List集合导出成Excel表格

需要的jar包:poi-3.14.jar

List集合导出成Excel表格
实体类

package job.util;

/**
 * 
 * @className Employee
 * @deprecated 导出的实体
 * @author pengfei.xiong
 * @date 2017年10月9日
 */
public class Employee {

    private String name;

      private String clazz;

      private Integer year;

      private Integer month;

      private Integer day;

      private double salary;

      public Employee() {
      };

      public Employee(String name, String clazz, Integer year, Integer month, Integer day,
          double salary) {
        super();
        this.name = name;
        this.clazz = clazz;
        this.year = year;
        this.month = month;
        this.day = day;
        this.salary = salary;
      }

      /**
       * @return name
       */
      public String getName() {
        return name;
      }

      /**
       * @return year
       */
      public Integer getYear() {
        return year;
      }

      /**
       * @return month
       */
      public Integer getMonth() {
        return month;
      }

      /**
       * @return day
       */
      public Integer getDay() {
        return day;
      }

      /**
       * @return salary
       */
      public double getSalary() {
        return salary;
      }

      /**
       * @param name
       *        set name
       */
      public void setName(String name) {
        this.name = name;
      }

      /**
       * @param year
       *        set year
       */
      public void setYear(Integer year) {
        this.year = year;
      }

      /**
       * @param month
       *        set month
       */
      public void setMonth(Integer month) {
        this.month = month;
      }

      /**
       * @param day
       *        set day
       */
      public void setDay(Integer day) {
        this.day = day;
      }

      /**
       * @param salary
       *        set salary
       */
      public void setSalary(double salary) {
        this.salary = salary;
      }

      /**
       * @return clazz
       */
      public String getClazz() {
        return clazz;
      }

      /**
       * @param clazz
       *        set clazz
       */
      public void setClazz(String clazz) {
        this.clazz = clazz;
      }

      @Override
      public String toString() {
        return "Employee [name=" + name + ", clazz=" + clazz + ", year=" + year + ", month=" + month
            + ", day=" + day + ", salary=" + salary + "]";
      }

}

工具类

package job.util;

import java.io.FileOutputStream;
import java.io.OutputStream;
import java.lang.reflect.Method;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.List;
import java.util.Map;
import java.util.UUID;

import org.apache.poi.hssf.usermodel.HSSFCell;
import org.apache.poi.hssf.usermodel.HSSFRow;
import org.apache.poi.hssf.usermodel.HSSFSheet;
import org.apache.poi.hssf.usermodel.HSSFWorkbook;
import org.apache.poi.ss.util.CellRangeAddress;
/**
 * 
 * @className ExportExcel
 * @deprecated List集合导出成Excel表格工具类
 * @author pengfei.xiong
 * @date 2017年10月9日
 */
public final class ExportExcel {
    /***
       * 构造方法
       */
      private ExportExcel() {

      }

      /***
       * 工作簿
       */
      private static HSSFWorkbook workbook;

      /***
       * sheet
       */
      private static HSSFSheet sheet;
     /***
       * 标题行开始位置
       */
      private static final int TITLE_START_POSITION = 0;

      /***
       * 时间行开始位置
       */
      private static final int DATEHEAD_START_POSITION = 1;

      /***
       * 表头行开始位置
       */
      private static final int HEAD_START_POSITION = 2;

      /***
       * 文本行开始位置
       */
      private static final int CONTENT_START_POSITION = 3;


      /**
       * 
       * @param dataList
       *        对象集合
       * @param titleMap
       *        表头信息（对象属性名称->要显示的标题值)[按顺序添加]
       * @param sheetName
       *        sheet名称和表头值
       */
      public static void excelExport(List<?> dataList, Map<String, String> titleMap, String sheetName) {
        // 初始化workbook
        initHSSFWorkbook(sheetName);
        // 标题行
        createTitleRow(titleMap, sheetName);
        // 时间行
        createDateHeadRow(titleMap);
        // 表头行
        createHeadRow(titleMap);
        // 文本行
        createContentRow(dataList, titleMap);
        //设置自动伸缩
        //autoSizeColumn(titleMap.size());
        // 写入处理结果
        try {
          //生成UUID文件名称
          //UUID是指在一台机器上生成的数字，它保证对在同一时空中的所有机器都是唯一的。
          UUID uuid = UUID.randomUUID();
          String filedisplay = uuid+".xls";
          //如果web项目，1、设置下载框的弹出（设置response相关参数)；2、通过httpservletresponse.getOutputStream()获取
          OutputStream out = new FileOutputStream("D:\" + filedisplay);
          workbook.write(out);
          out.close();
        }
        catch (Exception e) {
          e.printStackTrace();
        }
      }

      /***
       * 
       * @param sheetName
       *        sheetName
       */
      private static void initHSSFWorkbook(String sheetName) {
        workbook = new HSSFWorkbook();
        sheet = workbook.createSheet(sheetName);
      }

      /**
       * 生成标题（第零行创建）
       * @param titleMap 对象属性名称->表头显示名称
       * @param sheetName sheet名称
       */
      private static void createTitleRow(Map<String, String> titleMap, String sheetName) {
        CellRangeAddress titleRange = new CellRangeAddress(0, 0, 0, titleMap.size() - 1);
        sheet.addMergedRegion(titleRange);
        HSSFRow titleRow = sheet.createRow(TITLE_START_POSITION);
        HSSFCell titleCell = titleRow.createCell(0);
        titleCell.setCellValue(sheetName);
      }

      /**
       * 创建时间行（第一行创建）
       * @param titleMap 对象属性名称->表头显示名称
       */
      private static void createDateHeadRow(Map<String, String> titleMap) {
        CellRangeAddress dateRange = new CellRangeAddress(1, 1, 0, titleMap.size() - 1);
        sheet.addMergedRegion(dateRange);
        HSSFRow dateRow = sheet.createRow(DATEHEAD_START_POSITION);
        HSSFCell dateCell = dateRow.createCell(0);   
        dateCell.setCellValue(new SimpleDateFormat("yyyy年MM月dd日").format(new Date()));
      }

      /**
       * 创建表头行（第二行创建）
       * @param titleMap 对象属性名称->表头显示名称
       */
      private static void createHeadRow(Map<String, String> titleMap) {
        // 第1行创建
        HSSFRow headRow = sheet.createRow(HEAD_START_POSITION);
        int i = 0;
        for (String entry : titleMap.keySet()) {
          HSSFCell headCell = headRow.createCell(i);
          headCell.setCellValue(titleMap.get(entry));
          i++;
        }
      }

     /**
      * 
      * @param dataList 对象数据集合
      * @param titleMap 表头信息
      */
      private static void createContentRow(List<?> dataList, Map<String, String> titleMap) {
        try {
          int i=0;
          for (Object obj : dataList) {
            HSSFRow textRow = sheet.createRow(CONTENT_START_POSITION + i);
            int j = 0;
            for (String entry : titleMap.keySet()) {
              String method = "get" + entry.substring(0, 1).toUpperCase() + entry.substring(1);
              Method m = obj.getClass().getMethod(method, null);
              String value =   m.invoke(obj, null).toString();
              HSSFCell textcell = textRow.createCell(j);
              textcell.setCellValue(value);
              j++;
            }
            i++;
          }

        }
        catch (Exception e) {
          e.printStackTrace();
        }
      }
      /**
       * 自动伸缩列（如非必要，请勿打开此方法，耗内存）
       * @param size 列数
       */
      private static void autoSizeColumn(Integer size) { 
        for (int j = 0; j < size; j++) {
          sheet.autoSizeColumn(j);
        }
      }
}

测试类

package job.util;

import java.util.ArrayList;
import java.util.LinkedHashMap;
import java.util.List;
import java.util.Map;

public class Test {

    public static void main(String[] args) {
        /**模拟数据开始*/
        List<Employee> staffs = new ArrayList<Employee>();
        staffs.add(new Employee("test01", "一组", 2017, 9, 20, 20000));
        staffs.add(new Employee("test02", "一组", 2017, 9, 20, 20000));
        staffs.add(new Employee("test03", "一组", 2017, 9, 20, 20000));
        staffs.add(new Employee("test04", "一组", 2017, 9, 20, 20000));
        staffs.add(new Employee("test05", "一组", 2017, 9, 20, 20000));    

        Map<String,String> titleMap = new LinkedHashMap<String,String>();
        titleMap.put("name", "姓名");
        titleMap.put("clazz", "组号");
        titleMap.put("year", "年份");
        titleMap.put("month", "月份");
        titleMap.put("day", "天");
        titleMap.put("salary", "薪资");
        String sheetName = "信息导出";
        /**模拟数据结束*/

        System.out.println("start导出");
        long start = System.currentTimeMillis();
        ExportExcel.excelExport(staffs, titleMap, sheetName);
        long end = System.currentTimeMillis();
        System.out.println("end导出");
        System.out.println("耗时："+(end-start)+"ms");
      }
    }