package com.opensource.util.excel;
import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.InputStream;
import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.List;
import java.util.Map;
import javax.servlet.ServletOutputStream;
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.HSSFFont;
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.apache.poi.ss.util.Region;
import org.apache.struts.action.Action;
public class CreateSimpleExcelToDisk extends Action
{
public static void ExportExcel(List<List> allList,String inWeek, HttpServletResponse response) throws Exception
{
// The first step, create a webbook, corresponding to an Excel file
HSSFWorkbook wb = new HSSFWorkbook();
// The second step, add a sheet in the webbook, corresponding to the sheet in the Excel file
HSSFSheet sheet = wb.createSheet();
// The third step, add the 0th row of the header to the sheet, note that the old version of poi has a limit on the number of rows and columns in Excel.
HSSFRow rowT = sheet.createRow(0);
rowT.setHeight((short)450);
// The fourth step, create a cell, and set the value header to center the header
//style table body use
HSSFCellStyle style = wb.createCellStyle();
style.setAlignment(HSSFCellStyle.ALIGN_CENTER); // Create a centered format
style.setVerticalAlignment(HSSFCellStyle.VERTICAL_CENTER);
//style1 date week column is in use
HSSFCellStyle style1 = wb.createCellStyle();
style1.setVerticalAlignment(HSSFCellStyle.VERTICAL_CENTER);
style1.setAlignment(HSSFCellStyle.ALIGN_CENTER);
//title-specific style2
HSSFCellStyle style2 = wb.createCellStyle();
style2.setVerticalAlignment(HSSFCellStyle.VERTICAL_CENTER);
style2.setAlignment(HSSFCellStyle.ALIGN_CENTER);
// use style3 for column headers
HSSFCellStyle style3 = wb.createCellStyle();
style3.setAlignment(HSSFCellStyle.ALIGN_CENTER); // Create a centered format
style3.setVerticalAlignment(HSSFCellStyle.VERTICAL_CENTER);//Vertical center
//Use style for the first week
HSSFCellStyle style4 = wb.createCellStyle();
style4.setAlignment(HSSFCellStyle.ALIGN_CENTER); // Create a centered format
style4.setVerticalAlignment(HSSFCellStyle.VERTICAL_CENTER);//Vertical center
//add border
style.setBorderBottom(HSSFCellStyle.BORDER_THIN); //bottom border
style.setBorderLeft(HSSFCellStyle.BORDER_THIN);//左边框
// style.setBorderTop(HSSFCellStyle.BORDER_THIN);//Top border
style.setBorderRight(HSSFCellStyle.BORDER_THIN);//右边框
style1.setBorderBottom(HSSFCellStyle.BORDER_THIN); //bottom border
style1.setBorderLeft(HSSFCellStyle.BORDER_THIN);//左边框
style1.setBorderTop(HSSFCellStyle.BORDER_THIN);//Top border
style1.setBorderRight(HSSFCellStyle.BORDER_THIN);//右边框
style3.setBorderBottom(HSSFCellStyle.BORDER_THIN); //bottom border
style3.setBorderLeft(HSSFCellStyle.BORDER_THIN);//左边框
style3.setBorderTop(HSSFCellStyle.BORDER_THIN);//Top border
style3.setBorderRight(HSSFCellStyle.BORDER_THIN);//右边框
/**font start*/
//generate a font
HSSFFont font=wb.createFont();
font.setFontName("Imitation Song_GB2312");
//font.setColor(HSSFColor.BLACK.index);//HSSFColor.VIOLET.index //font color
font.setFontHeightInPoints((short)12);
//font.setBoldweight(HSSFFont.BOLDWEIGHT_BOLD); //Bold the font
//Apply the font to the current style
style.setFont(font);
/**font end*/
/**font start*/
//Generate a font date for the week
HSSFFont font1=wb.createFont();
font1.setFontName("Fake Song");
//font.setColor(HSSFColor.BLACK.index);//HSSFColor.VIOLET.index //font color
font1.setFontHeightInPoints((short)12);
font1.setBoldweight(HSSFFont.BOLDWEIGHT_BOLD); //Bold the font
//Apply the font to the current style
style1.setFont(font1);
/**font end*/
/**font start*/
//Generate a font title with
HSSFFont font2=wb.createFont();
font2.setFontName("Fake Song Dynasty");
//font.setColor(HSSFColor.BLACK.index);//HSSFColor.VIOLET.index //font color
font2.setFontHeightInPoints((short)16);
font2.setBoldweight(HSSFFont.BOLDWEIGHT_BOLD); //Bold the font
//Apply the font to the current style
style2.setFont(font2);
/**font end*/
/**font start*/
//Generate a font column header
HSSFFont font3=wb.createFont();
font3.setFontName("Fake Song Dynasty");
//font.setColor(HSSFColor.BLACK.index);//HSSFColor.VIOLET.index //font color
font3.setFontHeightInPoints((short)14);
font3.setBoldweight(HSSFFont.BOLDWEIGHT_BOLD); //Bold the font
//Apply the font to the current style
style3.setFont(font3);
/**font end*/
/**font start*/
//Generate a font column header
HSSFFont font4=wb.createFont();
font4.setFontName("Fake Song Dynasty");
//font.setColor(HSSFColor.BLACK.index);//HSSFColor.VIOLET.index //font color
font4.setFontHeightInPoints((short)11);
// font4.setBoldweight(HSSFFont.BOLDWEIGHT_BOLD); //Bold the font
//Apply the font to the current style
style4.setFont(font4);
/**font end*/
//Merge cells, the four parameters are: start row, start column, end row, end column
sheet.addMergedRegion(new Region(0,(short)0,0,(short)5));
HSSFCell cellT = rowT.createCell((short)0);
cellT.setCellValue("Company leadership week arrangement");
cellT.setCellStyle(style2);
HSSFRow row2 = sheet.createRow((int) 1);
row2.setHeight((short)435);
sheet.addMergedRegion(new Region(1,(short)0,1,(short)5));
HSSFCell cell2 = row2.createCell((short)0);//The parameter is the first column of this row
cell2.setCellValue(inWeek);
cell2.setCellStyle(style4);
HSSFRow row3 = sheet.createRow((int) 2);
//Automatically adjust the column width
// sheet.autoSizeColumn((short)0); //Adjust the width of the first column
// sheet.autoSizeColumn((short)1); //Adjust the width of the second column
// sheet.autoSizeColumn((short)2); //Adjust the width of the third column
// sheet.autoSizeColumn((short)3); //Adjust the width of the fourth column
// sheet.autoSizeColumn((short)4); //Adjust the width of the fifth column
// sheet.autoSizeColumn((short)5); //Adjust the width of the sixth column
HSSFCell cell = row3.createCell((short) 0);
row3.setHeight((short)500);
sheet.setColumnWidth((short) 0, (short) 3500);//Set the width
cell.setCellValue("date");
cell.setCellStyle(style3);
cell = row3.createCell((short) 1);
cell.setCellValue("week");
cell.setCellStyle(style3);
cell = row3.createCell((short) 2);
sheet.setColumnWidth((short) 2, (short) 3500);//Set the width
cell.setCellValue("time");
cell.setCellStyle(style3);
cell = row3.createCell((short) 3);
cell.setCellValue("地点");
cell.setCellStyle(style3);
cell = row3.createCell((short) 4);
sheet.setColumnWidth((short) 4, (short) 23000);//Set the width
cell.setCellValue("Participate in leadership");
cell.setCellStyle(style3);
cell = row3.createCell((short) 5);
sheet.setColumnWidth((short) 5, (short) 5000);//Set the width
cell.setCellValue("work items");
cell.setCellStyle(style3);
// The fifth step, write the entity data. In the actual application, the data is obtained from the database,
int lineNum = 3;
for(List list : allList)
{
for (int j = 0; j < list.size(); j++)
{
sheet.addMergedRegion(new Region(lineNum,(short)0, lineNum+(list.size()-1),(short)0));
sheet.addMergedRegion(new Region(lineNum,(short)1, lineNum+(list.size()-1),(short)1));
row3 = sheet.createRow(lineNum+j);
// get the object from the list
row3.setHeight((short) 420);
Map map = (Map)list.get(j);
// The fourth step, create the cell and set the value
HSSFCell cell4 =row3.createCell((short) 0);
cell4.setCellValue(map.get("riqi").toString());
cell4.setCellStyle(style1);
cell4=row3.createCell((short) 1);
cell4.setCellValue(dayForWeek(map.get("riqi").toString()));
cell4.setCellStyle(style1);
cell4=row3.createCell((short) 2);
cell4.setCellValue( map.get("shijian").toString());
cell4.setCellStyle(style);
cell4= row3.createCell((short) 3);
cell4.setCellValue( map.get("didian").toString());
cell4.setCellStyle(style);
cell4=row3.createCell((short) 4);
cell4.setCellValue( map.get("renyuan").toString());
cell4.setCellStyle(style);
cell4=row3.createCell((short) 5);
cell4.setCellValue(map.get("neirong").toString());
cell4.setCellStyle(style);
}
lineNum = lineNum + list.size();
}
// Step 6, save the file to the specified location
try
{
// FileOutputStream fout = new FileOutputStream("E:/students.xls");
// wb.write(fout);
// fout.close();
ByteArrayOutputStream os = new ByteArrayOutputStream();
wb.write(os);
byte[] content = os.toByteArray();
InputStream is = new ByteArrayInputStream(content);
response.reset();
response.setContentType("application/vnd.ms-excel;charset=utf-8");
response.setHeader("Content-Disposition", "attachment;filename="
+ new String(("Beijing Investment Company Leadership Week Work Arrangement"+inWeek+".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 (Exception e) {
throw e;
} finally {
if (bis != null)
bis.close();
if (bos != null)
bos.close();
}
}
catch (Exception e)
{
e.printStackTrace ();
}
}
// Determine the day of the week based on the date
public static String dayForWeek(String pTime) throws Exception {
SimpleDateFormat format = new SimpleDateFormat("yyyy/MM/dd");
Calendar c = Calendar.getInstance();
c.setTime(format.parse(pTime));
int dayForWeek = 0;
if (c.get(Calendar.DAY_OF_WEEK) == 1) {
dayForWeek = 7;
} else {
dayForWeek = c.get(Calendar.DAY_OF_WEEK) - 1;
}
String week = "Monday";
switch(dayForWeek)
{
case 1: week = "Monday"; break;
case 2: week = "Tuesday"; break;
case 3: week = "Wednesday"; break;
case 4: week = "Thursday"; break;
case 5: week = "Friday"; break;
case 6: week = "Saturday"; break;
default: week = "Sunday"; break;
}
return week;
}
}
Export in excel form, java implementation code
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