Java Base64 编码器和解码器
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Base64 encoder and decoder
提问by xydev
Is there a base-64 decoder and encoder for a String in Android?
Android 中是否有用于字符串的 base-64 解码器和编码器？
采纳答案by Dan D.
It seems that this was added in API version 8 or android 2.2 so it will not be available on the older platforms.
似乎这是在 API 版本 8 或 android 2.2 中添加的，因此在旧平台上将不可用。
But the source of it is at android/util/Base64.javaso if needed one could just copy it unchanged for older versions.
但是它的来源在android/util/Base64.java所以如果需要，可以将它复制到旧版本不变。
回答by blackpanther
This is an example of how to use the Base64class to encode and decode a simple String value.
这是一个如何使用Base64该类对简单字符串值进行编码和解码的示例。
// String to be encoded with Base64
String text = "Test";
// Sending side
byte[] data = null;
try {
data = text.getBytes("UTF-8");
} catch (UnsupportedEncodingException e1) {
e1.printStackTrace();
}
String base64 = Base64.encodeToString(data, Base64.DEFAULT);
// Receiving side
byte[] data1 = Base64.decode(base64, Base64.DEFAULT);
String text1 = null;
try {
text1 = new String(data1, "UTF-8");
} catch (UnsupportedEncodingException e) {
e.printStackTrace();
}
This excerpt can be included in an Android activity.
此摘录可以包含在 Android 活动中。
回答by Jared Burrows
Here is a simple method I was going to use until I realized that this is only supported in Android API 8+:
这是我打算使用的一个简单方法，直到我意识到这仅在Android API 8+ 中受支持：
// Has line break
public String getBase64(String input) {
return Base64.encodeToString(input.getBytes(), Base64.DEFAULT);
}
// No line break
public String getBase64(String input) {
return Base64.encodeToString(input.getBytes(), Base64.NO_WRAP);
}
回答by Hugo Gresse
If you don'twant a line breakat the end of the String, change the flags from Base64.DEFAULTto Base64.NO_WRAP
如果你不想要一个换行符在字符串的结尾，标志从改变Base64.DEFAULT到Base64.NO_WRAP
Base64.encodeToString("yourString".getBytes("UTF-8"), Base64.NO_WRAP);
回答by CommonSenseCode
To encode:
编码：
private String encodeString(String s) {
byte[] data = new byte[0];
try {
data = s.getBytes("UTF-8");
} catch (UnsupportedEncodingException e) {
e.printStackTrace();
} finally {
String base64Encoded = Base64.encodeToString(data, Base64.DEFAULT);
return base64Encoded;
}
}
To decode:
解码：
private String decodeString(String encoded) {
byte[] dataDec = Base64.decode(encoded, Base64.DEFAULT);
String decodedString = "";
try {
decodedString = new String(dataDec, "UTF-8");
} catch (UnsupportedEncodingException e) {
e.printStackTrace();
} finally {
return decodedString;
}
}
Example
例子
String text = "example007";
Log.e("encoded", encodeString(text)); //Output: ZXhhbXBsZTAwNw==
Log.e("decoded", decodeString(encodeString(text))); //Output: example007
