IDEA使用Hibernate生成帶註解的實體類和VO類 詳細步驟

前言：idea 功能很強大，以前不知道有這樣的提升工作效率的方法，雖然有的工具確實可以直接生成實體類，mapper文件，還有dao接口，但是個人覺得涉及到複雜業務還是隻生成實體類比較好，後面部分就自己搞定就可以了。

生成的VO類效果：

一、連接數據庫

打開項目：

1、點擊右側的datesource圖標，要是沒有該圖標，請去自行百度

2、點擊 + 號

3、選擇 datasource

4、選擇 mysql

1、填寫一個連接名，隨便填什麼都行

2、不用選擇，默認就行

3、填寫數據庫連接的 IP地址，比如本地數據庫可以填寫：localhost或者127.0.0.1

4、填寫數據庫開放的端口號，一般沒設置的話默認都是3306

5、填寫你需要連接的數據庫名

6、填寫數據庫的用戶名

7、填寫數據庫密碼

8、這裏會有一個驅動需要點擊下載，圖中是已經下載好了

9、填寫自己的數據庫連接url，然後可以點擊9所在按鈕進行測試連接，本地連接失敗檢查是否開啓了mysql服務

 

連接好了如上圖所示，可以看到自己的數據庫和表，選擇一個表右鍵，網上教程一般到這裏結束，都是選擇說Generate POJOs.groovy，然後在彈出窗口選擇需要生成的文件夾所在即可。

我選擇一張表進行生成示例如下：

表明去除了“_”然後以駝峯方式生成了類名，而且開始的package 路徑也不對，重點是沒有註釋，沒有註釋，沒有註釋！

網上搜了一些方法，都不太行，要不就是到處報錯，沒轍只能自己瞎琢磨。沒想到最後也不難，下面就是實現：

右鍵選擇表，在選擇Generate POJOs.groovy 的下面那一項：

進來只有Generate POJOs.groovy，右鍵新建另外一個比如我的叫做：MyGeneratePOJOs.groovy，裏面內容如下：

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/)    : "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 = javaClassName(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) }
}

// 獲取包所在文件夾路徑
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.*;"
    //out.println "import javax.persistence.Column;"
    //out.println "import javax.persistence.Entity;"
    //out.println "import javax.persistence.Table;"
    //out.println "import java.io.Serializable;"
    //out.println "import lombok.Getter;"
    //out.println "import lombok.Setter;"
    //out.println "import lombok.ToString;"
    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 ""
    out.println "/**\n" +
            " * @Description  \n" +
            " * @Author  lqk\n" +
            " * @Date "+ new SimpleDateFormat("yyyy-MM-dd").format(new Date()) + " \n" +
            " */"
    out.println ""
    //out.println "@Setter"
    //out.println "@Getter"
    //out.println "@ToString"
    out.println "@Entity"
    out.println "@Table ( name =\""+table.getName() +"\" )"
    out.println "public class $className  {"
    //out.println ""
    //out.println genSerialID()
    fields.each() {
        out.println ""
        // 輸出註釋
        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]", "")}"

        // 輸出成員變量
        out.println "\tprivate ${it.type} ${it.name};"
    }

    // 輸出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 +=["@Id"]
        fields += [comm]
    }
}

// 處理類名（這裏是因爲我的表都是以t_命名的，所以需要處理去掉生成類名時的開頭的T，
// 如果你不需要那麼請查找用到了 javaClassName這個方法的地方修改爲 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}[_]]/, "_")
    // 去除開頭的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;"
}

生成VO類的文件，右鍵新建另外一個比如我的叫做：VOGeneratePOJOs.groovy，裏面內容如下：

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/)    : "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 = javaClassName(table.getName(), true) + "VO"
    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) }
}

// 獲取包所在文件夾路徑
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.*;"
    //out.println "import javax.persistence.Column;"
    //out.println "import javax.persistence.Entity;"
    //out.println "import javax.persistence.Table;"
    //out.println "import java.io.Serializable;"
    //out.println "import lombok.Getter;"
    //out.println "import lombok.Setter;"
    //out.println "import lombok.ToString;"
    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 ""
    out.println "/**\n" +
            " * @Description  \n" +
            " * @Author  lqk\n" +
            " * @Date "+ new SimpleDateFormat("yyyy-MM-dd").format(new Date()) + " \n" +
            " */"
    out.println ""
    //out.println "@Setter"
    //out.println "@Getter"
    //out.println "@ToString"
    //out.println "@Entity"
    //out.println "@Table ( name =\""+table.getName() +"\" )"
    out.println "public class $className {"
    //out.println ""
    //out.println genSerialID()
    fields.each() {
        out.println ""
        // 輸出註釋
        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]", "")}"

        // 輸出成員變量
        out.println "\tprivate ${it.type} ${it.name};"
    }

    // 輸出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 +=["@Id"]
        fields += [comm]
    }
}

// 處理類名（這裏是因爲我的表都是以t_命名的，所以需要處理去掉生成類名時的開頭的T，
// 如果你不需要那麼請查找用到了 javaClassName這個方法的地方修改爲 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}[_]]/, "_")
    // 去除開頭的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;"
}