java excel导出,
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java excel导出,
用的是 poi的包:
import java.io.IOException;
import java.io.OutputStream;
import java.lang.reflect.Method;
import java.text.SimpleDateFormat;
import java.util.Collection;
import java.util.Date;
import java.util.Iterator;
import java.util.Map;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
import javax.servlet.http.HttpServletResponse;
import org.apache.poi.hssf.usermodel.HSSFCell;
import org.apache.poi.hssf.usermodel.HSSFCellStyle;
import org.apache.poi.hssf.usermodel.HSSFClientAnchor;
import org.apache.poi.hssf.usermodel.HSSFFont;
import org.apache.poi.hssf.usermodel.HSSFPatriarch;
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;
/**
*
* @author yuki_ho
*
*/
public class ExportExcelUtil<T> {
/**
*
* @param response
* @param downName 下载名 含后续 xls
* 其他参数 看下面
*/
public void exportExcelCom(HttpServletResponse response,String downName ,String title, String[] headers,String[] Col,Collection<T> dataset, String pattern) throws IOException{
HSSFWorkbook workbook = this.exportExcel(title, headers, Col, dataset, pattern);
downName=downName+".xls";
response.setContentType("application/vnd.ms-excel");
response.setHeader("Content-disposition", "attachment;filename=" + new String(downName.getBytes("gb2312"), "iso8859-1")) ;
OutputStream ouputStream = response.getOutputStream();
workbook.write(ouputStream);
ouputStream.flush();
ouputStream.close();
}
/**
*
* @param title
* 表格标题名
* @param headers
* 表格属性列名数组 (第一行标题)
* @param Col
* 需要显示的表格属性列名数组 如果是javabean 必须和字段名字一直 如果为Map 必须为Map的key名字对应
* @param dataset
* 需要显示的数据集合,集合泛型支持两种,1:符合javabean风格的类的对象 2:Map类型。此方法支持的
* javabean属性的数据类型有基本数据类型及String,Date,byte[](图片数据)
* @param pattern
* 如果有时间数据,设定输出格式。默认为"yyy-MM-dd"
*/
public HSSFWorkbook exportExcel(String title, String[] headers,String[] Col,Collection<T> dataset, String pattern) {
if(pattern == null || pattern.equals("")) pattern = "yyy-MM-dd";
// 声明一个工作薄
HSSFWorkbook workbook = new HSSFWorkbook();
// 生成一个表格
HSSFSheet sheet = workbook.createSheet(title);
// 设置表格默认列宽度为15个字节
sheet.setDefaultColumnWidth(15);
// 生成一个样式
HSSFCellStyle style = workbook.createCellStyle();
// 设置这些样式
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);
// 生成一个字体
HSSFFont 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);
// 生成并设置另一个样式
HSSFCellStyle style2 = workbook.createCellStyle();
style2.setFillForegroundColor(HSSFColor.WHITE.index);
style2.setFillPattern(HSSFCellStyle.SOLID_FOREGROUND);
style2.setBorderBottom(HSSFCellStyle.BORDER_THIN);
style2.setBorderLeft(HSSFCellStyle.BORDER_THIN);
style2.setBorderRight(HSSFCellStyle.BORDER_THIN);
style2.setBorderTop(HSSFCellStyle.BORDER_THIN);
style2.setAlignment(HSSFCellStyle.ALIGN_CENTER);
style2.setVerticalAlignment(HSSFCellStyle.VERTICAL_CENTER);
// 生成另一个字体
HSSFFont font2 = workbook.createFont();
font2.setBoldweight(HSSFFont.BOLDWEIGHT_NORMAL);
// 把字体应用到当前的样式
style2.setFont(font2);
// 声明一个画图的顶级管理器
HSSFPatriarch patriarch = sheet.createDrawingPatriarch();
// 产生表格标题行
HSSFRow row = sheet.createRow(0);
int Cell = 0;
for (short i = 0; i < headers.length; i++) {
HSSFCell cell = row.createCell(Cell);
cell.setCellStyle(style);
HSSFRichTextString text = new HSSFRichTextString(headers[i]);
cell.setCellValue(text);
Cell ++ ;
}
// 遍历集合数据,产生数据行
Iterator<T> it = dataset.iterator();
int index = 0;
while (it.hasNext()) {
index++;
row = sheet.createRow(index);
T t = (T) it.next();
String[] fields = Col;
Cell = 0;
for (short i = 0; i < fields.length; i++) {
String fieldName = fields[i];
HSSFCell cell = row.createCell(Cell);
cell.setCellStyle(style2);
try {
Object value = "";
Class tCls = null;
Map map = null;
if(t instanceof Map){
map = (Map)t;
value = map.get(fieldName);
} else {
String getMethodName = "get"
+ fieldName.substring(0, 1).toUpperCase()
+ fieldName.substring(1);
tCls = t.getClass();
Method getMethod = tCls.getMethod(getMethodName,new Class[] {});
value = getMethod.invoke(t, new Object[] {});
}
if(value == null ) value = "";
// 判断值的类型后进行强制类型转换
String textValue = null;
if (value instanceof Date) {
Date date = (Date) value;
SimpleDateFormat sdf = new SimpleDateFormat(pattern);
textValue = sdf.format(date);
} else if (value instanceof byte[]) {
// 有图片时,设置行高为60px;
row.setHeightInPoints(60);
// 设置图片所在列宽度为80px,注意这里单位的一个换算
sheet.setColumnWidth(Cell, (short) (35.7 * 80));
// sheet.autoSizeColumn(i);
byte[] bsValue = (byte[]) value;
HSSFClientAnchor anchor = new HSSFClientAnchor(0, 0,
1023, 255, (short) 6, index, (short) 6, index);
anchor.setAnchorType(2);
patriarch.createPicture(anchor, workbook.addPicture(
bsValue, HSSFWorkbook.PICTURE_TYPE_JPEG));
} else {
// 其它数据类型都当作字符串简单处理
textValue = value.toString();
}
// 如果不是图片数据,就利用正则表达式判断textValue是否全部由数字组成
if (textValue != null) {
Pattern p = Pattern.compile("^//d+(//.//d+)?$");
Matcher matcher = p.matcher(textValue);
if (matcher.matches()) {
// 是数字当作double处理
cell.setCellValue(Double.parseDouble(textValue));
} else {
HSSFRichTextString richString = new HSSFRichTextString(
textValue);
HSSFFont font3 = workbook.createFont();
font3.setColor(HSSFColor.BLUE.index);
richString.applyFont(font3);
cell.setCellValue(richString);
}
}
Cell ++ ;
} catch (Exception e) {
e.printStackTrace();
}
}
}
return workbook;
}
}
使用例子:(ps: headers 和 Col 可以进一步 优化 ,化简成一个 linklist 作为参数 )
String[] headers = { "发现问题内容","处理状态","问题类别","缺陷跟踪情况","发现人员","发现时间"};
String[] Col = {"title","promblemSateName","typeName","problemDeal","findPersonName","findDate"};
ExportExcelUtil<Map<String,Object>> excelUtil=new ExportExcelUtil<Map<String,Object>>();
String title=new SimpleDateFormat("yyyyMMddhhmmss").format(new Date()).toString();
excelUtil.exportExcelCom(response, "问题库", title, headers, Col, results, null);
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