JAVA简单英文段加密和解密，求高手请教

加密方法如图片 A加密为W B加密为R 这样
比如输入ATTACK AT DAWN
则加密后为WPPWEK WP AWTG
反之输入WPPWEK WP AWTG
解密后为ATTACK AT DAWN

按照你的对应表做的，结果与你列出的不符，是你那个表关系的问题，
逻辑上没有问题

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import java.util.HashMap;
import java.util.Map;

public class Test {

private static String pattern = "ABCDEFGHIJKLMNOPQRSTUVWXYZ";
private static String patternAs = "WREAKHOVOCABDFGIJLMNPQSTUXZ";
private static Map<String, String> mapEnc = new HashMap<String, String>();
private static Map<String, String> mapDec = new HashMap<String, String>();

public static void main(String[] args) throws Exception {
for (int i = 0; i < pattern.length(); i++) {
String key = pattern.substring(i, i + 1);
String value = patternAs.substring(i, i + 1);
mapEnc.put(key, value);
}
for (int i = 0; i < pattern.length(); i++) {
String key = patternAs.substring(i, i + 1);
String value = pattern.substring(i, i + 1);
mapDec.put(key, value);
}

String src = "ATTACK AT DAWN";
String dest = toEncryption(src);
src = toDecrypt(dest);
System.out.println(dest);
System.out.println(src);
}

public static String toEncryption(String str) {
StringBuffer buff = new StringBuffer();
for (int i = 0; i < str.length(); i++) {
String src = str.substring(i, i + 1);
if (src.matches("[A-Z]")) {
buff.append(mapEnc.get(src));
} else {
buff.append(src);
}
}
return buff.toString();
}

public static String toDecrypt(String str) {
StringBuffer buff = new StringBuffer();
for (int i = 0; i < str.length(); i++) {
String src = str.substring(i, i + 1);
if (src.matches("[A-Z]")) {
buff.append(mapDec.get(src));
} else {
buff.append(src);
}
}
return buff.toString();
}
}

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