SpingMvc 注解的使用

1、使用注解减少配置xml文件

2、注解可以降低耦合度

3、使用注解编写的普通类

import javax.servlet.http.HttpServletRequest;

import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;

//说明springMvc controller 类
@Controller
public class testAction {

    //设置请求路径
    //返回值需要使用HttpServletRequest  这个有点不爽
    @RequestMapping("/test")
    public String test(HttpServletRequest request) {
        request.setAttribute("test", "你妹");
        return "/test";
    }
}

4、spring 配置文件简单配置

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans" xmlns:context="http://www.springframework.org/schema/context" xmlns:p="http://www.springframework.org/schema/p"
    xmlns:mvc="http://www.springframework.org/schema/mvc" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://www.springframework.org/schema/beans  
      http://www.springframework.org/schema/beans/spring-beans-3.0.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-3.0.xsd">
    <!-- 注解扫描包 也就是指定controller 所在的包-->
    <context:component-scan base-package="com.ly.action" />



    <!-- 开启注解 -->
    <mvc:annotation-driven />


   <!-- 指明前缀和后缀 -->
    <bean id="viewResolver" class="org.springframework.web.servlet.view.InternalResourceViewResolver">
        <property name="prefix" value="/"></property>
        <property name="suffix" value=".jsp"></property>
    </bean>
</beans>