Cglib根据数据库表数据动态生成对象

最近有个任务：根据查询SQL直接导出报表

实现关键是，怎么根据sql查询的数据动态生成对象列表，想到Cglib动态代理实现

废话少说，上代码：

定义动态生成Java Bean类：

import java.util

import net.sf.cglib.beans.{BeanGenerator, BeanMap}

/**  * 动态Bean生成  *  * @author BarryWang create at 2018/6/19 11:54  * @version 0.0.1  */class DynamicBean {  private var `object`: AnyRef = null  private var beanMap: BeanMap = null

def this(fieldTypeMap: util.Map[String, AnyRef]) {    this()    this.`object` = generateObject(fieldTypeMap)    this.beanMap = BeanMap.create(this.`object`)  }

/**    * 生成对象    *    * @param fieldTypeMap 域及类型Map    * @return    */  private def generateObject(fieldTypeMap: util.Map[String, AnyRef]) = {    val generator = new BeanGenerator    val keySet = fieldTypeMap.keySet    val i = keySet.iterator    while (i.hasNext) {      val key = i.next      generator.addProperty(key, fieldTypeMap.get(key).asInstanceOf[Class[_]])    }    generator.create  }

/**    * 设置域值    *    * @param filedName 域名    * @param value     值    */  def setValue(filedName: String, value: AnyRef): Unit = {    this.beanMap.put(filedName, value)  }

/**    * 获取域值    *    * @param fieldName 域名    * @return    */  def getValue(fieldName: String): AnyRef = this.beanMap.get(fieldName)

/**    * 最终对象    *    * @return    */  def getObject: AnyRef = this.`object`}

SQL查询数据转对象：

  /**    * 根据数据查出数据转成对象列表    * @param database 数据库    * @param querySql 查询SQl    * @return    */  def getObjectDataList(database: String, querySql: String): ArrayList[Object] = {    println(s"database:${database} sql:${querySql}")    val rs = DataGenerator.getResultSet(database, querySql)    val md = rs.getMetaData    val colCount = md.getColumnCount    val fieldValMap = new JavaHashMap[String, AnyRef]()    for (i <- 0 to colCount - 1) {      fieldValMap.put(underLineToCamel(md.getColumnName(i + 1)), Class.forName("java.lang.String"))    }    // 生成动态 Bean    val returnList = new ArrayList[Object]();    while (rs.next()) {      val objectBean = new DynamicBean(fieldValMap);      for (i <- 0 to colCount - 1) {        val data = getData(md, i+1, rs)        objectBean.setValue(underLineToCamel(md.getColumnName(i + 1)), data)      }//      println(">> " + objectBean.getValue("zhCnName"))      returnList.add(objectBean.getObject)    }    rs.close()    returnList  }

def underLineToCamel(name: String): String = {    val result = new StringBuilder    // 快速检查    if (name == null || name.isEmpty) { // 没必要转换      return ""      //        } else if (!name.contains("_")) {      //            // 不含下划线，仅将首字母小写      //            return name.substring(0, 1).toLowerCase() + name.substring(1);    }    // 用下划线将原始字符串分割    val camels = name.split("_")    for (camel <- camels) { // 跳过原始字符串中开头、结尾的下换线或双重下划线      // 处理真正的驼峰片段      if (result.length == 0) { // 第一个驼峰片段，全部字母都小写        result.append(camel.toLowerCase)      }      else { // 其他的驼峰片段，首字母大写        result.append(camel.substring(0, 1).toUpperCase)        result.append(camel.substring(1).toLowerCase)      }    }    result.toString  }

/**  * 从ResultSet取数  * @param md  * @param index  * @param rs  * @return  */def getData(md: ResultSetMetaData, index: Int, rs: ResultSet): String = {  md.getColumnType(index)  match {    case Types.DECIMAL => {      val value = rs.getBigDecimal(index)      val bigDecimal = value == null match {        case true => "0.0000"        case false => value.setScale(4, RoundingMode.HALF_UP).toString()      }      return bigDecimal    }    case Types.TIMESTAMP =>{      val value = rs.getTimestamp(index)      val timestamp = value == null match {        case true => ""        case false => DateTools.format(new Date(rs.getTimestamp(index).getTime))      }      return timestamp    }    case Types.DATE => {      val value = rs.getDate(index)      val date = value == null match {        case true => ""        case false => DateTools.format(rs.getDate(index), DateTools.DATE_PATTERN)      }      return date    }    case _ => {      val value = rs.getObject(index)      val data = value == null match {        case true => ""        case false => rs.getObject(index).toString      }      return data    }  }}

原文地址：https://www.cnblogs.com/barrywxx/p/9976507.html