使用java程序生成excel文档程序

package com.itheima.utils;

import java.beans.PropertyDescriptor;
import java.io.IOException;
import java.io.OutputStream;
import java.text.SimpleDateFormat;
import java.util.Collection;
import java.util.Date;

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.HSSFWorkbook;
import org.apache.poi.hssf.util.HSSFColor;
import org.apache.poi.ss.usermodel.Cell;
import org.apache.poi.ss.usermodel.CellStyle;
import org.apache.poi.ss.usermodel.Font;
import org.apache.poi.ss.usermodel.Row;
import org.apache.poi.ss.usermodel.Sheet;
import org.apache.poi.ss.usermodel.Workbook;

public class ExportExcelUtils {

/**
* @param title：excel文件名称
* @param headers：表头
* @param dataset：要保存到表格的对象集合
* @param attrList：对象要保存的属性
* @param out：输出目的地
*/
public static void exportExcel(String title, String[] headers, Collection dataset,String attrList[], OutputStream out) {

// 声明一个工作薄
Workbook workbook = new HSSFWorkbook();

// 生成一个表格
Sheet sheet = workbook.createSheet(title);

// 设置表格默认列宽度为15
sheet.setDefaultColumnWidth((short) 15);

// 产生表头
Row row = sheet.createRow(0);

//插入表头数据
for (short i = 0; i < headers.length; i++) {
Cell cell = row.createCell(i);
//设置样式
cell.setCellStyle(createHeaderStyle(workbook));
HSSFRichTextString text = new HSSFRichTextString(headers[i]);
cell.setCellValue(text);
}

int index = 1;
for(Object bean : dataset){
//得到一个bean，则生成表格的一行
row = sheet.createRow(index++);
for(int i=0;i<attrList.length;i++){
PropertyDescriptor pd = null;
try{
pd = new PropertyDescriptor(attrList[i],bean.getClass());
}catch (Exception e) {
throw new RuntimeException("bean中没有属性：" + attrList[i]);
}

//得到bean的属性值
Object attrValue = null;
try {
attrValue = pd.getReadMethod().invoke(bean, null);
} catch (Exception e) {
throw new RuntimeException("无法获取bean的属性值：" + pd.getName());
}

//转成字符串
String cellValue = "";
if(attrValue instanceof Date){
SimpleDateFormat df = new SimpleDateFormat("yyyy-MM-dd");
df.format(attrValue);
}else{
if(attrValue!=null){
cellValue = attrValue.toString();
}
}

Cell cell = row.createCell(i);
cell.setCellStyle(createDataStyle(workbook));
cell.setCellValue(cellValue);
}
}
try {
workbook.write(out);
} catch (IOException e) {
throw new RuntimeException(e);
}
}

private static CellStyle createHeaderStyle(Workbook workbook){
// 生成一个样式
CellStyle style = workbook.createCellStyle();

// 设置表头的样式
style.setFillForegroundColor(HSSFColor.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);

// 生成表头的字体
Font font = workbook.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);
return style;
}

private static CellStyle createDataStyle(Workbook workbook){

// 生成数据行的样式
CellStyle style = workbook.createCellStyle();
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);
style.setVerticalAlignment(HSSFCellStyle.VERTICAL_CENTER);
// 生成数据行的字体
Font font = workbook.createFont();
font.setBoldweight(HSSFFont.BOLDWEIGHT_NORMAL);
// 把字体应用到当前的样式
style.setFont(font);
return style;
}

}