java base64编码和解码的三种方式_java base64 编码解码
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方式一:使用commons-codec.jar
/**
* @param bytes
* @return
*/
public static byte[] decode(final byte[] bytes) {
return Base64.decodeBase64(bytes);
}
/**
* 二进制数据编码为BASE64字符串
*
* @param bytes
* @return
* @throws Exception
*/
public static String encode(final byte[] bytes) {
return new String(Base64.encodeBase64(bytes));
}
测试:
String base64String = "whuang123";
byte[] result = Base64.encodeBase64(base64String.getBytes());
方式二:通过反射使用java 中不对外公开的类
/***
* encode by Base64
*/
public static String encodeBase64(byte[]input) throws Exception{
Class clazz=Class.forName("com.sun.org.apache.xerces.internal.impl.dv.util.Base64");
Method mainMethod= clazz.getMethod("encode", byte[].class);
mainMethod.setAccessible(true);
Object retObj=mainMethod.invoke(null, new Object[]{input});
return (String)retObj;
}
/***
* decode by Base64
*/
public static byte[] decodeBase64(String input) throws Exception{
Class clazz=Class.forName("com.sun.org.apache.xerces.internal.impl.dv.util.Base64");
Method mainMethod= clazz.getMethod("decode", String.class);
mainMethod.setAccessible(true);
Object retObj=mainMethod.invoke(null, input);
return (byte[])retObj;
}
方式三:使用sun.misc.BASE64Encoder
/**
* 编码
*
* @param bstr
* @return String
*/
public static String encode(byte[] bstr) {
return new sun.misc.BASE64Encoder().encode(bstr);
}
/**
* 解码
*
* @param str
* @return string
*/
public static byte[] decode(String str) {
byte[] bt = null;
try {
sun.misc.BASE64Decoder decoder = new sun.misc.BASE64Decoder();
bt = decoder.decodeBuffer(str);
} catch (IOException e) {
e.printStackTrace();
}
return bt;
}
测试:
package com.jn.base64;
import junit.framework.Assert;
import org.apache.commons.codec.binary.Base64;
import com.common.util.SystemUtil;
public class BaseTest {
public static void main(String[] args) throws Exception {
String base64String = "whuang123";
byte[] result = Base64.encodeBase64(base64String.getBytes());
SystemUtil.printBytes(result);
byte[] result2 = SystemUtil.encode(base64String.getBytes()).getBytes();
System.out.println("result2:"+result2);
byte[] result3 = SystemUtil.encodeBase64(base64String.getBytes()).getBytes();
boolean isSuccess = SystemUtil.isSame(result, result2);
Assert.assertEquals(true, isSuccess);
SystemUtil.printBytes(result2);
SystemUtil.printBytes(result3);
System.out.println(isSuccess);
}
}
原文链接：https://blog.csdn.net/weixin_30131185/article/details/114183329
