springmvc java對象無法返回json格式問題

話不多說,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,我這邊用的是<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請求頭上添加@ResponseBody

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

這樣java對象就能返回json格式數據了.

java對象可以是實體類,集合類等等