实现一个配置简单功能强大的excel工具类搞定excel导入导出(二)

上篇文章留了个小悬念,您是否有这样的需求呢:
1.实体类中存放的值是一个编码,而导出的文件中需要把编码转成有意义的文字.例如:实体类中性别用0,1表示,而希望导出的excel文件中是"男","女".
2.想对导入的内容加一些逻辑,例如:判断某些值不能为空.或判断年龄不能小于0且不能大于100.

我们可以用一个中间类来实现这个功能.

请看代码:

(1)我们程序中真正的实体类:

package com.tgb.lk.test04;

import java.util.Date;

public class Student {
	private int id;

	private String name;

	private int sex;

	private int clazz;

	private Date birthday;

	private String company;

	public int getId() {
		return id;
	}

   //get和set方法(略).....

	@Override
	public String toString() {
		return "Student [birthday=" + birthday + ", clazz=" + clazz
				+ ", company=" + company + ", id=" + id + ", name=" + name
				+ ", sex=" + sex + "]";
	}

}

(2)我们用于导入导出的excelVO类:

package com.tgb.lk.test04;

import com.tgb.lk.util.ExcelVOAttribute;

public class StudentVO {

	@ExcelVOAttribute(name = "姓名", column = "B", isExport = true, prompt = "姓名为必填项哦!")
	private String name;

	@ExcelVOAttribute(name = "性别", column = "C", combo = { "男", "女" })
	private String sex;

	@ExcelVOAttribute(name = "班级", column = "D", combo = { "五期提高班", "六期提高班",
			"七期提高班" })
	private String clazz;
	
	@ExcelVOAttribute(name="生日",column="E")
	private String birthday;

	@ExcelVOAttribute(name = "公司", column = "F")
	private String company;

	public String getName() {
		return name;
	}

	public void setName(String name) {
		this.name = name;
	}

	public String getSex() {
		return sex;
	}

	public void setSex(String sex) {
		this.sex = sex;
	}

	public String getClazz() {
		return clazz;
	}

	public void setClazz(String clazz) {
		this.clazz = clazz;
	}

	public String getCompany() {
		return company;
	}

	public void setCompany(String company) {
		this.company = company;
	}

	public String getBirthday() {
		return birthday;
	}

	public void setBirthday(String birthday) {
		this.birthday = birthday;
	}

	@Override
	public String toString() {
		return "StudentVO [birthday=" + birthday + ", clazz=" + clazz
				+ ", company=" + company + ", name=" + name + ", sex=" + sex
				+ "]";
	}
}

(3)导出demo,注意convertStu2VO方法,这个方法中实现了我们导出时把编码转成有意义的文字功能.

package com.tgb.lk.test04;

import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Date;
import java.util.List;

import com.tgb.lk.util.ExcelUtil;

/*
 * 使用步骤:
 * 1.新建一个类,例如StudentVO.
 * 2.设置哪些属性需要导出,哪些需要设置提示.
 * 3.设置实体数据
 * 4.调用exportExcel方法.
 * 本例向您提供以下问题的解决方案:
 * 1.实体对象存放的值需要转换为其他文字的情况,例如:实例中有0,1表示男,女;而导入导出的excel中是中文的"男","女".
 * 2.实体对象的时间类型处理.
 * 
 */
public class ExportTest04 {
	public static void main(String[] args) {
		// 初始化数据
		List<Student> list = new ArrayList<Student>();

		Student stu = new Student();
		stu.setId(1);
		stu.setName("李坤");
		stu.setSex(0);
		stu.setClazz(5);
		stu.setCompany("天融信");
		stu.setBirthday(new Date());
		list.add(stu);

		Student stu2 = new Student();
		stu2.setId(2);
		stu2.setName("曹贵生");
		stu2.setSex(0);
		stu2.setClazz(5);
		stu2.setCompany("中银");
		list.add(stu2);

		Student stu3 = new Student();
		stu3.setId(3);
		stu3.setName("李学宇");
		stu3.setSex(1);
		stu3.setClazz(6);
		list.add(stu3);

		FileOutputStream out = null;
		try {
			out = new FileOutputStream("d:\\success4.xls");
		} catch (FileNotFoundException e) {
			e.printStackTrace();
		}
		ExcelUtil<StudentVO> util = new ExcelUtil<StudentVO>(StudentVO.class);
		util.exportExcel(convertStu2VO(list), "学生信息", 60000, out);
		System.out.println("----执行完毕----------");
	}
	
	//将student对象转换为studentVO用于导出.
	private static List<StudentVO> convertStu2VO(List<Student> list) {
		List<StudentVO> list2 = new ArrayList<StudentVO>();
		SimpleDateFormat sdf = new SimpleDateFormat("yyyy/M/d HH:mm:ss");
		for (int i = 0; i < list.size(); i++) {
			StudentVO stuVo = new StudentVO();
			Student stu = list.get(i);
			stuVo.setName(stu.getName());
			switch (stu.getSex()) {
			case 0:
				stuVo.setSex("男");
				break;
			case 1:
				stuVo.setSex("女");
				break;
			default:
				break;
			}
			//处理时间
			if (stu.getBirthday() != null) {
				stuVo.setBirthday(sdf.format(stu.getBirthday()));
			}

			switch (stu.getClazz()) {
			case 5:
				stuVo.setClazz("五期提高班");
				break;
			case 6:
				stuVo.setClazz("六期提高班");
				break;
			case 7:
				stuVo.setClazz("七期提高班");
			default:
				break;
			}
			list2.add(stuVo);
		}

		return list2;
	}

}

(4)导入demo,在convertStu2VO这个方法中我们可以加一些逻辑控制.

package com.tgb.lk.test04;

import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.List;

import com.tgb.lk.util.ExcelUtil;

public class ImportTest04 {
	public static void main(String[] args) {
		FileInputStream fis = null;
		try {
			fis = new FileInputStream("d:\\success4.xls");
			ExcelUtil<StudentVO> util = new ExcelUtil<StudentVO>(
					StudentVO.class);
			List<StudentVO> list = util.importExcel("学生信息", fis);
			System.out.println(list);
			//输出:[StudentVO [birthday=2012/9/22 15:44:10, clazz=五期提高班, company=null, name=李坤, sex=男], StudentVO [birthday=null, clazz=五期提高班, company=null, name=曹贵生, sex=男], StudentVO [birthday=null, clazz=六期提高班, company=null, name=李学宇, sex=女]]
			System.out.println(convertStu2VO(list));
			//输出:[Student [birthday=Sat Sep 22 15:44:10 CST 2012, clazz=5, company=null, id=0, name=李坤, sex=0], Student [birthday=null, clazz=5, company=null, id=0, name=曹贵生, sex=0], Student [birthday=null, clazz=6, company=null, id=0, name=李学宇, sex=1]]
		} catch (FileNotFoundException e) {
			e.printStackTrace();
		}
	}

	private static List<Student> convertStu2VO(List<StudentVO> list) {
		List<Student> retList = new ArrayList<Student>();
		SimpleDateFormat sdf = new SimpleDateFormat("yyyy/M/d HH:mm:ss");
		for (int i = 0; i < list.size(); i++) {
			StudentVO vo = list.get(i);
			Student student = new Student();
			student.setName(vo.getName());

			//在这个方法中还可以控制不允许为空,年龄值不能小于0后大于100等逻辑.
			
			String sex = vo.getSex();
			if (sex.equals("男")) {
				student.setSex(0);
			} else {
				student.setSex(1);
			}
			
			if (vo.getBirthday()!=null && !vo.getBirthday().trim().equals("")) {
				try {
					student.setBirthday(sdf.parse(vo.getBirthday()));
				} catch (ParseException e) {
					e.printStackTrace();
				}
			}

			String clazz = vo.getClazz();
			if (clazz != null) {
				if (clazz.equals("五期提高班")) {
					student.setClazz(5);
				} else if (clazz.equals("六期提高班")) {
					student.setClazz(6);
				} else if (clazz.equals("七期提高班")) {
					student.setClazz(7);
				} else {
					System.out.println("输入的数据不合法");
				}
			}
			retList.add(student);
		}
		return retList;
	}
}

 

    代码下载: http://download.csdn.net/detail/lk_blog/4588280

 

实现一个配置简单功能强大的excel工具类搞定excel导入导出
http://blog.csdn.net/lk_blog/article/details/8007777
http://blog.csdn.net/lk_blog/article/details/8007837

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