Without further ado, look at the code:
ExcelUtil.java
package pers.kangxu.datautils.utils;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import org.apache.poi.hssf.usermodel.HSSFCellStyle;
import org.apache.poi.hssf.usermodel.HSSFFont;
import org.apache.poi.hssf.usermodel.HSSFWorkbook;
import org.apache.poi.ss.usermodel.Cell;
import org.apache.poi.ss.usermodel.CellStyle;
import org.apache.poi.ss.usermodel.CellValue;
import org.apache.poi.ss.usermodel.Font;
import org.apache.poi.ss.usermodel.FormulaEvaluator;
import org.apache.poi.ss.usermodel.Row;
import org.apache.poi.ss.usermodel.Sheet;
import org.apache.poi.ss.usermodel.Workbook;
import org.apache.poi.ss.util.CellRangeAddress;
/**
*
* <b>
* excel tool
* </b>
* @author kangxu
*
*/
public class ExcelUtil {
/**
* export excel
* @param filePath File full path
* @param sheetName sheet The name of the page
* @param sheetIndex The current sheet The following table from 0 start
* @param fileHeader The head
* @param datas content
*/
public static void writeExcel(String filePath,String sheetName,
int sheetIndex,
String[] fileHeader,
List<String[]> datas){
// Create a workbook
Workbook wb = new HSSFWorkbook();
// Create worksheets sheet
Sheet s = wb.createSheet();
wb.setSheetName(sheetIndex, sheetName);
Row r = s.createRow(0);
Cell c = null;
Font font = null;
CellStyle styleHeader = null;
CellStyle styleContent = null;
// The bold
font = wb.createFont();
font.setBoldweight(HSSFFont.BOLDWEIGHT_BOLD);
// Set header style
styleHeader = wb.createCellStyle();
styleHeader.setFont(font);
styleHeader.setBorderBottom(HSSFCellStyle.BORDER_THIN); // Under the frame
styleHeader.setBorderLeft(HSSFCellStyle.BORDER_THIN);// The left margin
styleHeader.setBorderTop(HSSFCellStyle.BORDER_THIN);// On the border
styleHeader.setBorderRight(HSSFCellStyle.BORDER_THIN);// Right margin
// Set content style
styleContent = wb.createCellStyle();
styleContent.setBorderBottom(HSSFCellStyle.BORDER_THIN); // Under the frame
styleContent.setBorderLeft(HSSFCellStyle.BORDER_THIN);// The left margin
styleContent.setBorderTop(HSSFCellStyle.BORDER_THIN);// On the border
styleContent.setBorderRight(HSSFCellStyle.BORDER_THIN);// Right margin
// Set head
for(int i=0;i<fileHeader.length;){
c = r.createCell(i);
c.setCellStyle(styleHeader);
c.setCellValue(fileHeader[i]);
i++;
}
// Set the content
for(int rownum=0;rownum<datas.size();){ // line row datas.size()
r = s.createRow(rownum+1); // Create a line
for(int cellnum=0;cellnum<fileHeader.length;){
c = r.createCell(cellnum);
c.setCellValue(datas.get(rownum)[cellnum]);
c.setCellStyle(styleContent);
cellnum++;
}
rownum++;
}
FileOutputStream out = null;
try {
// Create a file or folder , Write it in
if(FileUtil.createFile(new File(filePath))){
out = new FileOutputStream(filePath);
wb.write(out);
}
} catch (Exception e) {
e.printStackTrace();
}finally {
try {
// Close the stream
if(out != null){
out.flush();
out.close();
}
} catch (IOException e) {
e.printStackTrace();
}
}
}
/**
* read excel The file content
* @param filePath
* @param sheetIndex
*/
public static List<Map<String,String>> readExcel(String filePath,int sheetIndex){
List<Map<String,String>> mapList = new ArrayList<Map<String,String>>();
// head
List<String> list = new ArrayList<String>();
//
int cnt = 0;
int idx = 0;
try {
InputStream input = new FileInputStream(filePath); // Establishing the input stream
Workbook wb = null;
wb = new HSSFWorkbook(input);
// To obtain sheet page
Sheet sheet = wb.getSheetAt(sheetIndex);
Iterator<Row> rows = sheet.rowIterator();
while (rows.hasNext()) {
Row row = rows.next();
Iterator<Cell> cells = row.cellIterator();
Map<String,String> map = new HashMap<String,String>();
if(cnt == 0){ // His head into the list In the
while (cells.hasNext()) {
Cell cell = cells.next();
if(isContainMergeCell(sheet)){
cancelMergeCell(sheet);
}
list.add(getStringCellValue(cell));
}
cnt ++;
continue;
}else {
while (cells.hasNext()) {
Cell cell = cells.next();
if(isContainMergeCell(sheet)){
cancelMergeCell(sheet);
}
// Distinguish the same head
list = ListUtil.changeSameVal(list);
map.put(list.get(idx++), getStringCellValue(cell));
}
}
idx = 0;
mapList.add(map);
}
return mapList;
} catch (IOException ex) {
ex.printStackTrace();
}
return null;
}
/**
* Merge cell
* @param sheet The current sheet page
* @param firstRow Start line
* @param lastRow End line
* @param firstCol Start column
* @param lastCol The end of the column
*/
public static int mergeCell(Sheet sheet,int firstRow,int lastRow,int firstCol,int lastCol){
if(sheet == null){
return -1;
}
return sheet.addMergedRegion(new CellRangeAddress(firstRow, lastRow, firstCol, lastCol));
}
/**
* Cancel the merge cell
* @param sheet
* @param idx
*/
public static void cancelMergeCell(Sheet sheet){
int sheetMergeCount = sheet.getNumMergedRegions();
for(int idx = 0; idx < sheetMergeCount;){
CellRangeAddress range = sheet.getMergedRegion(idx);
String val = getMergeCellValue(sheet,range.getFirstRow(),range.getLastRow());
// Cancel the merge cell
sheet.removeMergedRegion(idx);
for(int rownum=range.getFirstRow();rownum<range.getLastRow()+1;){
for(int cellnum=range.getFirstColumn();cellnum<range.getLastColumn()+1;){
sheet.getRow(rownum).getCell(cellnum).setCellValue(val);
cellnum ++;
}
rownum ++;
}
idx++;
}
}
/**
* Determines whether the specified cell is a merged cell
* @param sheet The current sheet page
* @param firstRow Start line
* @param lastRow End line
* @param firstCol Start column
* @param lastCol The end of the column
* @return
*/
public static boolean isMergeCell(Sheet sheet,
int row ,int column){
int sheetMergeCount = sheet.getNumMergedRegions();
for(int i = 0; i < sheetMergeCount;){
CellRangeAddress range = sheet.getMergedRegion(i);
int firstColumn = range.getFirstColumn();
int lastColumn = range.getLastColumn();
int firstRow = range.getFirstRow();
int lastRow = range.getLastRow();
if(row >= firstRow && row <= lastRow){
if(column >= firstColumn && column <= lastColumn){
return true;
}
}
i++;
}
return false;
}
/**
* judge sheet Page contains merged cells
* @param sheet
* @return
*/
public static boolean isContainMergeCell(Sheet sheet){
if(sheet == null){
return false;
}
return sheet.getNumMergedRegions()>0 ? true : false;
}
/**
* Gets the value of the specified merge unit
* @param sheet
* @param row
* @param column
* @return
*/
public static String getMergeCellValue(Sheet sheet,
int row ,int column){
int sheetMergeCount = sheet.getNumMergedRegions();
for(int i = 0; i < sheetMergeCount;){
CellRangeAddress range = sheet.getMergedRegion(i);
int firstColumn = range.getFirstColumn();
int lastColumn = range.getLastColumn();
int firstRow = range.getFirstRow();
int lastRow = range.getLastRow();
if(row >= firstRow && row <= lastRow){
if(column >= firstColumn && column <= lastColumn){
Row fRow = sheet.getRow(firstRow);
Cell fCell = fRow.getCell(firstColumn);
return getStringCellValue(fCell) ;
}
}
i++;
}
return null;
}
/**
* Gets the value of the cell
* @param cell
* @return
*/
public static String getStringCellValue(Cell cell) {
String strCell = "";
if(cell==null) return strCell;
switch (cell.getCellType()) {
case Cell.CELL_TYPE_STRING:
strCell = cell.getRichStringCellValue().getString().trim();
break;
case Cell.CELL_TYPE_NUMERIC:
strCell = String.valueOf(cell.getNumericCellValue());
break;
case Cell.CELL_TYPE_BOOLEAN:
strCell = String.valueOf(cell.getBooleanCellValue());
break;
case Cell.CELL_TYPE_FORMULA:
FormulaEvaluator evaluator = cell.getSheet().getWorkbook().getCreationHelper().createFormulaEvaluator();
evaluator.evaluateFormulaCell(cell);
CellValue cellValue = evaluator.evaluate(cell);
strCell = String.valueOf(cellValue.getNumberValue()) ;
break;
default:
strCell = "";
}
return strCell;
}
}This is called as follows
ExcelUtilTester.java
package pers.kangxu.datautils.test;
import java.util.ArrayList;
import java.util.List;
import pers.kangxu.datautils.utils.ExcelUtil;
public class ExcelUtilTester {
public static void main(String[] args) {
List<String[]> datas = new ArrayList<String[]>();
datas.add(new String[]{" bear "," The mother ","250"});
datas.add(new String[]{" The pig food "," unknown ","251"});
//ExcelUtil.writeExcel("C:\\Users\\Administrator\\Desktop\\test\\test\\test.xls","sheet1",0, new String[]{" The name "," age "," gender "}, datas);
System.out.println(ExcelUtil.readExcel("C:\\Users\\Administrator\\Desktop\\test\\test\\test.xls", 0));
}
}