Question

java怎么读取excel文件

Answer 1

参考代码及注释如下：

import Java.io.File; 
import java.io.FileInputStream; 
import java.io.FileNotFoundException; 
import java.io.IOException; 
import java.io.InputStream; 
  
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; 
public class ReadExcel {
  public static void readExcel(File file){ 
         try { 
             InputStream inputStream = new FileInputStream(file); 
             String fileName = file.getName(); 
             Workbook wb = null; 
            // poi-3.9.jar  只可以读取2007以下的版本，后缀为：xsl
             wb = new HSSFWorkbook(inputStream);//解析xls格式 
            
             Sheet sheet = wb.getSheetAt(0);//第一个工作表  ，第二个则为1，以此类推...
               
             int firstRowIndex = sheet.getFirstRowNum(); 
             int lastRowIndex = sheet.getLastRowNum(); 
             for(int rIndex = firstRowIndex; rIndex <= lastRowIndex; rIndex ++){ 
                 Row row = sheet.getRow(rIndex); 
                 if(row != null){ 
                     int firstCellIndex = row.getFirstCellNum(); 
                    // int lastCellIndex = row.getLastCellNum(); 
                     //此处参数cIndex决定可以取到excel的列数。
                     for(int cIndex = firstCellIndex; cIndex < 3; cIndex ++){ 
                         Cell cell = row.getCell(cIndex); 
                         String value = ""; 
                         if(cell != null){ 
                             value = cell.toString(); 
                             System.out.print(value+"\t"); 
                         } 
                     } 
                     System.out.println(); 
                 } 
             } 
         } catch (FileNotFoundException e) { 
             // TODO 自动生成 catch 块 
             e.printStackTrace(); 
         } catch (IOException e) { 
             // TODO 自动生成 catch 块 
             e.printStackTrace(); 
         } 
     } 
  public static void main(String[] args) {
  File file = new File("D:/test.xls");
  readExcel(file);
 }
}

Answer 2

import java.io.BufferedInputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.text.DecimalFormat;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Date;
import java.util.List;

import org.apache.poi.hssf.usermodel.HSSFCell;
import org.apache.poi.hssf.usermodel.HSSFDateUtil;
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.poifs.filesystem.POIFSFileSystem;

public class ExcelHandle {
public static void main(String[] args) throws Exception {
File file = new File("sss.xls");
String[][] result = getData(file, 1);
int rowLength = result.length;
for(int i=0;i<rowLength;i++) {
for(int j=0;j<result[i].length;j++) {
System.out.print(result[i][j]+"\t\t");
}
System.out.println();
}

}
/**
* 读取Excel的内容，第一维数组存储的是一行中格列的值，二维数组存储的是多少个行
* @param file 读取数据的源Excel
* @param ignoreRows 读取数据忽略的行数，比喻行头不需要读入 忽略的行数为1
* @return 读出的Excel中数据的内容
* @throws FileNotFoundException
* @throws IOException
*/
public static String[][] getData(File file, int ignoreRows)throws FileNotFoundException, IOException {
List<String[]> result = new ArrayList<String[]>();
int rowSize = 0;
BufferedInputStream in = new BufferedInputStream(new FileInputStream(
file));
// 打开HSSFWorkbook
POIFSFileSystem fs = new POIFSFileSystem(in);
HSSFWorkbook wb = new HSSFWorkbook(fs);
HSSFCell cell = null;
for (int sheetIndex = 0; sheetIndex < wb.getNumberOfSheets(); sheetIndex++) {
HSSFSheet st = wb.getSheetAt(sheetIndex);
// 第一行为标题，不取
for (int rowIndex = ignoreRows; rowIndex <= st.getLastRowNum(); rowIndex++) {
HSSFRow row = st.getRow(rowIndex);
if (row == null) {
continue;
}
int tempRowSize = row.getLastCellNum() + 1;
if (tempRowSize > rowSize) {
rowSize = tempRowSize;
}
String[] values = new String[rowSize];
Arrays.fill(values, "");
boolean hasValue = false;
for (short columnIndex = 0; columnIndex <= row.getLastCellNum(); columnIndex++) {
String value = "";
cell = row.getCell(columnIndex);
if (cell != null) {
// 注意：一定要设成这个，否则可能会出现乱码cell.setEncoding(HSSFCell.ENCODING_UTF_16); 3.2已经自动Unicode处理了
switch (cell.getCellType()) {
case HSSFCell.CELL_TYPE_STRING:
value = cell.getStringCellValue();
break;
case HSSFCell.CELL_TYPE_NUMERIC:
if (HSSFDateUtil.isCellDateFormatted(cell)) {
Date date = cell.getDateCellValue();
if (date != null) {
value = new SimpleDateFormat("yyyy-MM-dd").format(date);
} else {
value = "";
}
} else {
value = new DecimalFormat("0").format(cell.getNumericCellValue());
}
break;
case HSSFCell.CELL_TYPE_FORMULA:
// 导入时如果为公式生成的数据则无值
if (!cell.getStringCellValue().equals("")) {
value = cell.getStringCellValue();
} else {
value = cell.getNumericCellValue() + "";
}
break;
case HSSFCell.CELL_TYPE_BLANK:
break;
case HSSFCell.CELL_TYPE_ERROR:
value = "";
break;
case HSSFCell.CELL_TYPE_BOOLEAN:
value = (cell.getBooleanCellValue() == true ? "Y": "N");
break;
default:
value = "";
}
}
if (columnIndex == 0 && value.trim().equals("")) {
break;
}
values[columnIndex] = rightTrim(value);
hasValue = true;
}

if (hasValue) {
result.add(values);
}
}
}
in.close();
String[][] returnArray = new String[result.size()][rowSize];
for (int i = 0; i < returnArray.length; i++) {
returnArray[i] = (String[]) result.get(i);
}
return returnArray;
}

/**
* 去掉字符串右边的空格
* @param str 要处理的字符串
* @return 处理后的字符串
*/
public static String rightTrim(String str) {
if (str == null) {
return "";
}
int length = str.length();
for (int i = length - 1; i >= 0; i--) {
if (str.charAt(i) != 0x20) {
break;
}
length--;
}
return str.substring(0, length);
}
}

给你个例子代码，应该能帮到你！