mybatis自动生成步骤

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1. 引入maven包

<plugin>
    <groupId>org.mybatis.generator</groupId>
    <artifactId>mybatis-generator-maven-plugin</artifactId>
    <version>1.3.2</version>
    <configuration>
        <verbose>true</verbose>
        <overwrite>true</overwrite>
    </configuration>
</plugin>

2. 创建配置文件

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE generatorConfiguration
        PUBLIC "-//mybatis.org//DTD MyBatis Generator Configuration 1.0//EN"
        "./mybatis-generator-config_1_0.dtd"><!-- 因为报红，所以这里注意我是下载下来引用的文件。-->
<generatorConfiguration>
    <!-- 数据库驱动:选择你的本地硬盘上面的数据库驱动包-->
    <classPathEntry  location="D:\ideaWorkSpace\eclolgy\lib\lib1\mysql-connector-java-8.0.11.jar"/>
    <context id="DB2Tables"  targetRuntime="MyBatis3">
        <commentGenerator>
            <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="com.mysql.jdbc.Driver" connectionURL="jdbc:mysql://localhost:3306/che_organization?useUnicode=true" userId="用户名" password="密码">
        </jdbcConnection>
        <javaTypeResolver>
            <property name="forceBigDecimals" value="false"/>
        </javaTypeResolver>
        <!-- 生成模型的包名和位置-->
        <javaModelGenerator targetPackage="main.java.com.tc.beisen.entity.model" targetProject="src">
            <property name="enableSubPackages" value="true"/>
            <property name="trimStrings" value="true"/>
        </javaModelGenerator>
        <!-- 生成映射文件的包名和位置-->
        <sqlMapGenerator targetPackage="main.resources.mapper" targetProject="src">
            <property name="enableSubPackages" value="true"/>
        </sqlMapGenerator>
        <!-- 生成DAO的包名和位置-->
        <javaClientGenerator type="XMLMAPPER" targetPackage="main.java.com.tc.beisen.entity.model" targetProject="src">
            <property name="enableSubPackages" value="true"/>
        </javaClientGenerator>
        <!-- 要生成的表 tableName是数据库中的表名或视图名 domainObjectName是实体类名-->
        <table tableName="t_auto_show" domainObjectName="User" enableCountByExample="true"
               enableUpdateByExample="true" enableDeleteByExample="true" enableSelectByExample="true" selectByExampleQueryId="true"></table>
    </context>
</generatorConfiguration>

这里头部信息mybatis-generator-config_1_0.dtd文件可能会报错。
我是请求的http地址下载下来了。
具体的文件不知道为啥上传不上去我把内容贴在最后面了。
只需要建一个mybatis-generator-config_1_0.dtd文件。复制粘贴进去就可以了。

3. 点击如图，配置maven

然后双击，如果不报错的话就生成相对应的文件了。

4. 只需要建一个mybatis-generator-config_1_0.dtd文件。复制粘贴进去就可以了。

<?xml version="1.0" encoding="UTF-8"?>
<!--

       Copyright 2006-2017 the original author or authors.

       Licensed under the Apache License, Version 2.0 (the "License");
       you may not use this file except in compliance with the License.
       You may obtain a copy of the License at

          http://www.apache.org/licenses/LICENSE-2.0

       Unless required by applicable law or agreed to in writing, software
       distributed under the License is distributed on an "AS IS" BASIS,
       WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
       See the License for the specific language governing permissions and
       limitations under the License.

-->
<!--
  This DTD defines the structure of the MyBatis generator configuration file.
  Configuration files should declare the DOCTYPE as follows:
  
  <!DOCTYPE generatorConfiguration PUBLIC
    "-//mybatis.org//DTD MyBatis Generator Configuration 1.0//EN"
    "http://mybatis.org/dtd/mybatis-generator-config_1_0.dtd">
  
  Please see the documentation included with MyBatis generator for details on each option
  in the DTD.  You may also view documentation on-line here:
  
  http://www.mybatis.org/generator/
  
-->

<!--
  The generatorConfiguration element is the root element for configurations.
-->
<!ELEMENT generatorConfiguration (properties?, classPathEntry*, context+)>
                        
<!--
  The properties element is used to define a standard Java properties file
  that contains placeholders for use in the remainder of the configuration
  file.
-->
<!ELEMENT properties EMPTY>
<!ATTLIST properties
  resource CDATA #IMPLIED
  url CDATA #IMPLIED>
  
<!--
  The context element is used to describe a context for generating files, and the source
  tables.
-->
<!ELEMENT context (property*, plugin*, commentGenerator?, (connectionFactory | jdbcConnection), javaTypeResolver?,
                         javaModelGenerator, sqlMapGenerator?, javaClientGenerator?, table+)>
<!ATTLIST context id ID #REQUIRED
  defaultModelType CDATA #IMPLIED
  targetRuntime CDATA #IMPLIED
  introspectedColumnImpl CDATA #IMPLIED>

<!--
  The connectionFactory element is used to describe the connection factory used
  for connecting to the database for introspection.  Either connectionFacoty
  or jdbcConnection must be specified, but not both.
-->
<!ELEMENT connectionFactory (property*)>
<!ATTLIST connectionFactory
  type CDATA #IMPLIED>

<!--
  The jdbcConnection element is used to describe the JDBC connection that the generator
  will use to introspect the database.
-->
<!ELEMENT jdbcConnection (property*)>
<!ATTLIST jdbcConnection 
  driverClass CDATA #REQUIRED
  connectionURL CDATA #REQUIRED
  userId CDATA #IMPLIED
  password CDATA #IMPLIED>

<!--
  The classPathEntry element is used to add the JDBC driver to the run-time classpath.
  Repeat this element as often as needed to add elements to the classpath.
-->
<!ELEMENT classPathEntry EMPTY>
<!ATTLIST classPathEntry
  location CDATA #REQUIRED>

<!--
  The property element is used to add custom properties to many of the generator's
  configuration elements.  See each element for example properties.
  Repeat this element as often as needed to add as many properties as necessary
  to the configuration element.
-->
<!ELEMENT property EMPTY>
<!ATTLIST property
  name CDATA #REQUIRED
  value CDATA #REQUIRED>

<!--
  The plugin element is used to define a plugin.
-->
<!ELEMENT plugin (property*)>
<!ATTLIST plugin
  type CDATA #REQUIRED>

<!--
  The javaModelGenerator element is used to define properties of the Java Model Generator.
  The Java Model Generator builds primary key classes, record classes, and Query by Example 
  indicator classes.
-->
<!ELEMENT javaModelGenerator (property*)>
<!ATTLIST javaModelGenerator
  targetPackage CDATA #REQUIRED
  targetProject CDATA #REQUIRED>

<!--
  The javaTypeResolver element is used to define properties of the Java Type Resolver.
  The Java Type Resolver is used to calculate Java types from database column information.
  The default Java Type Resolver attempts to make JDBC DECIMAL and NUMERIC types easier
  to use by substituting Integral types if possible (Long, Integer, Short, etc.)
-->
<!ELEMENT javaTypeResolver (property*)>
<!ATTLIST javaTypeResolver
  type CDATA #IMPLIED>

<!--
  The sqlMapGenerator element is used to define properties of the SQL Map Generator.
  The SQL Map Generator builds an XML file for each table that conforms to iBATIS'
  SqlMap DTD.
-->
<!ELEMENT sqlMapGenerator (property*)>
<!ATTLIST sqlMapGenerator
  targetPackage CDATA #REQUIRED
  targetProject CDATA #REQUIRED>

<!--
  The javaClientGenerator element is used to define properties of the Java client Generator.
  The Java Client Generator builds Java interface and implementation classes
  (as required) for each table.
  If this element is missing, then the generator will not build Java Client classes.
-->
<!ELEMENT javaClientGenerator (property*)>
<!ATTLIST javaClientGenerator
  type CDATA #REQUIRED
  targetPackage CDATA #REQUIRED
  targetProject CDATA #REQUIRED
  implementationPackage CDATA #IMPLIED>

<!--
  The table element is used to specify a database table that will be the source information
  for a set of generated objects.
-->
<!ELEMENT table (property*, generatedKey?, domainObjectRenamingRule?, columnRenamingRule?, (columnOverride | ignoreColumn | ignoreColumnsByRegex)*) >
<!ATTLIST table
  catalog CDATA #IMPLIED
  schema CDATA #IMPLIED
  tableName CDATA #REQUIRED
  alias CDATA #IMPLIED
  domainObjectName CDATA #IMPLIED
  mapperName CDATA #IMPLIED
  sqlProviderName CDATA #IMPLIED
  enableInsert CDATA #IMPLIED
  enableSelectByPrimaryKey CDATA #IMPLIED
  enableSelectByExample CDATA #IMPLIED
  enableUpdateByPrimaryKey CDATA #IMPLIED
  enableDeleteByPrimaryKey CDATA #IMPLIED
  enableDeleteByExample CDATA #IMPLIED
  enableCountByExample CDATA #IMPLIED
  enableUpdateByExample CDATA #IMPLIED
  selectByPrimaryKeyQueryId CDATA #IMPLIED
  selectByExampleQueryId CDATA #IMPLIED
  modelType CDATA #IMPLIED
  escapeWildcards CDATA #IMPLIED
  delimitIdentifiers CDATA #IMPLIED
  delimitAllColumns CDATA #IMPLIED>

<!--
  The columnOverride element is used to change certain attributes of the column
  from their default values.
-->
<!ELEMENT columnOverride (property*)>
<!ATTLIST columnOverride
  column CDATA #REQUIRED
  property CDATA #IMPLIED
  javaType CDATA #IMPLIED
  jdbcType CDATA #IMPLIED
  typeHandler CDATA #IMPLIED
  isGeneratedAlways CDATA #IMPLIED
  delimitedColumnName CDATA #IMPLIED>

<!--
  The ignoreColumn element is used to identify a column that should be ignored.
  No generated SQL will refer to the column, and no property will be generated
  for the column in the model objects.
-->
<!ELEMENT ignoreColumn EMPTY>
<!ATTLIST ignoreColumn
  column CDATA #REQUIRED
  delimitedColumnName CDATA #IMPLIED>

<!--
  The ignoreColumnsByRegex element is used to identify a column pattern that should be ignored.
  No generated SQL will refer to the column, and no property will be generated
  for the column in the model objects.
-->
<!ELEMENT ignoreColumnsByRegex (except*)>
<!ATTLIST ignoreColumnsByRegex
  pattern CDATA #REQUIRED>

<!--
  The except element is used to identify an exception to the ignoreColumnsByRegex rule.
  If a column matches the regex rule, but also matches the exception, then the
  column will be included in the generated objects.
-->
<!ELEMENT except EMPTY>
<!ATTLIST except
  column CDATA #REQUIRED
  delimitedColumnName CDATA #IMPLIED>

<!--
  The generatedKey element is used to identify a column in the table whose value
  is calculated - either from a sequence (or some other query), or as an identity column.
-->
<!ELEMENT generatedKey EMPTY>
<!ATTLIST generatedKey
  column CDATA #REQUIRED
  sqlStatement CDATA #REQUIRED
  identity CDATA #IMPLIED
  type CDATA #IMPLIED>

<!--
  The domainObjectRenamingRule element is used to specify a rule for renaming
  object domain name before the corresponding domain object name is calculated
-->
<!ELEMENT domainObjectRenamingRule EMPTY>
<!ATTLIST domainObjectRenamingRule
  searchString CDATA #REQUIRED
  replaceString CDATA #IMPLIED>

<!--
  The columnRenamingRule element is used to specify a rule for renaming
  columns before the corresponding property name is calculated
-->
<!ELEMENT columnRenamingRule EMPTY>
<!ATTLIST columnRenamingRule
  searchString CDATA #REQUIRED
  replaceString CDATA #IMPLIED>

<!--
  The commentGenerator element is used to define properties of the Comment Generator.
  The Comment Generator adds comments to generated elements.
-->
<!ELEMENT commentGenerator (property*)>
<!ATTLIST commentGenerator
  type CDATA #IMPLIED>