SSM 整合笔记

2024-01-20 14:28:34

SSM整合

环境配置

要手动导的包很多，还是maven好啊…

db.properties

jdbc.driver=com.mysql.cj.jdbc.Driver
jdbc.url=jdbc:mysql://localhost:3306/ssm?serverTimezone=Hongkong
jdbc.username=root
jdbc.password=cyt19880818

web.xml 配置

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://xmlns.jcp.org/xml/ns/javaee" xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_4_0.xsd" id="WebApp_ID" version="4.0">
  <display-name>ssm</display-name>
  
  	<!-- Spring 配置 -->
  	<!-- needed for ContextLoaderListener -->
	<context-param>
		<param-name>contextConfigLocation</param-name>
		<param-value>classpath:applicationContext.xml</param-value>
	</context-param>

	<!-- Bootstraps the root web application context before servlet initialization -->
	<listener>
		<listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
	</listener>
	
	<!-- Spring MVC配置 -->
	<!-- The front controller of this Spring Web application, responsible for handling all application requests -->
	<servlet>
		<servlet-name>springDispatcherServlet</servlet-name>
		<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
		<init-param>
			<param-name>contextConfigLocation</param-name>
			<param-value>classpath:spring-mvc.xml</param-value>
		</init-param>
		<load-on-startup>1</load-on-startup>
	</servlet>

	<!-- Map all requests to the DispatcherServlet for handling -->
	<servlet-mapping>
		<servlet-name>springDispatcherServlet</servlet-name>
		<url-pattern>/</url-pattern>
	</servlet-mapping>
	
	<!-- 字符编码过滤器 -->
	<filter>
		<filter-name>characterEncodingFilter</filter-name>
		<filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class>
		<init-param>
			<param-name>encoding</param-name>
			<param-value>UTF-8</param-value>
		</init-param>
	</filter>
	<filter-mapping>
		<filter-name>characterEncodingFilter</filter-name>
		<url-pattern>/*</url-pattern>
	</filter-mapping>
	
	<!-- REST 过滤器 -->
	<filter>
		<filter-name>hiddenHttpMethodFilter</filter-name>
		<filter-class>org.springframework.web.filter.HiddenHttpMethodFilter</filter-class>
	</filter>
	<filter-mapping>
		<filter-name>HiddenHttpMethodFilter</filter-name>
		<url-pattern>/*</url-pattern>
	</filter-mapping>
	
</web-app>

SpringMVC配置

spring-mvc.xml

<?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:mvc="http://www.springframework.org/schema/mvc"
	xsi:schemaLocation="http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-4.3.xsd
		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-4.3.xsd">

	<!-- 组件扫描 -->
	<context:component-scan base-package="com.cyt.ssm" use-default-filters="false">
		<context:include-filter type="annotation" expression="org.springframework.stereotype.Controller"/>
	</context:component-scan>
	
	<!-- 视图解析器 -->
	<bean id="internalResourceViewResolver" class="org.springframework.web.servlet.view.InternalResourceViewResolver">
		<property name="prefix" value="/WEB-INF/views/"></property>
		<property name="suffix" value=".jsp"></property>
	</bean> 
	
	<mvc:default-servlet-handler/>
	<mvc:annotation-driven></mvc:annotation-driven>
	
</beans>

Spring配置

applicationContext.xml

<?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:tx="http://www.springframework.org/schema/tx"
	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-4.3.xsd
		http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-4.3.xsd">

	<!-- 组件扫描 -->
	<context:component-scan base-package="com.cyt.ssm">
		<context:exclude-filter type="annotation" expression="org.springframework.stereotype.Controller"/>
	</context:component-scan>

	<!-- 数据源 -->
	<context:property-placeholder location="classpath:db.properties"/>
	<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>
	
	<!-- 事务 -->
	<bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
		<property name="dataSource" ref="dataSource"></property>
	</bean>
	<tx:annotation-driven transaction-manager="transactionManager"/>
	
</beans>

Spring 整合Mybatis

applicationContext.xml

<?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:tx="http://www.springframework.org/schema/tx"
	xmlns:mybatis-spring="http://mybatis.org/schema/mybatis-spring"
	xsi:schemaLocation="http://mybatis.org/schema/mybatis-spring http://mybatis.org/schema/mybatis-spring-1.2.xsd
		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-4.3.xsd
		http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-4.3.xsd">

	<!-- 组件扫描 -->
	<context:component-scan base-package="com.cyt.ssm">
		<context:exclude-filter type="annotation" expression="org.springframework.stereotype.Controller"/>
	</context:component-scan>

	<!-- 数据源 -->
	<context:property-placeholder location="classpath:db.properties"/>
	<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>
	
	<!-- 事务 -->
	<bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
		<property name="dataSource" ref="dataSource"></property>
	</bean>
	<tx:annotation-driven transaction-manager="transactionManager"/>
	
	<!-- Spring 整合 Mybatis -->
	<!-- Mybatis的SqlSession的创建 -->
	<bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
		<!-- Mybatis全局配置文件 -->
		<property name="configLocation" value="classpath:mybatis-config.xml"></property>
		<!-- 数据源 -->
		<property name="dataSource" ref="dataSource"></property>
		<!-- Mybatis的SQL映射文件 -->
		<property name="mapperLocations" value="classpath:com/cyt/ssm/mapper/*.xml"></property>
		<!-- <property name="typeAliasesPackage" value=""></property> -->
		
	</bean>
	
	<!-- MyBatis的数据接口的代理实现类 -->
	<mybatis-spring:scan base-package="com.cyt.ssm.dao"/>
	
</beans>

在文件中添加  部分

mybatis-config.xml

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE configuration
PUBLIC "-//mybatis.org//DTD Config 3.0//EN" 
"http://mybatis.org/dtd/mybatis-3-config.dtd">
<configuration>
	
	<settings>
		<setting name="mapUnderscoreToCamelCase" value="true"/>
		<setting name="lazyLoadingEnabled" value="true"/>
		<setting name="aggressiveLazyLoading" value="false"/>
	</settings>
	
</configuration>

案例

Dao基本实现

Goods.java

public class Goods {
	private Integer goodsId;
	private String name;
	private Integer price;
	private Integer quantity;

GoodsDao.java

public interface GoodsDao {
	public Goods getGoodsById(Integer id);
	public void update(Goods goods);
	public List<Goods> getAllGoods();
}

GoodsMapper.xml

<?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.cyt.ssm.dao.GoodsDao">
	
	<!-- public Goods getGoodsById(Integer id); -->
	<select id="getGoodsById" resultType="com.cyt.ssm.bean.Goods">
		select * from tbl_goods 
		where goods_id=#{id};
	</select>
	
	<!-- public void update(Goods goods); -->
	<select id="update">
		update tbl_goods set name=#{name}, price=#{price}, quantity=#{quantity} 
		where goods_id=#{goodsId};
	</select>
	
	<!-- public List<Goods> getAllGoods(); -->
		<select id="getAllGoods" resultType="com.cyt.ssm.bean.Goods">
		select * from tbl_goods;
	</select>
	
</mapper>

Junit Test

class GoodsDaoTest {
	private SqlSession session;
	private ConfigurableApplicationContext context;
	
	@BeforeEach
	public void Init() {
		context = new ClassPathXmlApplicationContext("applicationContext.xml");
		SqlSessionFactory factory = context.getBean("sqlSessionFactory",SqlSessionFactory.class);
		session = factory.openSession();
	}
	
	@AfterEach
	public void close() {
		context.close();
	}

    // 测试查询单个
	@Test
	void testGetGoodsById() {
		try {
			System.out.println(session);
			GoodsDao dao = session.getMapper(GoodsDao.class);
			Goods goods = dao.getGoodsById(101);
			System.out.println(goods);
		} catch (Exception e) {
			session.close();
		}
	}
	
    // 测试查询多个
	@Test
	void testGetAllGoods() {
		try {
			System.out.println(session);
			GoodsDao dao = session.getMapper(GoodsDao.class);
			List<Goods> goods = dao.getAllGoods();
			System.out.println(goods);
		} catch (Exception e) {
			session.close();
		}
	}
	
    // 测试更新
	@Test
	void testUpdate() {
		try {
			System.out.println(session);
			GoodsDao dao = session.getMapper(GoodsDao.class);
			Goods goods = new Goods(101, "Nike", 55, 14);
			dao.update(goods);
		} catch (Exception e) {
			session.close();
		}
	}
}

List实现

GoodsController.java

package com.cyt.ssm.controller;

import java.util.List;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;

import com.cyt.ssm.bean.Goods;
import com.cyt.ssm.service.GoodsService;

@Controller
@RequestMapping("/goods")
public class GoodsController {
	
	@Autowired
	private GoodsService service;
	
	@GetMapping("/list")
	public String list(Model model) {
		List<Goods> goods = service.getAllGoods();
		model.addAttribute("goods",goods);
		return "goodsList";		
	}
}

GoodsService.java

@Service
public class GoodsService {

	@Autowired
	private GoodsDao dao;

	public List<Goods> getAllGoods(){
		return dao.getAllGoods();
	}
}

index.jsp

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>LALALALA</title>
</head>
<body>
	<a href="${pageContext.request.contextPath }/goods/list">Go to List Page</a>
</body>
</html>

goodsList.jsp

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Good List</title>
</head>
<body>
	<h4>Goods List Page</h4>
	<table border="1" cellspacing="0" cellpadding="3">
		<tr>
		<th>ID</th>
		<th>Name</th>
		<th>Price</th>
		<th>Quantity</th>
		<th>Update</th>
		<th>Delete</th>
		</tr>
		<c:forEach items="${requestScope.goods }" var="g">
		<tr>
			<td>${g.goodsId }</td>
			<td>${g.name }</td>
			<td>${g.price }</td>
			<td>${g.quantity }</td>
			<td><a href="${pageContext.request.contextPath }/goods/edit/${g.goodsId }">Update</a></td>
			<td>delete</td>
		</tr>
		</c:forEach>
	</table>
</body>
</html>

Edit 实现

goodsEdit.jsp

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<%@ taglib prefix="form" uri="http://www.springframework.org/tags/form"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Goods Edit</title>
</head>
<body>
	<h4>Good Edit Page</h4>
	<form:form modelAttribute="goods" action="${pageContext.request.contextPath }/goods/update"
	method="post">
		<form:hidden path="goodsId"/>
		<input type="hidden" name="_method" value="put"/>
		Name: ${requestScope.goods.name }<br><br>
		Price: <form:input path="price"/><br><br>
		Quantity: <form:input path="quantity"/><br><br>
		<input type="submit" value="Submit">
	</form:form>
</body>
</html>

GoodsController.java 添加 public String edit(@PathVariable("id") Integer id,Model model)

package com.cyt.ssm.controller;

import java.util.List;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;

import com.cyt.ssm.bean.Goods;
import com.cyt.ssm.service.GoodsService;

@Controller
@RequestMapping("/goods")
public class GoodsController {
	
	@Autowired
	private GoodsService service;
	
	@GetMapping("/list")
	public String list(Model model) {
		List<Goods> goods = service.getAllGoods();
		model.addAttribute("goods",goods);
		return "goodsList";		
	}
	
	@GetMapping("/edit/{id}")
	public String edit(@PathVariable("id") Integer id,Model model) {
		Goods goods = service.getGoodsById(id);
		model.addAttribute("goods", goods);
		return "goodsEdit";
	}
}

Update实现

在 GoodsService.java 中添加 updateGoods

@Service
public class GoodsService {

	@Autowired
	private GoodsDao dao;

	public List<Goods> getAllGoods(){
		return dao.getAllGoods();
	}
	
	public Goods getGoodsById(Integer id) {
		return dao.getGoodsById(id);
	}
	
	public void updateGoods(Goods goods) {
		dao.update(goods);
	}
}

在 GoodsController.java 中添加 prepareModel 和 update

@Controller
@RequestMapping("/goods")
public class GoodsController {
	
	......
	
	@ModelAttribute
	public void prepareModel(@RequestParam(value = "goodsId", required = false)Integer id,HttpServletRequest request,
			Model model) {
		String servletPath = request.getServletPath();
		if (servletPath.equals("/goods/update")) {
			Goods goods = service.getGoodsById(id);
			model.addAttribute("goods", goods);
		}
	}
	
	@PutMapping("/update")
	public String update(Goods goods) {
//		System.out.println(goods);
		service.updateGoods(goods);
		return "redirect:/goods/list";
	}
}

如同SpringMVC中讲过的 @ModelAttribute，可以在控制器执行之前对数据做预装载

注意事项

使用REST风格开发时，发送的请求url中含有所需数据的，可以用 @PathVariable 取出，@Pa thVariable(“id”) 中的 id 和 @GetMapping("/edit/{id}") 中的 id 对应

例如

@GetMapping("/edit/{id}")
public String edit(@PathVariable("id") Integer id,Model model) {
    Goods goods = service.getGoodsById(id);
    model.addAttribute("goods", goods);
    return "goodsEdit";
}

请求类型的转换

在这个例子中需要对post请求转换成put请求，故使用 <input type="hidden" name="_method" value="put"/>

<form:form modelAttribute="goods" action="${pageContext.request.contextPath }/goods/update"
           method="post">
    <form:hidden path="goodsId"/>
    <input type="hidden" name="_method" value="put"/>
    Name: ${requestScope.goods.name }<br><br>
    Price: <form:input path="price"/><br><br>
    Quantity: <form:input path="quantity"/><br><br>
    <input type="submit" value="Submit">
</form:form>

起作用的 HiddenHttpMethodFilter 过滤器：

web.xml

<!-- REST 过滤器 -->
<filter>
    <filter-name>hiddenHttpMethodFilter</filter-name>
    <filter-class>org.springframework.web.filter.HiddenHttpMethodFilter</filter-class>
</filter>
<filter-mapping>
    <filter-name>hiddenHttpMethodFilter</filter-name>
    <url-pattern>/*</url-pattern>
</filter-mapping>

使用@ModelAttribute准备模型数据：

在用户的页面中有时候不能把需要的数据显示出来，故需要用hidden的一些标签，但如此过于繁琐，可以用@ModelAttribute在方法中把模型数据获取，进行操作后得到完成的对象数据等在往下进行。

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