如何使用IDEA的groovy脚本文件生成带JPA注解的实体类(图文详解)

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.text.SimpleDateFormat
 
/*
 * Available context bindings:
 * SELECTION Iterable<DasObject>
 * PROJECT project
 * FILES files helper
 */
packageName = ""
typeMapping = [
 (~/(?i)tinyint|smallint|mediumint/) : "Integer",
 (~/(?i)int/)    : "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"
]
 
 
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 = javaName(table.getName(), true)
 def fields = calcFields(table)
 packageName = getPackageName(dir)
 PrintWriter printWriter = new PrintWriter(new OutputStreamWriter(new FileOutputStream(new File(dir, className + ".java")), "UTF-8"))
 printWriter.withPrintWriter { out -> generate(out, className, fields, table) }
 
// new File(dir, className + ".java").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 javax.persistence.Column;"
 out.println "import javax.persistence.Entity;"
 out.println "import javax.persistence.Table;"
 out.println "import javax.persistence.Id;"
 out.println "import javax.persistence.GeneratedValue;"
 out.println "import java.io.Serializable;"
 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 "/**\n" +
  " * @Description \n" +
  " * @Author idea\n" + //1. 修改idea为自己名字
  " * @Date " + new SimpleDateFormat("yyyy-MM-dd").format(new Date()) + " \n" +
  " */"
 out.println ""
 out.println "@Entity"
 out.println "@Table ( name =\"" + table.getName() + "\" , schema = \"\")" //2. schema = \"后面添加自己的表空间名称(mysql可以不添加, 不用这个schema属性也行)
 out.println "public class $className implements Serializable {"
 out.println ""
 out.println genSerialID()
 fields.each() {
 out.println ""
 // 输出注释
 if (isNotEmpty(it.commoent)) {
  out.println "\t/**"
  out.println "\t * ${it.commoent.toString()}"
  out.println "\t */"
 }
 
 if ((it.annos+"").indexOf("[@Id]") >= 0) out.println "\t@Id"
 
 if (it.annos != "") out.println " ${it.annos.replace("[@Id]", "")}"
 
 
 // 输出成员变量
 out.println "\tprivate ${it.type} ${it.name};"
 }
 
 // 输出get/set方法
 fields.each() {
 out.println ""
 out.println "\tpublic ${it.type} get${it.name.capitalize()}() {"
 out.println "\t\treturn this.${it.name};"
 out.println "\t}"
 out.println ""
 
 out.println "\tpublic void set${it.name.capitalize()}(${it.type} ${it.name}) {"
 out.println "\t\tthis.${it.name} = ${it.name};"
 out.println "\t}"
 }
 
 // 输出toString方法
 out.println ""
 out.println "\t@Override"
 out.println "\tpublic String toString() {"
 out.println "\t\treturn \"TpApiConfig{\" +"
 fields.each() {
 out.println "\t\t\t\t\"${it.name}='\" + ${it.name} + '\\'' +"
 }
 out.println "\t\t\t\t'}';"
 out.println "\t}"
 
 out.println ""
 out.println "}"
}
 
def calcFields(table) {
 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 comm = [
  colName : col.getName(),
  name : javaName(col.getName(), false),
  type : typeStr,
  commoent: col.getComment(),
  annos : "\t@Column(name = \"" + col.getName() + "\" )"]
 if ("id".equals(Case.LOWER.apply(col.getName())))
  comm.annos += ["@Id"]
 fields += [comm]
 }
}
 
// 已经修改为使用javaName, 如果有需要可以在def className = javaName(table.getName(), true)中修改为javaClassName
// 处理类名（这里是因为我的表都是以t_命名的，所以需要处理去掉生成类名时的开头的T，
// 如果你不需要那么请查找用到了 javaClassName这个方法的地方修改为 javaName 即可）
def javaClassName(str, capitalize) {
 def s = com.intellij.psi.codeStyle.NameUtil.splitNameIntoWords(str)
  .collect { Case.LOWER.apply(it).capitalize() }
  .join("")
  .replaceAll(/[^\p{javaJavaIdentifierPart}[_]]/, "_")
 // 去除开头的T http://developer.51cto.com/art/200906/129168.htm
 s = s[1..s.size() - 1]
 capitalize || s.length() == 1 ? s : Case.LOWER.apply(s[0]) + s[1..-1]
}
 
def javaName(str, capitalize) {
// def s = str.split(/(?<=[^\p{IsLetter}])/).collect { Case.LOWER.apply(it).capitalize() }
//  .join("").replaceAll(/[^\p{javaJavaIdentifierPart}]/, "_")
// capitalize || s.length() == 1? s : Case.LOWER.apply(s[0]) + s[1..-1]
 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 "\tprivate static final long serialVersionUID = " + Math.abs(new Random().nextLong()) + "L;"
}