使用idea的groovy脚本自动创建Jpa的实体

使用idea的groovy脚本自动创建Jpa的实体

1. 选中数据库的表；
2. 右击选择Scripted Extension中的Go to scripts diretory；
3. 新建一个文件，名称为：JpaGenerate POJOs.groovy；
4. 复制粘贴如下内容；
5. 选中数据库中需要新建entity的表；
6. 右击选中Scripted Extension中的JpaGenerate POJOs.groovy执行；
7. 在指定目录下生成驼峰命名的实体对象；
8. 需要修改生成内容的，可以看看脚本内容，进行修改。

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.io.*
import java.text.SimpleDateFormat
import java.time.LocalDate

/*
 * Available context bindings:
 *   SELECTION   Iterable<DasObject>
 *   PROJECT     project
 *   FILES       files helper
 */
packageName = "com.cyneck.web.entity"
// 此处指定对应的类型映射，可按需修改，目前tinyint如果要映射到自定义枚举类型，只能手动修改
typeMapping = [
        (~/(?i)bigint/)                         : "Long",
        (~/(?i)smallint|mediumint|tinyint|int/) : "Integer",
        (~/(?i)bool|bit/)                       : "Boolean",
        (~/(?i)float|double|decimal|real/): "BigDecimal",
        (~/(?i)time|datetime|timestamp/)  : "LocalDateTime",
        (~/(?i)date/)                     : "LocalDate",
        (~/(?i)blob|mediumblob|binary|bfile|clob|raw|image/): "Byte[]",
        (~/(?i)text|mediumtext/)          : "String",
        (~/(?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 = javaClassName(table.getName(), true)
    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) {
    def tableName = table.getName()
    out.println "package $packageName"
    out.println ""
    out.println "import javax.persistence.*;"
    /*out.println "import javax.persistence.Entity;"
    out.println "import javax.persistence.Table;"*/
    out.println "import java.io.Serializable;"
    out.println "import lombok.Data;"
    out.println "import org.hibernate.annotations.GenericGenerator;"
    /*out.println "import lombok.AllArgsConstructor;"
    out.println "import lombok.Builder;"
    out.println "import lombok.NoArgsConstructor;"*/

    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 ""
    // 添加类注释
    out.println "/**"
    // 如果添加了表注释，会加到类注释上
    if (isNotEmpty(table.getComment())) {
        out.println " * " + table.getComment()
    }
    out.println " *"
    out.println " * @author Eric.Lee"
    out.println " * @since " + new SimpleDateFormat("yyyy-MM-dd HH:mm:ss").format(new Date())
    out.println " */"

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


    // 判断自增
    /*if ((tableName + "_id").equalsIgnoreCase(fields[0].colName) || "id".equalsIgnoreCase(fields[0].colName)) {
        out.println "	@Id"
        out.println "	@GeneratedValue(generator = "idGenerator")"
        out.println "	@GenericGenerator(name = "idGenerator", strategy = ChiticCoreConstant.ID_GENERATOR_COMMON)"
    }*/


    fields.each() {
        out.println ""
        // 输出注释
        if (isNotEmpty(it.commoent)) {
            out.println "	/**"
            out.println "	 * ${it.commoent.toString()}"
            out.println "	 */"
        }

        if (it.annos != ""){
            if (it.annos.contains("[@Id]")){
                out.println "	@Id"
                out.println "	@GeneratedValue(generator = "idGenerator")"
                out.println "	@GenericGenerator(name = "idGenerator", strategy = "uuid")"
            }
            out.println "   ${it.annos.replace("[@Id]", "")}"
        }


        // 输出成员变量
        out.println "	private ${it.type} ${it.name};"
    }

    // 输出get/set方法
//    fields.each() {
//        out.println ""
//        out.println "	public ${it.type} get${it.name.capitalize()}() {"
//        out.println "		return this.${it.name};"
//        out.println "	}"
//        out.println ""
//
//        out.println "	public void set${it.name.capitalize()}(${it.type} ${it.name}) {"
//        out.println "		this.${it.name} = ${it.name};"
//        out.println "	}"
//    }
    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: "	@Column(name = ""+col.getName()+"")"]
        if("id".equals(Case.LOWER.apply(col.getName())))
            comm.annos +=["@Id"]
        fields += [comm]
    }
}

// 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 "	private static final long serialVersionUID =  "+Math.abs(new Random().nextLong())+"L;"
}