json序列化时，增加允许多个相同的key配置

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;
+	}
 }

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);
 			}
 

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);
+	}
 }