base64编码解码

﹏ヽ暗。殇╰゛Y 2022-08-21 11:54 298阅读 0赞

调用：

---js
    var s = new base64InOut();
    //编码
    var values = s.base64Encodes("这是base64");
    //解码
    var mm = s.base64Decodes("这是base64");
    
    --java
    Base64EnOut base64EnOut = new Base64EnOut();
    //解码
    String s = base64EnOut.Decode("这是base64");
    //编码
    String mm = base64EnOut.Encode("这是base64");

Java：

public class Base64EnOut {
    
    	private static final String  EncodeChars = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
    	private static final int[]  DecodeChars=new int[]{
    		-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
            -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
            -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 62, -1, -1, -1,
            63, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, -1, -1, -1, -1, -1, -1, -1,
            0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19,
            20, 21, 22, 23, 24, 25, -1, -1, -1, -1, -1, -1, 26, 27, 28, 29, 30, 31,
            32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49,
            50, 51, -1, -1, -1, -1, -1
    	};
    	
    	/**
    	 * 编码
    	 * @param text
    	 * @return
    	 */
    	public static String Base64Encode(String text){
    		int i=0;
            int len=text.length();
            int c1;
            int c2;
            int c3;
            
            char[] base64EncodeChars=EncodeChars.toCharArray();
            char[] c = text.toCharArray();
            
            StringBuffer sb=new StringBuffer(50);
              
            while(i<len){
                c1=((int)c[i++]) & 0xff;
    
                if(i==len){
                    sb.append(base64EncodeChars[c1 >>2]);
                    sb.append(base64EncodeChars[(c1 & 0x3) << 4]);
                    sb.append( "==");
                     break;
                }
                c2 = ((int)c[i++]);
                if (i == len) {
                    sb.append(base64EncodeChars[c1 >>2]);
                    sb.append(base64EncodeChars[((c1 & 0x3) << 4) | ((c2 & 0xF0) >> 4)]);
                    sb.append(base64EncodeChars[(c2 & 0xF) << 2]);
                    sb.append( "=");
                    break;
                }
                 c3 =((int)c[i++]);
                    sb.append(base64EncodeChars[c1 >>2]);
                    sb.append(base64EncodeChars[((c1 & 0x3) << 4) | ((c2 & 0xF0) >> 4)]);
    
                    sb.append(base64EncodeChars[((c2 & 0xF) << 2) | ((c3 & 0xC0) >> 6)]);
                    sb.append(base64EncodeChars[c3 & 0x3F]);
            }
            return sb.toString();
    	}
    	/**
    	 * 解码
    	 * @param text
    	 * @return
    	 */
    	public static String Base64Decode(String text){
    		int c1;
            int c2;
            int c3;
            int c4;
            int i=0;
            int len=text.length();
    
            int [] base64DecodeChars=DecodeChars;
            StringBuffer sb=new StringBuffer();
            char[] c = text.toCharArray();
             
            while (i < len)
            {
                do
                {
                    c1 = base64DecodeChars[((int)c[i++]) & 0xff];
                } while (i < len && c1 == -1);
                if (c1 == -1)
                    break;
                /* c2 */
                do
                {
                    c2 = base64DecodeChars[((int)c[i++]) & 0xff];
                } while (i < len && c2 == -1);
                if (c2 == -1)
                    break;
                sb.append((char)((c1 << 2) | ((c2 & 0x30) >> 4)));
                /* c3 */
                do
                {
                    c3 = ((int)c[i++]) & 0xff;
                    if (c3 == 61)
                        return sb.toString();
    
                    c3 = base64DecodeChars[c3];
                } while (i < len && c3 == -1);
                if (c3 == -1)
                    break;
                sb.append((char)(((c2 & 0XF) << 4) | ((c3 & 0x3C) >> 2)));
                /* c4 */
                do
                {
                    c4 =((int)c[i++]) & 0xff;
                    if (c4 == 61)
                        return sb.toString();
                    c4 = base64DecodeChars[c4];
                } while (i < len && c4 == -1);
                if (c4 == -1)
                    break;
                sb.append((char)(((c3 & 0x03) << 6) | c4));
    
            }
            return sb.toString();
    	}
    	/**
    	 * 中文转成字符
    	 * @param text
    	 * @return
    	 */
    	public static String Utf16to8(String text){
    		String out="";
    		
    		int len=text.length();
    		char[] chars=text.toCharArray();
    		int c;
    		 
             for (int i = 0; i < len; i++) {
                 c =(int)chars[i]; // str.charCodeAt(i);
                 if ((c >= 0x0001) && (c <= 0x007F)) {
                     out += chars[i];
                 } else if (c > 0x07FF) {
                     out +=(char)(0xE0 | ((c >> 12) & 0x0F));
                     out += (char)(0x80 | ((c >> 6) & 0x3F));
                     out += (char)(0x80 | ((c >> 0) & 0x3F));
                 } else {
                     out +=(char)(0xC0 | ((c >> 6) & 0x1F));
                     out +=(char)(0x80 | ((c >> 0) & 0x3F));
                 }
             }
    		return out;
    	}
    	
    	/**
    	 * 字符转成中文
    	 * @param text
    	 * @return
    	 */
    	public static String Utf8to16(String text){
    		String out="";
    		int i=0;
    		int len=text.length();
    		char[] chars=text.toCharArray();
    		int c;
    		  
    		int char2;
    		int char3;
             //var char2, char3;
           
             while (i < len) {
                 c = (int)chars[i++];
                 switch (c >> 4) {
                     case 0:
                     case 1:
                     case 2:
                     case 3:
                     case 4:
                     case 5:
                     case 6:
                     case 7:
                         // 0xxxxxxx
                         out += chars[i - 1];
                         break;
                     case 12:
                     case 13:
                         // 110x xxxx 10xx xxxx
                         char2 = (int)chars[i++];
                         out += (char)(((c & 0x1F) << 6) | (char2 & 0x3F));
                         break;
                     case 14:
                         // 1110 xxxx 10xx xxxx 10xx xxxx
                         char2 =  (int)chars[i++];
                         char3 =  (int)chars[i++];
                         out += (char)(((c & 0x0F) << 12)
                                 | ((char2 & 0x3F) << 6) | ((char3 & 0x3F) << 0));
                         break;
                 }
             }
             return out;
    	}
    	
    	/**
    	 * 编码
    	 * @param text
    	 * @return
    	 */
    	public static String Encode(String text){
    		return Base64Encode(Utf16to8(text));
    	}
    	
    	/**
    	 * 解码
    	 * @author zyj
    	 * @time:2014年12月24日 上午11:19:19
    	 * @param text
    	 * @return
    	 */
    	public static String Decode(String text){
    		return Utf8to16(Base64Decode(text));
    	}
    	
    }

Js：