diff --git a/hutool-core/src/main/java/cn/hutool/core/date/DateUtil.java b/hutool-core/src/main/java/cn/hutool/core/date/DateUtil.java
index 66a04dd25..8721291f7 100755
--- a/hutool-core/src/main/java/cn/hutool/core/date/DateUtil.java
+++ b/hutool-core/src/main/java/cn/hutool/core/date/DateUtil.java
@@ -635,6 +635,57 @@ public class DateUtil extends CalendarUtil {
 
 		return CalendarUtil.formatChineseDate(CalendarUtil.calendar(date), withTime);
 	}
+
+
+	/**
+	 * 返回可读的时间间隔，如1天20小时3分48秒
+	 * @param milliSecond 毫秒
+	 * @author zrh 455741807@qq.com
+	 * @return
+	 */
+	public static String formatDuring(long milliSecond) {
+		final int i1000=1000;
+		if (milliSecond <= 0) {
+			return "小于1毫秒";
+		}
+		if (milliSecond < i1000) {
+			return milliSecond + "毫秒";
+		}
+		String result = "";
+		long days = milliSecond / (1000 * 60 * 60 * 24);
+		long hours = (milliSecond % (1000 * 60 * 60 * 24)) / (1000 * 60 * 60);
+		long minutes = (milliSecond % (1000 * 60 * 60)) / (1000 * 60);
+		long seconds = (milliSecond % (1000 * 60)) / 1000;
+		if (days > 0) {
+			result += days + "天";
+		}
+		if (hours > 0) {
+			result += hours + "小时";
+		}
+		if (minutes > 0) {
+			result += minutes + "分";
+		}
+		if (seconds >= 0) {
+			result += seconds + "秒";
+		}
+		return result;
+	}
+
+	/**
+	 * 返回两个日期之间间隔时间
+	 * @param begin 开始日期
+	 * @param end 结束日期
+	 * @author zrh 455741807@qq.com
+	 * @return
+	 */
+	public static String formatDuring(Date begin, Date end) {
+		if(begin == null || end == null) {
+			return "";
+		}
+		return formatDuring(end.getTime()-begin.getTime());
+	}
+
+
 	// ------------------------------------ Format end ----------------------------------------------
 
 	// ------------------------------------ Parse start ----------------------------------------------
diff --git a/hutool-core/src/test/java/cn/hutool/core/date/DateUtilTest.java b/hutool-core/src/test/java/cn/hutool/core/date/DateUtilTest.java
index 3984bf599..c0f1f72c8 100755
--- a/hutool-core/src/test/java/cn/hutool/core/date/DateUtilTest.java
+++ b/hutool-core/src/test/java/cn/hutool/core/date/DateUtilTest.java
@@ -97,6 +97,29 @@ public class DateUtilTest {
 		Assert.assertEquals(date, parse);
 	}
 
+
+	@Test
+	public void formatDuring() {
+		long d = 56123456;
+		String s = DateUtil.formatDuring(d);
+		Assert.assertEquals("15小时35分23秒", s);
+	}
+
+	@Test
+	public void testFormatDuring() {
+		Calendar c = Calendar.getInstance();
+		Date s = c.getTime();
+
+		c.add(Calendar.DAY_OF_MONTH, 1);
+		c.add(Calendar.MINUTE, 2);
+		c.add(Calendar.SECOND, 3);
+		Date e = c.getTime();
+
+		String str = DateUtil.formatDuring(s, e);
+
+		Assert.assertEquals("1天2分3秒", str);
+	}
+
 	@Test
 	public void beginAndEndTest() {
 		String dateStr = "2017-03-01 00:33:23";
diff --git a/hutool-json/src/main/java/cn/hutool/json/JSONConfig.java b/hutool-json/src/main/java/cn/hutool/json/JSONConfig.java
index 0b437a8f3..95b1039bf 100755
--- a/hutool-json/src/main/java/cn/hutool/json/JSONConfig.java
+++ b/hutool-json/src/main/java/cn/hutool/json/JSONConfig.java
@@ -44,6 +44,11 @@ public class JSONConfig implements Serializable {
 	 */
 	private boolean stripTrailingZeros = true;
 
+	/**
+	 * 是否忽略多个相同的key
+	 */
+	private boolean ignoreDuplicateKey = false;
+
 	/**
 	 * 创建默认的配置项
 	 *
@@ -235,4 +240,22 @@ public class JSONConfig implements Serializable {
 		this.stripTrailingZeros = stripTrailingZeros;
 		return this;
 	}
+
+	/**
+	 * 是否忽略多个相同的key
+	 * @return
+	 */
+	public boolean isIgnoreDuplicateKey() {
+		return ignoreDuplicateKey;
+	}
+
+	/**
+	 * 是否忽略多个相同的key
+	 * @param ignoreDuplicateKey
+	 * @return
+	 */
+	public JSONConfig setIgnoreDuplicateKey(boolean ignoreDuplicateKey) {
+		this.ignoreDuplicateKey = ignoreDuplicateKey;
+		return this;
+	}
 }
diff --git a/hutool-json/src/main/java/cn/hutool/json/JSONObject.java b/hutool-json/src/main/java/cn/hutool/json/JSONObject.java
index 921d19df8..1704c8daa 100755
--- a/hutool-json/src/main/java/cn/hutool/json/JSONObject.java
+++ b/hutool-json/src/main/java/cn/hutool/json/JSONObject.java
@@ -392,7 +392,9 @@ public class JSONObject extends MapWrapper<String, Object> implements JSON, JSON
 			// 忽略值模式下如果值为空清除key
 			this.remove(key);
 		} else {
-			if (checkDuplicate && containsKey(key)) {
+			/*如果允许多个key，就不抛出异常，使用后面的值覆盖前面的值*/
+			boolean ignoreDuplicateKey = this.config.isIgnoreDuplicateKey();
+			if (checkDuplicate && containsKey(key) && false == ignoreDuplicateKey) {
 				throw new JSONException("Duplicate key \"{}\"", key);
 			}
 
diff --git a/hutool-json/src/test/java/cn/hutool/json/JSONUtilTest.java b/hutool-json/src/test/java/cn/hutool/json/JSONUtilTest.java
index 3be9a3fbb..5f2e8bb41 100644
--- a/hutool-json/src/test/java/cn/hutool/json/JSONUtilTest.java
+++ b/hutool-json/src/test/java/cn/hutool/json/JSONUtilTest.java
@@ -234,4 +234,14 @@ public class JSONUtilTest {
 		final String xmlStr = JSONUtil.toXmlStr(obj);
 		Assert.assertEquals("<key1>v1</key1><key2>a</key2><key2>b</key2><key2>c</key2>", xmlStr);
 	}
+
+	@Test
+	public void testDuplicateKey(){
+		String str = "{id:123, name:\"张三\", name:\"李四\"}";
+
+		JSONObject jsonObject = JSONUtil.parseObj(str, JSONConfig.create().setIgnoreDuplicateKey(true));
+		System.out.println(jsonObject.toString());
+
+		Assert.assertNotNull(jsonObject);
+	}
 }