2022.01.20 1229

2025-09-06 20:01:39 +08:00 · 2022-01-20 14:56:41 +08:00
parent e55312ab41
commit 701a08fd9e
1 changed files with 403 additions and 1 deletions
--- a/张博凯的Java学习笔记.md
+++ b/张博凯的Java学习笔记.md
@@ -1528,6 +1528,8 @@ password=111111

 ##### 导入PageHelper依赖

+<span id="PageHelper依赖"></span>
+
 https://mvnrepository.com/artifact/com.github.pagehelper/pagehelper/5.3.0

 ```xml
@@ -1606,6 +1608,8 @@ https://mvnrepository.com/artifact/com.github.pagehelper/pagehelper/5.3.0

 ##### log4j依赖

+<span id="log4j依赖"></span>
+
 https://mvnrepository.com/artifact/log4j/log4j/1.2.17

 ```xml
@@ -1621,6 +1625,8 @@ https://mvnrepository.com/artifact/log4j/log4j/1.2.17

 ##### 导入log4j.propertites文件

+<span id="导入log4j_propertites文件"></span>
+
 [log4j.properties](张博凯的Java学习笔记.assets\file\log4j.properties) 

 src/main/resources/log4j.properties
@@ -3523,12 +3529,408 @@ public class SpringUserTest {
 }
 ```

+> 通过@RunWith，声明当前测试类位于Spring容器管理
+>
+> 通过@ContextConfiguration声明加载配置文件
+
 运行结果

 ![image-20220120005858883](张博凯的Java学习笔记.assets/image-20220120005858883.png)



+#### TKMapper快速开发
+
+> tk.mapper是mybatis第三方提供的一个插件。简化接口，不需要映射文件
+
+##### 导入依赖
+
+> 基于上一个项目（Spring整合MyBatis）
+
+https://mvnrepository.com/artifact/tk.mybatis/mapper/4.1.5
+
+```xml
+<!-- https://mvnrepository.com/artifact/tk.mybatis/mapper -->
+<dependency>
+    <groupId>tk.mybatis</groupId>
+    <artifactId>mapper</artifactId>
+    <version>4.1.5</version>
+</dependency>
+```
+
+##### 修改Spring的核心配置文件
+
+**去掉以下部分**
+
+```xml
+<!-- mapper文件的路径 -->
+<property name="mapperLocations" value="mappers/*Mapper.xml"></property>
+<!-- [可选] 取别名：类名首字母小写 -->
+<property name="typeAliasesPackage" value="org.example"></property>
+<!-- [可选] MyBatis配置文件 -->
+<!-- <property name="configLocation" value="classpath:mybatis-config.xml"></property> -->
+```
+
+**修改以下部分**
+
+```xml
+<!-- 配置mapper -->
+<bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
+```
+
+改为
+
+```xml
+<!-- 配置mapper -->
+<bean class="tk.mybatis.spring.mapper.MapperScannerConfigurer">
+```
+
+![image-20220120111645093](张博凯的Java学习笔记.assets/image-20220120111645093.png)
+
+##### 删除映射文件
+
+src/main/resources/mappers/
+
+##### 实体类添加注解
+
+src/main/java/org/example/entity/User.java
+
+```java
+package org.example.entity;
+
+import lombok.AllArgsConstructor;
+import lombok.Data;
+import lombok.NoArgsConstructor;
+import tk.mybatis.mapper.annotation.KeySql;
+
+import javax.persistence.Id;
+import javax.persistence.Table;
+
+@Data
+@AllArgsConstructor
+@NoArgsConstructor
+@Table(name = "user") // 对应数据库表名
+public class User {
+    /* ***** 如果表中字段名和实体类中属性名一致，就可以直接测试 ***** */
+    @Id // 主键
+    @KeySql(useGeneratedKeys = true) // 自增
+    private Integer user_id;
+    private String user_name;
+    private String user_pwd;
+    private String user_realname;
+    private Integer user_age;
+
+    /* 其实写成驼峰命名，经测试也可以 */
+    @Id // 主键
+    @KeySql(useGeneratedKeys = true) // 自增
+    private Integer userId;
+    private String userName;
+    private String userPwd;
+    private String userRealname;
+    private Integer userAge;
+
+    /* ***** 如果表中字段名和实体类中属性名不一致，需要谈价@Column注解 ***** */
+    @Id // 主键
+    @KeySql(useGeneratedKeys = true) // 自增
+    @Column(name = "user_id")
+    private Integer id;
+    @Column(name = "user_name")
+    private String name;
+    @Column(name = "user_pwd")
+    private String pwd;
+    @Column(name = "user_realname")
+    private String realname;
+    @Column(name = "user_age")
+    private Integer age;
+}
+```
+
+##### mapper接口改为extends，接口函数删掉
+
+src/main/java/org/example/mapper/UserMapper.java
+
+```java
+package org.example.mapper;
+
+import org.example.entity.User;
+import tk.mybatis.mapper.common.Mapper;
+
+public interface UserMapper extends Mapper<User> {
+    
+}
+```
+
+###### 测试类
+
+```java
+package org.example.test;
+
+import org.example.entity.User;
+import org.example.mapper.UserMapper;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.springframework.test.context.ContextConfiguration;
+import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;
+
+import javax.annotation.Resource;
+import java.util.List;
+
+@RunWith(SpringJUnit4ClassRunner.class)
+@ContextConfiguration("classpath:applicationContext.xml")
+public class SpringUserTest {
+    // 需要调用接口中的方法进行测试
+    @Resource
+    private UserMapper userMapper;
+
+    @Test
+    public void show() {
+        List<User> users = userMapper.selectAll();
+        for (User user : users) {
+            System.out.println(user);
+        }
+    }
+}
+```
+
+运行结果
+
+```bash
+User(user_id=1, user_name=小明, user_pwd=13579, user_realname=张小明, user_age=20)
+User(user_id=2, user_name=ad, user_pwd=asda, user_realname=dasd, user_age=48)
+
+Process finished with exit code 0
+```
+
+
+
+#### Spring整合MyBatis整合log4j
+
+> 基于上一个项目（TKMapper快速开发）
+
+##### 导入依赖
+
+[log4j](#log4j依赖)、commons-logging、slf4j-log4j12
+
+**导入commons-logging依赖**
+
+https://mvnrepository.com/artifact/commons-logging/commons-logging/1.2
+
+```xml
+<!-- https://mvnrepository.com/artifact/commons-logging/commons-logging -->
+<dependency>
+    <groupId>commons-logging</groupId>
+    <artifactId>commons-logging</artifactId>
+    <version>1.2</version>
+</dependency>
+```
+
+**导入slf4j-log4j12依赖**
+
+https://mvnrepository.com/artifact/org.slf4j/slf4j-log4j12/1.7.25
+
+```xml
+<!-- https://mvnrepository.com/artifact/org.slf4j/slf4j-log4j12 -->
+<dependency>
+    <groupId>org.slf4j</groupId>
+    <artifactId>slf4j-log4j12</artifactId>
+    <version>1.7.25</version>
+    <scope>test</scope>
+</dependency>
+```
+
+##### 添加log4j配置文件
+
+[导入log4j.propertites文件](#导入log4j_propertites文件)
+
+进行测试，日志成功输出
+
+![image-20220120115301780](张博凯的Java学习笔记.assets/image-20220120115301780.png)
+
+
+
+#### Spring和MyBatis整合后pageHelper分页插件的使用
+
+##### 导入依赖
+
+[导入PageHelper依赖](#PageHelper依赖)
+
+##### 在Spring核心配置文件中配置拦截器
+
+https://github.com/pagehelper/Mybatis-PageHelper/blob/master/wikis/zh/HowToUse.md
+
+src/main/resources/applicationContext.xml
+
+```xml
+<bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
+  ...
+  <!-- pageHelper分页插件拦截器 -->
+  <property name="plugins">
+    <array>
+      <bean class="com.github.pagehelper.PageInterceptor">
+        <property name="properties">
+          <!--使用下面的方式配置参数，一行配置一个 -->
+          <value>
+            params=value1
+          </value>
+        </property>
+      </bean>
+    </array>
+  </property>
+</bean>
+```
+
+##### 测试类
+
+src/test/java/org/example/test/SpringUserTest.java
+
+```java
+package org.example.test;
+
+import com.github.pagehelper.PageHelper;
+import com.github.pagehelper.PageInfo;
+import org.example.entity.User;
+import org.example.mapper.UserMapper;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.springframework.test.context.ContextConfiguration;
+import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;
+
+import javax.annotation.Resource;
+import java.util.List;
+
+@RunWith(SpringJUnit4ClassRunner.class)
+@ContextConfiguration("classpath:applicationContext.xml")
+public class SpringUserTest {
+    // 需要调用接口中的方法进行测试
+    @Resource
+    private UserMapper userMapper;
+
+    @Test
+    public void show() {
+        // 设置当前页，页面容量
+        PageHelper.startPage(1,3);
+        List<User> users = userMapper.selectAll();
+        PageInfo<User> userPageInfo = new PageInfo<>(users);
+        System.out.println(userPageInfo);
+    }
+}
+```
+
+
+
+运行结果
+
+```bash
+PageInfo{pageNum=1, pageSize=3, size=3, startRow=1, endRow=3, total=5, pages=2, list=Page{count=true, pageNum=1, pageSize=3, startRow=0, endRow=3, total=5, pages=2, reasonable=false, pageSizeZero=false}[User(id=1, name=小明, pwd=13579, realname=张小明, age=20), User(id=2, name=ad, pwd=asda, realname=dasd, age=48), User(id=3, name=vb, pwd=13579, realname=张小明, age=20)], prePage=0, nextPage=2, isFirstPage=true, isLastPage=false, hasPreviousPage=false, hasNextPage=true, navigatePages=8, navigateFirstPage=1, navigateLastPage=2, navigatepageNums=[1, 2]}
+```
+
+
+
+#### AOP注解事务的使用
+
+##### 导入依赖
+
+spring-aspects
+
+https://mvnrepository.com/artifact/org.springframework/spring-aspects/5.2.19.RELEASE
+
+```xml
+<!-- https://mvnrepository.com/artifact/org.springframework/spring-aspects -->
+<dependency>
+    <groupId>org.springframework</groupId>
+    <artifactId>spring-aspects</artifactId>
+    <version>5.2.19.RELEASE</version>
+</dependency>
+```
+
+
+
+##### 修改Spring的核心配置文件
+
+修改文件头，添加事务管理器配置
+
+```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"
+       xmlns:tx="http://www.springframework.org/schema/tx"
+       xsi:schemaLocation="
+       http://www.springframework.org/schema/context
+       http://www.springframework.org/schema/context/spring-context.xsd
+       http://www.springframework.org/schema/tx
+       http://www.springframework.org/schema/tx/spring-tx.xsd
+       http://www.springframework.org/schema/beans
+       http://www.springframework.org/schema/beans/spring-beans.xsd">
+
+    ...
+
+    <!-- 事务管理器 -->
+    <bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
+        <property name="dataSource" ref="dataSource"></property>
+    </bean>
+
+    <!-- 声明使用注解配置 -->
+    <context:annotation-config></context:annotation-config>
+
+    <!-- 扫描范围 -->
+    <context:component-scan base-package="org.example"></context:component-scan>
+
+    <!-- 注解事务管理配置 -->
+    <tx:annotation-driven></tx:annotation-driven>
+</beans>
+```
+
+##### 应用
+
+创建UserService
+
+src/main/java/org/example/service/UserService.java
+
+```java
+package org.example.service;
+
+import org.springframework.stereotype.Service;
+import org.springframework.transaction.annotation.Propagation;
+import org.springframework.transaction.annotation.Transactional;
+
+@Service
+public class UserService {
+    @Transactional(propagation = Propagation.REQUIRED)
+    public void addUser() {
+        System.out.println("增加");
+    }
+    @Transactional(propagation = Propagation.REQUIRED)
+    public int updateUser() {
+        return 1;
+    }
+    @Transactional(propagation = Propagation.SUPPORTS) // 查询不需要事务
+    public int selectUser() {
+        return 1;
+    }
+}
+```
+
+>**Spring中七种Propagation类的事务属性详解**
+>
+> REQUIRED：支持当前事务，如果当前没有事务，就新建一个事务。这是最常见的选择。 
+>
+> SUPPORTS：支持当前事务，如果当前没有事务，就以非事务方式执行。 
+>
+> MANDATORY：支持当前事务，如果当前没有事务，就抛出异常。 
+>
+> REQUIRES_NEW：新建事务，如果当前存在事务，把当前事务挂起。 
+>
+> NOT_SUPPORTED：以非事务方式执行操作，如果当前存在事务，就把当前事务挂起。 
+>
+> NEVER：以非事务方式执行，如果当前存在事务，则抛出异常。 
+>
+> NESTED：支持当前事务，如果当前事务存在，则执行一个嵌套事务，如果当前没有事务，就新建一个事务。
+
+> REQUIRED和SUPPORTS用的较多。REQUIRED→增删改，SUPPORTS→查
+
+
+
 ### SpringMVC框架

 > Web框架，Servlet角色