Jackson將對象轉換為json字符串時，設置默認的時間格式

maven需要的依賴：

<dependency>
    <groupId>com.fasterxml.jackson.core</groupId>
    <artifactId>jackson-databind</artifactId>
</dependency>

具體代碼

ObjectMapper mapper = new ObjectMapper();
DateFormat dateformat= new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
mapper.setDateFormat(dateformat);//設置時間格式
mapper.setSerializationInclusion(Include.NON_NULL); //序列化時忽略null
//content是Object對象
String str = mapper.writeValueAsString(content);