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Java写入写出Excel操作源码分享

转载 作者：qq735679552 更新时间：2022-09-27 22:32:09 26 4
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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:

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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）:

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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:

Java写入写出Excel操作源码分享

总结 。

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

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