Java写入写出Excel操作源码分享

这两天帮老师做一个数据库，将所有实验交易的数据导入到数据库中，但是不想天天在实验室里面待着，气氛太压抑，就想着先把数据读进EXCEL中，哪天带到实验室导进去

数据原来是这样的，不同的实验有一个专门的文件夹，实验名的文件夹下有不同班级的文件夹，班级文件夹下有该班级日期文件夹，存储的是不同时间下该班做实验的数据EXCEL，原来的EXCEL中没有班级和时间，现在需要通过读取EXCEL名以及班级名来将该信息作为一列，加入到EXCEL中。

下面是源代码，嘿嘿，顺便还做了一个可视化窗口。

类ExcelRead：

import java.awt.List;
import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.text.DecimalFormat;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
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;
public class ExcelRead {
    String path;
    public String getPath() {
        return path;
    }
    public void setPath(String path) {
        this.path = path;
    }
    //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{
            //处理ecxel2003
            return readExcel2003(file);
        }
    }
    /*
   * @return 将返回结果存储在ArrayList内，存储结构与二位数组类似
   * lists.get(0).get(0)表示过去Excel中0行0列单元格
   */
    public static ArrayList<ArrayList<Object>> readExcel2003(File file){
        try{
            ArrayList<ArrayList<Object>> rowList = new ArrayList<ArrayList<Object>>();
            ArrayList<Object> colList;
            HSSFWorkbook wb = new HSSFWorkbook(new FileInputStream(file));
            HSSFSheet sheet = wb.getSheetAt(0);
            HSSFRow row;
            HSSFCell cell;
            Object value;
            for (int i = sheet.getFirstRowNum() , rowCount = 0; rowCount < sheet.getPhysicalNumberOfRows() ; i++ ){
                row = sheet.getRow(i);
                colList = new ArrayList<Object>();
                if(row == null){
                    //当读取行为空时
                    if(i != sheet.getPhysicalNumberOfRows()){
                        //判断是否是最后一行
                        rowList.add(colList);
                    }
                    continue;
                } else{
                    rowCount++;
                }
                for ( int j = row.getFirstCellNum() ; j <= row.getLastCellNum() ;j++){
                    cell = row.getCell(j);
                    if(cell == null || cell.getCellType() == HSSFCell.CELL_TYPE_BLANK){
                        //当该单元格为空
                        if(j != row.getLastCellNum()){
                            //判断是否是该行中最后一个单元格
                            colList.add("");
                        }
                        continue;
                    }
                    switch(cell.getCellType()){
                        case XSSFCell.CELL_TYPE_STRING:
                                    //System.out.println(i + "行" + j + " 列 is String type");
                        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()));
                        }
                        //                System.out.println(i + "行" + j
                        //                    + " 列 is Number type ; DateFormt:"
                        //                    + value.toString());
                        break;
                        case XSSFCell.CELL_TYPE_BOOLEAN:
                                    //System.out.println(i + "行" + j + " 列 is Boolean type");
                        value = Boolean.valueOf(cell.getBooleanCellValue());
                        break;
                        case XSSFCell.CELL_TYPE_BLANK:
                                    //System.out.println(i + "行" + j + " 列 is Blank type");
                        value = "";
                        break;
                        default:
                                    //System.out.println(i + "行" + j + " 列 is default type");
                        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 = sheet.getFirstRowNum() , rowCount = 0; rowCount < sheet.getPhysicalNumberOfRows() ; i++ ){
                row = sheet.getRow(i);
                colList = new ArrayList<Object>();
                if(row == null){
                    //当读取行为空时
                    if(i != sheet.getPhysicalNumberOfRows()){
                        //判断是否是最后一行
                        rowList.add(colList);
                    }
                    continue;
                } else{
                    rowCount++;
                }
                for ( int j = row.getFirstCellNum() ; j <= row.getLastCellNum() ;j++){
                    cell = row.getCell(j);
                    if(cell == null || cell.getCellType() == HSSFCell.CELL_TYPE_BLANK){
                        //当该单元格为空
                        if(j != row.getLastCellNum()){
                            //判断是否是该行中最后一个单元格
                            colList.add("");
                        }
                        continue;
                    }
                    switch(cell.getCellType()){
                        case XSSFCell.CELL_TYPE_STRING:
                                    //System.out.println(i + "行" + j + " 列 is String type");
                        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()));
                        }
                        //                System.out.println(i + "行" + j
                        //                    + " 列 is Number type ; DateFormt:"
                        //                    + value.toString());
                        break;
                        case XSSFCell.CELL_TYPE_BOOLEAN:
                                    //System.out.println(i + "行" + j + " 列 is Boolean type");
                        value = Boolean.valueOf(cell.getBooleanCellValue());
                        break;
                        case XSSFCell.CELL_TYPE_BLANK:
                                    //System.out.println(i + "行" + j + " 列 is Blank type");
                        value = "";
                        break;
                        default:
                                    //System.out.println(i + "行" + j + " 列 is default type");
                        value = cell.toString();
                    }
                    // end switch
                    colList.add(value);
                }
                //end for j
                rowList.add(colList);
            }
            //end for i
            return rowList;
        }
        catch(Exception e){
            System.out.println("exception");
            return null;
        }
    }
    public static ArrayList getFiles(String filePath){
        File root = new File(filePath);
        File[]files = root.listFiles();
        ArrayList filelist = new ArrayList();
        for (File file:files){
            if(file.isDirectory()){
                filelist.addAll(getFiles(file.getAbsolutePath()));
            } else{
                String newpath = file.getAbsolutePath();
                if(newpath.contains("交易记录")){
                    filelist.add(newpath);
                }
            }
        }
        return filelist;
    }
    public void readBook(String path3) {
        String filePath = path3;
        ArrayList filelist = getFiles(filePath);
        ArrayList<ArrayList>resultAll = new ArrayList<ArrayList>();
        for (int i = 0;i<filelist.size();i++){
            String path = (String) filelist.get(i);
            System.out.println(path);
            ArrayList<ArrayList>result = Graph(path);
            String[] path2 = path.split("\\\\");
            int num = result.get(0).size();
            ArrayList result2 = new ArrayList();
            for (int j = 0;j<num;j++){
                result2.add(path2[path2.length-2]);
            }
            ArrayList result3 = new ArrayList();
            for (int j = 0;j<num;j++){
                result3.add(path2[path2.length-3]);
            }
            result.add(result2);
            result.add(result3);
            if(resultAll.size()==0){
                resultAll = result;
            } else{
                for (int j = 0;j<result.size();j++){
                    for (int k = 0;k<result.get(j).size();k++){
                        resultAll.get(j).add(result.get(j).get(k));
                    }
                }
            }
        }
        writeExcel(resultAll,"D:/a.xls");
    }
    public static void writeExcel(ArrayList<ArrayList> result,String path){
        if(result == null){
            return;
        }
        HSSFWorkbook wb = new HSSFWorkbook();
        HSSFSheet sheet = wb.createSheet("sheet1");
        for (int i = 0 ;i < result.get(0).size() ; i++){
            HSSFRow row = sheet.createRow(i);
            for (int j = 0; j < result.size() ; j ++){
                HSSFCell cell = row.createCell((short)j);
                cell.setCellValue(result.get(j).get(i).toString());
            }
        }
        ByteArrayOutputStream os = new ByteArrayOutputStream();
        try
            {
            wb.write(os);
        }
        catch (IOException e){
            e.printStackTrace();
        }
        byte[] content = os.toByteArray();
        File file = new File(path);
        //Excel文件生成后存储的位置。
        OutputStream fos = null;
        try
            {
            fos = new FileOutputStream(file);
            wb.write(fos);
            os.close();
            fos.close();
        }
        catch (Exception e){
            e.printStackTrace();
        }
    }
    public static DecimalFormat getDf() {
        return df;
    }
    public static void setDf(DecimalFormat df) {
        ExcelRead.df = df;
    }
    public static SimpleDateFormat getSdf() {
        return sdf;
    }
    public static void setSdf(SimpleDateFormat sdf) {
        ExcelRead.sdf = sdf;
    }
    public static DecimalFormat getNf() {
        return nf;
    }
    public static void setNf(DecimalFormat nf) {
        ExcelRead.nf = nf;
    }
    public static ArrayList<ArrayList> Graph(String path){
        File file = new File(path);
        ArrayList<ArrayList<Object>> result = ExcelRead.readExcel(file);
        ArrayList<double>price = new ArrayList<double>();
        //价格序列
        ArrayList<String>time = new ArrayList<String>();
        //时间序列
        ArrayList<String>buyList = new ArrayList<String>();
        //买方序列
        ArrayList<String>sellList = new ArrayList<String>();
        //卖方序列
        ArrayList<double>vol = new ArrayList<double>();
        //成交量
        ArrayList<String>Share = new ArrayList<String>();
        //股票名字
        ArrayList<String>id = new ArrayList<String>();
        ArrayList<String>Shareid = new ArrayList<String>();
        for (int i = 2 ;i < result.size() ;i++){
            for (int j = 0;j<result.get(i).size(); j++){
                //第5列表示价格，第8列表示时间
                if(j==0){
                    String temp = (String) result.get(i).get(j);
                    id.add(temp);
                }
                if(j==3){
                    String temp = (String) result.get(i).get(j);
                    Shareid.add(temp);
                }
                if(j==5){
                    //price.add((String) result.get(i).get(j));
                    String temp = (String) result.get(i).get(j);
                    String[] units = temp.split("￥");
                    price.add(double.valueOf(units[1]));
                }
                if(j==7){
                    String temp = (String) result.get(i).get(j);
                    time.add(temp);
                    //         time.add((String) result.get(i).get(j));
                }
                if(j==1){
                    buyList.add((String) result.get(i).get(j));
                }
                if(j==2){
                    sellList.add((String) result.get(i).get(j));
                }
                if(j==6){
                    vol.add(double.valueOf((String)result.get(i).get(j)));
                }
                if(j==4){
                    Share.add((String)result.get(i).get(j));
                }
            }
        }
        ArrayList<ArrayList>resultList = new ArrayList<ArrayList>();
        resultList.add(Shareid);
        resultList.add(id);
        resultList.add(buyList);
        resultList.add(sellList);
        resultList.add(Share);
        resultList.add(price);
        resultList.add(vol);
        resultList.add(time);
        return resultList;
    }
}

readExcelBook（做可视化窗口的）：

import java.awt.EventQueue;
import javax.swing.JFileChooser;
import javax.swing.JFrame;
import javax.swing.GroupLayout;
import javax.swing.JLabel;
import javax.swing.GroupLayout.Alignment;
import javax.swing.JButton;
import javax.swing.JTextField;
import java.awt.event.ActionListener;
import java.awt.event.ActionEvent;
import java.io.File;
public class readExcelBook {
    private JFrame frame;
    private JTextField textField;
    /**
   * Launch the application.
   */
    public static void main(String[] args) {
        EventQueue.invokeLater(new Runnable() {
            public void run() {
                try {
                    readExcelBook window = new readExcelBook();
                    window.frame.setVisible(true);
                }
                catch (Exception e) {
                    e.printStackTrace();
                }
            }
        }
        );
    }
    /**
   * Create the application.
   */
    public readExcelBook() {
        initialize();
    }
    /**
   * Initialize the contents of the frame.
   */
    private void initialize() {
        frame = new JFrame();
        frame.setBounds(100, 100, 450, 300);
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        JButton button = new JButton("\u9009\u62E9\u6587\u4EF6");
        button.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                JFileChooser jfc=new JFileChooser();
                jfc.setFileSelectionMode(JFileChooser.FILES_AND_DIRECTORIES );
                jfc.showDialog(new JLabel(), "选择");
                File file=jfc.getSelectedFile();
                String path = file.getAbsolutePath();
                textField.setText(path);
                ExcelRead er = new ExcelRead();
                er.readBook(path);
            }
        }
        );
        textField = new JTextField();
        textField.setColumns(10);
        JLabel lbldaxls = new JLabel("\u5199\u5165\u4E86D\u76D8\u4E0B\u7684a.xls\u54C8");
        GroupLayout groupLayout = new GroupLayout(frame.getContentPane());
        groupLayout.setHorizontalGroup(
              groupLayout.createParallelGroup(Alignment.LEADING)
                .addGroup(groupLayout.createSequentialGroup()
                  .addGap(26)
                  .addGroup(groupLayout.createParallelGroup(Alignment.LEADING)
                    .addComponent(lbldaxls)
                    .addComponent(textField, GroupLayout.PREFERRED_SIZE, 295, GroupLayout.PREFERRED_SIZE)
                    .addComponent(button))
                  .addContainerGap(113, short.MAX_VALUE))
            );
        groupLayout.setVerticalGroup(
              groupLayout.createParallelGroup(Alignment.LEADING)
                .addGroup(groupLayout.createSequentialGroup()
                  .addGap(31)
                  .addComponent(button)
                  .addGap(18)
                  .addComponent(textField, GroupLayout.PREFERRED_SIZE, GroupLayout.DEFAULT_SIZE, GroupLayout.PREFERRED_SIZE)
                  .addGap(35)
                  .addComponent(lbldaxls)
                  .addContainerGap(119, short.MAX_VALUE))
            );
        frame.getContentPane().setLayout(groupLayout);
    }
}

运行结果：

总结

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原文链接：http://www.cnblogs.com/yunerlalala/p/6249947.html