代码调整.

mybatis-plus-core/src/main/java/com/baomidou/mybatisplus/core/handlers/IJsonTypeHandler.java

@@ -21,6 +21,12 @@ import com.baomidou.mybatisplus.annotation.TableName;
  * Json类型处理器接口(实现类确保为多例状态).
  * <p>
  * 注意:查询返回时需要使用resultMap
+ *
+ * <pre>
+ * Example:
+ *     &lt;result property="xx" column="xx" javaType="list" typeHandler="com.baomidou.mybatisplus.extension.handlers.GsonTypeHandler"/&gt;
+ *     &lt;result property="xx" column="xx" typeHandler="com.baomidou.mybatisplus.extension.handlers.GsonTypeHandler"/&gt;
+ * </pre>
  * </p>
  *
  * @author nieqiurong 2024年3月4日

mybatis-plus-extension/src/main/java/com/baomidou/mybatisplus/extension/handlers/AbstractJsonTypeHandler.java

@@ -18,10 +18,10 @@ package com.baomidou.mybatisplus.extension.handlers;
 import com.baomidou.mybatisplus.core.handlers.IJsonTypeHandler;
 import com.baomidou.mybatisplus.core.toolkit.Assert;
 import com.baomidou.mybatisplus.core.toolkit.StringUtils;
+import org.apache.ibatis.logging.Log;
+import org.apache.ibatis.logging.LogFactory;
 import org.apache.ibatis.type.BaseTypeHandler;
 import org.apache.ibatis.type.JdbcType;
-import org.slf4j.Logger;
-import org.slf4j.LoggerFactory;
 
 import java.lang.reflect.Field;
 import java.lang.reflect.Type;
@@ -36,7 +36,7 @@ import java.sql.SQLException;
  */
 public abstract class AbstractJsonTypeHandler<T> extends BaseTypeHandler<T> implements IJsonTypeHandler<T> {
 
-    protected final Logger log = LoggerFactory.getLogger(this.getClass());
+    protected final Log log = LogFactory.getLog(this.getClass());
 
     protected final Class<?> type;
 
@@ -63,6 +63,7 @@ public abstract class AbstractJsonTypeHandler<T> extends BaseTypeHandler<T> impl
      *
      * @param type  类型
      * @param field 字段
+     * @since 3.5.6
      */
     public AbstractJsonTypeHandler(Class<?> type, Field field) {
         this(type);

mybatis-plus-extension/src/main/java/com/baomidou/mybatisplus/extension/handlers/FastjsonTypeHandler.java

@@ -35,9 +35,6 @@ public class FastjsonTypeHandler extends AbstractJsonTypeHandler<Object> {
 
     public FastjsonTypeHandler(Class<?> type) {
         super(type);
-        if (log.isTraceEnabled()) {
-            log.trace("FastjsonTypeHandler(" + type + ")");
-        }
     }
 
     public FastjsonTypeHandler(Class<?> type, Field field) {

mybatis-plus-extension/src/main/java/com/baomidou/mybatisplus/extension/handlers/GsonTypeHandler.java

@@ -43,7 +43,6 @@ public class GsonTypeHandler extends AbstractJsonTypeHandler<Object> {
         super(type, field);
     }
 
-
     @Override
     public Object parse(String json) {
         return getGson().fromJson(json, this.getFieldType());
@@ -65,4 +64,5 @@ public class GsonTypeHandler extends AbstractJsonTypeHandler<Object> {
         Assert.notNull(gson, "Gson should not be null");
         GsonTypeHandler.GSON = gson;
     }
+
 }

mybatis-plus-extension/src/main/java/com/baomidou/mybatisplus/extension/handlers/JacksonTypeHandler.java

@@ -16,13 +16,15 @@
 package com.baomidou.mybatisplus.extension.handlers;
 
 import com.baomidou.mybatisplus.core.toolkit.Assert;
+import com.fasterxml.jackson.core.JacksonException;
 import com.fasterxml.jackson.core.JsonProcessingException;
+import com.fasterxml.jackson.databind.JavaType;
 import com.fasterxml.jackson.databind.ObjectMapper;
+import com.fasterxml.jackson.databind.type.TypeFactory;
 import org.apache.ibatis.type.JdbcType;
 import org.apache.ibatis.type.MappedJdbcTypes;
 import org.apache.ibatis.type.MappedTypes;
 
-import java.io.IOException;
 import java.lang.reflect.Field;
 
 /**
@@ -45,12 +47,15 @@ public class JacksonTypeHandler extends AbstractJsonTypeHandler<Object> {
         super(type, field);
     }
 
-
     @Override
     public Object parse(String json) {
+        ObjectMapper objectMapper = getObjectMapper();
+        TypeFactory typeFactory = objectMapper.getTypeFactory();
+        JavaType javaType = typeFactory.constructType(getFieldType());
         try {
-            return getObjectMapper().readValue(json, getObjectMapper().getTypeFactory().constructType(getFieldType()));
-        } catch (IOException e) {
+            return objectMapper.readValue(json, javaType);
+        } catch (JacksonException e) {
+            log.error("deserialize json: " + json + " to " + javaType + " error ", e);
             throw new RuntimeException(e);
         }
     }
@@ -60,6 +65,7 @@ public class JacksonTypeHandler extends AbstractJsonTypeHandler<Object> {
         try {
             return getObjectMapper().writeValueAsString(obj);
         } catch (JsonProcessingException e) {
+            log.error("serialize " + obj + " to json error ", e);
             throw new RuntimeException(e);
         }
     }
@@ -75,4 +81,5 @@ public class JacksonTypeHandler extends AbstractJsonTypeHandler<Object> {
         Assert.notNull(objectMapper, "ObjectMapper should not be null");
         JacksonTypeHandler.OBJECT_MAPPER = objectMapper;
     }
+
 }