Here you can find the source of encodeStringBase64(String str)
Encodes a given string to Base64.
| Parameter | Description |
|---|---|
| str | String. |
public static String encodeStringBase64(String str)
//package com.java2s; /* Util.java//from w w w. j ava2 s . c o m * * Networking ME * Copyright (c) 2013 eMob Tech (http://www.emobtech.com/) * * Permission is hereby granted, free of charge, to any person obtaining a copy * of this software and associated documentation files (the "Software"), to deal * in the Software without restriction, including without limitation the rights * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell * copies of the Software, and to permit persons to whom the Software is * furnished to do so, subject to the following conditions: * * The above copyright notice and this permission notice shall be included in * all copies or substantial portions of the Software. * * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN * THE SOFTWARE. */ import java.io.UnsupportedEncodingException; public class Main { /** * <p> * UTF-8 encoding. * </p> */ public static final String UTF8 = "UTF-8"; /** * <p> * Encodes a given string to Base64. * </p> * @param str String. * @return Base64 string. */ public static String encodeStringBase64(String str) { if (isEmptyString(str)) { return str; } // final String c = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/"; // byte[] code = c.getBytes(); byte[] s = str.getBytes(); int x; int y = str.length() - (str.length() % 3); byte[] coded = new byte[4]; StringBuffer dest = new StringBuffer(); // for (x = 0; x < y; x += 3) { coded[3] = code[s[x + 2] % 64]; coded[0] = code[s[x] >> 2]; coded[1] = new Integer((s[x] % 4) << 4).byteValue(); coded[1] += s[x + 1] >> 4; coded[1] = code[coded[1]]; coded[2] = new Integer((s[x + 1] % 16) << 2).byteValue(); coded[2] += s[x + 2] / 64; coded[2] = code[coded[2]]; // dest.append(new String(coded)); } // x = y; // if (s.length % 3 == 0) { return dest.toString(); } // if (s.length % 3 == 1) { coded[2] = '='; coded[3] = '='; coded[0] = code[s[x] >> 2]; coded[1] = code[new Integer((s[x] % 4) << 4).byteValue()]; // dest.append(new String(coded)); } // if (s.length % 3 == 2) { coded[3] = '='; coded[0] = code[s[x] >> 2]; coded[1] = new Integer((s[x] % 4) << 4).byteValue(); coded[1] += s[x + 1] >> 4; coded[1] = code[coded[1]]; coded[2] = code[new Integer((s[x + 1] % 16) << 2).byteValue()]; // dest.append(new String(coded)); } // return dest.toString(); } /** * <p> * Checks whether the given string is null or empty. * </p> * @param str The string. * @return true null/empty. */ public static boolean isEmptyString(String str) { return str == null || str.trim().length() == 0; } /** * <p> * Returns the string of a given bytes. * </p> * @param bytes Bytes. * @return String. */ public static String toString(byte[] bytes) { if (bytes == null || bytes.length == 0) { return ""; } // try { return new String(bytes, UTF8); } catch (UnsupportedEncodingException e) { return new String(bytes); } } }