SpringMVC--使用fastjson配置详解

Love The Way You Lie 2021-08-13 22:26 561阅读 0赞

#### fastjson配置详解 ####

**引入依赖**  
pom.xml

<dependency>
          <groupId>com.alibaba</groupId>
          <artifactId>fastjson</artifactId>
          <version>1.2.8</version>
        </dependency>

**与SpringMVC整合配置：**  
springmvc.xml

<mvc:annotation-driven>
    	<mvc:message-converters register-defaults="true">
    		
    		<bean id="stringHttpMessageConverter" class="org.springframework.http.converter.StringHttpMessageConverter">
    			<constructor-arg value="UTF-8" index="0"/>
    		</bean>
    		
    		<bean class="com.alibaba.fastjson.support.spring.FastJsonHttpMessageConverter">
    			<property name="charset" value="UTF-8" />
    			<property name="supportedMediaTypes">
    				<list>
    					<value>application/json</value>
    					<value>text/html;charset=UTF-8</value>
    				</list>
    			</property>
    			<property name="features">
    				<list>
    					<value>QuoteFieldNames</value>
    					<value>WriteMapNullValue</value>
    					<value>WriteDateUseDateFormat</value>
    					<value>WriteEnumUsingToString</value>
    					<value>DisableCircularReferenceDetect</value>
    				</list>
    			</property>
    		</bean>
    	</mvc:message-converters>
    </mvc:annotation-driven>

**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
 *  **WriteDateUseDateFormat** Date的日期转换器
 *  **DisableCircularReferenceDetect** 解决FastJson循环引用的问题避免出现\{" r e f " : " ref":" ref":".rows\[0\].user"\}

#### 测试 ####

页面：index.jsp

<%@ page contentType="text/html;charset=UTF-8" language="java" %>
    <html>
    <head>
        <script type="text/javascript" src="js/jquery-2.1.0.js"></script>
        <script type="text/javascript"> function getUserJson() { var url = "user/returnJson"; var args = { }; $.post(url, args, function (data) { alert(data); }); } </script>
    </head>
    <body>
        <a href="javascript:void(0)" id="returnJson" onclick="getUserJson()">Test Json</a><br>
    </body>
    </html>

**UserController**

//返回JSON
        @RequestMapping("/returnJson")
        @ResponseBody
        public Collection<User> returnJson(){ 
            Map<Integer, User> us = new HashMap<Integer, User>();
            us.put(1, new User("lisi", "123456", new Address("江苏", "扬州")));
            us.put(2, new User("lisi", "123456", new Address("江苏", "扬州")));
            us.put(3, new User("lisi", "123456", new Address("江苏", "扬州")));
            return  us.values();
        }

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