技術匯總:第一章:使用poi實現(xiàn)表單下載成xls文件并打印
業(yè)務需求:
點擊下載
第一種方式:
實現(xiàn)代碼
@RequestMapping("/ad/downExcel")
public String downExcel(HttpSession session, HttpServletResponse response) {
try {
List<Ad> adlist = adService.getAdList();
String fileName="廣告管理表";
List<Map<String,Object>> list=createExcelRecord(adlist);
String columnNames[]={"標題","鏈接","權重"};//列名
String keys[] = {"title","link","weight"};//map中的key
ByteArrayOutputStream os = new ByteArrayOutputStream();
try {
ExcelUtil.createWorkBook(list,keys,columnNames).write(os);
} catch (IOException e) {
e.printStackTrace();
}
byte[] content = os.toByteArray();
InputStream is = new ByteArrayInputStream(content);
// 設置response參數(shù),可以打開下載頁面
response.reset();
response.setContentType("application/vnd.ms-excel;charset=utf-8");
response.setHeader("Content-Disposition",
"attachment;filename="+ new String((fileName + ".xls").getBytes(),
"iso-8859-1"));
ServletOutputStream out = response.getOutputStream();
BufferedInputStream bis = null;
BufferedOutputStream bos = null;
try {
bis = new BufferedInputStream(is);
bos = new BufferedOutputStream(out);
byte[] buff = new byte[2048];
int bytesRead;
// Simple read/write loop.
while (-1 != (bytesRead = bis.read(buff, 0, buff.length))) {
bos.write(buff, 0, bytesRead);
}
} catch (final IOException e) {
throw e;
} finally {
if (bis != null)
bis.close();
if (bos != null)
bos.close();
}
}catch (Exception e){
}
return null;
}
private List<Map<String, Object>> createExcelRecord(List<Ad> adList) {
List<Map<String, Object>> listmap = new ArrayList<Map<String, Object>>();
Map<String, Object> map = new HashMap<String, Object>();
map.put("sheetName", "sheet1");
listmap.add(map);
Map<String, Object> mapValue = null;
for (int j = 0; j < adList.size(); j++) {
Ad ad=adList.get(j);
mapValue = new HashMap<String, Object>();
mapValue.put("title", ad.getTitle());
mapValue.put("link",ad.getLink());
mapValue.put("weight",ad.getWeight());
listmap.add(mapValue);
}
return listmap;
}
工具類
package org.imooc.util;
import org.apache.poi.hssf.usermodel.HSSFWorkbook;
import org.apache.poi.ss.usermodel.*;
import java.util.List;
import java.util.Map;
public class ExcelUtil {
/**
* 創(chuàng)建excel文檔,
* list 數(shù)據(jù)
* @param keys list中map的key數(shù)組集合
* @param columnNames excel的列名
* */
public static Workbook createWorkBook(List<Map<String, Object>> list, String []keys, String columnNames[]) {
// 創(chuàng)建excel工作簿
Workbook wb = new HSSFWorkbook();
// 創(chuàng)建第一個sheet(頁),并命名
Sheet sheet = wb.createSheet(list.get(0).get("sheetName").toString());
// 手動設置列寬。第一個參數(shù)表示要為第幾列設;,第二個參數(shù)表示列的寬度,n為列高的像素數(shù)。
for(int i=0;i<keys.length;i++){
sheet.setColumnWidth((short) i, (short) (35.7 * 200));
}
// 創(chuàng)建第一行
Row row = sheet.createRow((short) 0);
// 創(chuàng)建兩種單元格格式
CellStyle cs = wb.createCellStyle();
CellStyle cs2 = wb.createCellStyle();
// 創(chuàng)建兩種字體
Font f = wb.createFont();
Font f2 = wb.createFont();
// 創(chuàng)建第一種字體樣式(用于列名)
f.setFontHeightInPoints((short) 10);
f.setColor(IndexedColors.BLACK.getIndex());
f.setBoldweight(Font.BOLDWEIGHT_BOLD);
// 創(chuàng)建第二種字體樣式(用于值)
f2.setFontHeightInPoints((short) 10);
f2.setColor(IndexedColors.BLACK.getIndex());
// Font f3=wb.createFont();
// f3.setFontHeightInPoints((short) 10);
// f3.setColor(IndexedColors.RED.getIndex());
// 設置第一種單元格的樣式(用于列名)
cs.setFont(f);
cs.setBorderLeft(CellStyle.BORDER_THIN);
cs.setBorderRight(CellStyle.BORDER_THIN);
cs.setBorderTop(CellStyle.BORDER_THIN);
cs.setBorderBottom(CellStyle.BORDER_THIN);
cs.setAlignment(CellStyle.ALIGN_CENTER);
// 設置第二種單元格的樣式(用于值)
cs2.setFont(f2);
cs2.setBorderLeft(CellStyle.BORDER_THIN);
cs2.setBorderRight(CellStyle.BORDER_THIN);
cs2.setBorderTop(CellStyle.BORDER_THIN);
cs2.setBorderBottom(CellStyle.BORDER_THIN);
cs2.setAlignment(CellStyle.ALIGN_CENTER);
//設置列名
for(int i=0;i<columnNames.length;i++){
Cell cell = row.createCell(i);
cell.setCellValue(columnNames[i]);
cell.setCellStyle(cs);
}
//設置每行每列的值
for (short i = 1; i < list.size(); i++) {
// Row 行,Cell 方格 , Row 和 Cell 都是從0開始計數(shù)的
// 創(chuàng)建一行,在頁sheet上
Row row1 = sheet.createRow((short) i);
// 在row行上創(chuàng)建一個方格
for(short j=0;j<keys.length;j++){
Cell cell = row1.createCell(j);
cell.setCellValue(list.get(i).get(keys[j]) == null?" ": list.get(i).get(keys[j]).toString());
cell.setCellStyle(cs2);
}
}
return wb;
}
}
第二種方式:
先準備好一個空的名稱為new的xls文件(名稱和代碼一致)
核心代碼:
@RequestMapping("downExcel")
public void download() throws IOException{
List<Ad> adList = adService.getAdList();
String filePath = "D:\\new.xls";
File file = new File(filePath);
//事先要準備好一個名稱為new的xls文件
InputStream is=new FileInputStream(file);
Workbook wb=new HSSFWorkbook(is);
Sheet sheet = wb.getSheetAt(0);
Row nRow=null;
Cell nCell=null;
//行號
int rowNo=0;
// 列號
int colNo=1;
//聲明樣式對象和字體對象
CellStyle nStyle=wb.createCellStyle();
Font font = wb.createFont();
sheet.setColumnWidth(0,2*300);
sheet.setColumnWidth(1,26*300);
sheet.setColumnWidth(2,12*300);
//大標題,合并單元格
sheet.addMergedRegion(new CellRangeAddress(0,0,1,3)); //開始行,結束行,開始列,結束列
// 合并單元格的內容寫在合并前第一個單元格中
nRow=sheet.createRow(rowNo++);
nRow.setHeightInPoints(36);
nCell=nRow.createCell(1);
nCell.setCellValue("標題");
nCell.setCellStyle(this.bigTitle(wb, nStyle, font));
String[] title=new String[]{"id","標題","權重"};
nRow=sheet.createRow(rowNo++);
nRow.setHeightInPoints(26.25f);
//初始化
nStyle=wb.createCellStyle();
font=wb.createFont();
for(int i=0;i<title.length;i++){
nCell=nRow.createCell(i+1);
nCell.setCellValue(title[i]);
nCell.setCellStyle(this.Title(wb, nStyle, font));
}
//初始化
nStyle=wb.createCellStyle();
font=wb.createFont();
for (int i = 0; i < adList.size(); i++) {
Ad ad = adList.get(i);
colNo=1;
nRow=sheet.createRow(rowNo++);
nCell=nRow.createCell(colNo++);
nCell.setCellValue(ad.getId());
nCell.setCellStyle(this.Text(wb, nStyle, font));
nCell=nRow.createCell(colNo++);
nCell.setCellValue(ad.getTitle());
nCell.setCellStyle(this.Text(wb, nStyle, font));
nCell=nRow.createCell(colNo++);
nCell.setCellValue(ad.getWeight());
nCell.setCellStyle(this.Text(wb, nStyle, font));
}
OutputStream os=new FileOutputStream(file);
wb.write(os);
os.flush();
os.close();
}
各種樣式代碼
//大標題的樣式
public CellStyle bigTitle(Workbook wb,CellStyle nStyle,Font font){
font.setFontName("宋體");
font.setFontHeightInPoints((short) 16);
//字體加粗
font.setBoldweight(HSSFFont.BOLDWEIGHT_BOLD);
//橫向居中
nStyle.setAlignment(CellStyle.ALIGN_CENTER);
//縱向居中
nStyle.setVerticalAlignment(CellStyle.VERTICAL_CENTER);
//單元格垂直居中
nStyle.setFont(font); return nStyle;
}
//標題樣式
public CellStyle Title(Workbook wb,CellStyle nStyle,Font font){
font.setFontName("黑體");
font.setFontHeightInPoints((short) 12);
//橫向居中
nStyle.setAlignment(CellStyle.ALIGN_CENTER);
//縱向居中
nStyle.setVerticalAlignment(CellStyle.VERTICAL_CENTER);//單元格垂直居中
//表格線
nStyle.setBorderTop(CellStyle.BORDER_THICK);
//粗實線
nStyle.setBorderBottom(CellStyle.BORDER_THIN);
// 實線
nStyle.setBorderLeft(CellStyle.BORDER_THIN);
// 比較粗實線
nStyle.setBorderRight(CellStyle.BORDER_THIN);
// 實線
nStyle.setFont(font); return nStyle;
}
// 文字樣式
public CellStyle Text(Workbook wb,CellStyle nStyle,Font font){
font.setFontName("Times New Roman");
font.setFontHeightInPoints((short) 10);
//橫向居中
nStyle.setAlignment(CellStyle.ALIGN_CENTER);
//縱向居中
nStyle.setVerticalAlignment(CellStyle.VERTICAL_CENTER); //單元格垂直居中
// 表格線
nStyle.setBorderBottom(CellStyle.BORDER_THIN);
//實線
nStyle.setBorderLeft(CellStyle.BORDER_THIN);
// 比較粗實線
nStyle.setBorderRight(CellStyle.BORDER_THIN);
// 實線
nStyle.setFont(font); return nStyle;
}
完成下載去原來的new.xls文件查看