Java IDEA根据database以及脚本代码自动生成DO,DAO,SqlMapper文件（一）

根据数据库代码自动生成的插件挺多的，这里主要分享两种：

1.根据database以及脚本代码自动生成

2.根据mybatis-generator-core自动生成（下一章节进行分享，包含sqlserver的注释获取）

这篇主要介绍的是database以及groovy脚本代码自动生成，可以自定义去除数据库表的前缀生成相应的类名，支持获取表的备注，字段备注，主键获取。

database以及脚本代码自动生成相对于mybatis-generator-core自动生成，其优点是不需要将生成的文件的代码嵌入到项目中，而是相当于IDEA的脚本插件使用，但是不好同时生成DO,DAO,SqlMapper文件,因为同时生成的话，反而使用mybatis-generator-core更加方便。

注：使用database以及脚本代码自动生成的时候得先生成DO文件，再DAO文件，最后生成SqlMapper文件，具体原因将在流程里面做介绍

废话不多，直接进入操作过程：

1.配置Database，链接数据库

这一步网上教程很多，也相对简单，这里不做详细介绍了，先选择数据源，这里使用MySql做介绍

接下来就是配置链接信息，需要填写的如下图，点击测试通过之后直接APPLY,OK即可

2.接下来创建脚本文件

跳转到脚本目录下新建三个文件，分别为生成DO,DAO,SQLMAPPER文件，代码如下：

Generate ModePOJOs.groovy

import com.intellij.database.model.DasTable
import com.intellij.database.model.ObjectKind
import com.intellij.database.util.Case
import com.intellij.database.util.DasUtil
import java.io.*
import java.text.SimpleDateFormat

/**
 * @Description 生成DO文件
 * @zsy
 * @Date 2020-07-13
 */
packageName = ""
tableComment = ""
typeMapping = [
        (~/(?i)tinyint|smallint|mediumint|int/)      : "Integer",
        (~/(?i)bigint/)                             : "Long",
        (~/(?i)bool|bit/)                        : "Boolean",
        (~/(?i)float|double|decimal|real/)       : "Double",
        (~/(?i)datetime|timestamp|date|time/)    : "Date",
        (~/(?i)blob|binary|bfile|clob|raw|image/): "InputStream",
        (~/(?i)/)                                : "String"
]

//自定义需要去除的表头,根据自己的数据库表头自定义。自定义作者名称
// 只有后面紧接着的是"_"下滑线的表头会被处理，比如：t_estcolumn会被处理，testcolumn不会被处理
tableHeaderRemoved = ["t","t_sys"]
authorName = "zsy"

FILES.chooseDirectoryAndSave("Choose directory", "Choose where to store generated files") { dir ->
    SELECTION.filter { it instanceof DasTable && it.getKind() == ObjectKind.TABLE }.each { generate(it, dir) }
}

def generate(table, dir) {
    def className = javaClassName(table.getName(), true)
    def fields = calcFields(table)
    packageName = getPackageName(dir)
    tableComment = table.getComment()
    if(tableComment==null){
        tableComment = ""
    }
    tableComment = tableComment.replaceAll("
"," ")
    className = className +"DO"
    PrintWriter printWriter = new PrintWriter(new OutputStreamWriter(new FileOutputStream(new File(dir, className + ".java")), "UTF-8"))
    printWriter.withPrintWriter {out -> generate(out, className, fields,table)}
}

// 获取包所在文件夹路径
def getPackageName(dir) {
    return dir.toString().replaceAll("\\", ".").replaceAll("/", ".").replaceAll("^.*src(\.main\.java\.)?", "") + ";"
}

def generate(out, className, fields,table) {
    out.println "package $packageName"
    out.println ""
    out.println "import java.io.Serializable;"
    out.println "import io.swagger.annotations.*;"
    out.println "import lombok.*;"
    Set types = new HashSet()

    fields.each() {
        types.add(it.type)
    }

    if (types.contains("Date")) {
        out.println "import java.util.Date;"
    }

    if (types.contains("InputStream")) {
        out.println "import java.io.InputStream;"
    }
    out.println ""
    out.println "/**
" +
            " * @Description ${tableComment} 
" +
            " * @Author ${authorName} 
" +
            " * @Date "+ new SimpleDateFormat("yyyy-MM-dd").format(new Date()) + " 
" +
            " */"
    out.println ""
    out.println "@Data"
    out.println "@ApiModel(description= "${tableComment}")"
    out.println "public class $className implements Serializable {"
    out.println ""
    out.println genSerialID()
    i = 0
    fields.each() {
        out.println ""
        if(it.commoent==null){
            it.commoent = ""
        }
        it.commoent = it.commoent.replaceAll("
","").replaceAll("
","")
        // 输出注释
        if (isNotEmpty(it.commoent)) {
            out.println "	/**"
            out.println "	 * ${it.commoent.toString()}"
            out.println "	 */"
        }
        out.println "	@ApiModelProperty(value = "${it.commoent}", position = ${i})"
        // 输出成员变量
        out.println "	private ${it.type} ${it.name};"
        i++
    }
    out.println ""
    out.println "}"
}

def calcFields(table) {
    // 加载当前数据库主键
    def primaryKey = ""
    def prKey = DasUtil.getPrimaryKey(table);
    if (prKey != null) {
        def keyRef = prKey.getColumnsRef();
        if (keyRef != null) {
            def it = keyRef.iterate();
            while (it.hasNext()) {
                // 默认只处理单主键
                primaryKey = it.next();
            }
            primaryKey = javaName(primaryKey, false);
        }
    }

    DasUtil.getColumns(table).reduce([]) { fields, col ->
        def spec = Case.LOWER.apply(col.getDataType().getSpecification())
        def typeStr = typeMapping.find { p, t -> p.matcher(spec).find() }.value
        def colName = col.getName()
        def nameTemp = javaName(colName, false)
        // 当前列是否为主键
        def isPrimaryKey = nameTemp.equals(primaryKey)
        def comm =[
                colName : colName,
                name :  nameTemp,
                type : typeStr,
                commoent: col.getComment(),
                isKey: isPrimaryKey,
                annos: "@Column(name = ""+col.getName()+"" )"]
        fields += [comm]
    }
}

// 去掉自定义的字符串，下面的javaName为原始的方法，不去除表头
def javaClassName(str, capitalize) {
    def tempStr = str
    // 去除开头的指定字符串
    tableHeaderRemoved.each(){
        it = it.toLowerCase()
        if (isNotEmpty(it)){
            if (it.size() < tempStr.size()){
                def headTemp = tempStr[0..it.size() - 1]
                def underLineFlag = tempStr[it.size()..it.size()]
                if (it == headTemp.toLowerCase() && underLineFlag == "_") {
                    tempStr = tempStr[it.size()..tempStr.size() - 1]
                    return true
                }
            }
        }
    }
    def s = com.intellij.psi.codeStyle.NameUtil.splitNameIntoWords(tempStr)
            .collect { Case.LOWER.apply(it).capitalize() }
            .join("")
            .replaceAll(/[^p{javaJavaIdentifierPart}[_]]/, "_")
    capitalize || s.length() == 1? s : Case.LOWER.apply(s[0]) + s[1..-1]
}

def javaName(str, capitalize) {
    def s = com.intellij.psi.codeStyle.NameUtil.splitNameIntoWords(str)
            .collect { Case.LOWER.apply(it).capitalize() }
            .join("")
            .replaceAll(/[^p{javaJavaIdentifierPart}[_]]/, "_")
    capitalize || s.length() == 1? s : Case.LOWER.apply(s[0]) + s[1..-1]
}

def isNotEmpty(content) {
    return content != null && content.toString().trim().length() > 0
}

static String changeStyle(String str, boolean toCamel){
    if(!str || str.size() <= 1)
        return str

    if(toCamel){
        String r = str.toLowerCase().split('_').collect{cc -> Case.LOWER.apply(cc).capitalize()}.join('')
        return r[0].toLowerCase() + r[1..-1]
    }else{
        str = str[0].toLowerCase() + str[1..-1]
        return str.collect{cc -> ((char)cc).isUpperCase() ? '_' + cc.toLowerCase() : cc}.join('')
    }
}

static String genSerialID()
{
    return "	private static final long serialVersionUID =  "+Math.abs(new Random().nextLong())+"L;"
}

Generate DaoPOJOs.groovy

import com.intellij.database.model.DasTable
import com.intellij.database.model.ObjectKind
import com.intellij.database.util.Case
import com.intellij.database.util.DasUtil
import java.io.*
import java.text.SimpleDateFormat

/**
 * @Description 生成Dao文件，生成此文件请先生成DO文件
 * @Author zsy
 * @Date 2020-07-13
 */
packageName = ""
tableComment = ""
modelNameSpace = ""
typeMapping = [
        (~/(?i)tinyint|smallint|mediumint|int/)      : "Integer",
        (~/(?i)bigint/)                             : "Long",
        (~/(?i)bool|bit/)                        : "Boolean",
        (~/(?i)float|double|decimal|real/)       : "Double",
        (~/(?i)datetime|timestamp|date|time/)    : "Date",
        (~/(?i)blob|binary|bfile|clob|raw|image/): "InputStream",
        (~/(?i)/)                                : "String"
]

//自定义需要去除的表头,根据自己的数据库表头自定义。自定义作者名称
// 只有后面紧接着的是"_"下滑线的表头会被处理，比如：t_estcolumn会被处理，testcolumn不会被处理
tableHeaderRemoved = ["t","t_sys"]
authorName = "ZhengSiyuan"
//项目路径不能包含中文
modelCreateDir = "mybatis-generator-test\code-generato\src\main\java\com\zsy\codegenerato\models"

FILES.chooseDirectoryAndSave("Choose directory", "Choose where to store generated files") { dir ->
    SELECTION.filter { it instanceof DasTable && it.getKind() == ObjectKind.TABLE }.each { generate(it, dir) }
}

def generate(table, dir) {
    def className = javaClassName(table.getName(), true)
    def fields = calcFields(table)
    packageName = getPackageName(dir)
    tableComment = table.getComment()
    def modelDirPath = getSqlMapperModelNameSpace(dir)
    getModelNameSpace(modelDirPath, className)
    PrintWriter printWriter = new PrintWriter(new OutputStreamWriter(new FileOutputStream(new File(dir, className + "DAO.java")), "UTF-8"))
    printWriter.withPrintWriter {out -> generateSqlMapper(out, className, fields,table)}
}

// 获取包所在文件夹路径
def getPackageName(dir) {
    return dir.toString().replaceAll("\\", ".").replaceAll("/", ".").replaceAll("^.*src(\.main\.java\.)?", "") + ";"
}

//获取Model的项目保存地址
def getSqlMapperModelNameSpace(dir){
    def nameTemp = modelCreateDir.toString().replaceAll("\\", ".").replaceAll("/", ".")
    def nameList = nameTemp.split('\.')
    def projectName = nameList[0]
    def allDirPath = dir.toString().replaceAll("\\", ".").replaceAll("/", ".")
    def index = allDirPath.toString().indexOf(projectName)
    def commonPath = allDirPath[0..index-1]
    return "${commonPath}${nameTemp}".replaceAll("\.", "\\")
}

def getModelNameSpace(modelDir, className){
    def modelPathTemp = new File(modelDir)
    modelPathTemp.eachFileRecurse{directory->createModelNameSpace(directory, className)}
}

def createModelNameSpace(directory, className){
    def judgeName = className+"DO.java"
    if(directory.toString().indexOf(judgeName.toString())>0){
        modelNameSpace = directory.toString().replaceAll("\\", ".")
                .replaceAll("/", ".")
                .replaceAll("^.*src(\.main\.java\.)?", "")
        modelNameSpace = modelNameSpace[0..modelNameSpace.size()-6]
    }
}

def generateSqlMapper(out, className, fields,table) {
    out.println "package ${packageName}"
    out.println ""
    out.println "import ${modelNameSpace};"
    out.println "import com.huitu.service.enums.DbEnum;"
    out.println "import java.util.List;"
    out.println "import org.springframework.stereotype.Component;"
    out.println ""
    def componentName = firstCharToLow(className)+"DAO"
    out.println "@Component("${componentName}")"
    out.println "public interface ${className}DAO {"
    out.println ""
    out.println "}"
}

def calcFields(table) {
    // 加载当前数据库主键
    def primaryKey = ""
    def prKey = DasUtil.getPrimaryKey(table);
    if (prKey != null) {
        def keyRef = prKey.getColumnsRef();
        if (keyRef != null) {
            def it = keyRef.iterate();
            while (it.hasNext()) {
                // 默认只处理单主键
                primaryKey = it.next();
            }
            primaryKey = javaName(primaryKey, false);
        }
    }

    DasUtil.getColumns(table).reduce([]) { fields, col ->
        def spec = Case.LOWER.apply(col.getDataType().getSpecification())
        def typeStr = typeMapping.find { p, t -> p.matcher(spec).find() }.value
        def colName = col.getName()
        def nameTemp = javaName(colName, false)
        // 当前列是否为主键
        def isPrimaryKey = nameTemp.equals(primaryKey)
        def comm =[
                colName : colName,
                name :  nameTemp,
                type : typeStr,
                commoent: col.getComment(),
                isKey: isPrimaryKey,
                annos: "@Column(name = ""+col.getName()+"" )"]
        fields += [comm]
    }
}

// 去掉自定义的字符串，下面的javaName为原始的方法，不去除表头
def javaClassName(str, capitalize) {
    def tempStr = str
    // 去除开头的指定字符串
    tableHeaderRemoved.each(){
        it = it.toLowerCase()
        if (isNotEmpty(it)){
            if (it.size() < tempStr.size()){
                def headTemp = tempStr[0..it.size() - 1]
                def underLineFlag = tempStr[it.size()..it.size()]
                if (it == headTemp.toLowerCase() && underLineFlag == "_") {
                    tempStr = tempStr[it.size()..tempStr.size() - 1]
                    return true
                }
            }
        }
    }
    def s = com.intellij.psi.codeStyle.NameUtil.splitNameIntoWords(tempStr)
            .collect { Case.LOWER.apply(it).capitalize() }
            .join("")
            .replaceAll(/[^p{javaJavaIdentifierPart}[_]]/, "_")
    capitalize || s.length() == 1? s : Case.LOWER.apply(s[0]) + s[1..-1]
}

def javaName(str, capitalize) {
    def s = com.intellij.psi.codeStyle.NameUtil.splitNameIntoWords(str)
            .collect { Case.LOWER.apply(it).capitalize() }
            .join("")
            .replaceAll(/[^p{javaJavaIdentifierPart}[_]]/, "_")
    capitalize || s.length() == 1? s : Case.LOWER.apply(s[0]) + s[1..-1]
}

def isNotEmpty(content) {
    return content != null && content.toString().trim().length() > 0
}

static String changeStyle(String str, boolean toCamel){
    if(!str || str.size() <= 1)
        return str

    if(toCamel){
        String r = str.toLowerCase().split('_').collect{cc -> Case.LOWER.apply(cc).capitalize()}.join('')
        return r[0].toLowerCase() + r[1..-1]
    }else{
        str = str[0].toLowerCase() + str[1..-1]
        return str.collect{cc -> ((char)cc).isUpperCase() ? '_' + cc.toLowerCase() : cc}.join('')
    }
}

//首字母转成大写
static String firstCharToUp(String str){
    String r = str[0..0]
    if(((char)r).isLowerCase()){
        return "${r.toUpperCase()}${str[1..str.length()-1]}"
    }
    return str
}

//首字母转为小写
static String firstCharToLow(String str){
    String r = str[0..0]
    if(((char)r).isUpperCase()){
        return "${r.toLowerCase()}${str[1..str.length()-1]}"
    }
    return str
}

static String genSerialID()
{
    return "	private static final long serialVersionUID =  "+Math.abs(new Random().nextLong())+"L;"
}

Generate MapperPOJOs.groovy

import com.intellij.database.model.DasTable
import com.intellij.database.model.ObjectKind
import com.intellij.database.util.Case
import com.intellij.database.util.DasUtil
import java.io.*
import java.text.SimpleDateFormat

/**
 * @Description 生成SqlMapper文件，生成此文件请先生成DO、DAO文件
 * @Author zsy
 * @Date 2020-07-13
 */
packageName = ""
tableComment = ""
modelNameSpace = ""
daoNameSpace = ""
tableName = ""
typeMapping = [
        (~/(?i)tinyint|smallint|mediumint|int/)      : "Integer",
        (~/(?i)bigint/)                             : "Long",
        (~/(?i)bool|bit/)                        : "Boolean",
        (~/(?i)float|double|decimal|real/)       : "Double",
        (~/(?i)datetime|timestamp|date|time/)    : "Date",
        (~/(?i)blob|binary|bfile|clob|raw|image/): "InputStream",
        (~/(?i)/)                                : "String"
]

//自定义需要去除的表头,根据自己的数据库表头自定义。自定义作者名称
// 只有后面紧接着的是"_"下滑线的表头会被处理，比如：t_estcolumn会被处理，testcolumn不会被处理
tableHeaderRemoved = ["t","t_sys"]
authorName = "ZhengSiyuan"
//项目路径不能包含中文
modelCreateDir = "mybatis-generator-test\code-generato\src\main\java\com\zsy\codegenerato\models"
daoCreateDir = "mybatis-generator-test\code-generato\src\main\java\com\zsy\codegenerato\mapper"

FILES.chooseDirectoryAndSave("Choose directory", "Choose where to store generated files") { dir ->
    SELECTION.filter { it instanceof DasTable && it.getKind() == ObjectKind.TABLE }.each { generate(it, dir) }
}

def generate(table, dir) {
    tableName = table.getName()
    def className = javaClassName(tableName, true)
    def fields = calcFields(table)
    packageName = getPackageName(dir)
    tableComment = table.getComment()
    def modelDirPath = getModelAndDaoSavePath(dir, modelCreateDir)
    def daoDirPath = getModelAndDaoSavePath(dir, daoCreateDir)
    getNameSpace(modelDirPath, className, "DO.java")
    getNameSpace(daoDirPath, className, "DAO.java")
    PrintWriter printWriter = new PrintWriter(new OutputStreamWriter(new FileOutputStream(new File(dir, className + "Mapper.xml")), "UTF-8"))
    printWriter.withPrintWriter {out -> generateSqlMapper(out, className, fields,table)}
}

// 获取包所在文件夹路径
def getPackageName(dir) {
    return dir.toString().replaceAll("\\", ".").replaceAll("/", ".").replaceAll("^.*src(\.main\.java\.)?", "") + ";"
}

//获取Model的项目保存地址
def getModelAndDaoSavePath(dir, savePath){
    def nameTemp = savePath.toString().replaceAll("\\", ".").replaceAll("/", ".")
    def nameList = nameTemp.split('\.')
    def projectName = nameList[0]
    def allDirPath = dir.toString().replaceAll("\\", ".").replaceAll("/", ".")
    def index = allDirPath.toString().indexOf(projectName)
    def commonPath = allDirPath[0..index-1]
    return "${commonPath}${nameTemp}".replaceAll("\.", "\\")
}

def getNameSpace(modelDir, className, suffix){
    def modelPathTemp = new File(modelDir)
    modelPathTemp.eachFileRecurse{directory->createModelNameSpace(directory, className, suffix)}
}

def createModelNameSpace(directory, className, suffix){
    def judgeName = className+suffix
    if(directory.toString().indexOf(judgeName.toString())>0){
        def tempNameSpace = directory.toString().replaceAll("\\", ".")
                .replaceAll("/", ".")
                .replaceAll("^.*src(\.main\.java\.)?", "")
        if(suffix=="DO.java"){
            modelNameSpace = tempNameSpace[0..tempNameSpace.size()-6]
        }else if(suffix=="DAO.java"){
            daoNameSpace = tempNameSpace[0..tempNameSpace.size()-6]
        }
    }
}

def generateSqlMapper(out, className, fields,table) {
    out.println "<?xml version="1.0" encoding="UTF-8"?>"
    out.println "<!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN""
    out.println "		"http://mybatis.org/dtd/mybatis-3-mapper.dtd">"
    out.println "<mapper namespace="${daoNameSpace}">"
    out.println "	<resultMap id="BaseResultMap" type="${modelNameSpace}">"
    fields.each() {
        if(it.isKey){
            out.println "		<id column="${it.colName}" jdbcType="${it.typeOrg.toUpperCase()}" property="${it.name}" />"
        }else{
            out.println "		<result column="${it.colName}" jdbcType="${it.typeOrg.toUpperCase()}" property="${it.name}" />"
        }
    }
    out.println "	</resultMap>"
    def filesId = firstCharToLow(className)+"Fields";
    out.println "	<sql id="${filesId}">"
    def filesIdStr = ""
    def count = 1
    def keyColumnName = ""
    def keyName = ""
    def keyType = ""
    fields.each(){
        if(filesIdStr==""){
            filesIdStr = it.colName
        }else{
            filesIdStr = filesIdStr+",${it.colName}"
            if(count==10 || count == 20 || count == 30 || count == 40){
                filesIdStr = filesIdStr+"
		"
            }
        }
        if(it.isKey){
            keyColumnName = it.colName
            keyName = it.name
            keyType = it.type
        }
        count = count+1
    }
    out.println "		${filesIdStr}"
    out.println "	</sql>"
    if(keyColumnName != ""){
        out.println "	<select id="get${className}By${firstCharToUp(keyName)}" parameterType="${keyType}" resultType="${modelNameSpace}">"
        out.println "		SELECT"
        out.println "		<include refid="${filesId}" />"
        out.println "		FROM ${tableName} WITH(NOLOCK)"
        out.println "		WHERE ${keyColumnName} = #{${keyName}}"
        out.println "	</select>"
    }
    out.println "</mapper>"
}

def calcFields(table) {
    // 加载当前数据库主键
    def primaryKey = ""
    def prKey = DasUtil.getPrimaryKey(table);
    if (prKey != null) {
        def keyRef = prKey.getColumnsRef();
        if (keyRef != null) {
            def it = keyRef.iterate();
            while (it.hasNext()) {
                // 默认只处理单主键
                primaryKey = it.next();
            }
            primaryKey = javaName(primaryKey, false);
        }
    }

    DasUtil.getColumns(table).reduce([]) { fields, col ->
        def spec = Case.LOWER.apply(col.getDataType().getSpecification())
        def typeStrOrg = spec.toString().replaceAll(/((.*?))/, "")
        def typeStr = typeMapping.find { p, t -> p.matcher(spec).find() }.value
        def colName = col.getName()
        def nameTemp = javaName(colName, false)
        // 当前列是否为主键
        def isPrimaryKey = nameTemp.equals(primaryKey)
        def comm =[
                colName : colName,
                name :  nameTemp,
                type : typeStr,
                typeOrg  : typeStrOrg,
                commoent: col.getComment(),
                isKey: isPrimaryKey,
                annos: "@Column(name = ""+col.getName()+"" )"]
        fields += [comm]
    }
}

// 去掉自定义的字符串，下面的javaName为原始的方法，不去除表头
def javaClassName(str, capitalize) {
    def tempStr = str
    // 去除开头的指定字符串
    tableHeaderRemoved.each(){
        it = it.toLowerCase()
        if (isNotEmpty(it)){
            if (it.size() < tempStr.size()){
                def headTemp = tempStr[0..it.size() - 1]
                def underLineFlag = tempStr[it.size()..it.size()]
                if (it == headTemp.toLowerCase() && underLineFlag == "_") {
                    tempStr = tempStr[it.size()..tempStr.size() - 1]
                    return true
                }
            }
        }
    }
    def s = com.intellij.psi.codeStyle.NameUtil.splitNameIntoWords(tempStr)
            .collect { Case.LOWER.apply(it).capitalize() }
            .join("")
            .replaceAll(/[^p{javaJavaIdentifierPart}[_]]/, "_")
    capitalize || s.length() == 1? s : Case.LOWER.apply(s[0]) + s[1..-1]
}

def javaName(str, capitalize) {
    def s = com.intellij.psi.codeStyle.NameUtil.splitNameIntoWords(str)
            .collect { Case.LOWER.apply(it).capitalize() }
            .join("")
            .replaceAll(/[^p{javaJavaIdentifierPart}[_]]/, "_")
    capitalize || s.length() == 1? s : Case.LOWER.apply(s[0]) + s[1..-1]
}

def isNotEmpty(content) {
    return content != null && content.toString().trim().length() > 0
}

static String changeStyle(String str, boolean toCamel){
    if(!str || str.size() <= 1)
        return str

    if(toCamel){
        String r = str.toLowerCase().split('_').collect{cc -> Case.LOWER.apply(cc).capitalize()}.join('')
        return r[0].toLowerCase() + r[1..-1]
    }else{
        str = str[0].toLowerCase() + str[1..-1]
        return str.collect{cc -> ((char)cc).isUpperCase() ? '_' + cc.toLowerCase() : cc}.join('')
    }
}

//首字母转成大写
static String firstCharToUp(String str){
    String r = str[0..0]
    if(((char)r).isLowerCase()){
        return "${r.toUpperCase()}${str[1..str.length()-1]}"
    }
    return str
}

//首字母转为小写
static String firstCharToLow(String str){
    String r = str[0..0]
    if(((char)r).isUpperCase()){
        return "${r.toLowerCase()}${str[1..str.length()-1]}"
    }
    return str
}

static String genSerialID()
{
    return "	private static final long serialVersionUID =  "+Math.abs(new Random().nextLong())+"L;"
}

其中项目配置路径需要注意，项目路径不能包含中文，..\models下可以包含子文件夹，但不需要把文件名写在配置中。

modelCreateDir = "mybatis-generator-test\code-generato\src\main\java\com\zsy\codegenerato\models"

3.使用脚本生成代码，生成顺序为DO=>DAO=>SqlMapper，因为DAO文件需要用到DO的地址，SqlMapper需要用到DO以及DAO文件地址。

右键选中表，选择相应的脚本文件：

 选择需要存放文件的文件夹，点击OK即可，生成其他文件步骤也是一样的。

小结：使用此方法最大的好处就是可以按需生成，而且不需要将生成代码整合在项目当中。一般使用此方法生成DO文件，而DAO跟SqlMapper根据业务需要自己编写。

参考资料：

 https://blog.csdn.net/Javajiaojiaozhe/article/details/107062497