✨ 扩展 Map 工具类，String 转 Map

Author: xkcoding

src/main/java/com/xkcoding/http/util/MapUtil.java

@@ -16,12 +16,10 @@
 
 package com.xkcoding.http.util;
 
+import com.xkcoding.http.constants.Constants;
 import lombok.experimental.UtilityClass;
 
-import java.util.ArrayList;
-import java.util.ConcurrentModificationException;
-import java.util.List;
-import java.util.Map;
+import java.util.*;
 import java.util.function.BiConsumer;
 
 /**
@@ -98,4 +96,103 @@ public String parseMapToString(Map<String, String> params, boolean encode) {
 		});
 		return String.join("&", paramList);
 	}
+
+	/**
+	 * 字符串转map，字符串格式为 {@code xxx=xxx&xxx=xxx}
+	 *
+	 * @param str    待转换的字符串
+	 * @param decode 是否解码
+	 * @return map
+	 */
+	public Map<String, String> parseStringToMap(String str, boolean decode) {
+		str = preProcess(str);
+
+		Map<String, String> params = new HashMap<>(16);
+		if (StringUtil.isEmpty(str)) {
+			return params;
+		}
+
+		if (!str.contains("&")) {
+			params.put(decode(str, decode), Constants.EMPTY);
+			return params;
+		}
+
+		final int len = str.length();
+		String name = null;
+		// 未处理字符开始位置
+		int pos = 0;
+		// 未处理字符结束位置
+		int i;
+		// 当前字符
+		char c;
+		for (i = 0; i < len; i++) {
+			c = str.charAt(i);
+			// 键值对的分界点
+			if (c == '=') {
+				if (null == name) {
+					// name可以是""
+					name = str.substring(pos, i);
+				}
+				pos = i + 1;
+			}
+			// 参数对的分界点
+			else if (c == '&') {
+				if (null == name && pos != i) {
+					// 对于像&a&这类无参数值的字符串，我们将name为a的值设为""
+					addParam(params, str.substring(pos, i), Constants.EMPTY, decode);
+				} else if (name != null) {
+					addParam(params, name, str.substring(pos, i), decode);
+					name = null;
+				}
+				pos = i + 1;
+			}
+		}
+
+		// 处理结尾
+		if (pos != i) {
+			if (name == null) {
+				addParam(params, str.substring(pos, i), Constants.EMPTY, decode);
+			} else {
+				addParam(params, name, str.substring(pos, i), decode);
+			}
+		} else if (name != null) {
+			addParam(params, name, Constants.EMPTY, decode);
+		}
+
+		return params;
+	}
+
+	private void addParam(Map<String, String> params, String key, String value, boolean decode) {
+		key = decode(key, decode);
+		value = decode(value, decode);
+		if (params.containsKey(key)) {
+			params.put(key, params.get(key) + "," + value);
+		} else {
+			params.put(key, value);
+		}
+	}
+
+	private String decode(String str, boolean decode) {
+		return decode ? UrlUtil.urlDecode(str) : str;
+	}
+
+
+	private String preProcess(String str) {
+		if (StringUtil.isEmpty(str)) {
+			return str;
+		}
+		// 去除 URL 路径信息
+		int beginPos = str.indexOf("?");
+		if (beginPos > -1) {
+			str = str.substring(beginPos + 1);
+		}
+
+		// 去除 # 后面的内容
+		int endPos = str.indexOf("#");
+		if (endPos > -1) {
+			str = str.substring(0, endPos);
+		}
+
+		return str;
+	}
 }

src/main/java/com/xkcoding/http/util/StringUtil.java

@@ -30,7 +30,7 @@
 public class StringUtil {
 
 	public static boolean isEmpty(String str) {
-		return null == str || str.isEmpty();
+		return null == str || str.trim().isEmpty();
 	}
 
 	public static boolean isNotEmpty(String str) {

src/main/java/com/xkcoding/http/util/UrlUtil.java

@@ -16,10 +16,12 @@
 
 package com.xkcoding.http.util;
 
+import cn.hutool.core.exceptions.UtilException;
 import com.xkcoding.http.constants.Constants;
 import lombok.experimental.UtilityClass;
 
 import java.io.UnsupportedEncodingException;
+import java.net.URLDecoder;
 import java.net.URLEncoder;
 
 /**
@@ -49,4 +51,23 @@ public String urlEncode(String value) {
 			throw new RuntimeException("Failed To Encode Uri", e);
 		}
 	}
+
+	/**
+	 * 解码URL<br>
+	 * 将%开头的16进制表示的内容解码。
+	 *
+	 * @param url URL
+	 * @return 解码后的URL
+	 * @throws UtilException UnsupportedEncodingException
+	 */
+	public String urlDecode(String url) throws UtilException {
+		if (StringUtil.isEmpty(url)) {
+			return url;
+		}
+		try {
+			return URLDecoder.decode(url, Constants.DEFAULT_ENCODING.displayName());
+		} catch (UnsupportedEncodingException e) {
+			throw new RuntimeException("Unsupported encoding", e);
+		}
+	}
 }