使用反射机制的通用导入导出excel功能demo

package com.feifei.utils;


import java.io.File;
import java.io.IOException;
import java.lang.reflect.Field;
import java.util.ArrayList;

import com.feifei.entity.Book;

import jxl.Cell;
import jxl.Sheet;
import jxl.Workbook;
import jxl.write.Label;
import jxl.write.WritableSheet;
import jxl.write.WritableWorkbook;

public class ExcelUtils {
        
        //通用导出功能
        public static void excelOut(ArrayList ary,String dirPath,String filename) {
                WritableWorkbook workbook = null;
                File path = new File(dirPath);
                if(!path.exists()) {
                        
                        path.mkdir();
                }
                File file = new File(dirPath + "/" + filename);
                if(!file.exists()) {
                        try {
                                file.createNewFile();
                        } catch (IOException e) {
                                e.printStackTrace();
                        }
                }
                try {
                        workbook = Workbook.createWorkbook(file);
                        
                        WritableSheet sheet = workbook.createSheet("sheet1", 0);
                        
                        for (int i = 0; i < ary.size(); i ++) {
                                Object obj = ary.get(i);
                                Class cls = obj.getClass();
                                Field[] fields = cls.getDeclaredFields();
                                for(int j = 0; j < fields.length; j ++) {
                                        Field field = fields[j];
                                        field.setAccessible(true);
                                        
                                        if (field.getType().getName().equals("double")) {
                                                sheet.addCell(new Label(j, i,String.valueOf(field.getDouble(obj))));
                                        }else if(field.getType().getName().equals("int")) {
                                                sheet.addCell(new Label(j, i,String.valueOf(field.getInt(obj))));
                                        } else  {
                                                sheet.addCell(new Label(j, i,String.valueOf(field.get(obj))));
                                        }
                                }
                                
                        }
                        workbook.write();
                } catch (Exception e) {
                        e.printStackTrace();
                } finally{
                        try {
                                workbook.close();
                        } catch (Exception e) {
                                e.printStackTrace();
                        } 
        }
 }
        
        public static ArrayList excelIn(Class cls,String filepath) {
                ArrayList ary = new ArrayList();
                Workbook workbook = null;
                try {
                        workbook = Workbook.getWorkbook(new File(filepath));
                        Sheet sheet = workbook.getSheet(0);
                        for (int i = 0; i < sheet.getRows(); i++) {
                                
                                Object obj = cls.newInstance();
                                Field[] fields = cls.getDeclaredFields();
                                for (int j = 0; j < fields.length; j++) {
                                        Field field = fields[j];
                                        Cell cell = sheet.getCell(j, i);
                                        field.setAccessible(true);
                                        if(field.getType().getName().equals("int")) {
                                                field.setInt(obj, Integer.parseInt((cell.getContents())));
                                        } else if(field.getType().getName().equals("double")){
                                                field.setDouble(obj, Double.parseDouble(cell.getContents()));
                                        } else {
                                                field.set(obj, String.valueOf(cell.getContents()));
                                        }
                            }
                                ary.add(obj);
                        }
                        
                } catch (Exception e) {
                        e.printStackTrace();
                } finally{
                        workbook.close();
                }
                return ary;
        }
        
        public static void main(String[] args) {
//                ArrayList ary = new ArrayList(); 
//                for (int i = 0; i < 10; i++) {
//                        Book book = new Book();
//                        book.setId(i);
//                        book.setName("西游记");
//                        book.setTitle("呵呵");
//                        ary.add(book);
//                }
//                excelOut(ary, "D:/good", "book.xls");
                
                ArrayList list = excelIn(Book.class, "D:/good/book.xls");
                for (Object object : list) {
                        Book book = (Book)object;
                        System.out.println(book.getId() + ":" + book.getName() + ":" + book.getPrice() + ":" + book.getTitle());
                }
                
        }
}