How to automatically generate duplicate code using code generation tools in Java?

How to automatically generate duplicate code using code generation tools in Java?

Introduction: During the development process, we often encounter situations where we need to write a large amount of repeated code. These duplicate codes not only affect development efficiency, but also easily cause errors. In order to solve this problem, we can use code generation tools in Java to automatically generate duplicate codes and improve development efficiency and code quality.

1. Selection of code generation tools
There are many code generation tools to choose from in Java, such as MyBatis Generator, Lombok, Eclipse's Code Templates, etc. Each tool has its own characteristics and advantages, and we can choose the right tool according to our needs.

2. Code generation configuration
Before using the code generation tool, we need to configure it accordingly. The following uses MyBatis Generator as an example to illustrate.

1. Introduce the dependencies of MyBatis Generator:

   <dependency>
    <groupId>org.mybatis.generator</groupId>
    <artifactId>mybatis-generator-core</artifactId>
    <version>1.3.7</version>
   </dependency>

2. Create the MyBatis Generator configuration file (generatorConfig.xml) and configure the relevant information of the generated code, Such as database connection, generated model and mapping files, etc.

   <?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="default" targetRuntime="MyBatis3">
        <property name="javaFileEncoding" value="UTF-8"/>
        <commentGenerator>
            <property name="suppressDate" value="true"/>
            <property name="suppressAllComments" value="true"/>
        </commentGenerator>
        <jdbcConnection driverClass="com.mysql.jdbc.Driver" connectionURL="jdbc:mysql://localhost:3306/mydb" userId="root" password="123456"/>
        <javaModelGenerator targetPackage="com.example.model" targetProject="src/main/java"/>
        <sqlMapGenerator targetPackage="com.example.mapper" targetProject="src/main/resources"/>
        <javaClientGenerator targetPackage="com.example.mapper" targetProject="src/main/java"/>
        <table tableName="user"/>
    </context>
   </generatorConfiguration>

3. Use the code generation tool to automatically generate duplicate codes
After the configuration is completed, we can run the code generation tool to automatically generate code.

1. Use the following command in the command line to generate code:

   java -jar mybatis-generator-core-x.x.x.jar -configfile generatorConfig.xml

2. After running this command, the code generation tool will generate Corresponding model classes, mapping files and Mapper interfaces.

3. Generated code example:

   // User.java
   package com.example.model;
   
   public class User {
    private Integer id;
    private String username;
    private String password;
   
    // getters and setters...
   
    // toString...
   }
   
   // UserMapper.java
   package com.example.mapper;
   
   import com.example.model.User;
   
   public interface UserMapper {
    int deleteByPrimaryKey(Integer id);
    int insert(User record);
    int insertSelective(User record);
    User selectByPrimaryKey(Integer id);
    int updateByPrimaryKeySelective(User record);
    int updateByPrimaryKey(User record);
   }

Conclusion: By using code generation tools in Java, we can easily automatically generate duplicate code and improve development efficiency and code quality. Not only that, code generation tools can also reduce handwriting errors and avoid problems caused by human factors. Therefore, during the development process, we should make full use of code generation tools to improve development efficiency and reduce workload.

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