1添加依賴

<!-- Jackson Json處理工具包 -->
            <dependency>
              <groupId>org.codehaus.jackson</groupId>
              <artifactId>jackson-mapper-asl</artifactId>
              <version>${jackson.version}</version>
          </dependency>
          <dependency>
              <groupId>com.fasterxml.jackson.core</groupId>
             <artifactId>jackson-core</artifactId>
             <version>${jackson.core.version}</version>
         </dependency>
        <dependency>
                <groupId>com.fasterxml.jackson.core</groupId>
                <artifactId>jackson-databind</artifactId>
                <version>${jackson.core.version}</version>
            </dependency>

<properties>
         <jackson.version>1.9.13</jackson.version>
         <jackson.core.version>2.4.2</jackson.core.version>
 </properties>

2.在實體類的getter方法上面添加@JsonFormat(pattern="yyyy-MM-dd HH:mm:ss"）

再次嘗試 就會有效果了