}
long fileSize = calculateSize(mostLongUsedFile);
if (mostLongUsedFile.delete()) {
lastUsageDates.remove(mostLongUsedFile);
}
return fileSize;
}
/**
* 根据key删除文件
* @param key
* @return
*/
private boolean remove(String key) {
File image = get(key);
return image.delete();
}
/**
* 根据key获取文件
* @param key
* @return
*/
private File get(String key) {
File file = newFile(key);
Long currentTime = System.currentTimeMillis();
file.setLastModified(currentTime);
lastUsageDates.put(file, currentTime);
return file;
}
private long calculateSize(File file) {
return file.length();
}
}
/**
* @param key
* @param jsonObject json object对象
*/
public void put(String key, JSONObject jsonObject) {
if(jsonObject!=null){
put(key, jsonObject.toString());
}
}
/**
* @param key
* @param jsonArray 字符串数组
*/
public void put(String key, JSONArray jsonArray) {
if(jsonArray!=null){
put(key, jsonArray.toString());
}
}
/**
* 保存 byte数据 到 缓存中
*/
public void put(String key, byte[] value) {
File file = mCache.newFile(key);
FileOutputStream out = null;
try {
out = new FileOutputStream(file);
out.write(value);
} catch (Exception e) {
e.printStackTrace();
} finally {
if (out != null) {
try {
out.flush();
out.close();
} catch (IOException e) {
e.printStackTrace();
}
}
mCache.put(file);
}
}
/**
* 缓存图片
* @param name
* @param bitmap
*/
public void put(String key, Bitmap bitmap) {
put(key, Utils.Bitmap2Bytes(bitmap));
}
public Bitmap getAsBitmap(String key){
if (getAsBinary(key) == null) {
return null;
}
return Utils.Bytes2Bimap(getAsBinary(key));
}
/**
* 获取 byte 数据
*/
public byte[] getAsBinary(String key) {
RandomAccessFile RAFile = null;
boolean removeFile = false;
try {
File file = mCache.get(key);
if (!file.exists())
return null;
RAFile = new RandomAccessFile(file, "r");
byte[] byteArray = new byte[(int) RAFile.length()];
RAFile.read(byteArray);
if (!Utils.isDue(byteArray)) {
return Utils.clearDateInfo(byteArray);
} else {
removeFile = true;
return null;
}
} catch (Exception e) {
e.printStackTrace();
return null;
} finally {
if (RAFile != null) {
try {
RAFile.close();
} catch (IOException e) {
e.printStackTrace();
}
}
if (removeFile)
remove(key);
}
}
/**
* @param key
* @param person
*/
public void put(String key, Serializable value) {
if(value!=null){
put(key, value, -1);
}
}
/**
* 保存 Serializable数据到 缓存中 前提这个对象要序列化
*/
public void put(String key, Serializable value, int saveTime) {
ByteArrayOutputStream baos = null;
ObjectOutputStream oos = null;
try {
baos = new ByteArrayOutputStream();
oos = new ObjectOutputStream(baos);
oos.writeObject(value);
byte[] data = baos.toByteArray();
if (saveTime != -1) {
put(key, data, saveTime);
} else {
put(key, data);
}
} catch (Exception e) {
e.printStackTrace();
} finally {
try {
oos.close();
} catch (IOException e) {
}
}
}
/**
* @param key
* @param drawable
*/
public void put(String key, Drawable drawable) {
Log.e(TAG, "drawable--------->"+drawable);
if(drawable!=null){
put(key, Utils.drawable2Bitmap(drawable));
}
}
/**
* 读取 Drawable 数据
*/
public Drawable getAsDrawable(String key) {
if (getAsBinary(key) == null) {
return null;
}
return Utils.bitmap2Drawable(Utils.Bytes2Bimap(getAsBinary(key)));
}
}</span>
用到的工具类:
package com.zhimore.cache.utils;
import java.io.ByteArrayOutputStream;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Canvas;
import android.graphics.PixelFormat;
import android.graphics.drawable.BitmapDrawable;
import android.graphics.drawable.Drawable;
import android.util.Log;
public class Utils {
/**
* 判断缓存的String数据是否到期
*
* @param str
* @return true:到期了 false:还没有到期
*/
public static boolean isDue(String str) {
return isDue(str.getBytes());
}
/**
* 判断缓存的byte数据是否到期
*
* @param data
* @return true:到期了 false:还没有到期
*/
public static boolean isDue(byte[] data) {
String[] strs = getDateInfoFromDate(data);
if (strs != null && strs.length == 2) {
String saveTimeStr = strs[0];
while (saveTimeStr.startsWith("0")) {
saveTimeStr = saveTimeStr.substring(1, saveTimeStr.length());
}
long saveTime = Long.valueOf(saveTimeStr);
long deleteAfter = Long.valueOf(strs[1]);
if (System.currentTimeMillis() > saveTime + deleteAfter * 1000) {
return true;
}
}
return false;
}
public static String newStringWithDateInfo(int second, String strInfo) {
return createDateInfo(second) + strInfo;
}
public static byte[] newByteArrayWithDateInfo(int second, byte[] data2) {
byte[] data1 = createDateInfo(second).getBytes();
byte[] retdata = new byte[data1.length + data2.length];
System.arraycopy(data1, 0, retdata, 0, data1.length);
System.arraycopy(data2, 0, retdata, data1.length, data2.length);
return retdata;
}
public static String clearDateInfo(String strInfo) {
if (strInfo != null && hasDateInfo(strInfo.getBytes())) {
strInfo = strInfo.substring(strInfo.indexOf(mSeparator) + 1, strInfo.length());
}
return strInfo;
}
public static byte[] clearDateInfo(byte[] data) {
if (hasDateInfo(data)) {
return copyOfRange(data, indexOf(data, mSeparator) + 1, data.length);
}
return data;
}
public static boolean hasDateInfo(byte[] data) {
return data != null && data.length > 15 && data[13] == '-' && indexOf(data, mSeparator) > 14;
}
public static String[] getDateInfoFromDate(byte[] data) {
if (hasDateInfo(data)) {
String saveDate = new String(copyOfRange(data, 0, 13));
String deleteAfter = new String(copyOfRange(data, 14, indexOf(data, mSeparator)));
return new String[] { saveDate, deleteAfter };
}
return null;
}
public static int indexOf(byte[] data, char c) {
for (int i = 0; i < data.length; i++) {
if (data[i] == c) {
return i;
}
}
return -1;
}
public static byte[] copyOfRange(byte[] original, int from, int to) {
int newLength = to - from;
if (newLength < 0)
throw new IllegalArgumentException(from + " > " + to);
byte[] copy = new byte[newLength];
System.arraycopy(original, from, copy, 0, Math.min(original.length - from, newLength));
return copy;
}
public static final char mSeparator = ' ';
private static final String TAG = Utils.class.getSimpleName();
public static String createDateInfo(int second) {
String currentTime = System.currentTimeMillis() + "";
while (currentTime.length() < 13) {
currentTime = "0" + currentTime;
}
return currentTime + "-" + second + mSeparator;
}
/*
* Bitmap → byte[]
*/
public static byte[] Bitmap2Bytes(Bitmap bm) {
if (bm == null) {
return null;
}
ByteArrayOutputStream baos = new ByteArrayOutputStream();
bm.compress(Bitmap.CompressFormat.PNG, 100, baos);
return baos.toByteArray();
}
/*
* byte[] → Bitmap
*/
public static Bitmap Bytes2Bimap(byte[] b) {
if (b.length == 0) {
return null;
}
return BitmapFactory.decodeByteArray(b, 0, b.length);
}
/*
* Drawable → Bitmap
*/
public static Bitmap drawable2Bitmap(Drawable drawable) {
Log.e(TAG, "drawable-------->"+drawable);
if (drawable == null) {
return null;
}
// 取 drawable 的长宽
int w = drawable.getIntrinsicWidth();
int h = drawable.getIntrinsicHeight();
// 取 drawable 的颜色格式
Bitmap.Config config = drawable.getOpacity() != PixelFormat.OPAQUE ? Bitmap.Config.ARGB_8888 : Bitmap.Config.RGB_565;
// 建立对应 bitmap
Bitmap bitmap = Bitmap.createBitmap(w, h, config);
// 建立对应 bitmap 的画布
Canvas canvas = new Canvas(bitmap);
drawable.setBounds(0, 0, w, h);
// 把 drawable 内容画到画布中
drawable.draw(canvas);
Log.e(TAG, "bitmap-------->"+bitmap);
return bitmap;
}
/*
* Bitmap → Drawable
*/
@SuppressWarnings("deprecation")
public static Drawable bitmap2Drawable(Bitmap bm) {
if (bm == null) {
return null;
}
BitmapDrawable bd=new BitmapDrawable(bm);
bd.setTargetDensity(bm.getDensity());
return new BitmapDrawable(bm);
}
}