Spring mvc 返回json格式

第一次使用spring mvc ，在此也算是记录一下以防忘记，希望有经验的朋友指出不足的地方

一、使用maven管理jar。

<dependency>
    <groupId>org.codehaus.jackson</groupId>
    <artifactId>jackson-core-lgpl</artifactId>
    <version>1.9.6</version>
</dependency>
<dependency>
    <groupId>org.codehaus.jackson</groupId>
    <artifactId>jackson-core-asl</artifactId>
    <version>1.9.4</version>
</dependency>
<dependency>
    <groupId>org.codehaus.jackson</groupId>
    <artifactId>jackson-mapper-asl</artifactId>
    <version>1.9.5</version>
</dependency>
<dependency>
    <groupId>org.codehaus.jackson</groupId>
    <artifactId>jackson-mapper-lgpl</artifactId>
    <version>1.9.6</version>
</dependency>

<dependency>
	<groupId>org.codehaus.jackson</groupId>
	<artifactId>jackson-core-lgpl</artifactId>
	<version>1.9.6</version>
</dependency>
<dependency>
	<groupId>org.codehaus.jackson</groupId>
	<artifactId>jackson-core-asl</artifactId>
	<version>1.9.4</version>
</dependency>
<dependency>
	<groupId>org.codehaus.jackson</groupId>
	<artifactId>jackson-mapper-asl</artifactId>
	<version>1.9.5</version>
</dependency>
<dependency>
	<groupId>org.codehaus.jackson</groupId>
	<artifactId>jackson-mapper-lgpl</artifactId>
	<version>1.9.6</version>
</dependency>

二、配置spring-servlet.xml:

<bean class="org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter">
        <property name="messageConverters">
            <list >
                <ref bean="mappingJacksonHttpMessageConverter" />
            </list>
        </property>
    </bean>

<bean class="org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter">    
		<property name="messageConverters">    
			<list >    
				<ref bean="mappingJacksonHttpMessageConverter" />    
			</list>    
		</property>    
	</bean>

mappingJacksonHttpMessageConverter ： 用来处理json格式转换

<bean id="mappingJacksonHttpMessageConverter" class="org.springframework.http.converter.json.MappingJacksonHttpMessageConverter">
    <property name="supportedMediaTypes">
        <list>
            <value>application/json;charset=UTF-8</value>
       </list>
    </property>
</bean>

<bean id="mappingJacksonHttpMessageConverter" class="org.springframework.http.converter.json.MappingJacksonHttpMessageConverter">  
    <property name="supportedMediaTypes">  
        <list>  
            <value>application/json;charset=UTF-8</value>  
       </list>  
    </property>
</bean>

1、

如果 mappingJacksonHttpMessageConverter 可以 直接写成如下：

<bean id="mappingJacksonHttpMessageConverter" class="org.springframework.http.converter.json.MappingJacksonHttpMessageConverter" />

<bean id="mappingJacksonHttpMessageConverter" class="org.springframework.http.converter.json.MappingJacksonHttpMessageConverter" />  

这样默认应该是 ：ISO-88859-1

2、

supportedMediaTypes 的 list 里面 可以写多个value

<list>

<value>apolication/json; charset=UTF-8</value>

<value>text/html;charset=UTF-8</value>

</list>

三、controller 配置@ResponseBody

@Controller
public class LoginController {
    @RequestMapping(value="/validataUser.json")
    @ResponseBody
    public Map<String,Object> validataUser(@RequestParam String userName){
        logger.info(" validata user : {}",userName);
        Map<String,Object> map = new HashMap<String,Object>();
        map.put("code", true);
        return map;
    }
}

@Controller
public class LoginController {
	@RequestMapping(value="/validataUser.json")
	@ResponseBody
	public Map<String,Object> validataUser(@RequestParam String userName){
		logger.info(" validata user : {}",userName);
		Map<String,Object> map = new HashMap<String,Object>();
		map.put("code", true);
		return map;
	}
}

四：页面上仍然按照原来的ajax区json的格式一样、

题外话：

关于 @ResponseBody：

将内容或对象作为 HTTP 响应正文返回，使用@ResponseBody将会跳过视图处理部分，而是调用适合HttpMessageConverter，将返回值写入输出流。

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