方式一:使用JSON工具将对象序列化成json,常用工具Jackson,fastjson,gson
利用HttpServletResponse,然后获取response.getOutputStream()或response.getWriter(),直接输出。
如下:
这种方式最为直接,但是在既然已经用了SpingMVC框架的情况下,再用这种方式,有点不合时宜,out啦。
方式二:非注解形式,配置JsonView视图
[html] view plain copy print ? <?xml version="1.0" encoding="UTF-8" standalone="no"?> <beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:context="http://www.springframework.org/schema/context" xmlns:mvc="http://www.springframework.org/schema/mvc" xsi:schemaLocation=" http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc.xsd"> <!-- 视图解析器 --> <bean id="viewResolver" class="org.springframework.web.servlet.view.ContentNegotiatingViewResolver"> <property name="mediaTypes"> <map> <entry key="html" value="text/html" /> <entry key="json" value="application/json" /> <entry key="xml" value="application/xml" /> </map> </property> <property name="viewResolvers"> <list> <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver"> <property name="prefix" value="/WEB-INF/views/" /> <property name="suffix" value=".jsp" /> </bean> </list> </property> <property name="defaultViews"> <list> <!-- 不加配置返回 {"account":{"username":"admin","password":"123456"}} --> <!-- 加配置返回 {"username":"admin","password":"123456"}--> <bean class="org.springframework.web.servlet.view.json.MappingJackson2JsonView"> <property name="extractValueFromSingleKeyModel" value="true" /> </bean> <bean class="org.springframework.web.servlet.view.xml.MarshallingView"> <property name="marshaller"> <bean class="org.springframework.oxm.xstream.XStreamMarshaller"/> </property> </bean> </list> </property> </bean> </beans>
那么我们的访问方式应该为:http://localhost:8080/SpringMVC/account/viewResolver.json
如果我们想以xml的形式返回,当然还要配xml视图,那相应的访问路劲为:http://localhost:8080/SpringMVC/account/viewResolver.xml
方式三:注解形式
[html] view plain copy print ? <?xml version="1.0" encoding="UTF-8" standalone="no"?> <beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:context="http://www.springframework.org/schema/context" xmlns:mvc="http://www.springframework.org/schema/mvc" xsi:schemaLocation=" http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc.xsd"> <!-- 启动注解驱动的Spring MVC功能,注册请求url和注解POJO类方法的映射--> <mvc:annotation-driven /> <!-- use-default-filters="false" 只扫描指定的注解 --> <context:component-scan base-package="com.somnus.controller" use-default-filters="false"> <context:include-filter type="annotation" expression="org.springframework.stereotype.Controller"/> </context:component-scan> <!-- 视图解析器 --> <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver"> <property name="viewClass" value="org.springframework.web.servlet.view.JstlView"/> <property name="contentType" value="text/html"/> <property name="prefix" value="/WEB-INF/views/"/> <property name="suffix" value=".jsp"/> </bean> </beans>
由于配置了<mvc:annotation-driven />,SpringMVC会帮我们做很多事情,那也意味着需要我们自己来配置的越来越少,至于做了哪些事情可以看我的这篇博文《 SpringMVC 解读——<mvc:annotation-driven/>》。
是不是使用方式越来越简单了呢,程序员越来越傻,不知道是好事,还是坏事……