SpringMVC--配置FastJSON为JSON处理器

偏执的太偏执、 2022-06-08 23:09 309阅读 0赞

springMVC使用fastJson很简单，在springMVC的配置文件中作如下配置：

<mvc:annotation-driven>
            <mvc:message-converters register-defaults="true">
                
                <bean class="com.alibaba.fastjson.support.spring.FastJsonHttpMessageConverter">
                    <property name="supportedMediaTypes">
                        <list>
                            <value>text/html;charset=UTF-8</value>
                            <value>application/json</value>
                        </list>
                    </property>
                    <property name="features">
                        <list>
                            <value>WriteMapNullValue</value>
                            <value>QuoteFieldNames</value>
                        </list>
                    </property>
                </bean>
            </mvc:message-converters>
        </mvc:annotation-driven>

或者通过注解直接注入FastJsonHttpMessageConverter，通过@Bean注入HandlerAdapter来注入FastJsonHttpMessageConverter，有关HttpMessageConverter相关的知识可以参考 [springMVC源码分析--HttpMessageConverter写write操作（三）][springMVC_--HttpMessageConverter_write]和 [springMVC源码分析--HttpMessageConverter参数read操作（二）][springMVC_--HttpMessageConverter_read]

@Configuration
    public class FastJSONMessageConverter {
    	
    	@Bean
    	public HandlerAdapter handlerAdapter(WebBindingInitializer webBindingInitializer){
    		
    		List<HttpMessageConverter<?>> messageConverters = new ArrayList<HttpMessageConverter<?>>();
    		//注入FastJSON
    		FastJsonHttpMessageConverter fastJsonHttpMessageConverter = new FastJsonHttpMessageConverter();
    		List<MediaType> supportedMediaTypes = new ArrayList<MediaType>();
    		supportedMediaTypes.add(MediaType.APPLICATION_JSON_UTF8);
    		supportedMediaTypes.add(MediaType.APPLICATION_FORM_URLENCODED);
    		supportedMediaTypes.add(MediaType.TEXT_HTML);
    		fastJsonHttpMessageConverter.setSupportedMediaTypes(supportedMediaTypes );
    		messageConverters.add(fastJsonHttpMessageConverter);
    		RequestMappingHandlerAdapter requestMappingHandlerAdapter = new RequestMappingHandlerAdapter();
    		//参数及返回值处理
    		requestMappingHandlerAdapter.setMessageConverters(messageConverters);
    		//参数校验
    		requestMappingHandlerAdapter.setWebBindingInitializer(webBindingInitializer);
    		return requestMappingHandlerAdapter;
    	}
    }

Fastjson的SerializerFeature序列化属性：   
QuoteFieldNames———-输出key时是否使用双引号,默认为true   
WriteMapNullValue——–是否输出值为null的字段,默认为false   
WriteNullNumberAsZero—-数值字段如果为null,输出为0,而非null   
WriteNullListAsEmpty—–List字段如果为null,输出为\[\],而非null   
WriteNullStringAsEmpty—字符类型字段如果为null,输出为”“,而非null   
WriteNullBooleanAsFalse–Boolean字段如果为null,输出为false,而非null  
别忘了添加Fastjson的包，如果使用Maven，版本可以切换至最新版本，可使用如下设置

<dependency>
        <groupId>com.alibaba</groupId>
        <artifactId>fastjson</artifactId>
        <version>1.2.37</version>
    </dependency>

示例：

@Controller
    @RequestMapping("/test")
    public class TestController {
    
    	@RequestMapping("/json")
    	@ResponseBody
    	public List<String> test(){
    		List<String> list = new ArrayList<String>();
    		list.add("1");
    		list.add("2");
    		list.add("sdsd");
    		list.add("asdads");
    		return list;
    	}
    }

浏览器输出：

\["1","2","sdsd","asdads"\]

[springMVC_--HttpMessageConverter_write]: http://blog.csdn.net/qq924862077/article/details/55271959
[springMVC_--HttpMessageConverter_read]: http://blog.csdn.net/qq924862077/article/details/55271569