简单易懂:SSM入门级项目整合实例教程+附项目源码

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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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