进一步优化 json 工具类，默认使用 Spring 初始化出来的

src/main/java/cn/iocoder/dashboard/util/json/JsonUtils.java

@@ -1,25 +1,33 @@
 package cn.iocoder.dashboard.util.json;
 
 import com.fasterxml.jackson.core.JsonProcessingException;
+import com.fasterxml.jackson.core.type.TypeReference;
 import com.fasterxml.jackson.databind.ObjectMapper;
 
 import java.io.IOException;
+import java.util.Set;
 
 /**
  * JSON 工具类
  *
  * @author 芋道源码
  */
-public class JSONUtils {
+public class JsonUtils {
 
     private static ObjectMapper objectMapper = new ObjectMapper();
 
-    // TODO 芋艿，需要将 Spring 的设置下进来
-    public static void setObjectMapper(ObjectMapper objectMapper) {
-        JSONUtils.objectMapper = objectMapper;
+    /**
+     * 初始化 objectMapper 属性
+     *
+     * 通过这样的方式，使用 Spring 创建的 ObjectMapper Bean
+     *
+     * @param objectMapper ObjectMapper 对象
+     */
+    public static void init(ObjectMapper objectMapper) {
+        JsonUtils.objectMapper = objectMapper;
     }
 
-    public static String toJSONString(Object object) {
+    public static String toJsonString(Object object) {
         try {
             return objectMapper.writeValueAsString(object);
         } catch (JsonProcessingException e) {
@@ -43,4 +51,12 @@ public class JSONUtils {
         }
     }
 
+    public static Object parseObject(String text, TypeReference<Set<Long>> typeReference) {
+        try {
+            return objectMapper.readValue(text, typeReference);
+        } catch (IOException e) {
+            throw new RuntimeException(e);
+        }
+    }
+
 }

src/main/java/cn/iocoder/dashboard/util/servlet/ServletUtils.java

@@ -2,7 +2,7 @@ package cn.iocoder.dashboard.util.servlet;
 
 import cn.hutool.core.io.IoUtil;
 import cn.hutool.extra.servlet.ServletUtil;
-import cn.iocoder.dashboard.util.json.JSONUtils;
+import cn.iocoder.dashboard.util.json.JsonUtils;
 import org.springframework.http.MediaType;
 import org.springframework.web.context.request.RequestAttributes;
 import org.springframework.web.context.request.RequestContextHolder;
@@ -28,7 +28,7 @@ public class ServletUtils {
      */
     @SuppressWarnings("deprecation") // 必须使用 APPLICATION_JSON_UTF8_VALUE，否则会乱码
     public static void writeJSON(HttpServletResponse response, Object object) {
-        String content = JSONUtils.toJSONString(object);
+        String content = JsonUtils.toJsonString(object);
         ServletUtil.write(response, content, MediaType.APPLICATION_JSON_UTF8_VALUE);
     }