以下代码亲测有效，放心使用。
1、前端加密、解密算法：
//加密字符串,可以先将中文加密，然后再用btoa加密function encryption(str){var encStr = encodeURIComponent(str);encStr = btoa(encStr);return encStr;}//解密，可以先将ascii解密，然后再将非ascii解密function decrypt(str){var decStr = atob(str);decStr = decodeURIComponent(decStr);return decStr;}
2、java后台加密、解密算法：
import java.io.UnsupportedEncodingException;import .URLDecoder;import .URLEncoder;import java.util.regex.Matcher;import java.util.regex.Pattern;import org.apache.log4j.Logger;/*** @author zxy* @date 8月24日 上午11:20:16* @Description : 字符串加密类*/public class BtoAAtoB {private static Logger log = Logger.getLogger("BtoAAtoB.class");private static String base64hash = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";public static boolean isMatcher(String inStr, String reg) {Pattern pattern = pile(reg);Matcher matcher = pattern.matcher(inStr);if (matcher.matches()) {return true;}return false;}/*** btoa method* @param inStr* @return*/public static String btoa(String inStr) {if (inStr == null || isMatcher(inStr, "([^\\u0000-\\u00ff])")) {return null;}StringBuilder result = new StringBuilder();int i = 0;int mod = 0;int ascii;int prev = 0;while (i < inStr.length()) {ascii = inStr.charAt(i);mod = i % 3;switch (mod) {case 0:result.append(String.valueOf(base64hash.charAt(ascii >> 2)));break;case 1:result.append(String.valueOf(base64hash.charAt((prev & 3) << 4 | (ascii >> 4))));break;case 2:result.append(String.valueOf(base64hash.charAt((prev & 0x0f) << 2 | (ascii >> 6))));result.append(String.valueOf(base64hash.charAt(ascii & 0x3f)));break;}prev = ascii;i++;}if (mod == 0) {result.append(String.valueOf(base64hash.charAt((prev & 3) << 4)));result.append("==");} else if (mod == 1) {result.append(String.valueOf(base64hash.charAt((prev & 0x0f) << 2)));result.append("=");}return result.toString();}/*** atob method 逆转encode的思路即可* @param inStr* @return*/public static String atob(String inStr) {if (inStr == null)return null;inStr = inStr.replaceAll("\\s|=", "");StringBuilder result = new StringBuilder();int cur;int prev = -1;int mod;int i = 0;while (i < inStr.length()) {cur = base64hash.indexOf(inStr.charAt(i));mod = i % 4;switch (mod) {case 0:break;case 1:result.append(String.valueOf((char) (prev << 2 | cur >> 4)));break;case 2:result.append(String.valueOf((char) ((prev & 0x0f) << 4 | cur >> 2)));break;case 3:result.append(String.valueOf((char) ((prev & 3) << 6 | cur)));break;}prev = cur;i++;}return result.toString();}/*** 加密字符串* @return*/public static String encryption(String str) {String encode;try {encode = URLEncoder.encode(str,"utf-8");encode=encode.replaceAll("\\+", "%20");//URLEncoder.encode 会将空格解释为+号String btoa = BtoAAtoB.btoa(encode);return btoa;} catch (UnsupportedEncodingException e) {log.info("btoa加密函数出现错误。");}return str;}/*** 解密字符串* @return*/public static String decrypt(String str) {String atob = BtoAAtoB.atob(str);try {String decode = URLDecoder.decode(atob, "utf-8");return decode;} catch (UnsupportedEncodingException e) {log.info("atob加密函数出现错误。");}return str;}}
