Excel 之Java读取

最新推荐文章于 2024-07-10 02:44:42 发布

原创最新推荐文章于 2024-07-10 02:44:42 发布 · 231 阅读

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文章标签：

#Excel #Java #CSV #xls #xlsx

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做自动化报表收集，少不了读取CSV、xls、xlsx文件，以下用Java语言读取这些数据。
首先用到的jar包
dom4j-1.6.1.jar
geronimo-stax-api_1.0_spec-1.0.jar
opencsv-2.3.jar
poi-3.7-20101029.jar
poi-examples-3.7-20101029.jar
poi-ooxml-3.7-20101029.jar
poi-ooxml-schemas-3.7-20101029.jar
poi-scratchpad-3.7-20101029.jar
xmlbeans-2.3.0.jar
下载地址：http://download.youkuaiyun.com/download/qq_25034451/10261070

读取CSV文件

try {
                FileReader fReader;
                fReader = new FileReader(file);
                CSVReader csvReader = new CSVReader(fReader);  
                List<String[]> list = csvReader.readAll();  
                csvReader.close();l
                return rowList;
            } catch (FileNotFoundException e) {
                e.printStackTrace();
            } catch (IOException e) {
                e.printStackTrace();
            }

读取的数据将保存在list 中，然后我们可以处理了。

读取xls文件

try{
            //创建存储数据数组
            ArrayList<ArrayList<Object>> rowList = new ArrayList<ArrayList<Object>>();
            //一行的对象数组
            ArrayList<Object> colList;
            //工作文件
            HSSFWorkbook wb = new HSSFWorkbook(new FileInputStream(file));
            //工作表0
            HSSFSheet sheet = wb.getSheetAt(0);
            //行变量
            HSSFRow row;
            //单元格变量
            HSSFCell cell;
            //值变量
            Object value;
            //从第0行起，读取每一行数据
            for(int i = 0 ; i < sheet.getLastRowNum() ; i++ ){
                //获取i行数据
                row = sheet.getRow(i);
                //创建用于存储这一行数据的数组
                colList = new ArrayList<Object>();
                //若为空，则添加数组大小为0的数据行
                if(row == null){
                    rowList.add(colList);
                    continue;
                }
                //遍历一行数据
                for( int j = 0 ; j <row.getLastCellNum() ;j++){
                    //获取单元格
                    cell = row.getCell(j);
                    if(cell == null || cell.getCellType() == HSSFCell.CELL_TYPE_BLANK){
                        //当该单元格为空
                        colList.add("");
                        continue;
                    }
                    //根据单元格数据类型获取String值
                    switch(cell.getCellType()){
                     case XSSFCell.CELL_TYPE_STRING:  
                            value = cell.getStringCellValue();  
                            break;  
                        case XSSFCell.CELL_TYPE_NUMERIC:  
                            if ("@".equals(cell.getCellStyle().getDataFormatString())) {  
                                value = df.format(cell.getNumericCellValue());  
                            } else if ("General".equals(cell.getCellStyle()  
                                    .getDataFormatString())) {  
                                value = nf.format(cell.getNumericCellValue());  
                            } else {  
                                value = sdf.format(HSSFDateUtil.getJavaDate(cell  
                                        .getNumericCellValue()));  
                            }  
                            break;  
                        case XSSFCell.CELL_TYPE_BOOLEAN:  
                            value = Boolean.valueOf(cell.getBooleanCellValue());
                            break;  
                        case XSSFCell.CELL_TYPE_BLANK:  
                            value = "";  
                            break;  
                        default:  
                            value = cell.toString();  
                    }// end switch
                    colList.add(value);
                }//end for j
                rowList.add(colList);
            }//end for i

            return rowList;
        }catch(Exception e){
            return null;
        }

数据存储在rowList 中，根据需求做相应的处理

读取xlsx文件

与xls文件类似，但改变了类

try{
            ArrayList<ArrayList<Object>> rowList = new ArrayList<ArrayList<Object>>();
            ArrayList<Object> colList;
            XSSFWorkbook wb = new XSSFWorkbook(new FileInputStream(file));
            XSSFSheet sheet = wb.getSheetAt(0);
            XSSFRow row;
            XSSFCell cell;
            Object value;
            for(int i =0 ; i < sheet.getLastRowNum(); i++ ){
                row = sheet.getRow(i);
                colList = new ArrayList<Object>();
                if(row == null){
                    rowList.add(colList);
                    continue;
                }
                for( int j = 0 ; j < row.getLastCellNum() ;j++){
                    cell = row.getCell(j);
                    if(cell == null || cell.getCellType() == HSSFCell.CELL_TYPE_BLANK){
                        colList.add("");
                        continue;
                    }
                    switch(cell.getCellType()){
                     case XSSFCell.CELL_TYPE_STRING:  
                            value = cell.getStringCellValue();  
                            break;  
                        case XSSFCell.CELL_TYPE_NUMERIC:  
                            if ("@".equals(cell.getCellStyle().getDataFormatString())) {  
                                value = df.format(cell.getNumericCellValue());  
                            } else if ("General".equals(cell.getCellStyle()  
                                    .getDataFormatString())) {  
                                value = nf.format(cell.getNumericCellValue());  
                            } else {  
                                value = sdf.format(HSSFDateUtil.getJavaDate(cell  
                                        .getNumericCellValue()));  
                            }  

                            break;  
                        case XSSFCell.CELL_TYPE_BOOLEAN:  
                            value = Boolean.valueOf(cell.getBooleanCellValue());
                            break;  
                        case XSSFCell.CELL_TYPE_BLANK:  
                            value = "";  
                            break;  
                        default:  
                            value = cell.toString();  
                    }// end switch
                    colList.add(value);
                }//end for j
                rowList.add(colList);
            }//end for i

            return rowList;
        }catch(Exception e){
            e.printStackTrace();
            return null;
        }

为了做出统一个工具类，对CSV文件的读写做更改

try {
                ArrayList<ArrayList<Object>> rowList = new ArrayList<ArrayList<Object>>();
                ArrayList<Object> colList;
                FileReader fReader;
                fReader = new FileReader(file);
                CSVReader csvReader = new CSVReader(fReader);  
                List<String[]> list = csvReader.readAll();  
                for(String[] ss : list){  
                    colList =new ArrayList<Object>(Arrays.asList(ss));
                    rowList.add(colList); 
                } 
                csvReader.close();
                return rowList;
            } catch (FileNotFoundException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
                return null;
            } catch (IOException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
                return null;
            }

完整的工具类

import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.IOException;
import java.text.DecimalFormat;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Arrays;
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.xssf.usermodel.XSSFCell;
import org.apache.poi.xssf.usermodel.XSSFRow;
import org.apache.poi.xssf.usermodel.XSSFSheet;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;

import au.com.bytecode.opencsv.CSVReader;

public class ExcelUtil {
    //默认单元格内容为数字时格式
    private static DecimalFormat df = new DecimalFormat("0");
    // 默认单元格格式化日期字符串 
    private static SimpleDateFormat sdf = new SimpleDateFormat(  "yyyy-MM-dd HH:mm:ss"); 
    // 格式化数字
    private static DecimalFormat nf = new DecimalFormat("0.00");  
    public static ArrayList<ArrayList<Object>> readExcel(File file){
        if(file == null){
            return null;
        }
        if(file.getName().endsWith("xlsx")){
            //处理ecxel2007
            return readExcel2007(file);
        }else if(file.getName().endsWith("xls")) {
            //处理ecxel2003
            return readExcel2003(file);
        }else if(file.getName().endsWith("csv")){
            //处理csv文件
            return readCSV(file);
        }else{
            return null;
        }
    }
    /**
     * 读取CSV文件
     * @param file
     * @return
     */
    private static ArrayList<ArrayList<Object>> readCSV(File file) {
            try {
                ArrayList<ArrayList<Object>> rowList = new ArrayList<ArrayList<Object>>();
                ArrayList<Object> colList;
                FileReader fReader;
                fReader = new FileReader(file);
                CSVReader csvReader = new CSVReader(fReader);  
                List<String[]> list = csvReader.readAll();  
                for(String[] ss : list){  
                    colList =new ArrayList<Object>(Arrays.asList(ss));
                    rowList.add(colList); 
                } 
                csvReader.close();
                return rowList;
            } catch (FileNotFoundException e) {
                e.printStackTrace();
                return null;
            } catch (IOException e) {
                e.printStackTrace();
                return null;
            }  

    }

    public static ArrayList<ArrayList<Object>> readExcel2003(File file){
        try{
            //创建存储数据数组
            ArrayList<ArrayList<Object>> rowList = new ArrayList<ArrayList<Object>>();
            //一行的对象数组
            ArrayList<Object> colList;
            //工作文件
            HSSFWorkbook wb = new HSSFWorkbook(new FileInputStream(file));
            //工作表0
            HSSFSheet sheet = wb.getSheetAt(0);
            //行变量
            HSSFRow row;
            //单元格变量
            HSSFCell cell;
            //值变量
            Object value;
            //从第0行起，读取每一行数据
            for(int i = 0 ; i < sheet.getLastRowNum() ; i++ ){
                //获取i行数据
                row = sheet.getRow(i);
                //创建用于存储这一行数据的数组
                colList = new ArrayList<Object>();
                //若为空，则添加数组大小为0的数据行
                if(row == null){
                    rowList.add(colList);
                    continue;
                }
                //遍历一行数据
                for( int j = 0 ; j <row.getLastCellNum() ;j++){
                    //获取单元格
                    cell = row.getCell(j);
                    if(cell == null || cell.getCellType() == HSSFCell.CELL_TYPE_BLANK){
                        //当该单元格为空
                        colList.add("");
                        continue;
                    }
                    //根据单元格数据类型获取String值
                    switch(cell.getCellType()){
                     case XSSFCell.CELL_TYPE_STRING:  
                            value = cell.getStringCellValue();  
                            break;  
                        case XSSFCell.CELL_TYPE_NUMERIC:  
                            if ("@".equals(cell.getCellStyle().getDataFormatString())) {  
                                value = df.format(cell.getNumericCellValue());  
                            } else if ("General".equals(cell.getCellStyle()  
                                    .getDataFormatString())) {  
                                value = nf.format(cell.getNumericCellValue());  
                            } else {  
                                value = sdf.format(HSSFDateUtil.getJavaDate(cell  
                                        .getNumericCellValue()));  
                            }  
                            break;  
                        case XSSFCell.CELL_TYPE_BOOLEAN:  
                            value = Boolean.valueOf(cell.getBooleanCellValue());
                            break;  
                        case XSSFCell.CELL_TYPE_BLANK:  
                            value = "";  
                            break;  
                        default:  
                            value = cell.toString();  
                    }// end switch
                    colList.add(value);
                }//end for j
                rowList.add(colList);
            }//end for i

            return rowList;
        }catch(Exception e){
            return null;
        }
    }
    public static ArrayList<ArrayList<Object>> readExcel2007(File file){
        try{
            ArrayList<ArrayList<Object>> rowList = new ArrayList<ArrayList<Object>>();
            ArrayList<Object> colList;
            XSSFWorkbook wb = new XSSFWorkbook(new FileInputStream(file));
            XSSFSheet sheet = wb.getSheetAt(0);
            XSSFRow row;
            XSSFCell cell;
            Object value;
            for(int i =0 ; i < sheet.getLastRowNum(); i++ ){
                row = sheet.getRow(i);
                colList = new ArrayList<Object>();
                if(row == null){
                    rowList.add(colList);
                    continue;
                }
                for( int j = 0 ; j < row.getLastCellNum() ;j++){
                    cell = row.getCell(j);
                    if(cell == null || cell.getCellType() == HSSFCell.CELL_TYPE_BLANK){
                        colList.add("");
                        continue;
                    }
                    switch(cell.getCellType()){
                     case XSSFCell.CELL_TYPE_STRING:  
                            value = cell.getStringCellValue();  
                            break;  
                        case XSSFCell.CELL_TYPE_NUMERIC:  
                            if ("@".equals(cell.getCellStyle().getDataFormatString())) {  
                                value = df.format(cell.getNumericCellValue());  
                            } else if ("General".equals(cell.getCellStyle()  
                                    .getDataFormatString())) {  
                                value = nf.format(cell.getNumericCellValue());  
                            } else {  
                                value = sdf.format(HSSFDateUtil.getJavaDate(cell  
                                        .getNumericCellValue()));  
                            }  

                            break;  
                        case XSSFCell.CELL_TYPE_BOOLEAN:  
                            value = Boolean.valueOf(cell.getBooleanCellValue());
                            break;  
                        case XSSFCell.CELL_TYPE_BLANK:  
                            value = "";  
                            break;  
                        default:  
                            value = cell.toString();  
                    }// end switch
                    colList.add(value);
                }//end for j
                rowList.add(colList);
            }//end for i

            return rowList;
        }catch(Exception e){
            e.printStackTrace();
            return null;
        }
    }
    public static DecimalFormat getDf() {
        return df;
    }
    public static void setDf(DecimalFormat df) {
        CopyOfExcelUtil.df = df;
    }
    public static SimpleDateFormat getSdf() {
        return sdf;
    }
    public static void setSdf(SimpleDateFormat sdf) {
        CopyOfExcelUtil.sdf = sdf;
    }
    public static DecimalFormat getNf() {
        return nf;
    }
    public static void setNf(DecimalFormat nf) {
        CopyOfExcelUtil.nf = nf;
    }



}

使用方法：

        File file = new File(path); 
        ArrayList<ArrayList<Object>> result = ExcelUtil.readExcel(file);