使用java进行excel读取和写入

1:添加处理excel的依赖jar包2:向excel中写入内容的类WriteExcel.java3:读取Excel中的数据,并写入list中4:在D盘下面创建readExcel.xls(有内容

1:添加处理excel的依赖jar包

        <!-- 引入poi,解析workbook视图 -->
        <dependency>
            <groupId>org.apache.poi</groupId>
            <artifactId>poi</artifactId>
            <version>3.16</version>
        </dependency>
        <dependency>
            <groupId>org.apache.poi</groupId>
            <artifactId>poi-ooxml</artifactId>
            <version>3.14</version>
        </dependency>
        <!-- 处理excel和上面功能是一样的-->
        <dependency>
            <groupId>net.sourceforge.jexcelapi</groupId>
            <artifactId>jxl</artifactId>
            <version>2.6.10</version> </dependency>

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2:向excel中写入内容的类

  WriteExcel.java

此代码由Java架构师必看网-架构君整理
package com.li.controller; import java.io.File; import java.io.FileInputStream; import java.io.FileOutputStream; import java.io.IOException; import java.io.OutputStream; import java.util.ArrayList; import java.util.HashMap; import java.util.List; import java.util.Map; import org.apache.poi.hssf.usermodel.HSSFWorkbook; import org.apache.poi.ss.usermodel.Cell; import org.apache.poi.ss.usermodel.Row; import org.apache.poi.ss.usermodel.Sheet; import org.apache.poi.ss.usermodel.Workbook; import org.apache.poi.xssf.usermodel.XSSFWorkbook; public class WriteExcel { private static final String EXCEL_XLS = "xls"; private static final String EXCEL_XLSX = "xlsx"; public static void main(String[] args) { Map<String, String> dataMap=new HashMap<String, String>(); dataMap.put("BankName", "BankName"); dataMap.put("Addr", "Addr"); dataMap.put("Phone", "Phone"); List<Map> list=new ArrayList<Map>(); list.add(dataMap); writeExcel(list, 3, "D:/writeExcel.xlsx"); } public static void writeExcel(List<Map> dataList, int cloumnCount,String finalXlsxPath){ OutputStream out = null; try { // 获取总列数 int columnNumCount = cloumnCount; // 读取Excel文档 File finalXlsxFile = new File(finalXlsxPath); Workbook workBook = getWorkbok(finalXlsxFile); // sheet 对应一个工作页 Sheet sheet = workBook.getSheetAt(0); /** * 删除原有数据,除了属性列 */ int rowNumber = sheet.getLastRowNum(); // 第一行从0开始算 System.out.println("原始数据总行数,除属性列:" + rowNumber); for (int i = 1; i <= rowNumber; i++) { Row row = sheet.getRow(i); sheet.removeRow(row); } // 创建文件输出流,输出电子表格:这个必须有,否则你在sheet上做的任何操作都不会有效 out = new FileOutputStream(finalXlsxPath); workBook.write(out); /** * 往Excel中写新数据 */ for (int j = 0; j < dataList.size(); j++) { // 创建一行:从第二行开始,跳过属性列 Row row = sheet.createRow(j + 1); // 得到要插入的每一条记录 Map dataMap = dataList.get(j); String name = dataMap.get("BankName").toString(); String address = dataMap.get("Addr").toString(); String phone = dataMap.get("Phone").toString(); for (int k = 0; k <= columnNumCount; k++) { // 在一行内循环 Cell first = row.createCell(0); first.setCellValue(name); Cell second = row.createCell(1); second.setCellValue(address); Cell third = row.createCell(2); third.setCellValue(phone); } } // 创建文件输出流,准备输出电子表格:这个必须有,否则你在sheet上做的任何操作都不会有效 out = new FileOutputStream(finalXlsxPath); workBook.write(out); } catch (Exception e) { e.printStackTrace(); } finally{ try { if(out != null){ out.flush(); out.close(); } } catch (IOException e) { e.printStackTrace(); } } System.out.println("数据导出成功"); } /** * 判断Excel的版本,获取Workbook * @param in * @param filename * @return * @throws IOException */ public static Workbook getWorkbok(File file) throws IOException{ Workbook wb = null; FileInputStream in = new FileInputStream(file); if(file.getName().endsWith(EXCEL_XLS)){ //Excel&nbsp;2003 wb = new HSSFWorkbook(in); }else if(file.getName().endsWith(EXCEL_XLSX)){ // Excel 2007/2010 wb = new XSSFWorkbook(in); } return wb; } }

3:读取Excel中的数据,并写入list中

 

package com.li.controller;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStream;
import java.util.ArrayList;
import java.util.List;

import jxl.Sheet;
import jxl.Workbook;
import jxl.read.biff.BiffException;
public class ReadExcel {
    public static void main(String[] args) {
        ReadExcel obj = new ReadExcel();
        // 此处为我创建Excel路径:E:/zhanhj/studysrc/jxl下
        File file = new File("D:/readExcel.xls");
        List excelList = obj.readExcel(file);
        System.out.println("list中的数据打印出来");
        for (int i = 0; i < excelList.size(); i++) {
            List list = (List) excelList.get(i);
            for (int j = 0; j < list.size(); j++) {
                System.out.print(list.get(j));
            }
            System.out.println();
        }

    }
    // 去读Excel的方法readExcel,该方法的入口参数为一个File对象
    public List readExcel(File file) {
        try {
            // 创建输入流,读取Excel
            InputStream is = new FileInputStream(file.getAbsolutePath());
            // jxl提供的Workbook类
            Workbook wb = Workbook.getWorkbook(is);
            // Excel的页签数量
            int sheet_size = wb.getNumberOfSheets();
            for (int index = 0; index < sheet_size; index++) {
                List<List> outerList=new ArrayList<List>();
                // 每个页签创建一个Sheet对象
                Sheet sheet = wb.getSheet(index);
                // sheet.getRows()返回该页的总行数
                for (int i = 0; i < sheet.getRows(); i++) {
                    List innerList=new ArrayList();
                    // sheet.getColumns()返回该页的总列数
                    for (int j = 0; j < sheet.getColumns(); j++) {
                        String cellinfo = sheet.getCell(j, i).getContents();
                        if(cellinfo.isEmpty()){
                            continue;
                        }
                        innerList.add(cellinfo);
                        System.out.print(cellinfo);
                    }
                    outerList.add(i, innerList);
                    System.out.println();
                }
                return outerList;
            }
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        } catch (BiffException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }
        return null;
    }
}

4:在D盘下面创建readExcel.xls(有内容) 和writeExcel.xlsx即可

 

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