Java XSSF 導出excel 工具類

參數解釋： title：導出excel標題、headers 導出到excel顯示的列頭、
　　　　　　columns 對應數據庫字段 、list 導出數據
1、pox中添加依賴 

<dependency>
<groupId>org.apache.poi</groupId>
<artifactId>poi-ooxml</artifactId>
<version>3.15-beta2</version>
</dependency>
<!-- https://mvnrepository.com/artifact/org.apache.poi/poi-ooxml-schemas -->
<dependency>
<groupId>org.apache.poi</groupId>
<artifactId>poi-ooxml-schemas</artifactId>
<version>3.17</version>
</dependency>

2、添加工具類
public void expoortExcelx(String title, String[] headers, String[] columns,
            List<T> list, OutputStream out, String pattern) throws NoSuchMethodException, Exception{
            //創建工作薄
            XSSFWorkbook workbook=new XSSFWorkbook();
            //創建表格
            Sheet sheet=workbook.createSheet(title);
            //設置默認寬度
            sheet.setDefaultColumnWidth(25);
            //創建樣式
            XSSFCellStyle style=workbook.createCellStyle();
            //設置樣式
            style.setFillForegroundColor(IndexedColors.GOLD.index);
            style.setFillPattern(CellStyle.SOLID_FOREGROUND);
            style.setBorderBottom(CellStyle.BORDER_THIN);
            style.setBorderLeft(CellStyle.BORDER_THIN);
            style.setBorderRight(CellStyle.BORDER_THIN);
            style.setBorderTop(CellStyle.BORDER_THIN);
            //生成字體
            XSSFFont font=workbook.createFont();
            font.setColor(IndexedColors.VIOLET.index);
            font.setBoldweight(XSSFFont.BOLDWEIGHT_BOLD);
            //應用字體
            style.setFont(font);
            
            //自動換行
            style.setWrapText(true);
            //聲明一個畫圖的頂級管理器
            Drawing drawing=(XSSFDrawing) sheet.createDrawingPatriarch();
            //表頭的樣式
            XSSFCellStyle titleStyle=workbook.createCellStyle();//樣式對象
            titleStyle.setAlignment(CellStyle.ALIGN_CENTER_SELECTION);//水平居中
            titleStyle.setVerticalAlignment(CellStyle.VERTICAL_CENTER);
            //設置字體
            XSSFFont titleFont=workbook.createFont();
            titleFont.setFontHeightInPoints((short)15);
            titleFont.setBoldweight(XSSFFont.BOLDWEIGHT_BOLD);//粗體
            titleStyle.setFont(titleFont);
            sheet.addMergedRegion(new CellRangeAddress(0, 0, 0, headers.length-1));
            //指定合並區域
            Row rowHeader = sheet.createRow(0);
            //XSSFRow rowHeader=sheet.createRow(0);
            Cell cellHeader=rowHeader.createCell(0);
            XSSFRichTextString textHeader=new XSSFRichTextString(title);
            cellHeader.setCellStyle(titleStyle);
            cellHeader.setCellValue(textHeader);
    
            Row row=sheet.createRow(1);
            for(int i=0;i<headers.length;i++){
                Cell cell=row.createCell(i);
                cell.setCellStyle(style);
                XSSFRichTextString text=new XSSFRichTextString(headers[i]);
                cell.setCellValue(text);
            }
            //遍歷集合數據，產生數據行
            if(list!=null&&list.size()>0){
                int index=2;
                for(T t:list){
                    row=sheet.createRow(index);
                    index++;
                    for(short i=0;i<columns.length;i++){
                        Cell cell=row.createCell(i);
                        String filedName=columns[i];
                        String getMethodName="get"+filedName.substring(0,1).toUpperCase()
                                +filedName.substring(1);
                        Class tCls=t.getClass();
                        Method getMethod=tCls.getMethod(getMethodName,new Class[]{});
                        Object value=getMethod.invoke(t, new Class[]{});
                        String textValue=null;
                        if(value==null){
                            textValue="";
                        }else if(value instanceof Date){
                            Date date=(Date)value;
                            SimpleDateFormat sdf = new SimpleDateFormat(pattern);
                            textValue = sdf.format(date);
                        }else if(value instanceof byte[]){
                            row.setHeightInPoints(80);
                            sheet.setColumnWidth(i, 35*100);
                            byte[] bsValue=(byte[])value;
                            XSSFClientAnchor anchor=new XSSFClientAnchor(0,0,1023,255,6,index,6,index);
                            anchor.setAnchorType(2);
                            drawing.createPicture(anchor, workbook.addPicture(bsValue, XSSFWorkbook.PICTURE_TYPE_JPEG));
                        }else{
                            // 其它數據類型都當作字符串簡單處理
                            textValue=value.toString();
                        }
                        
                        if(textValue!=null){
                            Pattern p = Pattern.compile("^//d+(//.//d+)?$");
                            Matcher matcher = p.matcher(textValue);
                            if (matcher.matches()) {
                                // 是數字當作double處理
                                cell.setCellValue(Double.parseDouble(textValue));
                            } else {
                                XSSFRichTextString richString = new XSSFRichTextString(
                                        textValue);
                                // HSSFFont font3 = workbook.createFont();
                                // font3.setColor(HSSFColor.BLUE.index);
                                // richString.applyFont(font3);
                                cell.setCellValue(richString);
                            }
                        }
                        
                    }
                }
            }
            workbook.write(out);        
    }
3、
response.setHeader("Content-Disposition", "attachment; filename="+DateUtil.DateToString()+".xlsx");

  OutputStream out =response.getOutputStream();
  ExportExcelUtil.expoortExcelx("表頭",headers,clouns,list,out,"yyyy-MM-dd HH:mm:ss");