實現一個配置簡單功能強大的excel工具類搞定excel匯入匯出(二)
阿新 • • 發佈：2019-01-08
上篇文章留了個小懸念,您是否有這樣的需求呢:
1.實體類中存放的值是一個編碼,而匯出的檔案中需要把編碼轉成有意義的文字.例如:實體類中性別用0,1表示,而希望匯出的excel檔案中是"男","女".
2.想對匯入的內容加一些邏輯,例如:判斷某些值不能為空.或判斷年齡不能小於0且不能大於100.
我們可以用一箇中間類來實現這個功能.
請看程式碼:
(1)我們程式中真正的實體類:
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)我們用於匯入匯出的excelVO類:
package com.tgb.lk.test04; import com.tgb.lk.util.ExcelVOAttribute; public class StudentVO { @ExcelVOAttribute(name = "姓名", column = "B", isExport = true, prompt = "姓名為必填項哦!") private String name; @ExcelVOAttribute(name = "性別", column = "C", combo = { "男", "女" }) private String sex; @ExcelVOAttribute(name = "班級", 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)匯出demo,注意convertStu2VO方法,這個方法中實現了我們匯出時把編碼轉成有意義的文字功能.
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; /* * 使用步驟: * 1.新建一個類,例如StudentVO. * 2.設定哪些屬性需要匯出,哪些需要設定提示. * 3.設定實體資料 * 4.呼叫exportExcel方法. * 本例向您提供以下問題的解決方案: * 1.實體物件存放的值需要轉換為其他文字的情況,例如:例項中有0,1表示男,女;而匯入匯出的excel中是中文的"男","女". * 2.實體物件的時間型別處理. * */ public class ExportTest04 { public static void main(String[] args) { // 初始化資料 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("曹貴生"); stu2.setSex(0); stu2.setClazz(5); stu2.setCompany("中銀"); list.add(stu2); Student stu3 = new Student(); stu3.setId(3); stu3.setName("李學宇"); 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), "學生資訊", 60000, out); System.out.println("----執行完畢----------"); } //將student物件轉換為studentVO用於匯出. 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; } //處理時間 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)匯入demo,在convertStu2VO這個方法中我們可以加一些邏輯控制.
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("學生資訊", fis);
System.out.println(list);
//輸出:[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=曹貴生, sex=男], StudentVO [birthday=null, clazz=六期提高班, company=null, name=李學宇, sex=女]]
System.out.println(convertStu2VO(list));
//輸出:[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=曹貴生, sex=0], Student [birthday=null, clazz=6, company=null, id=0, name=李學宇, 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());
//在這個方法中還可以控制不允許為空,年齡值不能小於0後大於100等邏輯.
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("輸入的資料不合法");
}
}
retList.add(student);
}
return retList;
}
}
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