Initial project

src/main/java/com/imyeyu/utils/Decoder.java

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+package com.imyeyu.utils;
+
+import com.imyeyu.java.bean.timi.TimiCode;
+import com.imyeyu.java.bean.timi.TimiException;
+
+import java.io.StringWriter;
+import java.net.URLDecoder;
+import java.nio.charset.StandardCharsets;
+import java.util.Base64;
+
+/**
+ * 编码操作
+ *
+ * @author 夜雨
+ * @version 2021-02-13 10:59
+ */
+public class Decoder {
+
+	/**
+	 * 解码 Unicode 字符串
+	 *
+	 * @param data Unicode 字符串
+	 * @return 解码结果
+	 */
+	public static String unicode(String data) {
+		StringWriter out = new StringWriter(data.length());
+
+		StringBuilder unicode = new StringBuilder(4);
+		boolean hadSlash = false;
+		boolean inUnicode = false;
+		for (int i = 0, l = data.length(); i < l; i++) {
+			char c = data.charAt(i);
+			if (inUnicode) {
+				unicode.append(c);
+				if (unicode.length() == 4) {
+					try {
+						out.write((char) Integer.parseInt(unicode.toString(), 16));
+						unicode.setLength(0);
+						inUnicode = false;
+					} catch (NumberFormatException nfe) {
+						throw new TimiException(TimiCode.ERROR, "Unable to parse unicode value: " + unicode);
+					}
+				}
+				continue;
+			}
+			if (hadSlash) {
+				hadSlash = false;
+				switch (c) {
+					case '\\' -> out.write('\\');
+					case '\'' -> out.write('\'');
+					case '\"' -> out.write('"');
+					case 'r' -> out.write('\r');
+					case 'f' -> out.write('\f');
+					case 't' -> out.write('\t');
+					case 'n' -> out.write('\n');
+					case 'b' -> out.write('\b');
+					case 'u' -> inUnicode = true;
+					default -> out.write(c);
+				}
+				continue;
+			} else if (c == '\\') {
+				hadSlash = true;
+				continue;
+			}
+			out.write(c);
+		}
+		if (hadSlash) {
+			out.write('\\');
+		}
+		return out.toString();
+	}
+
+	/**
+	 * 解码 Base64 字符串
+	 *
+	 * @param data Base64 字符串
+	 * @return 解码结果
+	 */
+	public static byte[] base64(String data) {
+		return Base64.getDecoder().decode(data);
+	}
+
+	/**
+	 * 解码 Base64 字符串
+	 *
+	 * @param data Base64 字符串
+	 * @return 解码结果
+	 */
+	public static String base64String(String data) {
+		return new String(base64(data), StandardCharsets.UTF_8);
+	}
+
+	/**
+	 * 解码 URL 链接
+	 *
+	 * @param url 已编码的 URL 链接
+	 * @return 解码结果
+	 */
+	public static String url(String url) {
+		if (url == null) {
+			return "";
+		}
+		return URLDecoder.decode(url, StandardCharsets.UTF_8);
+	}
+}