目录

一、整体思路

SSM: SpringMVC + Spring + MyBatis.

SpringMVC:视图层,界面层,负责接收请求,显示处理结果的。

Spring:业务层,管理service,dao,工具类对象的。

MyBatis:持久层, 访问数据库的

用户发起请求--SpringMVC接收--Spring中的Service对象--MyBatis处理数据

SSM整合也叫做SSI (IBatis也就是mybatis的前身), 整合中有容器。

第一个容器SpringMVC容器, 管理Controller控制器对象的。第二个容器Spring容器,管理Service,Dao,工具类对象的

我们要做的把使用的对象交给合适的容器创建,管理。 把Controller还有web开发的相关对象交给springmvc容器, 这些web用的对象写在springmvc配置文件中

service,dao对象定义在spring的配置文件中,让spring管理这些对象

springmvc容器和spring容器是有关系的,关系已经确定好了

springmvc容器是spring容器的子容器, 类似java中的继承。 子可以访问父的内容

在子容器中的Controller可以访问父容器中的Service对象, 就可以实现controller使用service对象

实现步骤:

使用ssm的mysql库, 表使用student(id auto_increment, name, age)新建maven web项目加入依赖springmvc,spring,mybatis三个框架的依赖,jackson依赖,mysql驱动,druid连接池jsp,servlet依赖写web.xml注册DispatcherServlet ,目的:1.创建springmvc容器对象,才能创建Controller类对象。2.创建的是Servlet,才能接受用户的请求。注册spring的监听器:ContextLoaderListener,目的: 创建spring的容器对象,才能创建service,dao等对象。注册字符集过滤器,解决post请求乱码的问题创建包, Controller包, service ,dao,实体类包名创建好写springmvc,spring,mybatis的配置文件springmvc配置文件spring配置文件mybatis主配置文件数据库的属性配置文件写代码, dao接口和mapper文件, service和实现类,controller, 实体类。写jsp页面

二、SSM整合注解开发

需求:完成学生的注册和信息浏览

1. 建立Student

2. 建立Web工程

通过maven

3. maven依赖

<?xml version="1.0" encoding="UTF-8"?><project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd"><modelVersion>4.0.0</modelVersion><groupId>com.md</groupId><artifactId>07-ssm</artifactId><version>1.0-SNAPSHOT</version><packaging>war</packaging><properties><project.build.sourceEncoding>UTF-8</project.build.sourceEncoding><maven.compiler.source>1.8</maven.compiler.source><maven.compiler.target>1.8</maven.compiler.target></properties><dependencies><dependency><groupId>junit</groupId><artifactId>junit</artifactId><version>4.11</version><scope>test</scope></dependency><!--servlet依赖--><dependency><groupId>javax.servlet</groupId><artifactId>javax.servlet-api</artifactId><version>3.1.0</version><scope>provided</scope></dependency><!-- jsp依赖 --><dependency><groupId>javax.servlet.jsp</groupId><artifactId>jsp-api</artifactId><version>2.2.1-b03</version><scope>provided</scope></dependency><!--springmvc依赖--><dependency><groupId>org.springframework</groupId><artifactId>spring-webmvc</artifactId><version>5.2.5.RELEASE</version></dependency><!--事务--><dependency><groupId>org.springframework</groupId><artifactId>spring-tx</artifactId><version>5.2.5.RELEASE</version></dependency><dependency><groupId>org.springframework</groupId><artifactId>spring-jdbc</artifactId><version>5.2.5.RELEASE</version></dependency><dependency><groupId>com.fasterxml.jackson.core</groupId><artifactId>jackson-core</artifactId><version>2.9.0</version></dependency><dependency><groupId>com.fasterxml.jackson.core</groupId><artifactId>jackson-databind</artifactId><version>2.9.0</version></dependency><dependency><groupId>org.mybatis</groupId><artifactId>mybatis-spring</artifactId><version>1.3.1</version></dependency><dependency><groupId>org.mybatis</groupId><artifactId>mybatis</artifactId><version>3.5.1</version></dependency><dependency><groupId>mysql</groupId><artifactId>mysql-connector-java</artifactId><version>5.1.9</version></dependency><dependency><groupId>com.alibaba</groupId><artifactId>druid</artifactId><version>1.1.12</version></dependency></dependencies><build><resources><resource><directory>src/main/java</directory><!--所在的目录--><includes><!--包括目录下的.properties,.xml 文件都会扫描到--><include>**/*.properties</include><include>**/*.xml</include></includes><filtering>false</filtering></resource></resources></build></project>

4. 定义程序结构

5. 编写配置文件

jdbc属性配置文件jdbc.properties

jdbc.url=jdbc:mysql://localhost:3306/ssmjdbc.username=rootjdbc.password=123456jdbc.maxActive=20

Spring配置文件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"xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd http://www.springframework.org/schema/context https://www.springframework.org/schema/context/spring-context.xsd"><!--spring的配置文件,声明service、dao、工具类对象--><!--注册组件扫描器--><!--声明service的注解@Service所在的包名位置--><context:component-scan base-package="com.md.service"/><!--声明数据源,连接数据库--><context:property-placeholder location="classpath:conf/jdbc.properties"/><bean id="myDataSource" class="com.alibaba.druid.pool.DruidDataSource" init-method="init" destroy-method="close"><property name="url" value="${jdbc.url}" /><property name="username" value="${jdbc.username}"/><property name="password" value="${jdbc.password}" /><property name="maxActive" value="${jdbc.maxActive}" /></bean><!--SqlSessionFactory--><bean id="SqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean"><property name="dataSource" ref="myDataSource"/><property name="configLocation" value="classpath:/conf/mybatis.xml"/></bean><!--创建 dao对象--><bean class="org.mybatis.spring.mapper.MapperScannerConfigurer"><property name="sqlSessionFactoryBeanName" value="SqlSessionFactory"/><!--指定包名,包名是dao接口所在的包名,dao默认对象的名称:是接口名字的首字母小写--><property name="basePackage" value="com.md.dao"/></bean><!--上面的这个是一个模板,只有一些配置文件的路径是根据自己创建写的--></beans>

SpringMVC的配置文件,dispatcherServlet.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/beans http://www.springframework.org/schema/beans/spring-beans.xsd http://www.springframework.org/schema/context https://www.springframework.org/schema/context/spring-context.xsd http://www.springframework.org/schema/mvc https://www.springframework.org/schema/mvc/spring-mvc.xsd"><!-- springmvc的配置文件,声明controller和其他web相关的对象--><!-- 注册组件扫描器,指定@Controller注解所在的类--><context:component-scan base-package="com.md.controller"/><!-- 指定视图解析器--><bean class="org.springframework.web.servlet.view.InternalResourceViewResolver"><property name="prefix" value="/WEB-INF/jsp/"/><property name="suffix" value=".jsp"/></bean><!--注册注解驱动1. 响应ajax请求,返回json2. 解决静态资源访问问题--><mvc:annotation-driven/></beans>

mybatis的配置文件 , mybatis.xml

<?xml version="1.0" encoding="UTF-8" ?><!DOCTYPE configurationPUBLIC "-//mybatis.org//DTD Config 3.0//EN""http://mybatis.org/dtd/mybatis-3-config.dtd"><configuration><!--<settings>--><!--<!–设置日志–>--><!--<setting name="logImpl" value="STDOUT_LOGGING"/>--><!--</settings>--><!--设置别名,在mapper.xml文件中,返回值不用在写包名了,直接写类名即可--><typeAliases><package name="com.md.domain"/></typeAliases><!-- sql映射文件的位置 --><mappers><!--name是包名,这个包中所有mapper.xml一次加载使用package的要求1. mapper文件名称和dao接口名称必须完全一样2. mapper文件和dao接口必须在同一目录--><package name="com.md.dao"/></mappers></configuration>

6. 定义web.xml

由于自动生成的是这样的,版本太低,需要换成现在高的版本,直接把之前写好的复制过来就行

换成这样

注册 ContextLoaderListener注册 DisatcherServlet注册字符集过滤器同时创建 Spring 的配置文件和 SpringMVC 的配置文件(上面已经创建好了)<?xml version="1.0" encoding="UTF-8"?><web-app xmlns="http://xmlns.jcp.org/xml/ns/javaee"xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_4_0.xsd"version="4.0"><!--注册中央调度器--><servlet><servlet-name>springmvc</servlet-name><servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class><init-param><param-name>contextConfigLocation</param-name><!--自定义路径--><param-value>classpath:conf/dispatcherServlet.xml</param-value></init-param><load-on-startup>1</load-on-startup></servlet><servlet-mapping><servlet-name>springmvc</servlet-name><url-pattern>*.do</url-pattern></servlet-mapping><!--注册spring监听器--><context-param><param-name>contextConfigLocation</param-name><!--自定义路径--><param-value>classpath:conf/applicationContext.xml</param-value></context-param><listener><listener-class>org.springframework.web.context.ContextLoaderListener</listener-class></listener><!--注册字符集过滤器--><!--声明过滤器,解决post请求乱码的问题--><filter><filter-name>characterEncodingFilter</filter-name><filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class><!--设置项目中使用的编码--><init-param><param-name>encoding</param-name><param-value>utf-8</param-value></init-param><init-param><param-name>forceRequestEncoding</param-name><param-value>true</param-value></init-param><init-param><param-name>forceResponseEncoding</param-name><param-value>true</param-value></init-param></filter><filter-mapping><filter-name>characterEncodingFilter</filter-name><!--/* : 所有的请求都会先通过这个过滤器--><url-pattern>/*</url-pattern></filter-mapping></web-app>

7. 实体类

package com.md.domain;/*** @author MD* @create 2020-08-13 20:21*/public class Student {private Integer id;privateString name;private Integer age;public Student() {}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 Integer getAge() {return age;}public void setAge(Integer age) {this.age = age;}@Overridepublic String toString() {return "Student{" +"id=" + id +", name=" + name + \ +", age=" + age +};}}

8. Dao接口和映射文件

都在是dao包下,且文件名相同

package com.md.dao;import com.md.domain.Student;import java.util.List;/*** @author MD* @create 2020-08-13 20:22*/public interface StudentDao {int insertStudent(Student student);List<Student> selectStudents();}

StudentDao.xml

<?xml version="1.0" encoding="UTF-8" ?><!DOCTYPE mapperPUBLIC "-//mybatis.org//DTD Mapper 3.0//EN""http://mybatis.org/dtd/mybatis-3-mapper.dtd"><mapper namespace="com.md.dao.StudentDao"><insert id="insertStudent" >insert into student(name,age) values(#{name} , #{age})</insert><!--设置了别名,这里返回值直接写类名--><select id="selectStudents" resultType="Student">select id, name , age from student</select></mapper>

9. Service接口和实现类

package com.md.service;import com.md.domain.Student;import java.util.List;/*** @authorMD*@create 2020-08-13 20:31*/public interface StudentService {int addStudent(Student student);List<Student> findStudents();}

实现类

packagecom.md.service.impl;import com.md.dao.StudentDao;import com.md.domain.Student;import com.md.service.StudentService;import org.springframework.stereotype.Service;import javax.annotation.Resource;import java.util.List;/*** @author MD* @create 2020-08-13 20:32*/@Servicepublic class StudentServiceImpl implements StudentService {// 引用数据类型的自动注入@Resource、@Autowired@Resourceprivate StudentDao studentDao;@Overridepublic int addStudent(Student student) {int nums = studentDao.insertStudent(student);return nums;}@Overridepublic List<Student> findStudents() {return studentDao.selectStudents();}}

10. 处理器

在controller包下

package com.md.controller;import com.md.domain.Student;import com.md.service.StudentService;importorg.springframework.stereotype.Controller;import org.springframework.web.bind.annotation.RequestMapping;import org.springframework.web.bind.annotation.ResponseBody;importorg.springframework.web.servlet.ModelAndView;import javax.annotation.Resource;import java.util.List;/*** @author MD* @create 2020-08-13 20:37*/@Controller@RequestMapping("/student")public class StudentController {// 自动注入@Resourceprivate StudentService service;// 注册学生@RequestMapping("/addStudent.do")public ModelAndView addStudent(Student student){ModelAndView mv = new ModelAndView();String tips = "注册失败";// 调用service处理studentint nums = service.addStudent(student);if (nums > 0){tips = "注册成功";}// 添加数据,指定页面mv.addObject("tips",tips);mv.setViewName("result");return mv;}// 处理查询,响应ajax@RequestMapping("/queryStudent.do")@ResponseBodypublic List<Student> queryStudent(){List<Student> students = service.findStudents();// 会被框架转为json的数组return students;}}

11. 首页

index.jsp

<%@ page contentType="text/html;charset=UTF-8" language="java" %><%String basePath = request.getScheme()+ "://" +request.getServerName() + ":" + request.getServerPort() +request.getContextPath() + "/";%><html><head><title>功能入口</title><base href="<%=basePath%>"></head><body><div align="center"><h2>SSM整合</h2><table><tr><td> <a href="addStudent.jsp">学生注册</a> </td></tr><br><tr><td><a href="listStudent.jsp">学生信息</a> </td></tr></table></div></body></html>

12. 注册页面

addStudent.jsp

<%@ page contentType="text/html;charset=UTF-8" language="java" %><%String basePath = request.getScheme() + "://" +request.getServerName() + ":" + request.getServerPort() +request.getContextPath() + "/";%><html><head><title>学生注册</title><base href="<%=basePath%>"></head><body><div align="center"><form action="student/addStudent.do" method="post"><table><tr><td>姓名:</td><td><input type="text" name="name"></td></tr><tr><td>年龄:</td><td><input type="text" name="age"></td></tr><tr><td> </td><td><input type="submit" value="注 册"></td></tr></table></form></div></body></html>

13. 注册结果

在/WEB-INF/jsp/result.jsp

<%--Created by IntelliJ IDEA.User: MDDate: 2020/8/13Time: 20:45To change thistemplate use File | Settings | File Templates.--%><%@ page contentType="text/html;charset=UTF-8" language="java" %><html><head><title>Title</title></head><body><h1>注册结果:${tips}</h1></body></html>

14. 浏览页面

listStudent.jsp

<%--Created by IntelliJ IDEA.User: MDDate: 2020/8/13Time: 21:10To change this template use File|Settings | File Templates.--%><%@ page contentType="text/html;charset=UTF-8" language="java" %><%String basePath = request.getScheme() + "://" +request.getServerName() + ":" + request.getServerPort() +request.getContextPath() + "/";%><html><head><title>学生信息</title><base href="<%=basePath%>"><script type="text/javascript" src="js/jquery-3.4.1.js"></script><script type="text/javascript" >$(function () {// 在当前的页面加载后执行loadStudent函数loadStudent();$("#btn").click(function () {loadStudent();});});// 自定义函数function loadStudent() {$.ajax({url:"student/queryStudent.do",type:"get",dataType:"json",success:function (data) {// 清除旧数据$("#info").html("");$.each(data,function (i,n) {// 添加新数据$("#info").append("<tr>").append("<td>"+n.id+"</td>").append("<td>"+n.name+"</td>").append("<td>"+n.age+"</td>").append("</tr>")})}});}</script></head><body><div align="center"><table><thead><tr><td>学号</td><td>姓名</td><td>年龄</td></tr></thead><tbody id="info"></tbody></table><input type="button" id="btn" value="查询数据"></div></body></html>

此时再配置Tomcat运行即可,之后再添加新的功能

分类: 教程分享 标签: 暂无标签

评论

暂无评论数据

暂无评论数据

目录