SpringMVC 使用注解配置基本使用(2)
主要是针对配置(1)进行优化:
SpringMVC xlm可左如下配置，从Spring3.0开始，可以用<mvc:annotation-driven/>标签，代替AnnotationHandlerMapping和MethodHandlerAdapter两个bean,Spring3.0后对其进行了封装，自动注入，省得麻烦每次自己手写一遍，因为这两个类每次都需要用到，一个是用来映射请求对应的Controller，一个是映射Controller里对应的方法。

<?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"xmlns:aop="http://www.springframework.org/schema/aop" xmlns:tx="http://www.springframework.org/schema/tx"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-3.0.xsd            http://www.springframework.org/schema/aop             http://www.springframework.org/schema/aop/spring-aop-3.0.xsd            http://www.springframework.org/schema/tx             http://www.springframework.org/schema/tx/spring-tx-3.0.xsd            http://www.springframework.org/schema/mvc             http://www.springframework.org/schema/mvc/spring-mvc-3.0.xsd            http://www.springframework.org/schema/context             http://www.springframework.org/schema/context/spring-context-3.0.xsd">            <!-- 扫描该包下所有的类 --> <context:component-scan base-package="test"></context:component-scan> <!-- spring3.0开始，可用以下方式直接替代下面两个bean，因为每次都需要用到HandlderMapping和MethodHandlerAdapter这两个类，spring干脆把它们封装起来--> <mvc:annotation-driven/> <!-- handleMapping类，用于对发来的请求映射到对应的Controller --> <!-- <bean id="handleMapping" mapping="/imp/**"/> <bean value="/WEB-INF/jsp/"></property> <property name="suffix" value=".jsp"></property></bean></beans>

以下是对Controller注解进行优化，通过在RequestMapping加上“/User”，则可以统一为下面方法加上一个识别根目录，用以区分处理不同业务逻辑的相同方法，不需要再想以前那样，在方法上面一个个加上"/User/addUser"这样;

package test;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;import org.springframework.stereotype.Controller;import org.springframework.web.bind.annotation.RequestMapping;import org.springframework.web.bind.annotation.RequestMethod;import org.springframework.web.servlet.ModelAndView;import org.springframework.web.servlet.mvc.AbstractController;@Controller@RequestMapping(value="/User")public class MyAnnotationController {    //假如 RequestMapping不写value，默认输入的是value值,@RequestMapping("/addUser")// 注解方式不需要输入HttpServletRequest和HttpServletResponse这两个参数public String addUser() {System.out.println("addUser--------");String result = "addUser";// 跳转到annotation.jspreturn "annotation";}/* * @RequestMapping(value="/User/addUser",method=RequestMethod.GET) * //注解方式不需要输入HttpServletRequest和HttpServletResponse这两个参数 public * ModelAndView addUser(){ System.out.println("addUser--------"); String * result = "addUser"; //跳转到annotation.jsp return new * ModelAndView("annotation","result",result); } */}

如果需要再JSP页面输出result的值，则可以在方法传入HttpServletRequest实例，用我们最原始的方式，放到request域中

package test;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;import org.springframework.stereotype.Controller;import org.springframework.web.bind.annotation.RequestMapping;import org.springframework.web.bind.annotation.RequestMethod;import org.springframework.web.servlet.ModelAndView;import org.springframework.web.servlet.mvc.AbstractController;@Controller@RequestMapping(value="/User")public class MyAnnotationController {    //假如 RequestMapping不写value，默认输入的是value值,@RequestMapping("/addUser")// 注解方式不需要输入HttpServletRequest和HttpServletResponse这两个参数public String addUser(HttpServletRequest request) {System.out.println("addUser--------");String result = "addUser";request.setAttribute("result", result);// 跳转到annotation.jspreturn "annotation";}/* * @RequestMapping(value="/User/addUser",method=RequestMethod.GET) * //注解方式不需要输入HttpServletRequest和HttpServletResponse这两个参数 public * ModelAndView addUser(){ System.out.println("addUser--------"); String * result = "addUser"; //跳转到annotation.jsp return new * ModelAndView("annotation","result",result); } */}