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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