- 浏览: 285593 次
- 性别:
- 来自: 哈尔滨
文章分类
最新评论
-
netfengxia:
这个是Mybatis哦. 是一个ORM框架, 这里展示的是My ...
mybatis merge 语句使用 -
MILLETS:
好像没有效果
jsp页面打印、预览、设置实现方案 -
evic520:
mysql有merge into的用法?是不是标题错了 楼主? ...
mybatis merge 语句使用 -
winner_king:
解决问题
pager-taglib分页中文乱码问题 -
Renee涟漪:
...
SVN搭建
现在的任务就是把客户数据迁移到数据库中,由于客户提供的数据都存储在excel中,有些文件数据量还很大,在 usermodel模式下经常内存溢出,于是只能采用直接通过pl/sql往数据库复制或是用eventusermodel模式读取。直接复制倒是简单,但是速度太慢,一次复制的太多也会内存溢出。
usermodel模式对excel操作前需要将文件全部转入内存,对较大文件来说内存开销很大。但是其使用简单。
eventusermodel模式采用事件模型,对文件边读取边处理,内存消耗较低,效率高,因为不用等待文件全部装入内存。但使用较复杂。
excel读取采用的API为POI3.6,使用前先下载此包,若运行中出现其他依赖包不存在,请下载相应依赖包。
下面展示的是excel2003及其之前版本的大文件读取方法。
抽象类 HxlsAbstract:
- package com.gaosheng.util.xls;
- import java.io.FileInputStream;
- import java.io.FileNotFoundException;
- import java.io.IOException;
- import java.io.PrintStream;
- import java.sql.SQLException;
- import java.util.ArrayList;
- import java.util.List;
- import org.apache.poi.hssf.eventusermodel.FormatTrackingHSSFListener;
- import org.apache.poi.hssf.eventusermodel.HSSFEventFactory;
- import org.apache.poi.hssf.eventusermodel.HSSFListener;
- import org.apache.poi.hssf.eventusermodel.HSSFRequest;
- import org.apache.poi.hssf.eventusermodel.MissingRecordAwareHSSFListener;
- import org.apache.poi.hssf.eventusermodel.EventWorkbookBuilder.SheetRecordCollectingListener;
- import org.apache.poi.hssf.eventusermodel.dummyrecord.LastCellOfRowDummyRecord;
- import org.apache.poi.hssf.eventusermodel.dummyrecord.MissingCellDummyRecord;
- import org.apache.poi.hssf.model.HSSFFormulaParser;
- import org.apache.poi.hssf.record.BOFRecord;
- import org.apache.poi.hssf.record.BlankRecord;
- import org.apache.poi.hssf.record.BoolErrRecord;
- import org.apache.poi.hssf.record.BoundSheetRecord;
- import org.apache.poi.hssf.record.FormulaRecord;
- import org.apache.poi.hssf.record.LabelRecord;
- import org.apache.poi.hssf.record.LabelSSTRecord;
- import org.apache.poi.hssf.record.NoteRecord;
- import org.apache.poi.hssf.record.NumberRecord;
- import org.apache.poi.hssf.record.RKRecord;
- import org.apache.poi.hssf.record.Record;
- import org.apache.poi.hssf.record.SSTRecord;
- import org.apache.poi.hssf.record.StringRecord;
- import org.apache.poi.hssf.usermodel.HSSFWorkbook;
- import org.apache.poi.poifs.filesystem.POIFSFileSystem;
- public abstract class HxlsAbstract implements HSSFListener {
- private int minColumns;
- private POIFSFileSystem fs;
- private PrintStream output;
- private int lastRowNumber;
- private int lastColumnNumber;
- /** Should we output the formula, or the value it has? */
- private boolean outputFormulaValues = true;
- /** For parsing Formulas */
- private SheetRecordCollectingListener workbookBuildingListener;
- private HSSFWorkbook stubWorkbook;
- // Records we pick up as we process
- private SSTRecord sstRecord;
- private FormatTrackingHSSFListener formatListener;
- /** So we known which sheet we're on */
- private int sheetIndex = -1;
- private BoundSheetRecord[] orderedBSRs;
- @SuppressWarnings("unchecked")
- private ArrayList boundSheetRecords = new ArrayList();
- // For handling formulas with string results
- private int nextRow;
- private int nextColumn;
- private boolean outputNextStringRecord;
- private int curRow;
- private List<String> rowlist;
- @SuppressWarnings( "unused")
- private String sheetName;
- public HxlsAbstract(POIFSFileSystem fs)
- throws SQLException {
- this.fs = fs;
- this.output = System.out;
- this.minColumns = -1;
- this.curRow = 0;
- this.rowlist = new ArrayList<String>();
- }
- public HxlsAbstract(String filename) throws IOException,
- FileNotFoundException, SQLException {
- this(new POIFSFileSystem(new FileInputStream(filename)));
- }
- //excel记录行操作方法,以行索引和行元素列表为参数,对一行元素进行操作,元素为String类型
- // public abstract void optRows(int curRow, List<String> rowlist) throws SQLException ;
- //excel记录行操作方法,以sheet索引,行索引和行元素列表为参数,对sheet的一行元素进行操作,元素为String类型
- public abstract void optRows(int sheetIndex,int curRow, List<String> rowlist) throws SQLException;
- /**
- * 遍历 excel 文件
- */
- public void process() throws IOException {
- MissingRecordAwareHSSFListener listener = new MissingRecordAwareHSSFListener(
- this);
- formatListener = new FormatTrackingHSSFListener(listener);
- HSSFEventFactory factory = new HSSFEventFactory();
- HSSFRequest request = new HSSFRequest();
- if (outputFormulaValues) {
- request.addListenerForAllRecords(formatListener);
- } else {
- workbookBuildingListener = new SheetRecordCollectingListener(
- formatListener);
- request.addListenerForAllRecords(workbookBuildingListener);
- }
- factory.processWorkbookEvents(request, fs);
- }
- /**
- * HSSFListener 监听方法,处理 Record
- */
- @SuppressWarnings("unchecked")
- public void processRecord(Record record) {
- int thisRow = -1;
- int thisColumn = -1;
- String thisStr = null;
- String value = null;
- switch (record.getSid()) {
- case BoundSheetRecord.sid:
- boundSheetRecords.add(record);
- break;
- case BOFRecord.sid:
- BOFRecord br = (BOFRecord) record;
- if (br.getType() == BOFRecord.TYPE_WORKSHEET) {
- // Create sub workbook if required
- if (workbookBuildingListener != null && stubWorkbook == null) {
- stubWorkbook = workbookBuildingListener
- .getStubHSSFWorkbook();
- }
- // Works by ordering the BSRs by the location of
- // their BOFRecords, and then knowing that we
- // process BOFRecords in byte offset order
- sheetIndex++;
- if (orderedBSRs == null) {
- orderedBSRs = BoundSheetRecord
- .orderByBofPosition(boundSheetRecords);
- }
- sheetName = orderedBSRs[sheetIndex].getSheetname();
- }
- break;
- case SSTRecord.sid:
- sstRecord = (SSTRecord) record;
- break;
- case BlankRecord.sid:
- BlankRecord brec = (BlankRecord) record;
- thisRow = brec.getRow();
- thisColumn = brec.getColumn();
- thisStr = "";
- break;
- case BoolErrRecord.sid:
- BoolErrRecord berec = (BoolErrRecord) record;
- thisRow = berec.getRow();
- thisColumn = berec.getColumn();
- thisStr = "";
- break;
- case FormulaRecord.sid:
- FormulaRecord frec = (FormulaRecord) record;
- thisRow = frec.getRow();
- thisColumn = frec.getColumn();
- if (outputFormulaValues) {
- if (Double.isNaN(frec.getValue())) {
- // Formula result is a string
- // This is stored in the next record
- outputNextStringRecord = true;
- nextRow = frec.getRow();
- nextColumn = frec.getColumn();
- } else {
- thisStr = formatListener.formatNumberDateCell(frec);
- }
- } else {
- thisStr = '"' + HSSFFormulaParser.toFormulaString(stubWorkbook,
- frec.getParsedExpression()) + '"';
- }
- break;
- case StringRecord.sid:
- if (outputNextStringRecord) {
- // String for formula
- StringRecord srec = (StringRecord) record;
- thisStr = srec.getString();
- thisRow = nextRow;
- thisColumn = nextColumn;
- outputNextStringRecord = false;
- }
- break;
- case LabelRecord.sid:
- LabelRecord lrec = (LabelRecord) record;
- curRow = thisRow = lrec.getRow();
- thisColumn = lrec.getColumn();
- value = lrec.getValue().trim();
- value = value.equals("")?" ":value;
- this.rowlist.add(thisColumn, value);
- break;
- case LabelSSTRecord.sid:
- LabelSSTRecord lsrec = (LabelSSTRecord) record;
- curRow = thisRow = lsrec.getRow();
- thisColumn = lsrec.getColumn();
- if (sstRecord == null) {
- rowlist.add(thisColumn, " ");
- } else {
- value = sstRecord
- .getString(lsrec.getSSTIndex()).toString().trim();
- value = value.equals("")?" ":value;
- rowlist.add(thisColumn,value);
- }
- break;
- case NoteRecord.sid:
- NoteRecord nrec = (NoteRecord) record;
- thisRow = nrec.getRow();
- thisColumn = nrec.getColumn();
- // TODO: Find object to match nrec.getShapeId()
- thisStr = '"' + "(TODO)" + '"';
- break;
- case NumberRecord.sid:
- NumberRecord numrec = (NumberRecord) record;
- curRow = thisRow = numrec.getRow();
- thisColumn = numrec.getColumn();
- value = formatListener.formatNumberDateCell(numrec).trim();
- value = value.equals("")?" ":value;
- // Format
- rowlist.add(thisColumn, value);
- break;
- case RKRecord.sid:
- RKRecord rkrec = (RKRecord) record;
- thisRow = rkrec.getRow();
- thisColumn = rkrec.getColumn();
- thisStr = '"' + "(TODO)" + '"';
- break;
- default:
- break;
- }
- // 遇到新行的操作
- if (thisRow != -1 && thisRow != lastRowNumber) {
- lastColumnNumber = -1;
- }
- // 空值的操作
- if (record instanceof MissingCellDummyRecord) {
- MissingCellDummyRecord mc = (MissingCellDummyRecord) record;
- curRow = thisRow = mc.getRow();
- thisColumn = mc.getColumn();
- rowlist.add(thisColumn," ");
- }
- // 如果遇到能打印的东西,在这里打印
- if (thisStr != null) {
- if (thisColumn > 0) {
- output.print(',');
- }
- output.print(thisStr);
- }
- // 更新行和列的值
- if (thisRow > -1)
- lastRowNumber = thisRow;
- if (thisColumn > -1)
- lastColumnNumber = thisColumn;
- // 行结束时的操作
- if (record instanceof LastCellOfRowDummyRecord) {
- if (minColumns > 0) {
- // 列值重新置空
- if (lastColumnNumber == -1) {
- lastColumnNumber = 0;
- }
- }
- // 行结束时, 调用 optRows() 方法
- lastColumnNumber = -1;
- try {
- optRows(sheetIndex,curRow, rowlist);
- } catch (SQLException e) {
- e.printStackTrace();
- }
- rowlist.clear();
- }
- }
- }
package com.gaosheng.util.xls; import java.io.FileInputStream; import java.io.FileNotFoundException; import java.io.IOException; import java.io.PrintStream; import java.sql.SQLException; import java.util.ArrayList; import java.util.List; import org.apache.poi.hssf.eventusermodel.FormatTrackingHSSFListener; import org.apache.poi.hssf.eventusermodel.HSSFEventFactory; import org.apache.poi.hssf.eventusermodel.HSSFListener; import org.apache.poi.hssf.eventusermodel.HSSFRequest; import org.apache.poi.hssf.eventusermodel.MissingRecordAwareHSSFListener; import org.apache.poi.hssf.eventusermodel.EventWorkbookBuilder.SheetRecordCollectingListener; import org.apache.poi.hssf.eventusermodel.dummyrecord.LastCellOfRowDummyRecord; import org.apache.poi.hssf.eventusermodel.dummyrecord.MissingCellDummyRecord; import org.apache.poi.hssf.model.HSSFFormulaParser; import org.apache.poi.hssf.record.BOFRecord; import org.apache.poi.hssf.record.BlankRecord; import org.apache.poi.hssf.record.BoolErrRecord; import org.apache.poi.hssf.record.BoundSheetRecord; import org.apache.poi.hssf.record.FormulaRecord; import org.apache.poi.hssf.record.LabelRecord; import org.apache.poi.hssf.record.LabelSSTRecord; import org.apache.poi.hssf.record.NoteRecord; import org.apache.poi.hssf.record.NumberRecord; import org.apache.poi.hssf.record.RKRecord; import org.apache.poi.hssf.record.Record; import org.apache.poi.hssf.record.SSTRecord; import org.apache.poi.hssf.record.StringRecord; import org.apache.poi.hssf.usermodel.HSSFWorkbook; import org.apache.poi.poifs.filesystem.POIFSFileSystem; public abstract class HxlsAbstract implements HSSFListener { private int minColumns; private POIFSFileSystem fs; private PrintStream output; private int lastRowNumber; private int lastColumnNumber; /** Should we output the formula, or the value it has? */ private boolean outputFormulaValues = true; /** For parsing Formulas */ private SheetRecordCollectingListener workbookBuildingListener; private HSSFWorkbook stubWorkbook; // Records we pick up as we process private SSTRecord sstRecord; private FormatTrackingHSSFListener formatListener; /** So we known which sheet we're on */ private int sheetIndex = -1; private BoundSheetRecord[] orderedBSRs; @SuppressWarnings("unchecked") private ArrayList boundSheetRecords = new ArrayList(); // For handling formulas with string results private int nextRow; private int nextColumn; private boolean outputNextStringRecord; private int curRow; private List<String> rowlist; @SuppressWarnings( "unused") private String sheetName; public HxlsAbstract(POIFSFileSystem fs) throws SQLException { this.fs = fs; this.output = System.out; this.minColumns = -1; this.curRow = 0; this.rowlist = new ArrayList<String>(); } public HxlsAbstract(String filename) throws IOException, FileNotFoundException, SQLException { this(new POIFSFileSystem(new FileInputStream(filename))); } //excel记录行操作方法,以行索引和行元素列表为参数,对一行元素进行操作,元素为String类型 // public abstract void optRows(int curRow, List<String> rowlist) throws SQLException ; //excel记录行操作方法,以sheet索引,行索引和行元素列表为参数,对sheet的一行元素进行操作,元素为String类型 public abstract void optRows(int sheetIndex,int curRow, List<String> rowlist) throws SQLException; /** * 遍历 excel 文件 */ public void process() throws IOException { MissingRecordAwareHSSFListener listener = new MissingRecordAwareHSSFListener( this); formatListener = new FormatTrackingHSSFListener(listener); HSSFEventFactory factory = new HSSFEventFactory(); HSSFRequest request = new HSSFRequest(); if (outputFormulaValues) { request.addListenerForAllRecords(formatListener); } else { workbookBuildingListener = new SheetRecordCollectingListener( formatListener); request.addListenerForAllRecords(workbookBuildingListener); } factory.processWorkbookEvents(request, fs); } /** * HSSFListener 监听方法,处理 Record */ @SuppressWarnings("unchecked") public void processRecord(Record record) { int thisRow = -1; int thisColumn = -1; String thisStr = null; String value = null; switch (record.getSid()) { case BoundSheetRecord.sid: boundSheetRecords.add(record); break; case BOFRecord.sid: BOFRecord br = (BOFRecord) record; if (br.getType() == BOFRecord.TYPE_WORKSHEET) { // Create sub workbook if required if (workbookBuildingListener != null && stubWorkbook == null) { stubWorkbook = workbookBuildingListener .getStubHSSFWorkbook(); } // Works by ordering the BSRs by the location of // their BOFRecords, and then knowing that we // process BOFRecords in byte offset order sheetIndex++; if (orderedBSRs == null) { orderedBSRs = BoundSheetRecord .orderByBofPosition(boundSheetRecords); } sheetName = orderedBSRs[sheetIndex].getSheetname(); } break; case SSTRecord.sid: sstRecord = (SSTRecord) record; break; case BlankRecord.sid: BlankRecord brec = (BlankRecord) record; thisRow = brec.getRow(); thisColumn = brec.getColumn(); thisStr = ""; break; case BoolErrRecord.sid: BoolErrRecord berec = (BoolErrRecord) record; thisRow = berec.getRow(); thisColumn = berec.getColumn(); thisStr = ""; break; case FormulaRecord.sid: FormulaRecord frec = (FormulaRecord) record; thisRow = frec.getRow(); thisColumn = frec.getColumn(); if (outputFormulaValues) { if (Double.isNaN(frec.getValue())) { // Formula result is a string // This is stored in the next record outputNextStringRecord = true; nextRow = frec.getRow(); nextColumn = frec.getColumn(); } else { thisStr = formatListener.formatNumberDateCell(frec); } } else { thisStr = '"' + HSSFFormulaParser.toFormulaString(stubWorkbook, frec.getParsedExpression()) + '"'; } break; case StringRecord.sid: if (outputNextStringRecord) { // String for formula StringRecord srec = (StringRecord) record; thisStr = srec.getString(); thisRow = nextRow; thisColumn = nextColumn; outputNextStringRecord = false; } break; case LabelRecord.sid: LabelRecord lrec = (LabelRecord) record; curRow = thisRow = lrec.getRow(); thisColumn = lrec.getColumn(); value = lrec.getValue().trim(); value = value.equals("")?" ":value; this.rowlist.add(thisColumn, value); break; case LabelSSTRecord.sid: LabelSSTRecord lsrec = (LabelSSTRecord) record; curRow = thisRow = lsrec.getRow(); thisColumn = lsrec.getColumn(); if (sstRecord == null) { rowlist.add(thisColumn, " "); } else { value = sstRecord .getString(lsrec.getSSTIndex()).toString().trim(); value = value.equals("")?" ":value; rowlist.add(thisColumn,value); } break; case NoteRecord.sid: NoteRecord nrec = (NoteRecord) record; thisRow = nrec.getRow(); thisColumn = nrec.getColumn(); // TODO: Find object to match nrec.getShapeId() thisStr = '"' + "(TODO)" + '"'; break; case NumberRecord.sid: NumberRecord numrec = (NumberRecord) record; curRow = thisRow = numrec.getRow(); thisColumn = numrec.getColumn(); value = formatListener.formatNumberDateCell(numrec).trim(); value = value.equals("")?" ":value; // Format rowlist.add(thisColumn, value); break; case RKRecord.sid: RKRecord rkrec = (RKRecord) record; thisRow = rkrec.getRow(); thisColumn = rkrec.getColumn(); thisStr = '"' + "(TODO)" + '"'; break; default: break; } // 遇到新行的操作 if (thisRow != -1 && thisRow != lastRowNumber) { lastColumnNumber = -1; } // 空值的操作 if (record instanceof MissingCellDummyRecord) { MissingCellDummyRecord mc = (MissingCellDummyRecord) record; curRow = thisRow = mc.getRow(); thisColumn = mc.getColumn(); rowlist.add(thisColumn," "); } // 如果遇到能打印的东西,在这里打印 if (thisStr != null) { if (thisColumn > 0) { output.print(','); } output.print(thisStr); } // 更新行和列的值 if (thisRow > -1) lastRowNumber = thisRow; if (thisColumn > -1) lastColumnNumber = thisColumn; // 行结束时的操作 if (record instanceof LastCellOfRowDummyRecord) { if (minColumns > 0) { // 列值重新置空 if (lastColumnNumber == -1) { lastColumnNumber = 0; } } // 行结束时, 调用 optRows() 方法 lastColumnNumber = -1; try { optRows(sheetIndex,curRow, rowlist); } catch (SQLException e) { e.printStackTrace(); } rowlist.clear(); } } }
继承类: HxlsBig,作用:将excel中数据转储到数据库临时表中,实现optRows方法
- package com.gaosheng.util.examples.xls;
- import java.io.FileInputStream;
- import java.io.FileNotFoundException;
- import java.io.IOException;
- import java.io.PrintStream;
- import java.sql.Connection;
- import java.sql.DriverManager;
- import java.sql.PreparedStatement;
- import java.sql.SQLException;
- import java.sql.Statement;
- import java.util.List;
- import java.util.Properties;
- import org.apache.poi.poifs.filesystem.POIFSFileSystem;
- import com.gaosheng.util.xls.HxlsAbstract;
- public class HxlsBig extends HxlsAbstract{
- public static void main(String[] args) throws Exception {
- // XLS2CSVmra xls2csv = new XLS2CSVmra(args[0], minColumns);
- HxlsBig xls2csv = new HxlsBig("E:/up.xls","hxls_temp");
- xls2csv.process();
- xls2csv.close();
- }
- public HxlsBig(POIFSFileSystem fs, PrintStream output,String tableName)
- throws SQLException {
- super(fs);
- this.conn = getNew_Conn();
- this.statement = conn.createStatement();
- this.tableName = tableName;
- }
- public HxlsBig(String filename,String tableName) throws IOException,
- FileNotFoundException, SQLException {
- this(new POIFSFileSystem(new FileInputStream(filename)), System.out,tableName);
- }
- private Connection conn = null;
- private Statement statement = null;
- private PreparedStatement newStatement = null;
- private String tableName = "temp_table";
- private boolean create = true;
- // private int sheetIndex = 0;
- public void optRows(int sheetIndex,int curRow, List<String> rowlist) throws SQLException {
- if (curRow == 0 && sheetIndex == 0 ) {
- StringBuffer preSql = new StringBuffer("insert into " + tableName
- + " values(");
- StringBuffer table = new StringBuffer("create table " + tableName
- + "(");
- int c = rowlist.size();
- for (int i = 0; i < c; i++) {
- preSql.append("?,");
- table.append(rowlist.get(i));
- table.append(" varchar2(100) ,");
- }
- table.deleteCharAt(table.length() - 1);
- preSql.deleteCharAt(preSql.length() - 1);
- table.append(")");
- preSql.append(")");
- if (create) {
- statement = conn.createStatement();
- try{
- statement.execute("drop table "+tableName);
- }catch(Exception e){
- }finally{
- System.out.println("表 "+tableName+" 删除成功");
- }
- src.zip (11.2 KB)
- 下载次数: 20
发表评论
-
java 实现指定日期添加天数(转)
2012-11-29 10:56 3556public static void main(String[ ... -
java根据文件路径获取文件名
2012-05-22 11:25 1354//获取文件名 String temp[] = use ... -
pager-taglib分页中文乱码问题
2012-02-13 11:32 3957问题:整个项目是struts2+spring,页面编码格式ut ... -
泛域名解析
2012-01-30 11:15 1198web.xml配置 <!-- webSite d ... -
java路径问题总结
2011-11-07 15:43 854平时写程序的时候,很多时候提示文件找不到,而抛出了异常,现在整 ... -
ParameterBlockJAI获取远端服务器图片尺寸
2011-11-07 14:03 1343public static String getPicSiz ... -
PlanarImage获取图片尺寸
2011-11-07 11:06 1109PlanarImage src = JAI.create(&q ... -
request获取页面checkbox(复选框)值
2011-04-01 11:35 2477String[] powerStr=request.ge ... -
读取txt、csv文件格式实例
2011-01-06 11:28 16131、TaoCanXinXiImportAction.java ... -
大数据量的excel读取poi实际应用
2011-01-06 11:21 33221、HxlsAbstract.java import ... -
JFreeChart饼图、柱状图等
2010-12-21 10:25 848见附件文档 -
SimpleDateFormat使用
2010-12-02 11:18 1018import java.util.Date; import ... -
(转)java 常用工具包
2010-11-19 16:31 894java 常用工具包 -
(转)native2ascii转换中文properties文件
2010-11-18 14:41 1066问题描述: 在property文件中的中文,如果不经过enco ... -
java读取配置文件的几种方法(转载)
2010-11-09 16:04 896在现实工作中,我们常常需要保存一些系统配置信息,大家一般 ... -
系统定时任务--关于ant直接运行xxx.class
2010-11-04 14:59 25481、准备好你自己编写的java项目,已经生成class的。 ... -
file应用-按指定编码格式生成指定格式文件
2010-11-04 10:05 2514最近在开发一个,系统自动上传对账文件功能,由于里面用到一些fi ... -
数字转换字符串或者字符串不足长度补零
2010-11-03 15:16 1422package net.hlj.integralshop.ut ... -
java日期处理
2010-11-03 14:32 1241有关日期工具类(extends TimeUtil) Time ... -
(转载)数据导出到execl (一键下载式)
2010-11-01 16:16 1439给出了完整的代码示例: 使用了java反射,对数据进行处 ...
相关推荐
这个名为"安卓Android源码——安卓读取Excel文件获取表格数据.rar"的压缩包文件,很可能包含了一个示例项目,教你如何在Android应用中实现这一功能。 首先,让我们了解在Android中读取Excel文件的基本步骤。Android...
本项目“安卓Android源码——安卓读取Excel文件获取表格数据”提供了一个示例,展示了如何在Android应用中实现这一功能。下面将详细探讨相关知识点。 1. **Excel文件格式** Excel文件通常以`.xls`或`.xlsx`为扩展...
此外,考虑到性能和内存消耗,可能需要对大数据量的Excel文件进行分页处理,而不是一次性加载所有数据。 这个压缩包中的“cf_shuangSeQiu”文件可能是源码的一部分,但具体细节无法在此处分析,因为它不是一个明确...
**C++读写Excel文件——使用OpenXLSX库** 在C++编程中,处理Excel文件通常是数据分析、报告生成或数据存储的重要环节。OpenXLSX是一个轻量级且高效的开源库,它允许开发者在C++环境中方便地读取、写入、创建和修改....
在Android平台上,读取Excel文件是一项常见的需求,例如在数据导入、数据分析或报表展示等场景。本项目将探讨如何在Android Studio开发环境中实现这一功能。首先,我们需要了解Android对文件操作的基本方法,以及...
总的来说,C#中导入Excel读取图片的方法主要分为使用.NET Interop组件和第三方库如EPPlus。选择哪种方法取决于项目需求,如性能、兼容性、是否依赖Office等因素。对于图片上传,通常还会涉及文件流处理、网络传输等...
以下是一段典型的WinRunner脚本代码示例,用于读取指定的Excel文件中的“name”和“pwd”两列数据: ```plaintext table = "C:\\default.xls"; public function get_field_value(in table, in fieldname) { auto ...
在本案例中,我们讨论的是如何利用ODBC驱动来读取Excel文件,这在数据分析、报表生成或数据迁移等场景中非常常见。下面将详细讲解这一过程。 首先,我们需要了解ODBC的基本概念。ODBC是一个由Microsoft开发的数据...
由于大数据量可能导致内存溢出,我们可以分批写入数据,比如每次处理10000行: ```python def batch_insert(connection, df, table_name, chunksize=10000): for chunk in df.iterrows(chunksize=chunksize): ...
首先,要读取Excel文件,我们需要导入Python的一个第三方库——pandas。Pandas是Python中用于数据分析的核心库,提供了DataFrame对象,它是一个二维表格型数据结构,可以方便地进行数据清洗、转换和分析。 安装...
在这个"ASP.NET源码——Excel导入SQLserver源码.zip"的压缩包中,我们可以推测这是一份示例代码,用于演示如何在ASP.NET环境中读取Excel文件并将其数据导入到SQL Server数据库中。 首先,我们需要了解Excel文件的...
- `fmt`: 文件版本为`xlExcel8`,即Excel 97-2003版本。 ##### 3.2 读取数据——xlsread函数 **语法**: `[data, textdate] = xlsread(filename)` **输入参数**: - `filename`: 目标文件的路径或名称。 **输出...
`xlsx.js`是一个强大的库,专门用于处理Excel文件,它能够读取、写入和操作XLSX和XLSM文件格式,这两种都是Microsoft Excel广泛使用的二进制文件格式。通过这个库,开发者可以方便地创建工作表,设置单元格的值,...
1. **文件格式理解**:Excel 2007及以上版本主要使用两种文件格式——.xlsx(基于Open XML标准)和.xls(老式二进制格式)。.xlsx文件实际上是一系列XML文件的压缩包,包含了工作表、样式、公式等信息。因此,要读取...
这种技术允许开发者无需启动Excel应用,即可执行诸如打开文件、读取数据、修改内容、保存文件等操作。 2. **无需Excel支持的直接操作**:除了OLE自动化,Delphi还提供了一种更为高效的方法——直接操作Excel文件,...
Excel作为最广泛应用的工具之一,其文件格式分为多种,包括早期的Excel 2003 (.xls) 和稍后版本的Excel 2007及更高版本 (.xlsx)。对于这些文件的读写操作,通常需要借助特定的编程库或API来实现。在这个场景中,我们...
3. **生成和编辑Excel文件**:不仅可以从现有文件中读取数据,还支持创建新的Excel文件及修改已有的文件。 4. **丰富的格式化支持**:支持字体样式、数字格式、日期格式等多样化的格式化操作,同时支持单元格的阴影...