Java反射机制，实现Excel的导入与导出

缺乏、安全感 2022-07-12 09:45 181阅读 0赞

一、下载jxl.jar包导入到工程中

[http://download.csdn.net/detail/lrici/9758600  
][http_download.csdn.net_detail_lrici_9758600]

二、新建Book.[Java][]

package com.cc.reflection;
    
    public class Book {
    	
    	private int id;
    	private String name;
    	private String type;
    	public int getId() {
    		return id;
    	}
    	public void setId(int id) {
    		this.id = id;
    	}
    	public String getName() {
    		return name;
    	}
    	public void setName(String name) {
    		this.name = name;
    	}
    	public String getType() {
    		return type;
    	}
    	public void setType(String type) {
    		this.type = type;
    	}
    	
    
    }

三、新建ExcelUtil.java

package com.cc.utils;
    
    
    import java.io.File;
    import java.io.IOException;
    import java.lang.reflect.Field;
    import java.util.ArrayList;
    
    import javax.rmi.CORBA.Util;
    
    import com.cc.reflection.Book;
    import com.cc.reflection.ExcelBook;
    
    import jxl.Sheet;
    import jxl.Workbook;
    import jxl.read.biff.BiffException;
    import jxl.write.Label;
    import jxl.write.WritableSheet;
    import jxl.write.WritableWorkbook;
    import jxl.write.WriteException;
    
    public class ExcelUtil {
    	
    	
        //通用的导出方法
    	public static void excelOut(ArrayList ar, String str) {
    		WritableWorkbook bWorkbook = null;
    
    		try {
    			bWorkbook = Workbook.createWorkbook(new File(str));
    			WritableSheet sheet = bWorkbook.createSheet("sheet", 0);
    			for (int i = 0; i < ar.size(); i++) {
    				Object ob = ar.get(i);
    				Class class1 = ob.getClass();
    				Field[] fields = class1.getDeclaredFields();
    				for (int j = 0; j < fields.length; j++) {
    					fields[j].setAccessible(true);
    					Label label = new Label(j, i, String.valueOf(fields[j].get(ob)));
    					sheet.addCell(label);
    			
    				}
    			}
    			bWorkbook.write();
    		} catch (Exception e) {
    			// TODO Auto-generated catch block
    			e.printStackTrace();
    		} finally {
    			try {
    				bWorkbook.close();
    			} catch (WriteException e) {
    				// TODO Auto-generated catch block
    				e.printStackTrace();
    			} catch (IOException e) {
    				// TODO Auto-generated catch block
    				e.printStackTrace();
    			}
    		}
    
    	}
    	//通用的导入方法
    	public static ArrayList excelIn(Class class1,String str){
    		ArrayList arrayList =new ArrayList();
    		Workbook bWorkbook =null;
    		try {
    			bWorkbook=Workbook.getWorkbook(new File(str));
    			Sheet sheet=bWorkbook.getSheet(0);
    			Field[] fields=class1.getDeclaredFields();
    			for (int i = 0; i < sheet.getRows(); i++) {
    				//不知道获取的对象是什么，所以用object来代替
    				Object object=class1.newInstance();  
    				for (int j = 0; j < fields.length; j++) {
    					fields[j].setAccessible(true);
    					String string=sheet.getCell(j,i).getContents();
    					//如果获取的是一个字符串类型的数据
    					if(fields[j].getType().toString().equals("class java.lang.String")){
    						//将获取到的数据封装到object对象中
    						fields[j].set(object,string);
    					}else if(fields[j].getType().toString().equals("int")){
    						fields[j].set(object,Integer.valueOf(string));
    						
    					}
    				}
    				arrayList.add(object);
    				
    			}
    		} catch (BiffException e) {
    			// TODO Auto-generated catch block
    			e.printStackTrace();
    		} catch (Exception e) {
    			// TODO Auto-generated catch block
    			e.printStackTrace();
    		}finally {
    			bWorkbook.close();
    		}
    		return arrayList;
    	}
    	
    	public static void main(String[] args) {
    		
    //		//将数据导出到Excel中
    //		ExcelBook book = new ExcelBook();
    //		ArrayList<Book> arrayList = new ArrayList<Book>();
    //		Book bo = new Book();
    //		bo.setId(1);
    //		bo.setName("酒馆");
    //		bo.setType("生活");
    //
    //		Book bo1 = new Book();
    //		bo1.setId(2);
    //		bo1.setName("酒馆1");
    //		bo1.setType("生活1");
    //
    //		arrayList.add(bo);
    //		arrayList.add(bo1);
    //		ExcelUtil.excelOut(arrayList, "D:/jiudina.xls");
    		
    		//将Excel中的数据导入
    		ArrayList<Book> arrayList2 = ExcelUtil.excelIn(Book.class,"D:/jiudina.xls");
    		for (Book book1 : arrayList2) {
    			System.out.println(book1.getName()+book1.getType());
    		}
    		
    	}
    
    }

四、点击运行，需要保证D盘有jiudina.xls 文件且文件中内容符合Book.java的对应类型

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