idea 逆向生成jpa 实体类

本文参考操作流程,记录下亲测可用的groovy 脚本,供以后查用及大家分享学习.

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

import java.io.*
import java.text.SimpleDateFormat
import java.util.Date

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

//自动根据选择文件夹获取
packageName = ""
typeMapping = [
        (~/(?i)tinyint|smallint|mediumint/)      : "Integer",
        (~/(?i)int/)                             : "Long",
        (~/(?i)float|double|decimal|real/)       : "Double",
        (~/(?i)bool|boolean/)                    : "Boolean",
        (~/(?i)datetime|timestamp/)              : "Date",
        (~/(?i)date/)                            : "java.sql.Date",
        (~/(?i)time/)                            : "java.sql.Time",
        (~/(?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, table, className, fields) }
    //中文注释会乱码
    // new File(dir, className + ".java").withPrintWriter { out -> generate(out, table, className, fields) }
}


// 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, 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 "import java.util.Date;"
    out.println ""

    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;"
    }

    /*添加注释*/
    out.println ""
    out.println "/**\n" +
            " * @Description  \n" +
            " * @Author  MichaelZ\n" +
            " * @Date " + new SimpleDateFormat("yyyy-MM-dd").format(new Date()) + " \n" +
            " */"
    out.println ""


    out.println "@Data"
    out.println "@Entity"
    out.println "@Table(name = \"$tableName\")"
    out.println "public class $className  implements Serializable {"
    out.println ""
    out.println genSerialID()

    // 判断自增
    if ((tableName + "_id").equalsIgnoreCase(fields[0].colum) || "id".equalsIgnoreCase(fields[0].colum)) {
        out.println "\[email protected]"
        out.println "\[email protected](strategy=GenerationType.IDENTITY)"
    }
    fields.each() {
        // 输出注释
        if (isNotEmpty(it.comment)) {
            out.println "\t/**"
            out.println "\t * ${it.comment.toString()}"
            out.println "\t */"
            out.println "\[email protected](value = \"$it.comment\")"
        }

        if (it.annos != "") out.println "  ${it.annos}"
        out.println "\[email protected](name = \"${it.colum}\",columnDefinition =  \"${it.columnDefinition}\") "
        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,
                           comment         : col.getComment(),
                           annos           : "",
                           columnDefinition: col.getDataType()
                   ]]
    }
}

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]
}


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

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

生成的java 实体类如下:

package com.xxx.entity;

import java.io.Serializable;
import java.util.Date;

import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.Table;

import io.swagger.annotations.ApiModelProperty;
import lombok.Data;

/**
 * @Description  
 * @Author  MichaelZ
 * @Date 2019-10-14 
 */

@Data
@Entity
@Table(name = "test_table")
public class TestTableimplements Serializable {

	private static final long serialVersionUID =  1399483426396845015L;
	@Id
	@GeneratedValue(strategy=GenerationType.IDENTITY)
	@Column(name = "id",columnDefinition =  "int(11)") 
	private Long id;

	/**
	 * 小区id
	 */
	@ApiModelProperty(value = "小区id")
	@Column(name = "area_id",columnDefinition =  "int(11)") 
	private Long areaId;
	...
}