用jackson处理json

src/main/scala/qm/jackson/Jackson.scala

+package qm.jackson
+
+import java.util
+import com.fasterxml.jackson.databind.ObjectMapper
+import com.fasterxml.jackson.module.scala.{DefaultScalaModule, ScalaObjectMapper}
+
+
+import scala.util.{Failure, Success, Try}
+
+/**
+ * @ClassName: Jackson
+ * @Description: TODO
+ * @Create by: LinYoung
+ * @Date: 2021/1/15 19:25
+ */
+object Jackson {
+  private val mapper = new ObjectMapper
+
+  mapper.registerModule(DefaultScalaModule)
+
+  /**
+   *
+   * @param value
+   * @return
+   */
+  def bean2String(value: Any): String = {
+    mapper.writeValueAsString(value)
+  }
+
+  /**
+   * 自动解析json串，递归处理json套json的字符串
+   *
+   * @param line       要处理的json字符串
+   * @param resultsMap 放返回结果的map
+   * @return 返回的结果
+   */
+  def autoParseJson(line: String, resultsMap: util.HashMap[String, Any]): util.HashMap[String, Any] = {
+    Try {
+      //json树
+      val jsonNode = mapper.readTree(line)
+      //获取节点名称
+      val keys = jsonNode.fieldNames
+
+      //循环读取节点信息
+      while (keys.hasNext) {
+        //取出节点的key
+        val key = keys.next
+
+        //取出子节点
+        val tmpNode = jsonNode.get(key)
+
+        //判断子节点
+        if (tmpNode.isObject) {
+          //json对象
+          autoParseJson(tmpNode.toString, resultsMap)
+        } else if (tmpNode.isArray) {
+          //json数组
+          resultsMap.put(key, tmpNode)
+        } else {
+          //其他类型
+          if (tmpNode.isTextual) {
+            resultsMap.put(key, tmpNode.asText)
+          } else {
+            resultsMap.put(key, tmpNode)
+          }
+        }
+      }
+    } match {
+
+      //发生异常的地方在readTree函数，如果发生异常，resultsMap
+      case Success(value) => resultsMap //返回结果
+      //      case Failure(exception) => new util.HashMap[String, Any] //返回空map
+      case Failure(exception) => resultsMap
+    }
+  }
+}