java中使用jxl导出excel时，需指定WritableSheet对象中对应于每个单元格的数据。List类型是一种常用的数据类型，它里面的元素是实体对象，当将它创建为WritableSheet对象时，它的每个实体元素可以通过简单索引循环的形式遍历到，但对实体每个属性的遍历，却不能以简单索引循环的形式实现，而只能用getter方法去逐一获取，这样，对不同的实体，均需特定的实现代码与之对应，势必会造成大量的代码冗余。
一种有效的策略是，将List转化为jsonArray，把实体对象的属性名构造为一个字符串数组，那么，只需使用该数组的索引，对每个json对象循环访问它的字符串形式的键，便可完成对属性值的遍历。
示例：
实体类Student
public class Student {
private String name;
private String gender;
private int age;
public Student(String name, String gender, int age) {
this.name = name;
this.gender = gender;
this.age = age;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getGender() {
return gender;
}
public void setGender(String gender) {
this.gender = gender;
}
public int getAge() {
return age;
}
public void setAge(int age) {
this.age = age;
}
}
JsonArray导出为Exclel
import jxl.Workbook;
import jxl.write.Label;
import jxl.write.WritableSheet;
import jxl.write.WritableWorkbook;
import net.sf.json.JSONArray;
import net.sf.json.JSONObject;
import java.io.File;
import java.lang.reflect.Field;
import java.util.ArrayList;
import java.util.List;
public class JSONArrayToExcel {
public static void main(String[] args) {
Student student1 = new Student("张三","男",18);
Student student2 = new Student("李四","男",19);
Student student3 = new Student("小花","女",20);
//实体List
List studentList = new ArrayList<>();
studentList.add(student1);
studentList.add(student2);
studentList.add(student3);
//List转为JSONArray
JSONArray jsonArray = JSONArray.fromObject(studentList);
//实体属性名称数组
Field[] fields = null;
try {
Class clazz = Class.forName("Student");
fields = clazz.getDeclaredFields();
}catch (Exception e){
e.printStackTrace();
}
if (fields != null){
String fileName = "jsonarrayToExcelTest.xls"; //文件名
File myFile = new File("./"+fileName);
try {
WritableWorkbook writableWorkbook = Workbook.createWorkbook(myFile); //定义工作簿对象
WritableSheet writableSheet = writableWorkbook.createSheet("sheet1",0); //定义sheet对象
for (int i = 0; i < fields.length; i++) { //加入表头单元格内容
writableSheet.addCell(new Label(i,0,fields[i].getName()));
}
for (int i = 0; i < jsonArray.size(); i++) { //加入数据单元格内容
JSONObject json = jsonArray.getJSONObject(i);
for (int j = 0; j < fields.length; j++) {
writableSheet.addCell(new Label(j,i+1,json.get(fields[j].getName()).toString()));
}
}
writableWorkbook.write();
writableWorkbook.close();
}catch (Exception e){
e.printStackTrace();
}
}
}
}
参考：
- https://blog.csdn.net/Albert201605/article/details/120331212
- https://blog.csdn.net/WangKun_0612/article/details/83618094
- https://blog.csdn.net/qqllife/article/details/77237969?spm=1001.2101.3001.6650.10&utm_medium=distribute.pc_relevant.none-task-blog-2~default~CTRLIST~default-10.highlightwordscore&depth_1-utm_source=distribute.pc_relevant.none-task-blog-2~default~CTRLIST~default-10.highlightwordscore
Original: https://www.cnblogs.com/flyup/p/15611675.html
Author: 归去_来兮
Title: Java中将jsonArray导出为Excel
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