有很长一段时间没学习Java了 主要是懒,然后打上了游戏,今天 重新 回归学习。楠哥教你学Java ,我跟他学的。下面是我的听课笔记。
这次学的是 逆向工程,我的理解就是 : 一键生成工具…虽然不是鼠标点点两下就出来了,但是也是写了一些代码,它就飙出来了 也是挺好用。
- 首先:
- 为此我重新创了一个项目。(红色圈起来的是自己写的 剩下的entity和repository是自动生成的)
-
pom.xml文件
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>com.southwind</groupId>
<artifactId>aimgb</artifactId>
<version>1.0-SNAPSHOT</version>
<dependencies>
<dependency>
<groupId>org.mybatis</groupId>
<artifactId>mybatis</artifactId>
<version>3.5.3</version>
</dependency>
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>8.0.19</version>
</dependency>
<dependency>
<groupId>org.mybatis.generator</groupId>
<artifactId>mybatis-generator-core</artifactId>
<version>1.3.2</version>
</dependency>
</dependencies>
</project>
<?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="testTables" targetRuntime="MyBatis3">
<jdbcConnection driverClass="com.mysql.cj.jdbc.Driver"
connectionURL="jdbc:mysql://.......?useUnicode=true&characterEncoding=UTF-8"
userId=""
password=""
></jdbcConnection>
<javaModelGenerator targetPackage="com.southwind.entity" targetProject="./src/main/java"></javaModelGenerator>
<sqlMapGenerator targetPackage="com.southwind.repository" targetProject="./src/main/java"></sqlMapGenerator>
<javaClientGenerator type="XMLMAPPER" targetPackage="com.southwind.repository" targetProject="./src/main/java"></javaClientGenerator>
<table tableName="goods" domainObjectName="Goods"></table>
</context>
</generatorConfiguration>
package com.southwind.test;
import org.mybatis.generator.api.MyBatisGenerator;
import org.mybatis.generator.config.Configuration;
import org.mybatis.generator.config.xml.ConfigurationParser;
import org.mybatis.generator.exception.InvalidConfigurationException;
import org.mybatis.generator.exception.XMLParserException;
import org.mybatis.generator.internal.DefaultShellCallback;
import java.io.File;
import java.io.IOException;
import java.sql.SQLException;
import java.util.ArrayList;
import java.util.List;
public class Main {
public static void main(String[] args) {
List<String> warings = new ArrayList<String>();
boolean overwrite = true ;
String genCig = "/generatorConfig.xml";
File configFile = new File(Main.class.getResource(genCig).getFile());
ConfigurationParser configurationParser = new ConfigurationParser(warings);
Configuration configuration = null ;
try {
configuration = configurationParser.parseConfiguration(configFile);
} catch (IOException e) {
e.printStackTrace();
} catch (XMLParserException e) {
e.printStackTrace();
}
DefaultShellCallback callback = new DefaultShellCallback(overwrite);
MyBatisGenerator myBatisGenerator = null;
try {
myBatisGenerator = new MyBatisGenerator(configuration,callback,warings);
} catch (InvalidConfigurationException e) {
e.printStackTrace();
}
try {
myBatisGenerator.generate(null);
} catch (SQLException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
} catch (InterruptedException e) {
e.printStackTrace();
}
}
}
然后运行完成就像我的文件目录一样了,有没有感觉贼少的代码。感觉复制粘贴上去就可以了,还挺好用。