maven依赖:
首先在maven中添加:
<!-- /artifact/org.apache.poi/poi --><dependency><groupId>org.apache.poi</groupId><artifactId>poi-ooxml</artifactId><version>3.10-FINAL</version></dependency>
读取:
java读取excel的思路很简单,先读取行(HXXFRow类或XSSFRow类),然后得到列(.getRow(列下标)),这样就可以定位一个单元格了
import org.apache.poi.hssf.usermodel.HSSFSheet;import org.apache.poi.hssf.usermodel.HSSFWorkbook;import org.apache.poi.xssf.usermodel.XSSFRow;import org.apache.poi.xssf.usermodel.XSSFSheet;import org.apache.poi.xssf.usermodel.XSSFWorkbook;import java.io.FileInputStream;import java.io.InputStream;/**使用例子* ReadExcel excel = new ReadExcel("D:\\myexcel.xlsx");* String[] firstLine = excel.readLine(0);//得到第一行数据* String[] firstLine = excel.readLine(1);//得到第二行数据*/public class ReadExcel {private HSSFSheet hssfSheet;//.xlsprivate XSSFSheet xssfSheet;//.xlsxpublic int getAllRowNumber() {return xssfSheet.getLastRowNum();}/*读取 excel 下标为 rowNumber 的那一行的全部数据*/public String[] readLine(int rowNumber) {XSSFRow row = xssfSheet.getRow(rowNumber);if (row != null) {String[] resultStr = new String[row.getLastCellNum()];for (int i = 0; i < row.getLastCellNum(); i++) {resultStr[i] = row.getCell(i).getStringCellValue();}return resultStr;}return null;}public ReadExcel(String excelPath) throws Exception {String fileType = excelPath.substring(excelPath.lastIndexOf(".") + 1, excelPath.length());// 创建工作文档对象InputStream in = new FileInputStream(excelPath);HSSFWorkbook hssfWorkbook = null;//.xlsXSSFWorkbook xssfWorkbook = null;//.xlsx//根据后缀创建读取不同类型的excelif (fileType.equals("xls")) {hssfWorkbook = new HSSFWorkbook(in);//它是专门读取.xls的} else if (fileType.equals("xlsx")) {xssfWorkbook = new XSSFWorkbook(in);//它是专门读取.xlsx的} else {throw new Exception("文档格式后缀不正确!!！");}/*这里默认只读取第 1 个sheet*/if (hssfWorkbook != null) {this.hssfSheet = hssfWorkbook.getSheetAt(0);} else if (xssfWorkbook != null) {this.xssfSheet = xssfWorkbook.getSheetAt(0);}}}
写入:
java写入excel的思路是:
1.先创建一个Workbook类,然后根据想要创建的文档类型来new 不同类型的实例(.xls就是new HSSFWorkbook() , 而.xlsx是new XSSFWorkbook()),
2.创建好文档对象后,创建第一张表(workbook.createSheet("String类型的表名称"))
3.然后在这张表(sheet)中的指定行号中创建行(sheet.createRow(int类型的指定行号))
4.在这行中指定一个列号,用来指定具体单元格的坐标(row.createCell(int类型的列号))
5.写入数据(cell.setCellValue(写入的内容))
package excelUtils;import org.apache.poi.hssf.usermodel.HSSFWorkbook;import org.apache.poi.ss.usermodel.Cell;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.xssf.usermodel.XSSFWorkbook;import java.io.FileOutputStream;import java.io.OutputStream;public class WriteExcel {private String pathname;private Workbook workbook;private Sheet sheet1;/**使用栗子* WriteExcel excel = new WriteExcel("D:\\myexcel.xlsx");* excel.write(new String[]{"1","2"}, 0);//在第1行第1个单元格写入1,第一行第二个单元格写入2*/public void write(String[] writeStrings, int rowNumber) throws Exception {//将内容写入指定的行号中Row row = sheet1.createRow(rowNumber);//遍历整行中的列序号for (int j = 0; j < writeStrings.length; j++) {//根据行指定列坐标j,然后在单元格中写入数据Cell cell = row.createCell(j);cell.setCellValue(writeStrings[j]);}OutputStream stream = new FileOutputStream(pathname);workbook.write(stream);stream.close();}public WriteExcel(String excelPath) throws Exception {//在excelPath中需要指定具体的文件名(需要带上.xls或.xlsx的后缀)this.pathname = excelPath;String fileType = excelPath.substring(excelPath.lastIndexOf(".") + 1, excelPath.length());//创建文档对象if (fileType.equals("xls")) {//如果是.xls,就new HSSFWorkbook()workbook = new HSSFWorkbook();} else if (fileType.equals("xlsx")) {//如果是.xlsx,就new XSSFWorkbook()workbook = new XSSFWorkbook();} else {throw new Exception("文档格式后缀不正确!!！");}// 创建表sheetsheet1 = workbook.createSheet("sheet1");}}
