java如何读取整个excel文件的内容

Question

如题所述

Answer 1

工具：
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

这个问题在java贴吧里常见，并且有很多方式完成，这里就给你贴一份，你试着在贴吧里和百度知道里，学习程序方面的问题解答。
public String[][] readExcel(String filePath) {
String[][] s = null;
try {
HSSFWorkbook workbook = new HSSFWorkbook(new FileInputStream(
filePath));
HSSFSheet sheet = workbook.getSheetAt(0);
int rows = sheet.getPhysicalNumberOfRows();
s = new String[rows][];
if (rows > 0) {
// 获取总列数`
int cells = sheet.getRow(0).getPhysicalNumberOfCells();
for (int r =0; r < rows; r++) {

HSSFRow row = sheet.getRow(r);
String[] cellsvalue = new String[cells+1];
for (short c = 0; c < cells; c++) {
String value = "";
HSSFCell cell = row.getCell(c);
if (cell != null) {
switch (cell.getCellType()) {
case HSSFCell.CELL_TYPE_FORMULA:
//
break;
case HSSFCell.CELL_TYPE_NUMERIC:
if (HSSFDateUtil.isCellDateFormatted(cell)) {
value = new java.text.SimpleDateFormat(
"yyyy-MM-dd").format(cell
.getDateCellValue());
} else {
value = String.valueOf(cell
.getNumericCellValue());
}
break;
case HSSFCell.CELL_TYPE_STRING:
value = cell.getStringCellValue();
break;
case HSSFCell.CELL_TYPE_BLANK:
value="";
default:
break;
}
if (cell == null) {
value="";
}
}
cellsvalue[c] = value;
if(value.endsWith(".0")){
cellsvalue[c] = value.substring(0, value.length()-2);
}
}
s[r] = cellsvalue;
java.io.File myfile = new java.io.File(filePath);
if (myfile.exists()) {
myfile.delete();
}
}
}
} catch (Exception ex) {
// TODO 自动生成 catch 块

ex.printStackTrace();
}
return s;
}

Answer 3

本例使用java来读取excel的内容并展出出结果，代码如下：

复制代码 代码如下:

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 ExcelOperate {

public static void main(String[] args) throws Exception {
File file = new File("ExcelDemo.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);
switch (cell.getCellType()) {
case HSSFCell.CELL_TYPE_STRING:
value = c