ssm框架整合演示
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2022-04-15 18:56:35
ssm框架开发整合演示ssm框架是指spring+springMVC+MyBatis 整合开发开发,这里我将使用mysql做一个简单查询学生信息并展示到jsp页面上的演示springSpring是一个轻量级的控制反转(IoC)和面向切面(AOP)的容器框架。springMVCM 代表 模型(Model)模型是什么呢? 模型就是数据,就是 dao,beanV 代表 视图(View)视图是什么呢? 就是网页, JSP,用来展示模型中的数据C 代表 控制器(controller)控制器是什么?...
ssm框架开发整合演示
ssm框架是指spring+springMVC+MyBatis 整合开发开发,这里我将使用mysql做一个简单查询学生信息并展示到jsp页面上的演示
spring
Spring是一个轻量级的控制反转(IoC)和面向切面(AOP)的容器框架。
springMVC
M 代表 模型(Model)
模型是什么呢? 模型就是数据,就是 dao,bean
V 代表 视图(View)
视图是什么呢? 就是网页, JSP,用来展示模型中的数据
C 代表 控制器(controller)
控制器是什么? 控制器的作用就是把不同的数据(Model),显示在不同的视图(View)上,Servlet 扮演的就是这样的角色。
MyBatis
MyBatis 是一款优秀的持久层框架,它支持定制化 SQL、存储过程以及高级映射。
这里只对其做了简单描述,如想知道详情可自行百度
1.导入所需要的jar包
2.在mysql数据库中建student表分别插入数据
3.创建一个实体类Student
package com.liu.entity;
public class Student {
private long stuId;
private String stuName;
private int stuAge;
public long getStuId() {
return stuId;
}
public void setStuId(long stuId) {
this.stuId = stuId;
}
public String getStuName() {
return stuName;
}
public void setStuName(String stuName) {
this.stuName = stuName;
}
public int getStuAge() {
return stuAge;
}
public void setStuAge(int stuAge) {
this.stuAge = stuAge;
}
@Override
public String toString() {
return "Student [stuId=" + stuId + ", stuName=" + stuName + ", stuAge=" + stuAge + "]";
}
}
注意:这里的属性名和类型要与数据库中的一致。
4.在dao层建查询的接口
package com.liu.dao;
import java.util.List;
import com.liu.entity.Student;
public interface StudentDao {
public List<Student> findAll();
}
5.在mapper包下新建studentMapper.xml,用于对mysql的操作
<?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">
<!-- 指向接口 -->
<mapper namespace="com.liu.dao.StudentDao">
<select id="findAll" resultMap="getUserMap">
select * from student;
</select>
<!-- 配置resulMap -->
<resultMap type="Student" id="getUserMap">
<id column="stuId" property="stuId"/>
<result column="stuName" property="stuName"/>
<result column="stuAge" property="stuAge"/>
</resultMap>
</mapper>
配置的resultMap要与实体类属性名和数据库的字段名相同
6.在src下建spring.xml创建mybatis的sqlsessionFactory对象
<?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"
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">
<!-- 引入db.properties -->
<context:property-placeholder location="classpath:db.properties"/>
<!-- 数据库连接池 -->
<bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource">
<property name="driverClass" value="${driver}"></property>
<property name="jdbcUrl" value="${url}"></property>
<property name="user" value="${user}"></property>
<property name="password" value="${password}"></property>
</bean>
<!-- 创建mybatis的sqlsessionFactory对象 -->
<bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
<property name="dataSource" ref="dataSource"></property>
<property name="mapperLocations" value="classpath:com/liu/mapper/*.xml"></property>
<!-- 配置取简单类名路径 -->
<property name="typeAliasesPackage" value="com.liu.entity"></property>
</bean>
<!-- 配置mapperScannerConfigurer -->
<bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
<property name="basePackage" value="com.liu.dao"></property>
<!-- 将com.liu.dao包中所有接口产生与之对应的动态代理对象(对象名就是首字母小写的接口名) -->
<property name="sqlSessionFactoryBeanName" value="sqlSessionFactory"></property>
</bean>
</beans>
7.编写db.properties设置连接mysql
8.在web.xml中引入spring.xml
<?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" id="WebApp_ID" version="2.5">
<display-name>SSM</display-name>
<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项目中引入spring -->
<context-param>
<param-name>contextConfigLocation</param-name>
<param-value>classpath:spring.xml</param-value>
</context-param>
<listener>
<listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
</listener>
</web-app>
9.编写service接口
package com.liu.service;
import java.util.List;
import com.liu.entity.Student;
public interface StudentService {
List<Student> findAl();
}
10.编写service的初始(逻辑基本写在这)
package com.liu.service.impl;
import java.util.List;
import com.liu.dao.StudentDao;
import com.liu.entity.Student;
import com.liu.service.StudentService;
public class StudentServiceImpl implements StudentService{
//service依赖于dao
private StudentDao studentDao;
public void setStudentDao(StudentDao studentDao) {
this.studentDao = studentDao;
}
public List<Student> findAl() {
return studentDao.findAll();
}
}
在spring中注入依赖
<!-- 依赖注入 -->
<bean id="studentService" class="com.liu.service.impl.StudentServiceImpl">
<property name="studentDao" ref="studentDao"></property>
</bean>
11.在src下创建springmvc.xml并在web.xml中引入
<?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/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
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">
<!-- 扫描有注解的包 -->
<context:component-scan base-package="com.liu.controller"></context:component-scan>
<!-- 配置视图解析器 -->
<bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
<property name="prefix" value="/views/"></property>
<property name="suffix" value=".jsp"></property>
</bean>
<!-- 对静态动态资源的处理,使用servict -->
<mvc:annotation-driven></mvc:annotation-driven>
<mvc:default-servlet-handler/>
</beans>
在web.xml中配置
<!-- 引入springmvc -->
<!-- 拦截全部请求交给mvc处理 -->
<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:springmvc.xml</param-value>
</init-param>
<!-- 容器在应用启动时就加载并初始化这个 -->
<load-on-startup>1</load-on-startup>
</servlet>
<servlet-mapping>
<servlet-name>springDispatcherServlet</servlet-name>
<url-pattern>/</url-pattern>
</servlet-mapping>
12.编写控制层StudentController
package com.liu.controller;
import java.util.List;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.ui.ModelMap;
import org.springframework.web.bind.annotation.RequestMapping;
import com.liu.entity.Student;
import com.liu.service.StudentService;
@RequestMapping("controller")
@Controller
public class StudentController {
//控制器依赖于service
@Autowired
private StudentService studentService;
@RequestMapping("findAll")
public String findAll(ModelMap map) {
List<Student> student = studentService.findAl();
map.put("students", student);
return "findAll";
}
}
13.编写index.jsp中添加请求
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Insert title here</title>
</head>
<body>
<a href="controller/findAll">查询学生</a>
</body>
</html>
14.编写返回的/views/findAll.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>Insert title here</title>
</head>
<body>
<c:forEach items="${requestScope.students}" var="student">
${student.stuId}--${student.stuName}--${student.stuAge}<br>
</c:forEach>
</body>
</html>
15.启动测试
当点击查询学生时,跳转到/views/findAll.jsp并在jsp中展示出查到的内容
至此,简单的ssm整合查询student成功显示!
本文地址:https://blog.csdn.net/qq_44846864/article/details/109255474