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Java后台开发之路(1)---IDEA基于maven项目使用m

Java后台开发之路(1)---IDEA基于maven项目使用m

作者: Tsnow308 | 来源:发表于2019-10-23 23:06 被阅读0次

Mybatis-Generator
一、项目结构(前)

01.png

二、数据库准备

SET FOREIGN_KEY_CHECKS=0;
 
-- ----------------------------
-- Table structure for `admin`
-- ----------------------------
DROP TABLE IF EXISTS `admin`;
CREATE TABLE `admin` (
  `Id` int(11) NOT NULL auto_increment,
  `username` varchar(20) default NULL,
  `password` varchar(20) default NULL,
  `name` varchar(20) default NULL,
  PRIMARY KEY  (`Id`)
) ENGINE=InnoDB AUTO_INCREMENT=2 DEFAULT CHARSET=utf8;
 
-- ----------------------------
-- Records of admin
-- ----------------------------
INSERT INTO `admin` VALUES ('1', 'admin', 'admin', '超级管理员');

三、IDEA创建Maven项目
Maven创建Java Web项目

过程步骤可以看上面的博文,里面介绍得很详细。

四、基于此SSM框架实现
SSM框架整合 + Druid数据源 + log4j2 (一)

过程步骤可以看上面的博文,里面介绍得很详细。

五、配置pom.xml
1、添加 <org.mybatis.generator.version>1.3.5</org.mybatis.generator.version>

2、添加 <!-- mybatis-generator -->
<?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.ray</groupId>
  <artifactId>ssm01</artifactId>
  <version>1.0-SNAPSHOT</version>
  <packaging>war</packaging>
 
  <name>ssm01 Maven Webapp</name>
  <!-- FIXME change it to the project's website -->
  <url>http://www.example.com</url>
 
  <properties>
    <mysql.version>5.1.18</mysql.version>
    <com.alibaba.druid.version>1.1.9</com.alibaba.druid.version>
    <com.mybatis.mybatis.version>3.4.1</com.mybatis.mybatis.version>
    <com.mybatis.mybatis_spring.version>1.3.0</com.mybatis.mybatis_spring.version>
    <org.mybatis.generator.version>1.3.5</org.mybatis.generator.version>
    <com.google.gson.version>2.7</com.google.gson.version>
    <javax.servlet.version>3.1.0</javax.servlet.version>
    <org.springframework.version>4.3.2.RELEASE</org.springframework.version>
    <com.dyuproject.protostuff.version>1.0.8</com.dyuproject.protostuff.version>
    <developer.organization><![CDATA[scengine]]></developer.organization>
  </properties>
 
  <dependencies><!-- 远程依赖库 -->
 
    <!--mybatis-generator-->
    <dependency>
      <groupId>org.mybatis.generator</groupId>
      <artifactId>mybatis-generator-core</artifactId>
      <version>1.3.5</version>
    </dependency>
 
    <!-- 0.测试单元 -->
    <dependency>
      <groupId>junit</groupId>
      <artifactId>junit</artifactId>
      <version>4.12</version>
      <scope>test</scope>
    </dependency>
 
    <!-- 1.数据库 -->
    <dependency>
      <groupId>mysql</groupId>
      <artifactId>mysql-connector-java</artifactId>
      <version>${mysql.version}</version>
      <scope>runtime</scope>
    </dependency>
    <!--druid==>阿里巴巴数据库连接池-->
    <dependency>
      <groupId>com.alibaba</groupId>
      <artifactId>druid</artifactId>
      <version>${com.alibaba.druid.version}</version>
    </dependency>
    <!-- DAO: MyBatis -->
    <dependency>
      <groupId>org.mybatis</groupId>
      <artifactId>mybatis</artifactId>
      <version>${com.mybatis.mybatis.version}</version>
    </dependency>
    <dependency>
      <groupId>org.mybatis</groupId>
      <artifactId>mybatis-spring</artifactId>
      <version>${com.mybatis.mybatis_spring.version}</version>
    </dependency>
 
    <!-- 2.Servlet web -->
    <dependency>
      <groupId>taglibs</groupId>
      <artifactId>standard</artifactId>
      <version>1.1.2</version>
    </dependency>
    <dependency>
      <groupId>jstl</groupId>
      <artifactId>jstl</artifactId>
      <version>1.2</version>
    </dependency>
    <dependency>
      <groupId>com.google.code.gson</groupId>
      <artifactId>gson</artifactId>
      <version>${com.google.gson.version}</version>
    </dependency>
    <!--Servlet版本设置-->
    <dependency>
      <groupId>javax.servlet</groupId>
      <artifactId>javax.servlet-api</artifactId>
      <version>${javax.servlet.version}</version>
    </dependency>
 
    <!-- 3.Spring -->
    <!-- 1)Spring核心 -->
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-core</artifactId>
      <version>${org.springframework.version}</version>
    </dependency>
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-beans</artifactId>
      <version>${org.springframework.version}</version>
    </dependency>
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-context</artifactId>
      <version>${org.springframework.version}</version>
    </dependency>
    <!-- 2)Spring DAO层 -->
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-jdbc</artifactId>
      <version>${org.springframework.version}</version>
    </dependency>
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-tx</artifactId>
      <version>${org.springframework.version}</version>
    </dependency>
    <!-- 3)Spring web -->
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-web</artifactId>
      <version>${org.springframework.version}</version>
    </dependency>
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-webmvc</artifactId>
      <version>${org.springframework.version}</version>
    </dependency>
    <!-- 4)Spring test -->
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-test</artifactId>
      <version>${org.springframework.version}</version>
    </dependency>
    <dependency>
      <groupId>com.dyuproject.protostuff</groupId>
      <artifactId>protostuff-core</artifactId>
      <version>${com.dyuproject.protostuff.version}</version>
    </dependency>
    <dependency>
      <groupId>com.dyuproject.protostuff</groupId>
      <artifactId>protostuff-runtime</artifactId>
      <version>${com.dyuproject.protostuff.version}</version>
    </dependency>
 
    <!-- Map工具类 -->
    <dependency>
      <groupId>commons-collections</groupId>
      <artifactId>commons-collections</artifactId>
      <version>3.2.2</version>
    </dependency>
 
    <!-- 文件上传工具 -->
    <dependency>
      <groupId>commons-fileupload</groupId>
      <artifactId>commons-fileupload</artifactId>
      <version>1.3.2</version>
    </dependency>
    <dependency>
      <groupId>commons-io</groupId>
      <artifactId>commons-io</artifactId>
      <version>2.5</version>
    </dependency>
 
    <!-- 日志文件log4j2 -->
    <dependency>
      <groupId>org.apache.logging.log4j</groupId>
      <artifactId>log4j-core</artifactId>
      <version>2.8.2</version>
    </dependency>
    <dependency>
      <groupId>org.apache.logging.log4j</groupId>
      <artifactId>log4j-api</artifactId>
      <version>2.8.2</version>
    </dependency>
    <dependency>
      <groupId>org.apache.logging.log4j</groupId>
      <artifactId>log4j-web</artifactId>
      <version>2.8.2</version>
    </dependency>
 
 
 
  </dependencies>
 
  <build>
    <finalName>ssm01</finalName>
    <pluginManagement><!-- lock down plugins versions to avoid using Maven defaults (may be moved to parent pom) -->
      <plugins>
 
        <!-- mybatis-generator -->
        <plugin>
          <groupId>org.mybatis.generator</groupId>
          <artifactId>mybatis-generator-maven-plugin</artifactId>
          <version>${org.mybatis.generator.version}</version>
          <configuration>
            <verbose>true</verbose>
            <overwrite>true</overwrite>
          </configuration>
 
          <!--
                用maven mybatis插件
                如果不在plugin里面添加依赖包得引用的话,会找不到相关得jar包,
                在plugin外部得jar包,他不会去找到并执行,
                所以要把plugin运行依赖得jar配置都放在里面
                -->
          <dependencies>
            <dependency>
              <groupId>org.mybatis</groupId>
              <artifactId>mybatis</artifactId>
              <version>${com.mybatis.mybatis.version}</version>
            </dependency>
            <dependency>
              <groupId>mysql</groupId>
              <artifactId>mysql-connector-java</artifactId>
              <version>${mysql.version}</version>
            </dependency>
          </dependencies>
        </plugin>
 
        <!-- see http://maven.apache.org/ref/current/maven-core/default-bindings.html#Plugin_bindings_for_war_packaging -->
        <plugin>
          <artifactId>maven-resources-plugin</artifactId>
          <version>3.0.2</version>
        </plugin>
        <plugin>
          <artifactId>maven-compiler-plugin</artifactId>
          <version>3.7.0</version>
        </plugin>
        <plugin>
          <artifactId>maven-surefire-plugin</artifactId>
          <version>2.20.1</version>
        </plugin>
        <plugin>
          <artifactId>maven-war-plugin</artifactId>
          <version>3.2.0</version>
        </plugin>
        <plugin>
          <artifactId>maven-install-plugin</artifactId>
          <version>2.5.2</version>
        </plugin>
        <plugin>
          <artifactId>maven-deploy-plugin</artifactId>
          <version>2.8.2</version>
        </plugin>
      </plugins>
    </pluginManagement>
  </build>
</project>

六、配置generatorConfig.xml

<?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">
<!-- 配置生成器 -->
<generatorConfiguration>
 
    <!-- 加载JDBC配置文件 -->
    <properties resource="jdbc.properties"/>
 
    <!-- context:生成一组对象的环境 -->
    <context id="MyBatis" targetRuntime="MyBatis3" defaultModelType="flat">
 
        <!-- beginningDelimiter和endingDelimiter:指明数据库的用于标记数据库对象名的符号,比如ORACLE就是双引号,MYSQL默认是`反引号; -->
        <property name="beginningDelimiter" value="`"/>
        <property name="endingDelimiter" value="`"/>
 
        <!-- 不生成注解 -->
        <commentGenerator>
            <!-- 这个元素用来去除指定生成的注释中是否包含生成的日期 false:表示保护 -->
            <!-- 如果生成日期,会造成即使修改一个字段,整个实体类所有属性都会发生变化,不利于版本控制,所以设置为true -->
            <property name="suppressDate" value="true" />
            <!-- 是否去除自动生成的注释 true:是 : false:否 -->
            <!--<property name="suppressAllComments" value="true" />-->
        </commentGenerator>
 
        <!--数据库链接URL,用户名、密码 -->
        <jdbcConnection driverClass="${jdbc.driver}"
                        connectionURL="${jdbc.url}"
                        userId="${jdbc.username}"
                        password="${jdbc.password}">
        </jdbcConnection>
 
        <!-- java类型处理器 -->
        <!--<javaTypeResolver>-->
            <!-- This property is used to specify whether MyBatis Generator should
            force the use of java.math.BigDecimal for DECIMAL and NUMERIC fields, -->
            <!--<property name="forceBigDecimals" value="false" />-->
        <!--</javaTypeResolver>-->
 
        <!--  java模型创建器
                targetPackage:生成的类要放的包
                targetProject:目标项目,指定一个存在的目录下,生成的内容会放到指定目录中
        -->
        <!-- 生成模型的包名和位置 文件夹自己定义 -->
        <javaModelGenerator targetPackage="com.ray.entity"
                            targetProject="src/main/java">
            <!-- 在targetPackage的基础上,根据数据库的schema再生成一层package,最终生成的类放在这个package下,默认为false -->
            <property name="enableSubPackages" value="true" />
            <!-- 设置是否在getter方法中,对String类型字段调用trim()方法 -->
            <property name="trimStrings" value="true" />
        </javaModelGenerator>
        <!-- 生成映射文件的包名和位置 文件夹自己定义-->
        <sqlMapGenerator targetPackage="mapper"
                         targetProject="src/main/resources">
            <property name="enableSubPackages" value="true" />
        </sqlMapGenerator>
        <!-- 生成DAO的包名和位置 文件夹自己定义-->
        <javaClientGenerator type="XMLMAPPER"
                             targetPackage="com.ray.dao"
                             targetProject="src/main/java">
            <property name="enableSubPackages" value="true" />
        </javaClientGenerator>
        <!-- 要生成哪些表 , %表示生成全部的表-->
        <table tableName="%"
               enableCountByExample="false" enableUpdateByExample="false"
               enableDeleteByExample="false" enableSelectByExample="false"
               selectByExampleQueryId="false"></table>
    </context>
</generatorConfiguration>

七、执行生成代码
1、点击run->Edit configurations,如图:

image.png

2、之后弹出运行配置框,为当前配置配置一个名称,这里其名为"generator",

然后在 “Command line” 选项中输入“mybatis-generator:generate -e”

这里加了“-e ”选项是为了让该插件输出详细信息,这样可以帮助我们定位问题。

image.png

3、配置完成后,点击run-》run generator,不出意外的话,在控制台中会出现BUILD SUCCESS的info信息。

image.png image.png

八、项目结构(后)

image.png

九、常见错误
MyBatis-generator常见错误(整合)

过程步骤可以看上面的博文,里面介绍得很详细。
————————————————
mac ideal 按步骤最后maven双击


1.png 2.png 3.png

终极经验:
1,先在数据中建立表
2, 配置generatorConfig.xml

<classPathEntry location="/Users/mac/Documents/Java方向/太子码云仓库/太子java(10.23)/target/storys/WEB-INF/lib/mysql-connector-java-8.0.11.jar"/>

        <!-- 指定数据库表 -->
        <table tableName="tb_chapter
" enableCountByExample="false" enableUpdateByExample="false"
               enableDeleteByExample="false"
               enableSelectByExample="false" selectByExampleQueryId="false">
            <generatedKey column="id" sqlStatement="Mysql" identity="true"/>
        </table>

3,在右侧的maven工程面板中,双击generator插件

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