解决方法一:
1、导入jackson-core-2.5.1.jar和jackson-databind-2.5.1.jar
2、Spring配置文件添加:
1 spring3为:org.springframework.http.converter.json.MappingJacksonHttpMessageConverter 2 spring4为:org.springframework.http.converter.json.MappingJackson2HttpMessageConverter 3 4 5 <bean id="mappingJacksonHttpMessageConverter" class="org.springframework.http.converter.json.MappingJacksonHttpMessageConverter"> 6 <property name="supportedMediaTypes"> 7 <list> 8 <value>text/html;charset=UTF-8</value> 9 </list> 10 </property> 11 </bean> 12 13 <!-- 启动Spring MVC的注解功能,完成请求和注解POJO的映射 --> 14 <bean class="org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter"> 15 <property name="messageConverters"> 16 <list> 17 <ref bean="mappingJacksonHttpMessageConverter" /><!-- json转换器 这里可以直接转换成json数据--> 18 </list> 19 </property> 20 </bean>
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1 <bean id="stringConverter" class="org.springframework.http.converter.StringHttpMessageConverter"> 2 <property name="supportedMediaTypes"> 3 <list> 4 <value>text/html; charset=UTF-8</value> 5 </list> 6 </property> 7 </bean> 8 <bean id="jsonConverter" class="org.springframework.http.converter.json.MappingJacksonHttpMessageConverter"></bean> 9 <bean class="org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter"> 10 <property name="messageConverters"> 11 <list> 12 <ref bean="stringConverter"/> 13 <ref bean="jsonConverter"/><!-- 这里出来的object--> 14 </list> 15 </property> 16 </bean>
虚线下面和上面的区别在于有没有加StringHttpMessageConverter以及有没有为MappingJacksonHttpMessageConverter加上property 属性,不加property 属性的话,页面不会显示undefined,会显示对象属性的值。
解决方法二:
1、导入第三方(阿里巴巴)的fastjson包,fastjson-1.2.7.jar
2、Spring配置文件添加:
1 <mvc:annotation-driven> 2 <mvc:message-converters register-defaults="true"> 3 <!-- 避免IE执行AJAX时,返回JSON出现下载文件 --> 4 <bean id="fastJsonHttpMessageConverter" class="com.alibaba.fastjson.support.spring.FastJsonHttpMessageConverter"> 5 <property name="supportedMediaTypes"> 6 <list> 7 <value>application/json;charset=UTF-8</value> 8 </list> 9 </property> 10 </bean> 11 </mvc:message-converters> 12 </mvc:annotation-driven>