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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