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
- 扫描控制器
- 配置视图解析器
- <!--两个标准配置 -->
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
<!-- 将springmvc不能处理的请求交给tomcat -->
<!-- 能支持springmvc更高级的一些功能-->
- 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<!-- 切入点表达式 *表示返回值类型 ,表示com.cn.crud.service包下的,..表示即使有子包仍然可以,表达式表达的是该包下的所有方法都能切入事务-->
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>
<!-- 配置数据库连接 -->
<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><!-- 指定javaBean生成的位置 -->
<javaModelGenerator targetPackage="com.atguigu.crud.bean"
targetProject=".\src\main\java">
<property name="enableSubPackages" value="true" />
<property name="trimStrings" value="true" />
</javaModelGenerator><!--指定sql映射文件生成的位置 -->
<sqlMapGenerator targetPackage="mapper" targetProject=".\src\main\resources">
<property name="enableSubPackages" value="true" />
</sqlMapGenerator><!-- 指定dao接口生成的位置,mapper接口 -->
<javaClientGenerator type="XMLMAPPER"
targetPackage="com.atguigu.crud.dao" targetProject=".\src\main\java">
<property name="enableSubPackages" value="true" />
</javaClientGenerator>
<!-- table指定每个表的生成策略 -->
<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
<!-- https://mvnrepository.com/artifact/org.springframework/spring-test -->
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-test</artifactId>
<version>5.1.3.RELEASE</version>
<scope>test</scope>
</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", "Jerry@atguigu.com", 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", "Jerry@atguigu.com", 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