SSM框架搭建过程

SSM框架搭建过程
1. 引入依赖的jar包（pom.xml）
```
a.   spring-webmvc
```
```
b.   spring-jdbc
```
```
c.   spring-aspects
```
```
d.   mybatis
```
```
e.   mybatis-spring
```
```
f.   c3p0  mysql-connector-java
```
```
g.   jstl  javax.servlet-api
```
```
h. <!— MBG-->  mybatis-generator-core
```
```
i. <!— junit-->  junit
```
1. webapp/WEB-INF/web.xml 中
2. src/main/resources目录下新建applicationContext.xml
3. 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
```



1. 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
1. 配置MyBatis在mybatis-config.xml中
2. 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
3. mbg.xml文件
4. <?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=".srcmainjava">
  <property name="enableSubPackages" value="true" />
  <property name="trimStrings" value="true" />
  </javaModelGenerator>
  
  
  <sqlMapGenerator targetPackage="mapper" targetProject=".srcmain esources">
  <property name="enableSubPackages" value="true" />
  </sqlMapGenerator>
  
  
  <javaClientGenerator type="XMLMAPPER"
  targetPackage="com.atguigu.crud.dao" targetProject=".srcmainjava">
  <property name="enableSubPackages" value="true" />
  </javaClientGenerator>
  
  
  <table tableName="tbl_emp" domainObjectName="Employee"></table>
  <table tableName="tbl_dept" domainObjectName="Department"></table>
  </context>
  </generatorConfiguration>
5. 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);

     }

}
1. 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



<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
```


<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
1. 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
```
```


<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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原文地址：https://www.cnblogs.com/cn-chy-com/p/11131155.html

SSM框架搭建过程

14. rest风格的URI