springmvc java对象无法返回json格式问题

话不多说,三部:

一、在pom.xml引入jakcson

                <dependency>
			<groupId>com.fasterxml.jackson.core</groupId>
			<artifactId>jackson-core</artifactId>
			<version>2.9.7</version>
		</dependency>
		<dependency>
			<groupId>com.fasterxml.jackson.core</groupId>
			<artifactId>jackson-databind</artifactId>
			<version>2.9.7</version>
		</dependency>
		<dependency>
			<groupId>com.fasterxml.jackson.core</groupId>
			<artifactId>jackson-annotations</artifactId>
			<version>2.9.7</version>
		</dependency>

注意springmvc的版本,我这边用的是<spring-version>4.3.4.RELEASE</spring-version>

二、在spring的配置文件添加如下注解

<mvc:annotation-driven>
<!-- <mvc:message-converters>
<bean class="org.springframework.http.converter.StringHttpMessageConverter"></bean>
<bean class="org.springframework.http.converter.json.MappingJackson2HttpMessageConverter"></bean>
</mvc:message-converters> -->
</mvc:annotation-driven>

三、在controller请求头上添加@ResponseBody

	@RequestMapping(value="get/{id}",method=RequestMethod.GET)
	@ResponseBody
	public Area getAreaById(@PathVariable("id") Long id) {
		Area area = dao.queryAreaById(id);
		return area;
	}

这样java对象就能返回json格式数据了.

java对象可以是实体类,集合类等等