java读取写入exec-方法一

1.添加处理excel的依赖jar包

    
        org.apache.poi
        poi
        3.16
    
    
        org.apache.poi
        poi-ooxml
        3.14
    
    
    
        net.sourceforge.jexcelapi
        jxl
        2.6.10
    

2：向excel中写入内容的类

WriteExcel.java
　　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 dataMap=new HashMap();
    dataMap.put("BankName", "BankName");
    dataMap.put("Addr", "Addr");
    dataMap.put("Phone", "Phone");
    List

}

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 outerList=new ArrayList();
            // 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;
}

}