IDEA通过Generate POJOs.groovy生成POJO对象


1.链接数据库

datagrip,idea利用自带插件Generate POJOs.groovy生成pojo类。idea可以连接数据库,datagrip集成在里面了

2.编辑生成规则

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/)       : "BigDecimal",
        (~/(?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)
  //当是maven项目的时候,需要解开下面的注释
  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;"
  out.println "import lombok.Data;"
  Set types = new HashSet()

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

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

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

  if (types.contains("InputStream")) {
    out.println "import java.io.InputStream;"
  }
  out.println ""
  out.println "/**\n" +
          " * generated by Wayen-Generate POJOs.groovy  \n" +
          " * @author  Wayen\n" + //1. 修改idea为自己名字
          " * @date " + new SimpleDateFormat("yyyy-MM-dd HH:mm:ss").format(new Date()) + " \n" +
          " */"
  out.println ""
  out.println "@Data"
  out.println "@Entity"
  out.println "@Table ( name =\"" + table.getName() + "\" )" //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)  , schema = ""
  out.println "public class $className  implements Serializable {"
  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 "\[email protected]"

    if (it.annos != "") out.println "   ${it.annos.replace("[@Id]", "")}"


    // 输出成员变量
    out.println "\tprivate ${it.type} ${it.name};"
  }
  out.println ""
  out.println genSerialID()
  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   : "\[email protected](name = \"" + col.getName() + "\" )"]
    if ("id".equals(Case.LOWER.apply(col.getName())))
      comm.annos += ["@Id"]
    fields += [comm]
  }
}

// 这里是处理数据库表前缀的方法,这里处理的是t_xxx命名的表
// 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,
// 如果你不需要去掉表的前缀,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('')
  }
}

//生成序列化的serialVersionUID
static String genSerialID() {
  return "\tprivate static final long serialVersionUID =  1L;"
}

3.生成对象类


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