java实现读写excel
package com.ninemax.utils;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.sql.Connection;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
import java.util.ArrayList;
import java.util.Date;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import org.apache.poi.hssf.usermodel.HSSFCell;
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.poifs.filesystem.POIFSFileSystem;
import com.ninemax.entity.ExcelVo;
import com.ninemax.test.DBCenter;
/**
* 操作Excel表格的功能类
* @author：Fuxing
* @version 1.0
*/
public class ExcelReader {
private POIFSFileSystem fs;
private HSSFWorkbook wb;
private HSSFSheet sheet;
private HSSFRow row;
/**
* 读取Excel表格表头的内容
* @param InputStream
* @return String 表头内容的数组
*
*/
public String[] readExcelTitle(InputStream is) {
try {
fs = new POIFSFileSystem(is);
wb = new HSSFWorkbook(fs);
} catch (IOException e) {
e.printStackTrace();
}
sheet = wb.getSheetAt(0);
row = sheet.getRow(0);
//标题总列数
int colNum = row.getPhysicalNumberOfCells();
String[] title = new String[colNum];
for (int i=0; i<colNum; i++) {
title[i] = getStringCellValue(row.getCell((short) i));
}
return title;
}
/**
* 读取Excel数据内容
* @param InputStream
* @return Map 包含单元格数据内容的Map对象
*/
public Map<Integer,String> readExcelContent(InputStream is) {
Map<Integer,String> content = new HashMap<Integer,String>();
String str = "";
try {
fs = new POIFSFileSystem(is);
wb = new HSSFWorkbook(fs);
} catch (IOException e) {
e.printStackTrace();
}
sheet = wb.getSheetAt(0);
//得到总行数
int rowNum = sheet.getLastRowNum();
row = sheet.getRow(0);
int colNum = row.getPhysicalNumberOfCells();
//正文内容应该从第二行开始,第一行为表头的标题
for (int i = 1; i <= rowNum; i++) {
row = sheet.getRow(i);
int j = 0;
while (j<colNum) {
//每个单元格的数据内容用"-"分割开，以后需要时用String类的replace()方法还原数据
//也可以将每个单元格的数据设置到一个javabean的属性中，此时需要新建一个javabean
str += getStringCellValue(row.getCell((short) j)).trim() + "-";
j ++;
}
content.put(i, str);
str = "";
}
return content;
}
/**
* 获取单元格数据内容为字符串类型的数据
* @param cell Excel单元格
* @return String 单元格数据内容
*/
private String getStringCellValue(HSSFCell cell) {
String strCell = "";
if(cell!=null){
switch (cell.getCellType()) {
case HSSFCell.CELL_TYPE_STRING:
strCell = cell.getStringCellValue();
break;
case HSSFCell.CELL_TYPE_NUMERIC:
strCell = String.valueOf(cell.getNumericCellValue());
break;
case HSSFCell.CELL_TYPE_BOOLEAN:
strCell = String.valueOf(cell.getBooleanCellValue());
break;
case HSSFCell.CELL_TYPE_BLANK:
strCell = "";
break;
default:
strCell = "";
break;
}
if (strCell.equals("") || strCell == null) {
return "";
}
if (cell == null) {
return "";
}
}
return strCell;
}
/**
* 获取单元格数据内容为日期类型的数据
* @param cell Excel单元格
* @return String 单元格数据内容
*/
private String getDateCellValue(HSSFCell cell) {
String result = "";
try {
int cellType = cell.getCellType();
if (cellType == HSSFCell.CELL_TYPE_NUMERIC) {
Date date = cell.getDateCellValue();
result = (date.getYear() + 1900) + "-" + (date.getMonth() + 1)
+ "-" + date.getDate();
} else if (cellType == HSSFCell.CELL_TYPE_STRING) {
String date = getStringCellValue(cell);
result = date.replaceAll("[年月]", "-").replace("日", "").trim();
} else if (cellType == HSSFCell.CELL_TYPE_BLANK) {
result = "";
}
} catch (Exception e) {
System.out.println("日期格式不正确!");
e.printStackTrace();
}
return result;
}
public static void main(String[] args) {
try {
//对读取Excel表格标题测试
InputStream is = new FileInputStream("C:/Users/ninemax/Documents/Tencent Files/1061076658/FileRecv/人口孕检 - 副本.xls");
ExcelReader excelReader = new ExcelReader();
String[] title = excelReader.readExcelTitle(is);
System.out.println("获得Excel表格的标题:");
for (String s : title) {
System.out.print(s + " ");
}
//对读取Excel表格内容测试
InputStream is2 = new FileInputStream("C:/Users/ninemax/Documents/Tencent Files/1061076658/FileRecv/人口孕检 - 副本.xls");
Map<Integer,String> map = excelReader.readExcelContent(is2);
System.out.println();
System.out.println("获得Excel表格的内容:");
for (int i=1; i<=map.size(); i++) {
System.out.println(map.get(i).replace("-", " "));
}
} catch (FileNotFoundException e) {
System.out.println("未找到指定路径的文件!");
e.printStackTrace();
}
//往excel中写入内容
List<ExcelVo> vos=new ArrayList<ExcelVo>();
vos=getData();
WriterDataToExcel(vos);
}
private static List<ExcelVo> getData() {
List<ExcelVo> vos=new ArrayList<ExcelVo>();
Connection conn=DBCenter.getConnection();
try {
Statement st=conn.createStatement();
String sql="select top(5000) a.sid as sid,b.ti as title,b.kw as keyword,b.ab as abstract,a.phrase as phrase,a.wxtype as wxtype,a.startpos as startpos,a.length as length,a.sentence as sentence,a.total_sentence as total_sentence from dbo.zdbz_yike_phrase_metamap_ts3 as a join nstl_test.dbo.pb18001949_test as b on a.sid=b.id order by sid asc";
ResultSet rs=st.executeQuery(sql);
while(rs.next()){
ExcelVo vo=new ExcelVo();
vo.setSid(rs.getString(1));
vo.setTitle(rs.getString("title"));
vo.setKeyword(rs.getString("keyword"));
vo.setAbstrat(rs.getString("abstract"));
vo.setPhrase(rs.getString("phrase"));
vo.setWxtype(rs.getString("wxtype"));
vo.setStartpos(rs.getInt("startpos"));
vo.setLength(rs.getInt("length"));
vo.setSentence(rs.getInt("sentence"));
vo.setTotal_sentence(rs.getInt("total_sentence"));
vos.add(vo);
}
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return vos;
}
public static void WriterDataToExcel(List<ExcelVo> vos){
String outputFile="D:\\test.xls";
try{
HSSFWorkbook workbook = new HSSFWorkbook();
HSSFSheet sheet = workbook.createSheet();
// 创建新的Excel 工作簿
for(int i=0;i<vos.size();i++){
// for(int j=0;j<10;j++){
// 在索引0的位置创建行（最顶端的行）
HSSFRow row = sheet.createRow((short)i);
HSSFCell cell = row.createCell(0);
HSSFCell cell1 = row.createCell(1);
HSSFCell cell2 = row.createCell(2);
HSSFCell cell3 = row.createCell(3);
HSSFCell cell4 = row.createCell(4);
HSSFCell cell5 = row.createCell(5);
HSSFCell cell6 = row.createCell(6);
HSSFCell cell7 = row.createCell(7);
HSSFCell cell8 = row.createCell(8);
HSSFCell cell9 = row.createCell(9);
// // 定义单元格为字符串类型
cell.setCellValue(vos.get(i).getSid());
cell1.setCellValue(vos.get(i).getTitle());
if(vos.get(i).getKeyword()==null){
cell2.setCellValue("NULL");
}else{
cell2.setCellValue(vos.get(i).getKeyword());
}
cell3.setCellValue(vos.get(i).getAbstrat());
cell4.setCellValue(vos.get(i).getPhrase());
cell5.setCellValue(vos.get(i).getWxtype());
cell6.setCellValue(vos.get(i).getStartpos());
cell7.setCellValue(vos.get(i).getLength());
cell8.setCellValue(vos.get(i).getSentence());
cell9.setCellValue(vos.get(i).getTotal_sentence());
// // 在单元格中输入一些内容
// if(j==0){
// cell.setCellValue(vos.get(i).getSid());
// }
// if(j==1){
// cell.setCellValue(vos.get(i).getTitle());
// }
// if(j==2){
// cell.setCellValue(vos.get(i).getKeyword());
// }
// if(j==3){
// cell.setCellValue(vos.get(i).getAbstrat());
// }
// if(j==4){
// cell.setCellValue(vos.get(i).getPhrase());
// }
// if(j==5){
// cell.setCellValue(vos.get(i).getWxtype());
// }
// if(j==6){
// cell.setCellValue(vos.get(i).getStartpos());
// }
// if(j==7){
// cell.setCellValue(vos.get(i).getLength());
// }
// if(j==8){
// cell.setCellValue(vos.get(i).getSentence());
// }
// if(j==9){
// cell.setCellValue(vos.get(i).getTotal_sentence());
// }
// 把相应的Excel 工作簿存盘
FileOutputStream fOut = new FileOutputStream(outputFile);
workbook.write(fOut);
fOut.flush();
// 操作结束，关闭文件
fOut.close();
// }
}
// }
System.out.println("文件生成...");
}catch(Exception e){
e.printStackTrace();
}
// }
}
}
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