OSC存储配置数据方式有两种,一种是shraredPreference 另一种是property
相比前者,使用propertys 存储数据有如下优点:
1.占用空间小,方便加密 ,
2.单纯的文件存储,代码比较容易理解.
3.Property 应该比xml 应该读取更快,但是具体没有测试
OSC中关于cookie token 图片路径等一些琐碎的数据都是通过property存储的。
用法如下, 在实际开发中其实也可以Properties.get(String key) 返回的是 object
代码在AppConfig.java中
public String get(String key) {
Properties props = get();
return (props != null) ? props.getProperty(key) : null;
}
public Properties get() {
FileInputStream fis = null;
Properties props = new Properties();
try {
// 读取files目录下的config
// fis = activity.openFileInput(APP_CONFIG);
// 读取app_config目录下的config
File dirConf = mContext.getDir(APP_CONFIG, Context.MODE_PRIVATE);
fis = new FileInputStream(dirConf.getPath() + File.separator
+ APP_CONFIG);
props.load(fis);
} catch (Exception e) {
} finally {
try {
fis.close();
} catch (Exception e) {
}
}
return props;
}
private void setProps(Properties p) {
FileOutputStream fos = null;
try {
// 把config建在files目录下
// fos = activity.openFileOutput(APP_CONFIG, Context.MODE_PRIVATE);
// 把config建在(自定义)app_config的目录下
File dirConf = mContext.getDir(APP_CONFIG, Context.MODE_PRIVATE);
File conf = new File(dirConf, APP_CONFIG);
fos = new FileOutputStream(conf);
p.store(fos, null);
fos.flush();
} catch (Exception e) {
e.printStackTrace();
} finally {
try {
fos.close();
} catch (Exception e) {
}
}
}
public void set(Properties ps) {
Properties props = get();
props.putAll(ps);
setProps(props);
}
public void set(String key, String value) {
Properties props = get();
props.setProperty(key, value);
setProps(props);
}
public void remove(String... key) {
Properties props = get();
for (String k : key)
props.remove(k);
setProps(props);
}
加密处理类如下 配合上面的property 就可以对一下配置信息进行加密了。
/**
* 加密解密工具包
* @author Winter Lau
* @date 2011-12-26
*/
public class CyptoUtils {
public static final String ALGORITHM_DES = "DES/CBC/PKCS5Padding";
/**
* DES算法,加密
*
* @param data 待加密字符串
* @param key 加密私钥,长度不能够小于8位
* @return 加密后的字节数组,一般结合Base64编码使用
* @throws InvalidAlgorithmParameterException
* @throws Exception
*/
public static String encode(String key,String data) {
if(data == null)
return null;
try{
DESKeySpec dks = new DESKeySpec(key.getBytes());
SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("DES");
//key的长度不能够小于8位字节
Key secretKey = keyFactory.generateSecret(dks);
Cipher cipher = Cipher.getInstance(ALGORITHM_DES);
IvParameterSpec iv = new IvParameterSpec("12345678".getBytes());
AlgorithmParameterSpec paramSpec = iv;
cipher.init(Cipher.ENCRYPT_MODE, secretKey,paramSpec);
byte[] bytes = cipher.doFinal(data.getBytes());
return byte2hex(bytes);
}catch(Exception e){
e.printStackTrace();
return data;
}
}
/**
* DES算法,解密
*
* @param data 待解密字符串
* @param key 解密私钥,长度不能够小于8位
* @return 解密后的字节数组
* @throws Exception 异常
*/
public static String decode(String key,String data) {
if(data == null)
return null;
try {
DESKeySpec dks = new DESKeySpec(key.getBytes());
SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("DES");
//key的长度不能够小于8位字节
Key secretKey = keyFactory.generateSecret(dks);
Cipher cipher = Cipher.getInstance(ALGORITHM_DES);
IvParameterSpec iv = new IvParameterSpec("12345678".getBytes());
AlgorithmParameterSpec paramSpec = iv;
cipher.init(Cipher.DECRYPT_MODE, secretKey, paramSpec);
return new String(cipher.doFinal(hex2byte(data.getBytes())));
} catch (Exception e){
e.printStackTrace();
return data;
}
}
/**
* 二行制转字符串
* @param b
* @return
*/
private static String byte2hex(byte[] b) {
StringBuilder hs = new StringBuilder();
String stmp;
for (int n = 0; b!=null && n < b.length; n++) {
stmp = Integer.toHexString(b[n] & 0XFF);
if (stmp.length() == 1)
hs.append('0');
hs.append(stmp);
}
return hs.toString().toUpperCase();
}
private static byte[] hex2byte(byte[] b) {
if((b.length%2)!=0)
throw new IllegalArgumentException();
byte[] b2 = new byte[b.length/2];
for (int n = 0; n < b.length; n+=2) {
String item = new String(b,n,2);
b2[n/2] = (byte)Integer.parseInt(item,16);
}
return b2;
}
}
至此,OSC的学习就全部结束了。OSC 代码中还有很多值得学习的地方,希望android初学者好好学习之。再次感谢作者的无私奉献。