poi進行簡單的excel解析

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;
import org.junit.Test;

import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.util.*;
/**
 * 測試poi
 */
public class TestPOI1 {
    /**
     * 測試poi
     * XSSFWorkbook解析xlsx
     */
    @Test
    public void testXlsx(){
       File file = new File("C:\\test.xlsx");
       if (!file.exists()){
           //文件不存在，直接return
           return;
       }
        FileInputStream fis = null;
        Workbook workbook = null;
        try {
            fis = new FileInputStream(file);
            workbook = new XSSFWorkbook(fis);
            //調用方法
            dealWorkBook(workbook);
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            if (fis != null){
                try {
                    fis.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
            if (workbook != null){
                try {
                    workbook.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }
    }

    /**
     * 測試poi
     * HSSFWorkbook解析xls
     */
    @Test
    public void testXls() {
        File file = new File("C:\\test.xls");
        if (!file.exists()) {
            //文件不存在，直接return
            return;
        }
        FileInputStream fis = null;
        Workbook workbook = null;
        try {
            fis = new FileInputStream(file);
            workbook = new HSSFWorkbook(fis, true);
            //調用方法
            dealWorkBook(workbook);
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            if (fis != null) {
                try {
                    fis.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
            if (workbook != null) {
                try {
                    workbook.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }
    }



    public void dealWorkBook(Workbook workbook){
        workbook.setSheetName(0,"你的酒館對我打了烊");
        System.out.println(workbook.getSheetName(0));

        Sheet sheet = workbook.getSheetAt(0);//獲取第一個sheet
        HashMap<Integer, List<String>> map = new HashMap<Integer, List<String>>();
        int i = 0;
        for(Row row : sheet){
            map.put(i,new ArrayList<String>());
            for (Cell cell : row){
                switch (cell.getCellType()){
                    case STRING:
                        map.get(i).add(cell.getRichStringCellValue().getString()); // 如果是字符串則保存
                        break;
                    case _NONE:
                        break;
                    case NUMERIC:
                        map.get(i).add(cell.getNumericCellValue()+""); //將數值轉換爲字符串
                        break;
                    case BOOLEAN:
                        break;
                    case FORMULA:
                        break;
                    case BLANK:
                        break;
                    case ERROR:
                        break;
                }
            }
            i++;
        }
        //遍歷excel表格
        Set<Integer> keys = map.keySet();
        Iterator<Integer> its = keys.iterator();
        while (its.hasNext()){
            List<String> list = map.get(its.next());
            for (String s : list) {
                System.out.println(s+"   ");
            }
        }
    }
}