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java如何讀取整個excel文件的內容
本例使用java來讀取excel的內容並展出出結果，代碼如下：
複製代碼 代碼如下:
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;irowLength;i++) {
for(int j=0;jresult[i].length;j++) {
System.out.print(result[i][j]+”\t\t”);
}
System.out.println();
}
}
/**
* 讀取Excel的內容，第一維數組存儲的是一行中格列的值，二維數組存儲的是多少個行
* @param file 讀取數據的源Excel
* @param ignoreRows 讀取數據忽略的行數，比喻行頭不需要讀入 忽略的行數為1
* @return 讀出的Excel中數據的內容
* @throws FileNotFoundException
* @throws IOException
*/
public static String[][] getData(File file, int ignoreRows)
throws FileNotFoundException, IOException {
ListString[] result = new ArrayListString[]();
int rowSize = 0;
BufferedInputStream in = new BufferedInputStream(new FileInputStream(
file));
// 打開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);
// 第一行為標題，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：一定要設成這個，否則可能會出現亂碼
cell.setEncoding(HSSFCell.ENCODING_UTF_16);
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:
// 導入時如果為公式生成的數據則無值
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;
}
/**
* 去掉字符串右邊的空格
* @param str 要處理的字符串
* @return 處理後的字符串
*/
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);
}
}
java如何讀取整個excel文件的內容？
在java程序添加spire.xls.jar依賴
import com.spire.xls.*;
public class ReadExcel {
public static void main(String[] args) {
//創建Workbook對象
Workbook wb = new Workbook();
//加載一個Excel文檔
wb.loadFromFile(“C:\\Users\\Administrator\\Desktop\\test.xlsx”);
//獲取第一個工作表
Worksheet sheet = wb.getWorksheets().get(0);
//遍歷工作表的每一行
for (int i = 1; i sheet.getLastRow() + 1; i++) {
//遍歷工作的每一列
for (int j = 1; j sheet.getLastColumn() + 1; j++) {
//輸出指定單元格的數據
System.out.print(sheet.get(i,j).getText());
System.out.print(“\t”);
}
System.out.print(“\n”);
}
}
}
用java代碼實現讀取Excel中每個sheet頁的內容，並且要與其他的Excel中某一列的值進行
/**
*
* p標題：readExcel/p
* p描述：讀取Excel文件數據/p
* @param excelfilePath Excel文件路徑
* @param startRow 開始行
* @param startCol 開始列
* @return ListArrayListString
* @throws IOException
* @throws BiffException
*/
public ListMapString, Object readExcel(String excelfilePath,int startRow, int startCol)
throws IOException, BiffException {
// 讀取xls文件
InputStream ins = new FileInputStream(excelfilePath);
// 設置讀文件編碼
WorkbookSettings setEncode = new WorkbookSettings();
setEncode.setEncoding(“UTF-8”);
Workbook rwb = Workbook.getWorkbook(ins, setEncode);
ListMapString, Object alldata = new ArrayListMapString, Object();
MapString, Object data = null;
alldata.clear();
// 獲得當前Excel表共有幾個sheet
Sheet[] sheets = rwb.getSheets();
// 獲得表數
int pages = sheets.length;
// 將excel表中的數據讀取出來
// 在從Excel中讀取數據的時候不需要知道每個sheet有幾行，有那多少列
for (int i = 0; i pages; i++) {
//這裡讀取excel中每個sheet的數據，Sheet sheet = rwb.getSheet(i); 讀取第二個sheet就是getSheet(1);
Sheet sheet = rwb.getSheet(i);
int cols = sheet.getColumns(); // 列
// 讀取每一行對應的列數目
// 循環讀取每一行的全部列數目的內容
int rows = sheet.getRows(); // 行
for (int r = startRow; r rows; r++) {
data = new HashMapString, Object();
// 行循環,Excel的行列是從（0，0）開始
for (int c = startCol; c cols; c++) {
Cell excelRows = sheet.getCell(c, r);
data.put(“bgbh”, excelRows.getContents());
}
alldata.add(data);
}
}
ins.close();
return alldata;
}
原創文章，作者：小藍，如若轉載，請註明出處：https://www.506064.com/zh-hant/n/158215.html
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