mybatis注解开发(mybatis代码自动生成器)

1,使用maven将mybatis-generator-core-1.3.7.jar依赖下载之后，修改源码;

2,用压缩软件打开，如下图:

 3,将DefaultCommentGenerator.class替换，如下图:

//
// Source code recreated from a .class file by IntelliJ IDEA
// (powered by Fernflower decompiler)
//

package org.mybatis.generator.internal;

import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.Properties;
import java.util.Set;
import org.mybatis.generator.api.CommentGenerator;
import org.mybatis.generator.api.IntrospectedColumn;
import org.mybatis.generator.api.IntrospectedTable;
import org.mybatis.generator.api.dom.java.CompilationUnit;
import org.mybatis.generator.api.dom.java.Field;
import org.mybatis.generator.api.dom.java.FullyQualifiedJavaType;
import org.mybatis.generator.api.dom.java.InnerClass;
import org.mybatis.generator.api.dom.java.InnerEnum;
import org.mybatis.generator.api.dom.java.JavaElement;
import org.mybatis.generator.api.dom.java.Method;
import org.mybatis.generator.api.dom.java.Parameter;
import org.mybatis.generator.api.dom.java.TopLevelClass;
import org.mybatis.generator.api.dom.xml.XmlElement;
import org.mybatis.generator.internal.util.StringUtility;

public class DefaultCommentGenerator implements CommentGenerator {
    private Properties properties = new Properties();
    private Properties systemPro = System.getProperties();
    private boolean suppressDate = false;
    private boolean suppressAllComments = false;
    private String currentDateStr = (new SimpleDateFormat("yyyy-MM-dd")).format(new Date());

    public DefaultCommentGenerator() {
    }

    public void addJavaFileComment(CompilationUnit compilationUnit) {
    }

    public void addComment(XmlElement xmlElement) {
    }

    public void addRootComment(XmlElement rootElement) {
    }

    public void addGeneralMethodAnnotation(Method method, IntrospectedTable introspectedTable, Set set) {
    }

    public void addGeneralMethodAnnotation(Method method, IntrospectedTable introspectedTable, IntrospectedColumn introspectedColumn, Set set) {
    }

    public void addFieldAnnotation(Field field, IntrospectedTable introspectedTable, Set set) {
    }

    public void addFieldAnnotation(Field field, IntrospectedTable introspectedTable, IntrospectedColumn introspectedColumn, Set set) {
    }

    public void addClassAnnotation(InnerClass innerClass, IntrospectedTable introspectedTable, Set set) {
    }

    public void addConfigurationProperties(Properties properties) {
        this.properties.putAll(properties);
        this.suppressDate = StringUtility.isTrue(properties.getProperty("suppressDate"));
        this.suppressAllComments = StringUtility.isTrue(properties.getProperty("suppressAllComments"));
    }

    protected void addJavadocTag(JavaElement javaElement, boolean markAsDoNotDelete) {
        javaElement.addJavaDocLine(" *");
        StringBuilder sb = new StringBuilder();
        sb.append(" * ");
        sb.append("@mbg.generated");
        if (markAsDoNotDelete) {
            sb.append(" do_not_delete_during_merge");
        }

        String s = this.getDateString();
        if (s != null) {
            sb.append(' ');
            sb.append(s);
        }

        javaElement.addJavaDocLine(sb.toString());
    }

    protected String getDateString() {
        String result = null;
        if (!this.suppressDate) {
            result = this.currentDateStr;
        }

        return result;
    }

    public void addClassComment(InnerClass innerClass, IntrospectedTable introspectedTable) {
        if (!this.suppressAllComments) {
            StringBuilder sb = new StringBuilder();
            innerClass.addJavaDocLine("");
        }
    }

    public void addEnumComment(InnerEnum innerEnum, IntrospectedTable introspectedTable) {
        if (!this.suppressAllComments) {
            StringBuilder sb = new StringBuilder();
            innerEnum.addJavaDocLine("");
        }
    }

    public void addFieldComment(Field field, IntrospectedTable introspectedTable, IntrospectedColumn introspectedColumn) {
        if (!this.suppressAllComments) {
            StringBuilder sb = new StringBuilder();
            field.addJavaDocLine("");
        }
    }

    public void addFieldComment(Field field, IntrospectedTable introspectedTable) {
        if (!this.suppressAllComments) {
            StringBuilder sb = new StringBuilder();
            field.addJavaDocLine("");
        }
    }

    public void addModelClassComment(TopLevelClass topLevelClass, IntrospectedTable introspectedTable) {
    }

    public void addGeneralMethodComment(Method method, IntrospectedTable introspectedTable) {
        if (!this.suppressAllComments) {
            ;
        }
    }

    public void addGetterComment(Method method, IntrospectedTable introspectedTable, IntrospectedColumn introspectedColumn) {
        if (!this.suppressAllComments) {
            method.addJavaDocLine("");
        }
    }

    public void addSetterComment(Method method, IntrospectedTable introspectedTable, IntrospectedColumn introspectedColumn) {
        if (!this.suppressAllComments) {
            method.addJavaDocLine("");
        }
    }

    public void addClassComment(InnerClass innerClass, IntrospectedTable introspectedTable, boolean markAsDoNotDelete) {
        if (!this.suppressAllComments) {
            StringBuilder sb = new StringBuilder();
            innerClass.addJavaDocLine("");
        }
    }
}

4,在项目中使用该修改过的jar包

注意，我的项目使用的是8.0.15版本的mysql-connector-java,如果数据库不是8.0版本的，就会出现可能将同名不同表的实体也生成出来，出现这种情况的时候在自动生成代码配置文件中加入:

主要是在链接后面加上?nullCatalogMeansCurrent=true