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app/src/main/java/com/gh/common/util/TimestampUtils.java

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+package com.gh.common.util;
+
+public class TimestampUtils {
+
+	// 基准时间
+	private static final long BASE = 1426608000000L;
+
+	/*
+	 * 根据CD获取时间戳
+	 */
+	public static long getTimestamp(int cd) {
+		long now = System.currentTimeMillis();
+		return (long) (Math.ceil((now - BASE) / cd) * cd + BASE);
+	}
+
+	/*
+	 * 为url添加timestamp
+	 */
+	public static String addTimestamp(String url, int cd) {
+		if (url.contains("?")) {
+			return url + "&timestamp=" + getTimestamp(cd);
+		} else {
+			return url + "?timestamp=" + getTimestamp(cd);
+		}
+	}
+	
+	/*
+	 * 去除url中的timestamp
+	 */
+	public static String removeTimestamp(String url) {
+		int index = url.lastIndexOf("timestamp");
+		String params = url.substring(index);
+		//连接符
+		String connector = url.substring(index - 1, index);
+		String key = url.substring(0, index - 1);
+		index = params.indexOf("&");
+		if (index != -1) {
+			key = key + connector + params.substring(index + 1);
+		}
+		return key;
+	}
+
+}