SpringMVC 基础知识三
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2021-03-31 14:13:33
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第一：搭建SSM框架
1.1 环境准备
1.1.1 数据库和表结构
create database ssm;
create table account(
id int primary key auto_increment,
name varchar(100),
money double(7,2),
);1.1.2 创建Maven 工程
创建父工程(ssm)
创建关联的子模块
ssm-dao jar
ssm-service jar
ssm-domain jar
ssm-web war1.1.3 编写实体对象、业务层接口、持久层接口
实体对象:
package com.zzg.entity;
import java.io.Serializable;
@SuppressWarnings("serial")
public class Account implements Serializable {
private Integer id;
private String name;
private Float money;
public Integer getId() {
return id;
}
public void setId(Integer id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public Float getMoney() {
return money;
}
public void setMoney(Float money) {
this.money = money;
}
@Override
public String toString() {
return "Account [id=" + id + ", name=" + name + ", money=" + money + "]";
}
}
业务层接口：
package com.zzg.service;
import java.util.List;
import com.zzg.entity.Account;
public interface IAccountService {
/**
* 保存账户
* @param account
*/
void saveAccount(Account account);
/**
* 查询所有账户
* @return
*/
List<Account> findAllAccount();
}
持久层接口
package com.zzg.dao;
import java.util.List;
import com.zzg.entity.Account;
public interface IAccountDao {
/**
* 保存
* @param account
*/
void save(Account account);
/**
* 查询所有
* @return
*/
List<Account> findAll();
}
第二：SSM框架整合步骤
2.1 Web项目整合SpringMVC
2.1.1 在web.xml 文件中配置核心控制器(DispatcherServlet)
<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns="http://java.sun.com/xml/ns/javaee"
xsi:schemaLocation="http://java.sun.com/xml/ns/javaee
http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"
version="2.5">
<display-name>ssm_web</display-name>
<!-- 配置 spring mvc 的核心控制器 -->
<servlet>
<servlet-name>springmvcDispatcherServlet</servlet-name>
<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
<!-- 配置初始化参数，用于读取 springmvc 的配置文件 -->
<init-param>
<param-name>contextConfigLocation</param-name>
<param-value>classpath:springmvc.xml</param-value>
</init-param>
<!-- 配置 servlet 的对象的创建时间点：应用加载时创建。取值只能是非 0 正整数，表示启动顺 序 -->
<load-on-startup>1</load-on-startup>
</servlet>
<servlet-mapping>
<servlet-name>springmvcDispatcherServlet</servlet-name>
<url-pattern>/</url-pattern>
</servlet-mapping>
<!-- 配置 springMVC 编码过滤器 -->
<filter>
<filter-name>CharacterEncodingFilter</filter-name>
<filter-class>
org.springframework.web.filter.CharacterEncodingFilter
</filter-class>
<!-- 设置过滤器中的属性值 -->
<init-param>
<param-name>encoding</param-name>
<param-value>UTF-8</param-value>
</init-param>
<!-- 启动过滤器 -->
<init-param>
<param-name>forceEncoding</param-name>
<param-value>true</param-value>
</init-param>
</filter>
<!-- 过滤所有请求 -->
<filter-mapping>
<filter-name>CharacterEncodingFilter</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>
<welcome-file-list>
<welcome-file>index.html</welcome-file>
<welcome-file>index.htm</welcome-file>
<welcome-file>index.jsp</welcome-file>
<welcome-file>default.html</welcome-file>
<welcome-file>default.htm</welcome-file>
<welcome-file>default.jsp</welcome-file>
</welcome-file-list>
</web-app>2.1.2 编写Springmvc配置文件
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:mvc="http://www.springframework.org/schema/mvc"
xmlns:context="http://www.springframework.org/schema/context"
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.xsd
http://www.springframework.org/schema/mvc
http://www.springframework.org/schema/mvc/spring-mvc.xsd
http://www.springframework.org/schema/context
http://www.springframework.org/schema/context/spring-context.xsd">
<!-- 配置创建 spring 容器要扫描的包 -->
<context:component-scan
base-package="com.zzg">
<!-- 制定扫包规则 ,只扫描使用@Controller 注解的 JAVA 类 -->
<context:include-filter type="annotation"
expression="org.springframework.stereotype.Controller" />
</context:component-scan>
<!-- 配置视图解析器 -->
<bean
class="org.springframework.web.servlet.view.InternalResourceViewResolver">
<property name="prefix" value="/WEB-INF/pages/"></property>
<property name="suffix" value=".jsp"></property>
</bean>
<mvc:annotation-driven></mvc:annotation-driven>
</beans>2.1.3 整合Spring和SpringMVC
在web.xml 文件中配置监听器实现启动服务创建容器（在web.xml 文件中添加如下代码片段）
<!-- 配置 spring 提供的监听器，用于启动服务时加载容器 。
该间监听器只能加载 WEB-INF 目录中名称为 applicationContext.xml 的配置文件 -->
<listener>
<listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
</listener>
<!-- 手动指定 spring 配置文件位置 -->
<context-param>
<param-name>contextConfigLocation</param-name>
<param-value>classpath:spring.xml</param-value>
</context-param>2.1.4 编写spring.xml 文件
<?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:aop="http://www.springframework.org/schema/aop"
xmlns:tx="http://www.springframework.org/schema/tx"
xmlns:context="http://www.springframework.org/schema/context"
xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans.xsd
http://www.springframework.org/schema/tx
http://www.springframework.org/schema/tx/spring-tx.xsd
http://www.springframework.org/schema/aop
http://www.springframework.org/schema/aop/spring-aop.xsd
http://www.springframework.org/schema/context
http://www.springframework.org/schema/context/spring-context.xsd">
</beans>2.1.5 Spring 整合MyBatis
2.1.5.1 Spring 接管 MyBatis 的 Session 工厂(在spring.xml 文件中添加如下代码片段)
<!-- 加载配置文件 -->
<context:property-placeholder
location="classpath:jdbcConfig.properties" />
<!-- 配置 MyBatis 的 Session 工厂 -->
<bean id="sqlSessionFactory"
class="org.mybatis.spring.SqlSessionFactoryBean">
<!-- 数据库连接池 -->
<property name="dataSource" ref="dataSource" />
<!-- 自动扫描mapping.xml文件 -->
<property name="mapperLocations"
value="classpath:mapper/*.xml" />
</bean>
<!-- 配置数据源 -->
<bean id="dataSource"
class="com.mchange.v2.c3p0.ComboPooledDataSource">
<property name="driverClass" value="${jdbc.driver}"></property>
<property name="jdbcUrl" value="${jdbc.url}"></property>
<property name="user" value="${jdbc.username}"></property>
<property name="password" value="${jdbc.password}"></property>
</bean>2.1.5.2 配置自动扫描所有 Mapper 接口和文件
<!-- 配置 Mapper 扫描器 -->
<bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
<property name="basePackage" value="com.zzg.dao" />
</bean>2.1.5.3 配置 spring 的事务
<!-- 配置事务管理器 -->
<bean id="transactionManager"
class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
<property name="dataSource" ref="dataSource"></property>
</bean>
<!-- 配置事务的通知 -->
<tx:advice id="txAdvice"
transaction-manager="transactionManager">
<tx:attributes>
<tx:method name="*" propagation="REQUIRED"
read-only="false" />
<tx:method name="find*" propagation="SUPPORTS"
read-only="true" />
</tx:attributes>
</tx:advice>
<!-- 配置 aop -->
<aop:config>
<!-- 配置切入点表达式 -->
<aop:pointcut
expression="execution(* com.zzg.service.impl.*.*(..))" id="pt1" />
<!-- 建立通知和切入点表达式的关系 -->
<aop:advisor advice-ref="txAdvice" pointcut-ref="pt1" />
</aop:config>spring.xml 文件内容
<?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:aop="http://www.springframework.org/schema/aop"
xmlns:tx="http://www.springframework.org/schema/tx"
xmlns:context="http://www.springframework.org/schema/context"
xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans.xsd
http://www.springframework.org/schema/tx
http://www.springframework.org/schema/tx/spring-tx.xsd
http://www.springframework.org/schema/aop
http://www.springframework.org/schema/aop/spring-aop.xsd
http://www.springframework.org/schema/context
http://www.springframework.org/schema/context/spring-context.xsd">
<!-- 加载配置文件 -->
<context:property-placeholder
location="classpath:jdbcConfig.properties" />
<!-- 配置 MyBatis 的 Session 工厂 -->
<bean id="sqlSessionFactory"
class="org.mybatis.spring.SqlSessionFactoryBean">
<!-- 数据库连接池 -->
<property name="dataSource" ref="dataSource" />
<!-- 自动扫描mapping.xml文件 -->
<property name="mapperLocations"
value="classpath:mapper/*.xml" />
</bean>
<!-- 配置数据源 -->
<bean id="dataSource"
class="com.mchange.v2.c3p0.ComboPooledDataSource">
<property name="driverClass" value="${jdbc.driver}"></property>
<property name="jdbcUrl" value="${jdbc.url}"></property>
<property name="user" value="${jdbc.username}"></property>
<property name="password" value="${jdbc.password}"></property>
</bean>
<!-- 配置 Mapper 扫描器 -->
<bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
<property name="basePackage" value="com.zzg.dao" />
</bean>
<!-- 配置事务管理器 -->
<bean id="transactionManager"
class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
<property name="dataSource" ref="dataSource"></property>
</bean>
<!-- 配置事务的通知 -->
<tx:advice id="txAdvice"
transaction-manager="transactionManager">
<tx:attributes>
<tx:method name="*" propagation="REQUIRED"
read-only="false" />
<tx:method name="find*" propagation="SUPPORTS"
read-only="true" />
</tx:attributes>
</tx:advice>
<!-- 配置 aop -->
<aop:config>
<!-- 配置切入点表达式 -->
<aop:pointcut
expression="execution(* com.zzg.service.impl.*.*(..))" id="pt1" />
<!-- 建立通知和切入点表达式的关系 -->
<aop:advisor advice-ref="txAdvice" pointcut-ref="pt1" />
</aop:config>
</beans>第三：SSM功能展示
3.1 ssm_web:补充Controller 、jsp 页面和 MySQL8 数据库配置
Controller
package com.zzg.controller;
import java.util.List;
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.zzg.entity.Account;
import com.zzg.service.IAccountService;
/**
* 账户的控制器
*
* @Version 1.0
*/
@Controller
@RequestMapping("/account")
public class AccountController {
@Autowired
private IAccountService accountService;
/**
* 查询所有账户
*
* @return
*/
@RequestMapping(value="/findAllAccount", method= {RequestMethod.GET,RequestMethod.POST})
public ModelAndView findAllAccount() {
List<Account> accounts = accountService.findAllAccount();
ModelAndView mv = new ModelAndView();
mv.addObject("accounts", accounts);
mv.setViewName("accountlist");
return mv;
}
/**
* 保存账户
*
* @param account
* @return
*/
@RequestMapping(value="/saveAccount", method= {RequestMethod.GET,RequestMethod.POST})
public String saveAccount(Account account) {
accountService.saveAccount(account);
return "redirect:findAllAccount";
}
}
JSP
index.jsp 默认首页
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>主页</title>
</head>
<body>
<a href="account/findAllAccount">访问查询账户</a>
<hr />
<form action="account/saveAccount" method="post">
账户名称：<input type="text" name="name" /><br />
账户金额：<input type="text" name="money"><br />
<input type="submit" value="保存" />
</form>
</body>
</html>accountlist.jsp
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>账户的列表页面</title>
</head>
<body>
<table border="1" width="300px">
<tr>
<th>编号</th>
<th>账户名称</th>
<th>账户金额</th>
</tr>
<c:forEach items="${accounts}" var="account">
<tr>
<td>${account.id}</td>
<td>${account.name }</td>
<td>${account.money }</td>
</tr>
</c:forEach>
</table>
</body>
</html>jdbcConfig.properties
jdbc.driver=com.mysql.cj.jdbc.Driver
jdbc.url=jdbc:mysql://localhost:3306/ssm?useSSL=false&serverTimezone=UTC&allowPublicKeyRetrieval=true
jdbc.username=root
jdbc.password=1234563.2 ssm_dao :补充mapper 文件映射
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE mapper
PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
"http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper namespace="com.zzg.dao.IAccountDao">
<!-- 查询所有账户 -->
<select id="findAll" resultType="com.zzg.entity.Account">
select * from account
</select>
<!-- 新增账户 -->
<insert id="save" parameterType="com.zzg.entity.Account">
insert into account(name,money) values(#{name},#{money});
</insert>
</mapper>源码下载：待补充
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