fix parse bug

hutool-json/src/test/java/cn/hutool/json/JSONUtilTest.java

@@ -15,6 +15,8 @@ import java.sql.SQLException;
 import java.util.ArrayList;
 import java.util.HashMap;
 import java.util.Map;
+import java.util.SortedMap;
+import java.util.TreeMap;
 
 public class JSONUtilTest {
 
@@ -102,6 +104,20 @@ public class JSONUtilTest {
 		Assert.assertEquals("{\"name\":\"123123\",\"value\":\"\\\\\",\"value2\":\"</\"}", json2.get("user"));
 	}
 
+	@Test
+	public void toJsonStrFromSortedTest() {
+		SortedMap<Object, Object> sortedMap = new TreeMap<Object, Object>() {
+			private static final long serialVersionUID = 1L;
+
+			{
+			put("attributes", "a");
+			put("b", "b");
+			put("c", "c");
+		}};
+
+		Assert.assertEquals("{\"attributes\":\"a\",\"b\":\"b\",\"c\":\"c\"}", JSONUtil.toJsonStr(sortedMap));
+	}
+
 	/**
 	 * 泛型多层嵌套测试
 	 */
@@ -196,6 +212,8 @@ public class JSONUtilTest {
 		final JSONObject jsonObject = JSONUtil.parseObj("{\n" +
 				"    \"test\": \"\\\\地库地库\",\n" +
 				"}");
+
+		Assert.assertEquals("\\地库地库", jsonObject.getObj("test"));
 	}
 
 	@Test