从零学习SpringMvc

 简单介绍下SpringMVC构成

构成SpringMVC的主要组件如下

1、DispatcherServlet

2、HandlerMapping

3、Controller

4、ViewResolver

 

了解SpringMVC的构成之后说下SpringMvc的处理流程顺便说下每部分都负责做什么

spring mvc处理过程
1、客户端请求提交到DispatcherServlet
2、DispatcherServlet查询一个或多个HandlerMapping，找到处理请求的Controller
3、DispatcherServlet将请求提交到Controller
4、Controller调用业务逻辑处理后，返回ModelAndView对象
5、DispatcherServlet查询一个或多个ViewResolver视图解析器，找到ModelAndView指定的视图
6、视图负责将结果展示给客户端

 

用实例来说明SpringMVC的开发步骤

1、新建web project
2、添加spring支持
3、修改web.xml，配置DispatcherServlet
4、实现Model层
5、实现Controller
6、实现View层
7、修改applicationContext.xml

 

实际操作步骤
1、打开myeclipse创建web project
2、创建好工程后构建路径添加所需jar
工程上点击鼠标右键--选择myeclipse--选择Add Spring Capabilities
--勾选MyEclipse Libraries--勾选spring3.0核心包（Spring 3.0 Core Libraries）由于是spring mvc项目 勾选Spring 3.0 Web Libraries

3、点击确定，工程建立完毕

4、修改web.xml

添加 DispatcherServlet 如：

Dispatcher
org.springframework.web.servlet.DispatcherServlet

配置DispatcherServlet用来对整个请求进行处理同时配置spring所需配置文件

配置参数

namespace
springmvc-servlet

 

注：

 

1

 

接下来配置springmvc拦截请求

Dispatcher
*.do

表示处理所有以“/”结尾的请求

 

整个web.xml如下：

 

xmlns="http://java.sun.com/xml/ns/javaee"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://java.sun.com/xml/ns/javaee
http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd">


Dispatcher
org.springframework.web.servlet.DispatcherServlet
1

contextConfigLocation
classpath:applicationContext.xml



Dispatcher
*.do


index.jsp

 

接下来开发model如下：

package com.sinosig.model;

public class Account {
private String cardNo;
private String password;
private float balance;
public String getCardNo() {
return cardNo;
}
public void setCardNo(String cardNo) {
this.cardNo = cardNo;
}
public String getPassword() {
return password;
}
public void setPassword(String password) {
this.password = password;
}
public float getBalance() {
return balance;
}
public void setBalance(float balance) {
this.balance = balance;
}

}

下一步：

开发controller

新建LoginController 继承AbstractController 相关业务逻辑在此Controller中进行封装

如：

package com.sinosig.web.controller;

import java.util.HashMap;
import java.util.Map;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.springframework.web.servlet.ModelAndView;
import org.springframework.web.servlet.mvc.AbstractController;

import com.sinosig.model.Account;

public class LoginController extends AbstractController {
private String formView;
private String successVies;
public String getFormView() {
return formView;
}

public void setFormView(String formView) {
this.formView = formView;
}

public String getSuccessVies() {
return successVies;
}

public void setSuccessVies(String successVies) {
this.successVies = successVies;
}

@Override
protected ModelAndView handleRequestInternal(HttpServletRequest request,
HttpServletResponse response) throws Exception {
// 获取账户和密码
String cardNo = request.getParameter("cardNo");
String password = request.getParameter("password");
Account account = getAccount(cardNo, password);
Map model = new HashMap();
if (account != null) {
model.put("account", account);
return new ModelAndView(getSuccessVies(), model);
} else {
model.put("error", "卡号和密码不正确");
return new ModelAndView(getFormView(), model);
}
}

public Account getAccount(String cardNo, String password){
if (cardNo.equals("123") && password.equals("123")) {
Account account = new Account();
account.setCardNo(cardNo);
account.setBalance(88.8f);
return account;
} else {
return null;
}
}
}

 

开发login.jsp

<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>

${error }

账户登录
卡号:
密码:

 

showAccount.jsp

如：

<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>

账户信息：

卡号：${account.cardNo }
密码：${account.password }

修改applicationContext.xml

 

如：

xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:p="http://www.springframework.org/schema/p"
xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-2.5.xsd">









loginController

 

上述实例完成，如有问题请及时联系

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