对字符串进行加密解密

java,对字符串(例:密码)进行加密解密,注意这个区分字符串大小写..........



加密-----------------------------------------------------------------------------
public String encodePWS(String SourceStr) {
		 String RetStr = "";
		    for (int i = 0; i <= SourceStr.length()-1; i++)
		    {
		        char c = SourceStr.charAt(i);
		        int h = (c >> 4) & 0xf;//   高4位
		        System.out.print(h);
		        int l = c & 0xf;               //   低4位
		        RetStr = RetStr + (char)('a' + h) + (char)('a' + l);
		    }
		    System.out.println(RetStr.length());
		    return RetStr;
	}

解密------------------------------------------------------------------------------
public String decodePWS(String SourceStr) {
		String RetStr = "";
		System.out.println(SourceStr+"------------------"+SourceStr.length());
	    for (int i = 0; i <= SourceStr.length()-1; i=i+2)
	    {
	        int h = SourceStr.charAt(i) - 'a';
	        System.out.print(h);
	        int l = SourceStr.charAt(i+1) - 'a';
	        System.out.print(l);
	        char c = (char) ((h << 4) + (l & 0xf));
	        RetStr = RetStr + c;
	    }
	    System.out.println("");
	    return RetStr;
	}

 

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