自定义修改IDEA SpringJPA实体模板

生成SpringJPA的实体可以使用编译器中自带的配置：
Project Structure>> Facets ，选择JPA即可

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然后打开Persistence，右键选择，见下图：

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但是得到的实体类不太令人满意，所以这里我们可以选择利用groovy脚本生成实体类，选择Scratches>>Generate POJOs.groovy：

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脚本可参考下面代码：

import com.intellij.database.model.DasTable
import com.intellij.database.model.ObjectKind
import com.intellij.database.util.Case
import com.intellij.database.util.DasUtil

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

packageName = "com.demo;"  //这里要换成自己项目 实体的包路径
typeMapping = [
        (~/(?i)int/)                      : "Integer",  //数据库类型和Jave类型映射关系
        (~/(?i)float|double|decimal|real/): "Double",
        (~/(?i)bool|boolean/)             : "Boolean",
        (~/(?i)datetime|timestamp/)       : "java.util.Date",
        (~/(?i)date/)                     : "java.sql.Date",
        (~/(?i)time/)                     : "java.sql.Time",
        (~/(?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)
  new File(dir, className + ".java").withPrintWriter { out -> generate(out, table, className, fields) }
}

def generate(out, table, className, fields) {
  def tableName = table.getName()
  out.println "package $packageName"
  out.println ""
  out.println "import lombok.Data;"
  out.println ""
  out.println "import javax.persistence.*;"
  out.println "import java.io.Serializable;"
  out.println ""
  out.println "@Data"
  out.println "@Entity"
  out.println "@Table(name = \"$tableName\")"
  out.println "public class $className implements Serializable {"
  out.println ""


  if ((tableName + "_id").equalsIgnoreCase(fields[0].colum) || "id".equalsIgnoreCase(fields[0].colum)) {
    out.println "\t@Id"
    out.println "\t@GeneratedValue(strategy=GenerationType.IDENTITY)"
  }

  fields.each() {
    if (it.annos != "") out.println "  ${it.annos}"

    out.println "\t@Column(name = \"${it.colum}\")"

    if (it.colum != it.name) {
      out.println "\tprivate ${it.type} ${it.colum};"
    }else {
      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
    fields += [[
                       name : javaName(col.getName(), false),
                       colum: col.getName(),
                       type : typeStr,
                       annos: ""]]
  }
}

def javaName(str, capitalize) {
  def s = str.split(/(?<=[^\p{IsLetter}])/).collect { Case.LOWER.apply(it).capitalize() }
          .join("").replaceAll(/[^\p{javaJavaIdentifierPart}]/, "_").replaceAll(/_/, "")
  capitalize || s.length() == 1 ? s : Case.LOWER.apply(s[0]) + s[1..-1]
}

这里提一句，我也是参考了网上其他人的例子，但是发现生成的实体有问题，没有@Column注解，而且字段名与数据库也不匹配，所以修改了一下。（不知道是我编辑器的问题还是什么原因，不过以上规则确实是我期望得到的）

然后从Database选择要生成的表实体：

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import lombok.Data;

import javax.persistence.*;
import java.io.Serializable;

@Data
@Entity
@Table(name = "t_test")
public class TTest implements Serializable {

    @Id
    @GeneratedValue(strategy=GenerationType.IDENTITY)
    @Column(name = "id")
    private Integer id;

    @Column(name = "code")
    private String code;

    @Column(name = "name")
    private String name;

    @Column(name = "time")
    private java.util.Date time;

    @Column(name = "lastUpdateTime")
    private java.util.Date lastUpdateTime;

}

对了，还要在pom文件中加入lombok的依赖；

        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <scope>provided</scope>
        </dependency>

参考：https://www.jianshu.com/p/44bb7e25f5c7

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