如何在 IDEA 中使用自定义模板生成实体类

﹏ヽ暗。殇╰゛Y 2023-09-30 22:21 17阅读 0赞

![44fd9e27af8746d68dfa3a0cbec9036d.png][]

然后在idea左侧，项目那一栏，拉到最下面，会看见：

新建 Generate MyPOJOs.groovy，其他名字也可以

![d32d476260e64831a4980c21364d046e.png][]

根据实际情况对模板进行编辑

一般情况，我们希望实体类满足以下需求：

*  使用 Lombok 的 `@Data`、`@NoArgsConstructor` 和 `@AllArgsConstructor` 注解
 *  使用 `@TableName` 注解让实体类应该和数据库的表名对应
 *  实现 `Serializable` 接口

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
    
    /*
     * 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/)       : "Double",
            (~/(?i)datetime|timestamp|date|time/)    : "LocalDateTime",
            (~/(?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, 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 com.baomidou.mybatisplus.annotation.IdType;"
        out.println "import com.baomidou.mybatisplus.annotation.TableId;"
        out.println "import com.baomidou.mybatisplus.annotation.TableName;"
        out.println "import lombok.AllArgsConstructor;"
        out.println "import lombok.Data;"
        out.println "import lombok.NoArgsConstructor;"
        out.println ""
        out.println "import java.io.Serializable;"
        Set types = new HashSet()
    
        fields.each() {
            types.add(it.type)
        }
    
        if (types.contains("LocalDateTime")) {
            out.println "import java.time.LocalDateTime;"
        }
    
        if (types.contains("InputStream")) {
            out.println "import java.io.InputStream;"
        }
        out.println ""
        out.println "/**\n" +
                " * @Description  \n" +
                " * @Date "+ new SimpleDateFormat("yyyy-MM-dd").format(new Date()) + " \n" +
                " */"
        out.println ""
        out.println "@Data"
        out.println "@NoArgsConstructor"
        out.println "@AllArgsConstructor"
        out.println "@TableName(\""+table.getName() +"\" )"
        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/**"
    //            out.println "\t * ${it.commoent.toString()}"
    //            out.println "\t */"
    //        }
    //
    //        if (it.annos != "") out.println "   ${it.annos.replace("[@Id]", "")}"
    
            // 输出成员变量
            out.println "\tprivate ${it.type} ${it.name};"
        }
    
        // 输出get/set方法
    //    fields.each() {
    //        out.println ""
    //        out.println "\tpublic ${it.type} get${it.name.capitalize()}() {"
    //        out.println "\t\treturn this.${it.name};"
    //        out.println "\t}"
    //        out.println ""
    //
    //        out.println "\tpublic void set${it.name.capitalize()}(${it.type} ${it.name}) {"
    //        out.println "\t\tthis.${it.name} = ${it.name};"
    //        out.println "\t}"
    //    }
        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: "\t@Column(name = \""+col.getName()+"\" )"]
            if("id".equals(Case.LOWER.apply(col.getName())))
                comm.annos +=["@TableId"]
            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 "\tprivate static final long serialVersionUID =  "+Math.abs(new Random().nextLong())+"L;"
    }

[44fd9e27af8746d68dfa3a0cbec9036d.png]: https://img-blog.csdnimg.cn/44fd9e27af8746d68dfa3a0cbec9036d.png
[d32d476260e64831a4980c21364d046e.png]: https://img-blog.csdnimg.cn/d32d476260e64831a4980c21364d046e.png