使用Java语言将excel中读取到的内容导入Linux的文件中

一、maven配置

导入excel表格需要使用的依赖：

    
    
      org.apache.poi
      poi
      4.0.0
    

    
    
      org.apache.poi
      poi-ooxml
      4.0.0
    

二、测试程序

package utils;

import java.io.*;

import org.apache.poi.hssf.usermodel.HSSFWorkbook;
import org.apache.poi.ss.usermodel.*;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;


public class AddData {

    public static String userPath = "C:/Users/DELL/Desktop/user";
    public static String excelPath = "C:/Users/DELL/Desktop/user.xlsx";
    public static BufferedReader userIn = null;
    public static BufferedWriter userOut = null;
    public static int userNum ;
    public static int excelUserNum;
    public static String userContent = null;
    public static String excelContent = null;

    public static String readUserInfo(String userPath){
        StringBuilder userInfo = new StringBuilder();  //将读到的user表信息放在userInfo中
        try {
            userIn = new BufferedReader(new InputStreamReader(
                    new FileInputStream(userPath),"GBK"));
            userNum = Integer.parseInt(userIn.readLine());
            System.out.println(userNum);

            String temp = null;
            int line = 1;
            // 一次读入一行，直到读入null为文件结束
            while ((temp = userIn.readLine()) != null) {
                // 显示行号
                System.out.println("line " + line + ": " + temp);
                userInfo.append(temp + "\n");
                line++;
            }
            return userInfo.toString();
        } catch (Exception e) {
            e.printStackTrace();
        }finally {
            try {
                userIn.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
        return userInfo.toString();
    }


    public static String readExcelInfo(String excelPath){
        StringBuilder excelInfo = new StringBuilder();  //将读到的excel表信息放在excelInfo中
        try {
            File excel = new File(excelPath);
            if (excel.isFile() && excel.exists()) {   //判断文件是否存在

                String[] split = excel.getName().split("\\.");  //.是特殊字符，需要转义！！！！！
                Workbook wb;
                //根据文件后缀（xls/xlsx）进行判断
                if ( "xls".equals(split[1])){
                    FileInputStream fis = new FileInputStream(excel);   //文件流对象
                    wb = new HSSFWorkbook(fis);
                }else if ("xlsx".equals(split[1])){
                    wb = new XSSFWorkbook(excel);
                }else {
                    System.out.println("文件类型错误!");
                    throw new Exception("文件类型错误");
                }

                //开始解析
                Sheet sheet = wb.getSheetAt(0);     //读取sheet 0

                int firstRowIndex = sheet.getFirstRowNum()+1;   //第一行是列名，所以不读
                int lastRowIndex = sheet.getLastRowNum();
                excelUserNum = lastRowIndex;
                System.out.println("firstRowIndex: "+firstRowIndex);
                System.out.println("lastRowIndex: "+lastRowIndex);

                for(int rIndex = firstRowIndex; rIndex <= lastRowIndex; rIndex++) {   //遍历行
                    System.out.println("rIndex: " + rIndex );
                    Row row = sheet.getRow(rIndex);
                    if (row != null) {
                        int firstCellIndex = row.getFirstCellNum();
                        int lastCellIndex = row.getLastCellNum();

                        for(int i = firstCellIndex; i < 16 + firstCellIndex; i++){
                            if (i == 0) {   //遍历列lastCellIndex
                                Cell cell = row.getCell(i);
                                if (cell != null) {
                                    cell.setCellType(CellType.STRING);
                                    excelInfo.append(cell.toString() + "\n");  //学号作为ID
                                    excelInfo.append(cell.toString() + "\n");  //学号也作为密码
                                }
                            }else if(i == 1){
                                Cell cell = row.getCell(i);
                                if (cell != null) {
                                    cell.setCellType(CellType.STRING);
                                    excelInfo.append(cell.toString()+ "\n");  //姓名
                                }
                            }else if(i == 15){
                                excelInfo.append("localhost\n");  //最后一行信息
                            }else{
                                excelInfo.append("1\n");  //其余行默认为1
                            }
                        }
                    }
                }
                return excelInfo.toString();
            } else {
                System.out.println("找不到指定的文件");
                throw new Exception("找不到指定的文件");
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
        return excelInfo.toString();
    }


    public static void writeUserInfo(String userPath,String excelPath) { //向文件末尾添加数据
        userContent = readUserInfo(userPath);
        excelContent = readExcelInfo(excelPath);
        int totalNum = userNum + excelUserNum;
        try {
            userOut = new BufferedWriter(new OutputStreamWriter(
                    new FileOutputStream(userPath),"GBK"));
            userOut.write(totalNum + "\n");  //写文件第一行用户数
            userOut.write(userContent);  //写原文件中的信息
            userOut.write(excelContent);  //写excel文件中的信息
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            try {
                userOut.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    }


    public static void main(String[] args){
        writeUserInfo(userPath,excelPath);
    }
}