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目录

一、前言

二、推荐开发及运行环境

三、项目基本结构

四、创建一个普通JAVAEE-WEB项目

 五、搭建数据库

 六、pom.xml引入依赖

七、创建实体类

 八、创建三层架构对应模块的类和接口

九、Spring和Mybatis的整合

1、spring的配置文件：

2、Spring和Mybatis的整合配置

3、整合测试

4、测试结果

九、Spring和SpringMVC整合

1、Spring的配置

2、SpringMVC的配置

3、SSM框架整合测试

十、注意事项及其BUG反馈

1、控制台中文乱码解决办法：

 2、Mysql数据库中文乱码解决办法：

 3、服务器日志中文乱码解决办法：

4、出现no appropriate protocal 异常报错

 5、出现java.lang.NoClassDefFoundError：javax/severlet/报错

十一、总结

一、前言

  最快的提升自己的编程水平以及对某个方向的理解和运用，必然是需要动手实践，在不断的Debug中自我折磨，然后放弃！！！（玩笑）

  本篇文章只是进行基础的SSM框架（Sping+SpringMVC+Mybatis）的整合的教程，以及其中可能遇到的问题的简单解决办法！因为刚开始起手一个项目，自然需要一个过渡阶段，否则前期将会异常艰难。

  废话不多说，开始吧！

全程干货不累赘，开始发车！！

Final Test Result：

二、推荐开发及运行环境

1、系统：Windows10

2、IDE：Interilj ideal 2021.3

3、服务器：Tomacat-8（用高版本对应的Severlet-4.0会启动报错，注意！！）

4、数据库：MySQL5.7

5、浏览器：FireFox

6、JavaKit：JDK18

三、项目基本结构

四、创建一个普通JAVAEE-WEB项目

1、点击File，new，project

 2、创建一个JavaEnterpri项目，选择对应JDK，命名为SSM，选择JavaEE8，然后Finish

 五、搭建数据库

1、创建SSM数据库和tb_book数据表

create database SSM;create table tb_book(id int(11) primary key,name varchar(20) not null,press varchar(20) not null,author varchar(20) not null);

 2、插入数据

insert into tb_book(id,name,press,author) values(1,"Moving Earth","人民出版社","刘慈欣");

 六、pom.xml引入依赖

代码如下：（复制粘贴即可）

<?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 https://maven.apache.org/xsd/maven-4.0.0.xsd"> <modelVersion>4.0.0</modelVersion> <groupId>com.example</groupId> <artifactId>SSM</artifactId> <version>1.0-SNAPSHOT</version> <name>SSM</name> <packaging>war</packaging> <properties> <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding> <maven.compiler.target>1.8</maven.compiler.target> <maven.compiler.source>1.8</maven.compiler.source> <junit.version>5.8.1</junit.version> </properties> <dependencies> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-context</artifactId> <version>5.2.8.RELEASE</version> </dependency> <!--Spring事务管理--> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-tx</artifactId> <version>5.2.8.RELEASE</version> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-jdbc</artifactId> <version>5.2.8.RELEASE</version> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-test</artifactId> <version>5.2.8.RELEASE</version> </dependency> <!--Spring MVC的相关依赖--> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-webmvc</artifactId> <version>5.2.8.RELEASE</version> </dependency> <!--MyBatis相关依赖--> <dependency> <groupId>org.mybatis</groupId> <artifactId>mybatis</artifactId> <version>3.5.2</version> </dependency> <!--MyBatis与Spring整合相关依赖--> <dependency> <groupId>org.mybatis</groupId> <artifactId>mybatis-spring</artifactId> <version>2.0.1</version> </dependency> <!--数据源--> <dependency> <groupId>com.alibaba</groupId> <artifactId>druid</artifactId> <version>1.1.20</version> </dependency> <dependency> <groupId>javax.servlet</groupId> <artifactId>javax.servlet-api</artifactId> <version>4.0.1</version> </dependency> <dependency> <groupId>org.apache.cxf</groupId> <artifactId>cxf-rt-frontend-jaxrs</artifactId> <version>3.4.5</version> </dependency> <dependency> <groupId>org.junit.jupiter</groupId> <artifactId>junit-jupiter-api</artifactId> <version>${junit.version}</version> <scope>test</scope> </dependency> <dependency> <groupId>org.junit.jupiter</groupId> <artifactId>junit-jupiter-engine</artifactId> <version>${junit.version}</version> <scope>test</scope> </dependency> <dependency> <groupId>javax.servlet.jsp</groupId> <artifactId>jsp-api</artifactId> <version>2.2</version> <scope>provided</scope> </dependency> <!-- 数据库驱动相关依赖--> <dependency> <groupId>mysql</groupId> <artifactId>mysql-connector-java</artifactId> <version>8.0.11</version> </dependency> <dependency> <groupId>junit</groupId> <artifactId>junit</artifactId> <version>4.13</version> <scope>test</scope> </dependency> </dependencies> <build> <finalName>SSM</finalName> <pluginManagement><!-- lock down plugins versions to avoid using Maven defaults (may be moved to parent pom) --> <plugins> <plugin> <artifactId>maven-clean-plugin</artifactId> <version>3.1.0</version> </plugin> <!-- see http://maven.apache.org/ref/current/maven-core/default-bindings.html#Plugin_bindings_for_war_packaging --> <plugin> <artifactId>maven-resources-plugin</artifactId> <version>3.0.2</version> </plugin> <plugin> <artifactId>maven-compiler-plugin</artifactId> <version>3.8.0</version> </plugin> <plugin> <artifactId>maven-surefire-plugin</artifactId> <version>2.22.1</version> </plugin> <plugin> <artifactId>maven-war-plugin</artifactId> <version>3.2.2</version> </plugin> <plugin> <artifactId>maven-install-plugin</artifactId> <version>2.5.2</version> </plugin> <plugin> <artifactId>maven-deploy-plugin</artifactId> <version>2.8.2</version> </plugin> </plugins> </pluginManagement> <plugins> <plugin> <groupId>org.apache.maven.plugins</groupId> <artifactId>maven-war-plugin</artifactId> <version>3.3.2</version> </plugin> </plugins> <!-- 如果不添加此节点mybatis的mapper.xml文件都会被漏掉。 --> <resources> <resource> <directory>src/main/java</directory> <includes> <include>**/*.properties</include> <include>**/*.xml</include> </includes> <filtering>false</filtering> </resource> <resource> <directory>src/main/resources</directory> <includes> <include>**/*.properties</include> <include>**/*.xml</include> </includes> <filtering>false</filtering> </resource> </resources> </build></project>

七、创建实体类

src/main/java下创建com.itheima.domain包，创建Book实体类

1-1Book.java

package com.itheima.domain;public class Book { private Integer id; private String name; private String press; private String author; public Integer getId() { return id; } public void setId(Integer id){ this.id=id; } public void setName(String name) { this.name = name; } public String getName() { return name; } public void setAuthor(String author) { this.author = author; } public String getAuthor() { return author; } public void setPress(String press) { this.press = press; } public String getPress() { return press; }}

 八、创建三层架构对应模块的类和接口

src/main/java下创建com.itheima.dao包，创建BookMapper接口

1-2 BookMapper.java

package com.itheima.dao;import com.itheima.domain.Book;public interface BookMapper { public Book findBookById(Integer id);}

同目录下创建其映射文件

1-3BookMapper.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.itheima.dao.BookMapper"> <!--根据id查询图书信息 --> <select id="findBookById" parameterType="int" resultType="com.itheima.domain.Book"> select * from tb_book where id = #{id} </select></mapper>

     src/main/java下创建com.itheima.service包，创建BookService接口

        1-4 BookService.java

package com.itheima.service;import com.itheima.domain.Book;public interface BookService { Book findBookById(Integer id);}

src/main/java下创建com.itheima.service.Impl包,创建实现类BookServiceImpl

1-5 BookServiceImpl.java

package com.itheima.service.impl;import com.itheima.dao.BookMapper;import com.itheima.domain.Book;import com.itheima.service.BookService;import org.springframework.beans.factory.annotation.Autowired;import org.springframework.stereotype.Service;@Servicepublic class BookServiceImpl implements BookService { @Autowired private BookMapper bookMapper; public Book findBookById (Integer id) { return bookMapper.findBookById(id); }}

src/main/java下创建com.itheima.controller包,创建BookController处理器类

1-5 BookController.java

package com.itheima.controller;import com.itheima.domain.Book;import com.itheima.service.BookService;import org.springframework.beans.factory.annotation.Autowired;import org.springframework.stereotype.Controller;import org.springframework.web.bind.annotation.RequestMapping;import org.springframework.web.servlet.ModelAndView;@Controllerpublic class BookController { @Autowired private BookService bookService; @RequestMapping("/book") public ModelAndView findBookById(Integer id) { Book book=bookService.findBookById(id); ModelAndView modelAndView=new ModelAndView(); modelAndView.setViewName("book.jsp"); modelAndView.addObject("book",book); return modelAndView; }}

九、Spring和Mybatis的整合

1、spring的配置文件：

src/main/resources目录下创建application-service.xml配置文件

2-1 application-service.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 http://www.springframework.org/schema/context/spring-context.xsd "> <context:component-scan base-package="com.itheima.service"/></beans>

2、Spring和Mybatis的整合配置

src/main/resources目录下创建属性源文件jdbc.properties,用于配置MySQL数据库

2-2 jdbc.properties

jdbc.driverClassName=com.mysql.cj.jdbc.Driverjdbc.url=jdbc:mysql://localhost:3306/ssm?useUnicode=true\ &characterEncoding=utf-8&serverTimezone=Asia/Shanghaijdbc.username=rootjdbc.password=123456

src/main/resources目录下创建application-dao.xml配置信息

2-3 application-dao.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 http://www.springframework.org/schema/context/spring-context.xsd "> <context:property-placeholder location="classpath:jdbc.properties"/> <bean id="dataSource" class="com.alibaba.druid.pool.DruidDataSource"> <property name="driverClassName" value="${jdbc.driverClassName}"/> <property name="url" value="${jdbc.url}"/> <property name="username" value="${jdbc.username}"/> <property name="password" value="${jdbc.password}"/> </bean> <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean"> <property name="dataSource" ref="dataSource"/> </bean> <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer"> <property name="basePackage" value="com.itheima.dao"/> </bean></beans>

3、整合测试

src/test/java中创建BookServiceTest类

2-4BookServiceTest.java

import com.itheima.domain.Book;import com.itheima.service.BookService;import org.junit.Test;import org.junit.runner.RunWith;import org.springframework.beans.factory.annotation.Autowired;import org.springframework.test.context.ContextConfiguration;import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;@RunWith(SpringJUnit4ClassRunner.class)@ContextConfiguration(locations = {"classpath:application-service.xml","classpath:application-dao.xml"})public class BookServiceTest {@Autowired private BookService bookService;@Test public void findBookById(){ Book book=bookService.findBookById(2); System.out.println("id:"+book.getId()); System.out.println("name:"+book.getName()); System.out.println("author:"+book.getAuthor()); System.out.println("press:"+book.getPress());}}

4、测试结果

测试成功：

九、Spring和SpringMVC整合

1、Spring的配置

在项目webapp/WEB-INF的web.xml中输入以下代码

3-1 web.xml

<?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"> <context-param> <param-name>contextConfigLocation</param-name> <param-value>classpath:application-*.xml</param-value> </context-param> <listener> <listener-class> org.springframework.web.context.ContextLoaderListener </listener-class> </listener> <servlet> <servlet-name>DispatcherServlet</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> <servlet-mapping> <servlet-name>DispatcherServlet</servlet-name> <url-pattern>/</url-pattern> </servlet-mapping></web-app>

2、SpringMVC的配置

src/main/resources目录下创建Spring-mvc.xml配置信息

 3-2 spring-mvc.xml

<?xml version="1.0" encoding="UTF-8"?><beans xmlns="http://www.springframework.org/schema/beans" xmlns:context="http://www.springframework.org/schema/context" xmlns:mvc="http://www.springframework.org/schema/mvc" 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"> <context:component-scan base-package="com.itheima.controller"/> <mvc:annotation-driven/></beans>

3、SSM框架整合测试

src/main/webapp下创建book.jsp文件

3-4 book.jsp

<%@ page contentType="text/html;charset=UTF-8" language="java" %><html><head> <title>图书信息查询</title></head><body><table border="1"><tr> <th>图书id</th> <th>图书名称</th> <th>出版社</th> <th>作者</th></tr><tr> <td>${book.id}</td> <td>${book.name}</td> <td>${book.press}</td> <td>${book.author}</td></tr></table></body></html>

启动Tomcat8，在浏览器输入

http://localhost:8082/SSM_war_exploded/book?id=1

 其中8082为端口号，我的填的是8082，默认是8080，根据自己的配置改就行！

 结果：

十、注意事项及其BUG反馈

1、控制台中文乱码解决办法：

Settings->Editor->File Encodings->三个部分如图都改为GBK即可

 2、Mysql数据库中文乱码解决办法：

修改数据库字符集 :

alter database SSM default convert to character set utf8;

 3、服务器日志中文乱码解决办法：

找到对应的Tomcat-8存储地址，在conf中找到

logging.properties文件，将全部GBk替换成UTF-8即可

4、出现no appropriate protocal 异常报错

找到对应位置jdk，把java.security中的

dk.tls.disabledAlgorithms=后的SSLv3，TLSv1，TLSv1.1删除，

如图大概在724行，删除后如图：

 5、出现java.lang.NoClassDefFoundError：javax/severlet/报错

是由于Tomcat高版本不支持4.0版本的Sevrlet导致，更换低版本Tomcat即可

十一、总结

  总体来说，当开始着手一个WEB项目时，总会由于各种原因导致各种BUG，需要花费大量的时间去排查和调试，才能一步步把最后的项目运行出来，因此需要考虑的方面有很多，重要的是必须看懂编译器报错的原因，从而分析出可行的解决办法。

 只有不断的鞭策自己去实践和学习，积累Debug的能力和经验，才能慢慢获得进步！

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