工具： idea 2016.2.1 没有mevan构建，直接引用jar包， spring MVC 4.3.1和 jackson2.5 (jackson-annotations-2.5.0.jar 、jackson-core-2.5.0.jar、jackson-databind-2.5.0.jar)， 用的tomcat8.5
java文件：
@Controller
public class UserController {
@RequestMapping(value="/user", method= RequestMethod.GET)
public @ResponseBody User hello() throws IOException {
User user = new User();
user.setName("test");
user.setPassword("123");
return user;
}
}
spring配置文件
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:mvc="http://www.springframework.org/schema/mvc"
xmlns:p="http://www.springframework.org/schema/p" xmlns:context="http://www.springframework.org/schema/context"
xsi:schemaLocation="
http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd">
<context:annotation-config />
<context:component-scan base-package="com.test" />
<bean id = "User" class="com.test.User"></bean>
<bean class="org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter"></bean>
<bean class="org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerMapping"></bean>
<!-- ViewResolver -->
<bean id="viewResolver" class="org.springframework.web.servlet.view.InternalResourceViewResolver">
<property name="prefix" value="/WEB-INF/jsp"/>
<property name="suffix" value=".jsp"/>
</bean>
</beans>
