java如何读取整个excel文件的内容
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 = 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);
}
}
2017-07-03 · 百度知道合伙人官方认证企业
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);
}
}
在Java中读取Excel文件的内容
在这里,我使用的是一个叫Java Excel API的东西,类似的还有jakarta的POI,不过感觉那个
太复杂了点儿。而且jxl对中文的支持相当的好,至少我在用的过程中一点问题没出。
一、下载地址
http://www.andykhan.com/jexcelapi/
二、特性
可以读取Excel 95, 97, 2000文件
可以读或写Excel 97及其以后版本的的公式(不过我发现好像有bug)
生成Excel 97格式的电子表格
支持字体、数字和日期格式化
支持单元格的颜色和阴影
可以编辑现有的文件
三、读文件
//声明一下,记得后面要关闭哦。。
Workbook workbook = null;
try {
workbook = Workbook.getWorkbook(new File("d:\\temp\\TestRead.xls"));
} catch (Exception e) {
throw new Exception("file to import not found!");
}
Sheet sheet = workbook.getSheet(0);
Cell cell = null;
int columnCount=3;
int rowCount=sheet.getRows();
for (int i = 0; i<rowcount; p="" {
for (int j = 0; j<columncount; p="" {
//注意,这里的两个参数,第一个是表示列的,第二才表示行
cell=sheet.getCell(j, i);
//要根据单元格的类型分别做处理,否则格式化过的内容可能会不正确
if(cell.getType()==CellType.NUMBER){
System.out.print(((NumberCell)cell).getValue());
}
else if(cell.getType()==CellType.DATE){
System.out.print(((DateCell)cell).getDate());
}
else{
System.out.print(cell.getContents());
}
//System.out.print(cell.getContents());
System.out.print("\t");
}
System.out.print("\n");
}
//关闭它,否则会有内存泄露
workbook.close();
2016-04-30 · 知道合伙人互联网行家
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;
}
在java程序添加spire.xls.jar依赖,下面的代码可以读取整个工作表的数据
import com.spire.xls.*;
public class ReadExcel {
public static void main(String[] args) {
//创建Workbook对象
Workbook wb = new Workbook();
//加载一个Excel文档
wb.loadFromFile("C:\\Users\\Administrator\\Desktop\\test.xlsx");
//获取第一个工作表
Worksheet sheet = wb.getWorksheets().get(0);
//遍历工作表的每一行
for (int i = 1; i < sheet.getLastRow() + 1; i++) {
//遍历工作的每一列
for (int j = 1; j < sheet.getLastColumn() + 1; j++) {
//输出指定单元格的数据
System.out.print(sheet.get(i,j).getText());
System.out.print("\t");
}
System.out.print("\n");
}
}
}