返回Json时格式化日期Date
第一步:创建CustomObjectMapper类
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/** * 解决SpringMVC使用@ResponseBody返回json时,日期格式默认显示为时间戳的问题。需配合<mvc:message-converters>使用 */ @Component ( "customObjectMapper" ) public class CustomObjectMapper extends ObjectMapper { public CustomObjectMapper() { CustomSerializerFactory factory = new CustomSerializerFactory(); factory.addGenericMapping(Date. class , new JsonSerializer<Date>() { @Override public void serialize(Date value, JsonGenerator jsonGenerator, SerializerProvider provider) throws IOException, JsonProcessingException { SimpleDateFormat sdf = new SimpleDateFormat( "yyyy-MM-dd HH:mm:ss" ); jsonGenerator.writeString(sdf.format(value)); } }); this .setSerializerFactory(factory); } } |
第二步:配置如下:
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< mvc:annotation-driven > < mvc:message-converters > < bean class = "org.springframework.http.converter.json.MappingJacksonHttpMessageConverter" > < property name = "objectMapper" ref = "customObjectMapper" ></ property > </ bean > </ mvc:message-converters > </ mvc:annotation-driven > |
效果如下:
格式化前
格式化后
进阶:返回自定义格式日期
使用@ResponseBody时返回json字符串的日期格式。Date类型属性默认返回一个Long型的时间戳,怎样能够返回自定义的日期格式?
解决方案:目前有两种方式实现,
1、局部修改(网上较多,但不推荐);
继承Jackson的抽象类:JsonSerializer<T>,然后在javabean的属性getter()上添加注解@JsonSerialize即可实现。
代码如下:
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import java.io.IOException; import java.text.SimpleDateFormat; import java.util.Date; import org.codehaus.jackson.JsonGenerator; import org.codehaus.jackson.JsonProcessingException; import org.codehaus.jackson.map.JsonSerializer; import org.codehaus.jackson.map.SerializerProvider; /** * @description 自定义返回JSON 数据格中日期格式化处理 */ public class CustomDateSerializer extends JsonSerializer<Date> { @Override public void serialize(Date value, JsonGenerator jsonGenerator, SerializerProvider provider) throws IOException, JsonProcessingException { SimpleDateFormat sdf = new SimpleDateFormat( "yyyy-MM-dd HH:mm:ss" ); jsonGenerator.writeString(sdf.format(value)); } } |
使用方式:
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@JsonSerialize (using = CustomDateSerializer. class ) public Date getCreateDate() { return createDate; } |
2、全局修改(强烈推荐):
MappingJacksonHttpMessageConverter主要通过ObjectMapper来实现返回json字符串。这里我们继承该类,注册一个JsonSerializer<T>。然后在配置文件中注入自定义的ObjectMapper。
代码如下:
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import java.io.IOException; import java.text.SimpleDateFormat; import java.util.Date; import org.codehaus.jackson.JsonGenerator; import org.codehaus.jackson.JsonProcessingException; import org.codehaus.jackson.map.JsonSerializer; import org.codehaus.jackson.map.ObjectMapper; import org.codehaus.jackson.map.SerializerProvider; import org.codehaus.jackson.map.ser.CustomSerializerFactory; /** * @description 解决Date类型返回json格式为自定义格式 */ public class CustomObjectMapper extends ObjectMapper { public CustomObjectMapper(){ CustomSerializerFactory factory = new CustomSerializerFactory(); factory.addGenericMapping(Date. class , new JsonSerializer<Date>(){ @Override public void serialize(Date value, JsonGenerator jsonGenerator, SerializerProvider provider) throws IOException, JsonProcessingException { SimpleDateFormat sdf = new SimpleDateFormat( "yyyy-MM-dd HH:mm:ss" ); jsonGenerator.writeString(sdf.format(value)); } }); this .setSerializerFactory(factory); } } |
spring-servlet.xml中配置:
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< mvc:annotation-driven > < mvc:message-converters > < bean class = "org.springframework.http.converter.json.MappingJacksonHttpMessageConverter" > < property name = "objectMapper" ref = "customObjectMapper" ></ property > </ bean > </ mvc:message-converters > </ mvc:annotation-driven > < bean id = "customObjectMapper" class = "com.pmc.dwa.common.custom.CustomObjectMapper" ></ bean > |