SSM框架搭建过程

引入依赖的jar包（pom.xml）

a. <!--Spring SpringMVC相关-->  spring-webmvc

b. <!--Spring事务-->  spring-jdbc

c. <!--面向切面编程-->  spring-aspects

d. <!--mybatis-->  mybatis

e. <!--mybatis 整合 spring-->  mybatis-spring

f. <!--数据库连接池、驱动-->  c3p0  mysql-connector-java

g. <!--jstl,servlet-api-->  jstl  javax.servlet-api

h. <!— MBG-->  mybatis-generator-core

i. <!— junit-->  junit

webapp/WEB-INF/web.xml 中
src/main/resources目录下新建applicationContext.xml
web.xml同级目录下新建dispatcherServlet-servlet.xml并配置
1. 扫描控制器
2. 配置视图解析器
3.

a. 服务器一启动就启动Spring 容器

b. springMVC前端控制器

c. 字符编码过滤器，一定要放在所有过滤器之前

d. 使用Rest风格的URI，将页面普通的post请求转为指定的

delete或者put请求

配置Spring在applicationContext.xml中

a. 扫描除控制器以外的其他组件

b. 配置数据源（同时将dbconfig.properties文件导入到resources目录下）

c. 配置和MyBatis的整合，同时在src/main/resources下创建mybaitis的配置文件mybatis-config.xml以及mapper文件夹

d. 配置扫描器，将mybatis接口的实现加入到ioc容器中

e. 配置一个可以执行批量的sqlSession

f. 配置事务控制

g. xml配置事务

h. 配置事务增强，事务如何切入

配置MyBatis在mybatis-config.xml中
在当前工程下创建mbg.xml进行配置，使用mybatis 逆向工程生成对应的bean 、dao和 mapper
mbg.xml文件
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE generatorConfiguration
PUBLIC "-//mybatis.org//DTD MyBatis Generator Configuration 1.0//EN"
"http://mybatis.org/dtd/mybatis-generator-config_1_0.dtd">
<generatorConfiguration>

<context id="DB2Tables" targetRuntime="MyBatis3">
<commentGenerator>
<property name="suppressAllComments" value="true" />
</commentGenerator>

<jdbcConnection driverClass="com.mysql.jdbc.Driver"
connectionURL="jdbc:mysql://localhost:3306/ssm_crud" userId="root"
password="123456">
</jdbcConnection>

<javaTypeResolver>
<property name="forceBigDecimals" value="false" />
</javaTypeResolver>


<javaModelGenerator targetPackage="com.atguigu.crud.bean"
targetProject=".\src\main\java">
<property name="enableSubPackages" value="true" />
<property name="trimStrings" value="true" />
</javaModelGenerator>


<sqlMapGenerator targetPackage="mapper" targetProject=".\src\main\resources">
<property name="enableSubPackages" value="true" />
</sqlMapGenerator>


<javaClientGenerator type="XMLMAPPER"
targetPackage="com.atguigu.crud.dao" targetProject=".\src\main\java">
<property name="enableSubPackages" value="true" />
</javaClientGenerator>


<table tableName="tbl_emp" domainObjectName="Employee"></table>
<table tableName="tbl_dept" domainObjectName="Department"></table>
</context>
</generatorConfiguration>
Mybatis逆向工程测试

public class MBGTest {

public static void main(String[] args) throws Exception {

List<String> warnings = new ArrayList<String>();

boolean overwrite = true;

File configFile = new File("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);

}

修改mapper文件

其中，<resultMap id="BaseResultMap_Dept" type="com.cn.crud.bean.Employee">
<result column="emp_id" jdbcType="INTEGER" property="empId" />
<result column="emp_name" jdbcType="VARCHAR" property="empName" />
<result column="emp_gender" jdbcType="CHAR" property="empGender" />
<result column="emp_email" jdbcType="VARCHAR" property="empEmail" />
<result column="d_id" jdbcType="INTEGER" property="dId" />
<association

property="department" javaType="com.cn.crud.bean.Department">
<id column="dept_id" property="deptId"/>
<result column="dept_name" property="deptName"/>
</association>

</resultMap>

<association> 关联查询，了解

10. * 测试dao层的工作

*推荐Spring的项目就可以使用Spring的单元测试，可以自动注入我们需要的组件

*1、导入SpringTest模块

在pom.xml中引入spring-test依赖

<groupId>org.springframework</groupId>

<artifactId>spring-test</artifactId>

<version>5.1.3.RELEASE</version>

</dependency>

*2、@ContextConfiguration指定Spring配置文件的位置

*3、直接autowired要使用的组件即可

@RunWith(SpringJUnit4ClassRunner.class)

@ContextConfiguration(locations={"classpath:applicationContext.xml"})

public class MapperTest {

@Autowired

DepartmentMapper departmentMapper;

@Autowired

EmployeeMapper employeeMapper;

@Autowired

SqlSession sqlSession;

/**

* 测试DepartmentMapper

@Test

public void testCRUD(){

/* //1、创建SpringIOC容器

ApplicationContext ioc = new ClassPathXmlApplicationContext("applicationContext.xml");

//2、从容器中获取mapper

DepartmentMapper bean = ioc.getBean(DepartmentMapper.class);*/

System.out.println(departmentMapper);

//1、插入几个部门

// departmentMapper.insertSelective(new Department(null, "开发部"));

// departmentMapper.insertSelective(new Department(null, "测试部"));

//2、生成员工数据，测试员工插入

employeeMapper.insertSelective(new Employee(null, "Jerry", "M", "[email protected]", 1));

//3、批量插入多个员工；批量，使用可以执行批量操作的sqlSession。

// for(){

// employeeMapper.insertSelective(new Employee(null, , "M", "[email protected]", 1));

// }

EmployeeMapper mapper = sqlSession.getMapper(EmployeeMapper.class);

for(int i = 0;i<1000;i++){

String uid = UUID.randomUUID().toString().substring(0,5)+i;

mapper.insertSelective(new Employee(null,uid, "M", uid+"@atguigu.com", 1));

}

System.out.println("批量完成");

}

11. 分页使用插件pagehelper

需要在pom.xml中引入依赖

<!-- https://mvnrepository.com/artifact/com.github.pagehelper/pagehelper -->

<dependency>

  <groupId>com.github.pagehelper</groupId>

  <artifactId>pagehelper</artifactId>

  <version>5.1.8</version>

</dependency>

其他配置查看：

https://github.com/pagehelper/Mybatis-PageHelper/blob/master/wikis/zh/HowToUse.md

12. Spring分页测试代码

@RunWith(SpringJUnit4ClassRunner.class)

@WebAppConfiguration

@ContextConfiguration(locations = { "classpath:applicationContext.xml",

"file:src/main/webapp/WEB-INF/dispatcherServlet-servlet.xml" })

public class MvcTest {

// 传入Springmvc的ioc

@Autowired

WebApplicationContext context;

// 虚拟mvc请求，获取到处理结果。

MockMvc mockMvc;

@Before

public void initMokcMvc() {

mockMvc = MockMvcBuilders.webAppContextSetup(context).build();

}

@Test

public void testPage() throws Exception {

//模拟请求拿到返回值

MvcResult result = mockMvc.perform(MockMvcRequestBuilders.get("/emps").param("pn", "5"))

.andReturn();

//请求成功以后，请求域中会有pageInfo；我们可以取出pageInfo进行验证

MockHttpServletRequest request = result.getRequest();

PageInfo pi = (PageInfo) request.getAttribute("pageInfo");

System.out.println("当前页码："+pi.getPageNum());

System.out.println("总页码："+pi.getPages());

System.out.println("总记录数："+pi.getTotal());

System.out.println("在页面需要连续显示的页码");

int[] nums = pi.getNavigatepageNums();

for (int i : nums) {

System.out.print(" "+i);

}

//获取员工数据

List<Employee> list = pi.getList();

for (Employee employee : list) {

System.out.println("ID："+employee.getEmpId()+"==>Name:"+employee.getEmpName());

}

13. @ResponseBody

 @ResponseBody 可以把返回的对象转换为json串，要想其正常工作需要导入jackson包：jackson-databind

<!-- https://mvnrepository.com/artifact/com.fasterxml.jackson.core/jackson-databind -->

<dependency>

  <groupId>com.fasterxml.jackson.core</groupId>

  <artifactId>jackson-databind</artifactId>

  <version>2.9.8</version>

</dependency>

14. rest风格的URI

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