Java写入写出Excel操作源码分享

 更新时间:2017年12月15日 15:37:57   转载 作者:薄樱  
这篇文章主要介绍了Java写入写出Excel操作源码分享,具有一定借鉴价值,需要的朋友可以参考下。

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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