SSM框架整合01 基础环境搭建

SSM整合快速开发CRUD 准备工作 创建Maven工程，引入依赖

        
        
            org.springframework
            spring-webmvc
            4.3.7.RELEASE
        

        
        
        
            org.springframework
            spring-jdbc
            4.3.7.RELEASE
        
        
        
            org.springframework
            spring-aspects
            4.3.7.RELEASE
        

        
        
            org.mybatis
            mybatis
            3.4.2
        

        
        
            org.mybatis
            mybatis-spring
            1.3.1
        

        
        
            com.mchange
            c3p0
            0.9.2
        

        
        
            mysql
            mysql-connector-java
            8.0.27
        

        
        
            jstl
            jstl
            1.2
        

为了减少不必要的麻烦，版本于教程一致。servlet-api和junit的依赖在idea创建时自动引入

引入Bootstrap前端框架

下载：https://v3.bootcss.com/

解压后放入static目录下

根据网站的提示进行引入，下载页下方有基本模板

<%@ page contentType="text/html; charset=UTF-8" pageEncoding="UTF-8" %>



    
    
    




成功

创建数据库及表结构

create DATABASE ssm_crud

create table tbl_emp(
emp_id int(11) primary key auto_increment,
emp_name varchar(255) not null,
gender char(1),
email varchar(255),
d_id int(11),
foreign key(d_id) references tbl_dept(dept_id)
)

create table tbl_dept(
dept_id int(11) primary key auto_increment,
dept_name varchar(255) not null
)

编写ssm整合的关键配置文件 web.xml

    
    
    
        contextConfigLocation
        classpath:applicationContext.xml
    

    
    
        org.springframework.web.context.ContextLoaderListener
    

    
    
        characterEncodingFilter
        org.springframework.web.filter.CharacterEncodingFilter
        
            encoding
            UTF-8
        
        
            forceRequestEncoding
            true
        
        
            forceResponseEncoding
            true
        
    
    
        characterEncodingFilter
        /*
    

    
    
    
        dispatcherServlet
        org.springframework.web.servlet.DispatcherServlet
        1
    
    
        dispatcherServlet
        /
    

    
    
        hiddenHttpMethodFilter
        org.springframework.web.filter.HiddenHttpMethodFilter
    
    
        hiddenHttpMethodFilter
        /*
    

配置SpringMVC

dispatcherServlet-servlet.xml

配置Spring

applicationContext.xml

配置MyBatis

使用MyBatis的逆向工程生成对应的bean和mapper

mybatis generator插件地址

GitHub - mybatis/generator: A code generator for MyBatis.https://github.com/mybatis/generator

引入依赖

        
        
            org.mybatis.generator
            mybatis-generator-core
            1.3.5
        

创建逆向工程的配置文件

文件名为mbg.xml

运行如下单元测试方法

    @Test
    public void test() throws XMLParserException, IOException, InvalidConfigurationException, SQLException, InterruptedException {
        List warnings = new ArrayList();
        boolean overwrite = true;
        File configFile = new File("src/main/resources/mbg.xml");
        ConfigurationParser cp = new ConfigurationParser(warnings);
        Configuration config = cp.parseConfiguration(configFile);
        DefaultShellCallback callback = new DefaultShellCallback(overwrite);
        MyBatisGenerator myBatisGenerator = new MyBatisGenerator(config, callback, warnings);
        myBatisGenerator.generate(null);
    }

生成成功，目录结构如下

修改生成的文件

为EmployeeMapper接口新增两个方法

在Employee实体类中新增属性

并提供get，set方法

两实体类新增有参,无参构造器

在EmployeeMapper.xml中添加新增方法的实现

mybatis-config.xml

Spring的单元测试

可以自动注入我们需要的组件

引入依赖

        
        
            org.springframework
            spring-test
            4.3.7.RELEASE
        

 用法

@RunWith(SpringJUnit4ClassRunner.class)
//指定Spring配置文件的位置
@ContextConfiguration(locations = "classpath:applicationContext.xml")
public class WhateverTest {
    @Autowired
    DepartmentMapper departmentMapper;

    @Autowired
    EmployeeMapper employeeMapper;

    @Test
    public void test() {
        //插入几个部门
        departmentMapper.insertSelective(new Department(null, "删库部"));
        departmentMapper.insertSelective(new Department(null, "跑路部"));

        //生成员工数据
        employeeMapper.insertSelective(new Employee(null, "GYQ", "男", "[email protected]", 1));
        employeeMapper.insertSelective(new Employee(null, "GYY", "男", "[email protected]", 2));
    }
}

原来的方式

批量插入员工数据

在applicationContext.xml文件中配置一个可执行批量的sqlSession

测试

@RunWith(SpringJUnit4ClassRunner.class)
@ContextConfiguration(locations = "classpath:applicationContext.xml")
public class WhateverTest {
    @Autowired
    SqlSession sqlSession;

    @Test
    public void test() {
        //批量插入多个员工，使用可以执行批量 *** 作的sqlSession
        EmployeeMapper mapper = sqlSession.getMapper(EmployeeMapper.class);
        for (int i = 0; i < 1000; i++) {
            String name = UUID.randomUUID().toString().substring(0, 5) + "" + i;
            mapper.insertSelective(new Employee(null,name,"男",name+"@test.com",(int)(Math.random()*2+1)));
        }
        System.out.println("批量添加完成");
    }
}