IDEA自定义Generate POJOs.groovy生成实体 - JPA+Lombok的模板

最近做新项目，项目中没有引入自动生成的代码，要手写实体，好麻烦，就上网搜了一下IDEA工具有没有什么插件可以自动生成，没想到好真的有，用这篇文章记录一下整个过程，毕竟中间还是遇到了好几个问题。

1、打开Database工具Tab页，连接数据库，找到要生成实体的表，右键选择按照那个模板生成就可以了。

但是，网上说有人没有这些，他们说重新下载一个新的版本就可以了，我也没遇到，所有也不是很清楚。

2、现在生成的操作过程都清楚了，下面就是怎么自定义生成模板，我自己修改了一份JPA实体模板，如下：

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.sql.Date
import java.time.LocalDateTime
import java.time.format.DateTimeFormatter


/*
 * Available context bindings:
 *   SELECTION   Iterable<DasObject>
 *   PROJECT     project
 *   FILES       files helper
 */

packageName = "com.sample;"

typeMapping = [
        (~/(?i)int|tinyint|smallint|mediumint/)  : "Integer",
        (~/(?i)bool|bit/)                        : "Boolean",
        (~/(?i)float|double|decimal|real|number/): "BigDecimal",
        (~/(?i)datetime|timestamp|date|time/)    : "Date",
        (~/(?i)binary|bfile|raw|image/)          : "InputStream",
        (~/(?i)blob|clob/)                       : "lob",
        (~/(?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)
  // 解决乱码问题
  new File(dir, className + ".java").withPrintWriter("utf-8") { 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.*;"
  out.println "import java.io.Serializable;"
  out.println "import lombok.*;"

  Set types = new HashSet()

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

  if (types.contains("BigDecimal")) {
    out.println "import java.math.BigDecimal;"
  }

  if (types.contains("Date")) {
    out.println "import java.util.Date;"
    out.println "import org.hibernate.annotations.GenericGenerator;"
    out.println "import org.hibernate.annotations.UpdateTimestamp;"
    out.println "import org.hibernate.annotations.CreationTimestamp;"
  }

  if (types.contains("InputStream")) {
    out.println "import java.io.InputStream;"
  }
  out.println ""
  out.println "/**\n" +
          " * @Author: zhangjian\n" +
          " * @Date: " +  LocalDateTime.now().format(DateTimeFormatter.ofPattern("yyyy/MM/dd HH:mm")) +"\n"+
          " */"
  out.println "@Data"
  out.println "@Entity"
  out.println "@Table (name = \"" + table.getName() + "\")"
  out.println "@Builder"
  out.println "@NoArgsConstructor"
  out.println "@AllArgsConstructor"
  out.println "public class $className implements Serializable {"
  out.println ""
  out.println genSerialID()
  fields.each() {
    out.println ""
    // 输出注释
    if (isNotEmpty(it.commoent)) {
      out.println "\t/**${it.commoent.toString()}*/"
    }

    if (it.annos != "") out.println "   ${it.annos}"
    // 输出成员变量
    out.println "\tprivate ${it.type} ${it.name};"
  }
  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    : changeStyle(fileName(col.getName(), false), true),
            type    : typeStr,
            commoent: col.getComment(),
            annos   : "\t@Column(name = \"" + col.getName() + "\" )"]
    if ("id".equals(Case.LOWER.apply(col.getName()))){
      comm.annos = "\t@Id\n"
      //自增主键需要
      comm.annos += "\t@GenericGenerator(name = \"idGen\", strategy = \"uuid\")\n"
      comm.annos += "\t@GeneratedValue(generator = \"idGen\")\n"
      comm.annos += "\t@Column(name = \"id\")"
    }
    if ("create_time".equals(Case.LOWER.apply(col.getName()))){
      comm.annos += "\n\t@CreationTimestamp"
      comm.annos += "\n\t@Temporal(TemporalType.TIMESTAMP)"
    }
    if ("update_time".equals(Case.LOWER.apply(col.getName()))){
      comm.annos += "\n\t@UpdateTimestamp"
      comm.annos += "\n\t@Temporal(TemporalType.TIMESTAMP)"
    }
    if("lob".equals(typeStr)) {
      comm.type = "String";
      comm.annos = "\t@Lob\n"
      comm.annos += "\t@Basic(fetch = FetchType.EAGER)\n"
      comm.annos += "\t@Column(name = \"" + col.getName() + "\", columnDefinition = \"CLOB\")"
    }
    fields += [comm]
  }
}

def javaName(str, capitalize) {
  def s = com.intellij.psi.codeStyle.NameUtil.splitNameIntoWords(str)
          .collect { Case.LOWER.apply(it).capitalize() }
          .join("")
          .replaceAll(/[^\p{javaJavaIdentifierPart}[_]]/, "_")
  // 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，如果不用处理注释掉下面这句代码
  s = s[1..s.size() - 1]
  capitalize || s.length() == 1? s : Case.LOWER.apply(s[0]) + s[1..-1]
}

def fileName(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 "\tprivate static final long serialVersionUID =  " + Math.abs(new Random().nextLong()) + "L;";
}

将修改你的模板放到下图这个位置就可以了

你可以点击这个按钮来定位到这个位置

好了，这样你就不用在手写实体了