数据库导出到excel

时间：2023-03-09 09:56:52
数据库导出到excel

项目结构同上一篇

泛型通用的写法

ExportExcel.java

package excel;

import java.io.OutputStream;

import java.lang.reflect.Field;

import java.lang.reflect.Method;

import java.text.SimpleDateFormat;

import java.util.Date;

import java.util.List;

import org.apache.poi.hssf.usermodel.HSSFCell;

import org.apache.poi.hssf.usermodel.HSSFCellStyle;

import org.apache.poi.hssf.usermodel.HSSFFont;

import org.apache.poi.hssf.usermodel.HSSFRichTextString;

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.hssf.util.HSSFColor;

public class ExportExcel<T> {

    public void exportExcel(String title, String[] headers, List<T> list, OutputStream out){

        //声明一个工作薄

        HSSFWorkbook hssfWorkbook = new HSSFWorkbook();

        //生成一个表格

        HSSFSheet sheet = hssfWorkbook.createSheet(title);

        //设置表格默认列宽度

        sheet.setDefaultColumnWidth(15);

        //生成一个样式

        HSSFCellStyle style = hssfWorkbook.createCellStyle();

        //设置样式

        style.setFillForegroundColor(HSSFColor.SKY_BLUE.index);

        style.setFillPattern(HSSFCellStyle.SOLID_FOREGROUND);

        style.setBorderBottom(HSSFCellStyle.BORDER_THIN);

        style.setBorderLeft(HSSFCellStyle.BORDER_THIN);

        style.setBorderRight(HSSFCellStyle.BORDER_THIN);

        style.setBorderTop(HSSFCellStyle.BORDER_THIN);

        style.setAlignment(HSSFCellStyle.ALIGN_CENTER);

        //生成字体

        HSSFFont font = hssfWorkbook.createFont();

        font.setColor(HSSFColor.VIOLET.index);

        font.setFontHeightInPoints((short) 12);

        font.setBoldweight(HSSFFont.BOLDWEIGHT_BOLD);

        // 把字体应用到当前的样式

        style.setFont(font);

        //产生表格标题行

        HSSFRow row = sheet.createRow(0);

        for(int i = 0; i < headers.length; i++){

            HSSFCell cell = row.createCell(i);

            cell.setCellStyle(style);

            HSSFRichTextString text = new HSSFRichTextString(headers[i]);

            cell.setCellValue(text);

        }

        int index = 0;

        for(T t: list){

            index++;

            row = sheet.createRow(index);

            Field[] fields = t.getClass().getDeclaredFields();

            for(int i = 0; i < fields.length; i++){

                HSSFCell cell = row.createCell(i);

                cell.setCellStyle(style);

                Field field = fields[i];

                String fieldName = field.getName();

                String getMethodName = "get"

                        + fieldName.substring(0, 1).toUpperCase()

                        + fieldName.substring(1);

                try{

                    Class tCls = t.getClass();

                    Method getMethod = tCls.getMethod(getMethodName,

                            new Class[] {});

                    Object value = getMethod.invoke(t, new Object[] {});

                    String textValue = value.toString();

                    HSSFRichTextString richString = new HSSFRichTextString(textValue);

                    HSSFFont font3 = hssfWorkbook.createFont();

                    font3.setColor(HSSFColor.BLUE.index);

                    richString.applyFont(font3);

                    cell.setCellValue(richString);

                }catch (Exception e) {

                    e.printStackTrace();

                }

            }

        }

        try{

            hssfWorkbook.write(out);

        }catch (Exception e) {

            // TODO: handle exception

            e.printStackTrace();

        }

    }

    public void exportExcels(List<T> list, OutputStream out){

        //声明一个工作薄

        HSSFWorkbook hssfWorkbook = new HSSFWorkbook();

        //生成一个表格

        HSSFSheet sheet = hssfWorkbook.createSheet();

        //设置表格默认列宽度

        sheet.setDefaultColumnWidth(20);

        //生成一个样式

        HSSFCellStyle style = hssfWorkbook.createCellStyle();

        //设置样式

        style.setFillForegroundColor(HSSFColor.SKY_BLUE.index);

        style.setFillPattern(HSSFCellStyle.SOLID_FOREGROUND);

        style.setBorderBottom(HSSFCellStyle.BORDER_THIN);

        style.setBorderLeft(HSSFCellStyle.BORDER_THIN);

        style.setBorderRight(HSSFCellStyle.BORDER_THIN);

        style.setBorderTop(HSSFCellStyle.BORDER_THIN);

        style.setAlignment(HSSFCellStyle.ALIGN_CENTER);

        //生成字体

        HSSFFont font = hssfWorkbook.createFont();

        font.setColor(HSSFColor.VIOLET.index);

        font.setFontHeightInPoints((short) 12);

        font.setBoldweight(HSSFFont.BOLDWEIGHT_BOLD);

        // 把字体应用到当前的样式

        style.setFont(font);

        //产生表格标题行

        HSSFRow row = sheet.createRow(0);

        T x = list.get(0);

        for(int i = 0; i < x.getClass().getDeclaredFields().length; i++){

            HSSFCell cell = row.createCell(i);

            cell.setCellStyle(style);

            HSSFRichTextString text = new HSSFRichTextString(x.getClass().getDeclaredFields()[i].getName());

            cell.setCellValue(text);

        }

        int index = 0;

        for(T t: list){

            index++;

            row = sheet.createRow(index);

            Field[] fields = t.getClass().getDeclaredFields();

            for(int i = 0; i < fields.length; i++){

                HSSFCell cell = row.createCell(i);

                cell.setCellStyle(style);

                Field field = fields[i];

                String fieldName = field.getName();

                String getMethodName = "get"

                        + fieldName.substring(0, 1).toUpperCase()

                        + fieldName.substring(1);

                try{

                    Class tCls = t.getClass();

                    Method getMethod = tCls.getMethod(getMethodName,

                            new Class[] {});

                    Object value = getMethod.invoke(t, new Object[] {});

                    String textValue;

                    if(value == null){

                        continue;

                    }

                    if(value instanceof Date){

                        Date date = (Date) value;

                        SimpleDateFormat sdf = new SimpleDateFormat("yyy-MM-dd");

                        textValue = sdf.format(date);

                    }else{

                        textValue = value.toString();

                    }

                    HSSFRichTextString richString = new HSSFRichTextString(textValue);

                    HSSFFont font3 = hssfWorkbook.createFont();

                    font3.setColor(HSSFColor.BLUE.index);

                    richString.applyFont(font3);

                    cell.setCellValue(richString);

                }catch (Exception e) {

//                    e.printStackTrace();

                }

            }

        }

        try{

            hssfWorkbook.write(out);

        }catch (Exception e) {

            // TODO: handle exception

            e.printStackTrace();

        }

    }

}

非泛型硬编码的写法：

package client;

import java.io.FileOutputStream;

import java.io.IOException;

import java.io.OutputStream;

import java.lang.reflect.Field;

import java.lang.reflect.Method;

import java.text.SimpleDateFormat;

import java.util.ArrayList;

import java.util.Date;

import java.util.List;

import mysql.mapper.StudentMapper;

import org.apache.poi.hssf.usermodel.HSSFCell;

import org.apache.poi.hssf.usermodel.HSSFCellStyle;

import org.apache.poi.hssf.usermodel.HSSFFont;

import org.apache.poi.hssf.usermodel.HSSFRichTextString;

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.hssf.util.HSSFColor;

import org.springframework.context.ApplicationContext;

import org.springframework.context.support.ClassPathXmlApplicationContext;

import station.mapper.StationApplyMapper;

import excel.ExportExcel;

import Student.StationApply;

import Student.StationApplyExample;

import Student.Student;

import Student.StudentExample;

public class PoiDemo {

    public static void main(String[] args) throws IOException{

        long t1 = System.currentTimeMillis();

        ApplicationContext ctx = new ClassPathXmlApplicationContext("applicationContext-dao.xml");

        StationApplyMapper stationApplyMapper = (StationApplyMapper) ctx.getBean("stationApplyMapper");

        StationApplyExample stationApplyExample = new StationApplyExample();

        List<StationApply> list = stationApplyMapper.selectByExample(stationApplyExample);

        OutputStream out = new FileOutputStream("D://a.xls");

//        new ExportExcel<Student>().exportExcel("test", headers, list, out);

//        new ExportExcel<StationApply>().exportExcels(list, out);

        exportExcels(list, out);

        out.close();

        System.out.println("success!");

        long t2 = System.currentTimeMillis();

        System.out.println(t2 - t1);

    }

    public static  void exportExcels(List<StationApply> list, OutputStream out){

        //声明一个工作薄

        HSSFWorkbook hssfWorkbook = new HSSFWorkbook();

        //生成一个表格

        HSSFSheet sheet = hssfWorkbook.createSheet();

        //设置表格默认列宽度

        sheet.setDefaultColumnWidth(20);

        //生成一个样式

        HSSFCellStyle style = hssfWorkbook.createCellStyle();

        //设置样式

        style.setFillForegroundColor(HSSFColor.SKY_BLUE.index);

        style.setFillPattern(HSSFCellStyle.SOLID_FOREGROUND);

        style.setBorderBottom(HSSFCellStyle.BORDER_THIN);

        style.setBorderLeft(HSSFCellStyle.BORDER_THIN);

        style.setBorderRight(HSSFCellStyle.BORDER_THIN);

        style.setBorderTop(HSSFCellStyle.BORDER_THIN);

        style.setAlignment(HSSFCellStyle.ALIGN_CENTER);

        //生成字体

        HSSFFont font = hssfWorkbook.createFont();

        font.setColor(HSSFColor.VIOLET.index);

        font.setFontHeightInPoints((short) 12);

        font.setBoldweight(HSSFFont.BOLDWEIGHT_BOLD);

        // 把字体应用到当前的样式

        style.setFont(font);

        //产生表格标题行

        HSSFRow row = sheet.createRow(0);

        StationApply x = list.get(0);

        for(int i = 0; i < x.getClass().getDeclaredFields().length; i++){

            HSSFCell cell = row.createCell(i);

            cell.setCellStyle(style);

            HSSFRichTextString text = new HSSFRichTextString(x.getClass().getDeclaredFields()[i].getName());

            cell.setCellValue(text);

        }

        int index = 0;

        for(StationApply t: list){

            if(t == null){

                continue;

            }

            index++;

            row = sheet.createRow(index);

            HSSFCell cell = row.createCell(0);

//            SimpleDateFormat sdf = new SimpleDateFormat("yyy-MM-dd");

            try{

                HSSFRichTextString richString = new HSSFRichTextString(String.valueOf(t.getId()));

                cell.setCellValue(richString);

                cell = row.createCell(1);

                richString = new HSSFRichTextString(String.valueOf(t.getGmtCreate()));

                cell.setCellValue(richString);

                cell = row.createCell(2);

                richString = new HSSFRichTextString(String.valueOf(t.getGmtModified()));

                cell.setCellValue(richString);

                cell = row.createCell(3);

                richString = new HSSFRichTextString(t.getCreator());

                cell.setCellValue(richString);

                cell = row.createCell(4);

                richString = new HSSFRichTextString(t.getModifier());

                cell.setCellValue(richString);

                cell = row.createCell(5);

                richString = new HSSFRichTextString(t.getIsDeleted());

                cell.setCellValue(richString);

                cell = row.createCell(6);

                richString = new HSSFRichTextString(t.getIsDeleted());

                cell.setCellValue(richString);

                cell = row.createCell(7);

                richString = new HSSFRichTextString(t.getName());

                cell.setCellValue(richString);

                cell = row.createCell(8);

                richString = new HSSFRichTextString(t.getState());

                cell.setCellValue(richString);

                cell = row.createCell(9);

                richString = new HSSFRichTextString(t.getApplierName());

                cell.setCellValue(richString);

                cell = row.createCell(10);

                richString = new HSSFRichTextString(t.getIdenNum());

                cell.setCellValue(richString);

                cell = row.createCell(11);

                richString = new HSSFRichTextString(t.getMobile());

                cell.setCellValue(richString);

                cell = row.createCell(12);

                richString = new HSSFRichTextString(t.getCovered());

                cell.setCellValue(richString);

                cell = row.createCell(13);

                richString = new HSSFRichTextString(t.getProducts());

                cell.setCellValue(richString);

                cell = row.createCell(14);

                richString = new HSSFRichTextString(t.getLogisticsState());

                cell.setCellValue(richString);

                cell = row.createCell(15);

                richString = new HSSFRichTextString(t.getDescription());

                cell.setCellValue(richString);

                cell = row.createCell(16);

                richString = new HSSFRichTextString(t.getFormat());

                cell.setCellValue(richString);

                cell = row.createCell(17);

                richString = new HSSFRichTextString(t.getAlipayAccount());

                cell.setCellValue(richString);

                cell = row.createCell(18);

                richString = new HSSFRichTextString(t.getTaobaoNick());

                cell.setCellValue(richString);

                cell = row.createCell(19);

                richString = new HSSFRichTextString(String.valueOf(t.getStationId()));

                cell.setCellValue(richString);

                cell = row.createCell(20);

                richString = new HSSFRichTextString(String.valueOf(t.getOwnOrgId()));

                cell.setCellValue(richString);

                }catch (Exception e) {

                    e.printStackTrace();

                }

            }

        try{

            hssfWorkbook.write(out);

        }catch (Exception e) {

            // TODO: handle exception

            e.printStackTrace();

        }

}

}

测试耗时2s左右 测试数据10000条记录 每条记录20个字段

web实例http://www.cnblogs.com/xwdreamer/archive/2011/07/20/2296975.html

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