springMVC学习笔记之实战演练_springmvc从0到有实战演练-优快云博客

本文链接：https://blog.youkuaiyun.com/qq522935502/article/details/12492979

1.3实战演练

经过上述的分析，估计很多人都还是不太明白什么意思，包括自己也是似懂非懂，也怪自己的讲解水平有限，不过没关系，这个可以慢慢来，第一节中我们编写了一个简单的SpringMVC例子，现在我们再来写一个例子，算是练习一下吧，代码多写写也就会了。写完后，我们对案例中的配置内容进行详细的讲解。

1.3.1 用户注册案例

1.3.1.1编写视图JSP

我们要完成一个用户注册功能，所以我们的界面是一个form表单，用于提交用户的信息：

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%@ taglib uri="http://java.sun.com/jstl/core_rt" prefix="c"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
  <head>
    <base href="<%=basePath%>">
  </head>
  
  <body>
   	<form method="post" action="<c:url value='/user.html'/>">
   		<table>
   			<tr>
   				<td>用户名:</td>
   				<td><input type="text" name="userName"></td>
   			</tr>
   			<tr>
   				<td>密码:</td>
   				<td><input type="text" name="passWord"></td>
   			</tr>
   			<tr>
   				<td>真实姓名:</td>
   				<td><input type="text" name="realName"></td>
   			</tr>
   			<tr>
   				<td colspan="2"><input type="submit" name="提交"></td>
   			</tr>
   		</table>
   	</form>
  </body>
</html>

Form表单提交的是.html的请求，dispatcher会拦截，但它目前还不知道要转到哪，所以接下来我们需要做的是编写控制器。

1.3.1.2 编写控制器

package com.itcast.spring.mvc.action;

import org.springframework.beans.factory.annotation.Autowired;
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 com.itcast.spring.mvc.service.UserService;
import com.itcast.spring.mvc.service.model.User;

@Controller
@RequestMapping("/user")
public class UserController {
	@Autowired
	private UserService userService; //注入业务层的Bean
	
	/**处理'/user'的请求，不过请求的方法必须为POST*/
	@RequestMapping(method=RequestMethod.POST)
	public ModelAndView register(User user){ //将表单值映射到User对象中
		userService.createUser(user);
		ModelAndView mav = new ModelAndView();
		mav.setViewName("user/createSuccess");
		mav.addObject("user", user);
		return mav;
	}
}

这个控制器会接受到以user开头的url请求，然后做以下逻辑，调用userService的创建用户方法，创建ModelAndView对象，返回给结果视图，而spring的配置文件我们没有修改依旧是：

<?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: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-3.0.xsd
	   			http://www.springframework.org/schema/context   
        		http://www.springframework.org/schema/context/spring-context-3.0.xsd">

	<context:component-scan base-package="com.itcast.spring"></context:component-scan>
	<bean id="viewResolver"
		class="org.springframework.web.servlet.view.UrlBasedViewResolver">
		<property name="viewClass"
			value="org.springframework.web.servlet.view.JstlView">
		</property>
		<property name="prefix" value="/WEB-INF/jsp/"></property>
		<property name="suffix" value=".jsp"></property>
	</bean>

</beans>

1.3.1.3 添加业务对象

package com.itcast.spring.mvc.service.model;

public class User {	
	private String userName;
	private String passWord;
	private String realName;
	public String getUserName() {
		return userName;
	}
	public void setUserName(String userName) {
		this.userName = userName;
	}
	public String getPassWord() {
		return passWord;
	}
	public void setPassWord(String passWord) {
		this.passWord = passWord;
	}
	public String getRealName() {
		return realName;
	}
	public void setRealName(String realName) {
		this.realName = realName;
	}
}

package com.itcast.spring.mvc.service.impl;

import org.springframework.stereotype.Service;

import com.itcast.spring.mvc.service.UserService;
import com.itcast.spring.mvc.service.model.User;

@Service
public class UserServiceImpl implements UserService{
	public void createUser(User user) {
		System.out.println("注册用户:"+user.getUserName());
		System.out.println("注册密码:"+user.getPassWord());
		System.out.println("真实姓名:"+user.getRealName());
		
		user.setPassWord("密码已加密");
	}
}