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This article focuses on "how to use mybatis-plus reverse automatic generation of classes in SpringBoot projects", interested friends may wish to have a look. The method introduced in this paper is simple, fast and practical. Next let the editor to take you to learn "how to use mybatis-plus reverse automatic generation classes in SpringBoot projects"!

Catalogue

1. Create a new sub-module project under your SpringBoot project

two。 Create a new package and a java class name under this module: CodeGenerator

3. Create a new folder under resources to store mapper files

4. Configure the CodeGenerator class

5. Start the code generation class main method

6. Delete a file

1. Create a new sub-module project under your SpringBoot project

Pom.xml adds the following dependencies:

1.8 mysql mysql-connector-java com.baomidou mybatis-plus-generator 3.3.2 com.baomidou mybatis-plus-extension 3.3.2 org.projectlombok Lombok true org.springframework.boot spring-boot-starter-freemarker 2.3.1.RELEASE org.springframework.boot spring-boot-maven-plugin

Ps: the name is random. You'd better bring generator to tell that this is an automatic code generation module.

two。 Create a new package and a java class name under this module: CodeGenerator

The complete code is as follows:

Import com.baomidou.mybatisplus.core.exceptions.MybatisPlusException;import com.baomidou.mybatisplus.core.toolkit.StringPool;import com.baomidou.mybatisplus.core.toolkit.StringUtils;import com.baomidou.mybatisplus.generator.AutoGenerator;import com.baomidou.mybatisplus.generator.InjectionConfig;import com.baomidou.mybatisplus.generator.config.*;import com.baomidou.mybatisplus.generator.config.po.TableInfo;import com.baomidou.mybatisplus.generator.config.rules.DateType;import com.baomidou.mybatisplus.generator.config.rules.NamingStrategy;import com.baomidou.mybatisplus.generator.engine.FreemarkerTemplateEngine Import java.util.ArrayList;import java.util.List;import java.util.Scanner;/** * @ Description: code generation class * / public class CodeGenerator {/ / database connection parameter public static String driver = "com.mysql.cj.jdbc.Driver"; public static String url = "jdbc:mysql://localhost:3306/rht_test?characterEncoding=utf8&useSSL=false&serverTimezone=Asia/Shanghai&rewriteBatchedStatements=true"; public static String username= "root"; public static String password= "123456" / / parent-level package name public static String parentPackage = "cn.rht"; / / the target path for code generation public static String generateTo = "/ rht-generator/src/main/java"; / / the generation path of mapper.xml public static String mapperXmlPath = "/ rht-generator/src/main/resources/mapper"; / / the common base class of the controller, which is used to abstract the controller's public method. A null value indicates that there is no parent class public static String baseControllerClassName. / / the common base class of the business layer, used to abstract the public method public static String baseServiceClassName; / / author name public static String author = "rht.cn"; / / module name, which is used to make up the template file of the package name public static String modelName = "portal"; / / Mapper interface, without writing the suffix .ftl public static String mapperTempalte = "/ ftl/mapper.java"; / *

* read console contents *

* / public static String scanner (String tip) {Scanner scanner = new Scanner (System.in); StringBuilder help = new StringBuilder (); help.append ("Please enter" + tip + ":"); System.out.println (help.toString ()); if (scanner.hasNext ()) {String ipt = scanner.next () If (StringUtils.isNotEmpty (ipt)) {return ipt;}} throw new MybatisPlusException ("Please enter correct" + tip + "!") ;} / * RUN THIS * / public static void main (String [] args) {/ / Code generator AutoGenerator mpg = new AutoGenerator (); / / Global configuration GlobalConfig gc = new GlobalConfig (); String projectPath = System.getProperty ("user.dir"); gc.setOutputDir (projectPath + generateTo); gc.setAuthor (author) Gc.setOpen (false); / / set time type to Date gc.setDateType (DateType.TIME_PACK); / / enable swagger / / gc.setSwagger2 (true); / / set resultMap gc.setBaseResultMap (true) of mapper.xml; mpg.setGlobalConfig (gc); / / data source configuration DataSourceConfig dsc = new DataSourceConfig (); dsc.setUrl (url) / / dsc.setSchemaName ("public"); dsc.setDriverName (driver); dsc.setUsername (username); dsc.setPassword (password); mpg.setDataSource (dsc); / / package configuration PackageConfig pc = new PackageConfig (); pc.setEntity ("model"); / / pc.setModuleName (scanner ("module name")); pc.setModuleName (modelName) Pc.setParent (parentPackage); mpg.setPackageInfo (pc); / / Custom configuration InjectionConfig cfg = new InjectionConfig () {@ Override public void initMap () {/ / to do nothing}}; List focList = new ArrayList () FocList.add (new FileOutConfig ("/ templates/mapper.xml.ftl") {@ Override public String outputFile (TableInfo tableInfo) {/ / Custom input file name return projectPath + mapperXmlPath + "/" + tableInfo.getEntityName () + "Mapper" + StringPool.DOT_XML;}}) Cfg.setFileOutConfigList (focList); mpg.setCfg (cfg); mpg.setTemplate (new TemplateConfig (). SetXml (null)); mpg.setTemplate (new TemplateConfig (). SetMapper (mapperTempalte)); / / Policy configuration StrategyConfig strategy = new StrategyConfig (); strategy.setNaming (NamingStrategy.underline_to_camel); / / Field Hump naming strategy.setColumnNaming (NamingStrategy.underline_to_camel) / / set the lombok strategy.setEntityLombokModel (true) of the entity class; / / set the parent class if (baseController ClassNameplate null) strategy.setSuperControllerClass (baseControllerClassName) of the controller; / / set the parent class if (baseServiceClassName! = null) strategy.setSuperServiceImplClass (baseServiceClassName) of the service class; / / strategy. / / set the annotation strategy.setEntityTableFieldAnnotationEnable (true) of the attribute of the entity class corresponding to the table field; / / set the table name String tableName = scanner ("table name, all all tables"); if (! "all" .equals IgnoreCase (tableName) {strategy.setInclude (tableName);} strategy.setTablePrefix (pc.getModuleName () + "_"); strategy.setRestControllerStyle (true); mpg.setStrategy (strategy); / / Select the freemarker engine to be specified as follows, note that pom dependencies must have! Mpg.setTemplateEngine (new FreemarkerTemplateEngine ()); mpg.execute ();}} 3. Create a new folder under resources to store mapper files

Create a new template file: mapper.java.ftl

The complete code of the template is as follows:

Package ${package.Mapper}; import ${package.Entity}. ${entity}; import ${superMapperClassPackage}; import org.springframework.stereotype.Repository;/** *

* ${table.comment!} Mapper interface *

* * @ author ${author} * @ since ${date} * / interface ${table.mapperName}: ${superMapperClass} @ Repositorypublic interface ${table.mapperName} extends ${superMapperClass} {} 4 Configure the CodeGenerator class

Ps: please configure it according to your actual path

5. Start the code generation class main method

Ps: entering all will automatically generate all configuration files under the configuration database, or directly enter a single table name to generate the Controller,mapper,service,model layer and mapper.xml file of a table

The following is a display of some of the automatically generated file information in my input table: user

User entity class

UserMapper.xml file

If you have a lot of tables to generate, but don't want to generate all of them, you can use 134 lines of code in the CodeGenerator class code

/ / set table name String tableName = scanner ("table name, all all tables"); if (! "all" .equals IgnoreCase (tableName)) {strategy.setInclude (tableName);}

To be replaced by:

String [] tableNames = {"user", "dept"}; / / Collection of database table names for (int I = 0; I

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