一、注册组件扫描器
这里说的组件即处理器,需要指定处理器所在的基本包。
<?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:context="http://www.springframework.org/schema/context"
xmlns:aop="http://www.springframework.org/schema/aop"
xmlns:tx="http://www.springframework.org/schema/tx"
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/aop
http://www.springframework.org/schema/aop/spring-aop.xsd
http://www.springframework.org/schema/tx
http://www.springframework.org/schema/tx/spring-tx.xsd
http://www.springframework.org/schema/mvc
http://www.springframework.org/schema/mvc/spring-mvc.xsd">
<!-- 注册组件扫描器 -->
<context:component-scan base-package="cn.wechatbao.controller"></context:component-scan>
</beans>
二、第一个注解式Demo
1:Controller
package cn.wechatbao.controller;
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.servlet.ModelAndView;
@Controller
public class MyController {
@RequestMapping("/my.do")
public ModelAndView first(HttpServletRequest request,
HttpServletResponse response) throws Exception {
ModelAndView mv = new ModelAndView();
mv.addObject("message", "第一个注解式开发程序");
mv.setViewName("/WEB-INF/jsp/welcome.jsp");
return new ModelAndView("");
}
}
2:JSP页面(welcome.jsp)
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<title>SpringMVC1</title>
</head>
<body>
${message }
</body>
</html>
3:完整的项目结构
三、命名空间的配置
一般情况下,我们开发时,一个Controller类就是一个模块,而里面的所有处理器方法就是该模块的不同业务功能。这个时候,我们Controller与Controller之间就要用路径来区分开来。以表示不同的业务模块。这个时候,只需要在类上再加上@RequestMapping("/test")注解就OK了。
完整的类如下:
package cn.wechatbao.controller;
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.servlet.ModelAndView;
@Controller
@RequestMapping("/test")
public class MyController {
@RequestMapping("/first.do")
public ModelAndView first(HttpServletRequest request,
HttpServletResponse response) throws Exception {
ModelAndView mv = new ModelAndView();
mv.addObject("message", "第一个注解式开发程序方法一");
mv.setViewName("/WEB-INF/jsp/welcome.jsp");
return mv;
}
@RequestMapping("/second.do")
public ModelAndView second(HttpServletRequest request,
HttpServletResponse response) throws Exception {
ModelAndView mv = new ModelAndView();
mv.addObject("message", "第一个注解式开发程序方法二");
mv.setViewName("/WEB-INF/jsp/welcome.jsp");
return mv;
}
}
四、请求中通配符的使用
假设上面URL中usermanager是模块名(也就是我们说的命名空间),user-add.do和user-edit.do是具体的请求。但是添加和修改我们完全可以用一个处理器方法来解决。这个时候用通配符就简单多了。其实配置起来也特别简单,只需要在处理器方法上面的注解里加*就可以了。如下
@RequestMapping("/user-*.do")
public ModelAndView userAddOrUpdate(HttpServletRequest request,
HttpServletResponse response) throws Exception {
ModelAndView mv = new ModelAndView();
mv.addObject("message", "用户的添加或修改功能");
mv.setViewName("/WEB-INF/jsp/welcome.jsp");
return mv;
}