JXL导出Excel通用模板
近日用注解写了一个通用的使用JXL导出成Excel的模板类，在这里记上一笔，以后方便查找使用。
第一，创建一个注解类
import java.lang.annotation.Documented;
import java.lang.annotation.ElementType;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.annotation.Target;
/**
* Excel实体BEAN的属性注解
* @author MrGao
* 2010-7-12下午05:10:37
*/
@Documented
@Retention(RetentionPolicy.RUNTIME)
@Target(ElementType.FIELD)
public @interface ExcelAnnotation {
String name();//Excel列名
int width();//Excel列宽
int id();//Excel列ID
}
第二，实现一个比较器，用于自定义字段导出到Excel的列顺序
import java.lang.reflect.Field;
import java.util.Comparator;
@SuppressWarnings("unchecked")
public class FieldComparator implements Comparator {
public int compare(Object arg0, Object arg1) {
Field fieldOne = (Field)arg0;
Field fieldTwo = (Field)arg1;
ExcelAnnotation annoOne = fieldOne.getAnnotation(ExcelAnnotation.class);
ExcelAnnotation annoTwo = fieldTwo.getAnnotation(ExcelAnnotation.class);
if(annoOne==null||annoTwo==null){
return 0;
}
return annoOne.id()-annoTwo.id();
}
}
第三，实现导出功能
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.lang.reflect.Field;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import jxl.Workbook;
import jxl.format.Alignment;
import jxl.format.Border;
import jxl.format.BorderLineStyle;
import jxl.format.Colour;
import jxl.format.Pattern;
import jxl.format.UnderlineStyle;
import jxl.format.VerticalAlignment;
import jxl.write.Label;
import jxl.write.WritableCellFormat;
import jxl.write.WritableFont;
import jxl.write.WritableSheet;
import jxl.write.WritableWorkbook;
import jxl.write.WriteException;
/**
* 导出Excel文件
*
* @author MrGao 2010-7-13下午02:19:51
*/
public class ExcelExport {
/**
* 生成Excel
*
* @param models
* 封装需要到处的数据BEAN结合
* @param className
* 导成Excel的实体BEAN包名.类名
* @param tempPath
* 生成Excel存放的临时路径
* @param excelName
* 生成的Excel名
*/
@SuppressWarnings("unchecked")
public static void createExcel(List models, String className,
String tempPath, String excelName) {
Class clasVo = null;
try {
clasVo = Class.forName(className);
OutputStream os = new FileOutputStream(tempPath + "\\" + excelName
+ ".xls");
WritableWorkbook workbook = Workbook.createWorkbook(os);
workbook.setColourRGB(Colour.BLUE2, 79, 129, 189);
WritableSheet sheet = workbook.createSheet(excelName, 0);
// jxl 最大只支持65535行 算总共需要创建多少个Sheet
int sheetCount = models.size() % 65535;
for (int i = 0; i < sheetCount; i++) {
}
// 设置行高度
sheet.setRowView(0, 400);
sheet.setRowView(2, 350);
// 用于标题
WritableFont titleFont = new WritableFont(WritableFont
.createFont("华文行楷"), 18, WritableFont.BOLD, false,
UnderlineStyle.NO_UNDERLINE, jxl.format.Colour.TEAL);
WritableCellFormat wcf_title = new WritableCellFormat(titleFont);
wcf_title.setBackground(Colour.WHITE, Pattern.SOLID);
wcf_title.setBorder(Border.RIGHT, BorderLineStyle.THIN,
Colour.GRAY_25);
wcf_title.setVerticalAlignment(VerticalAlignment.CENTRE); // 垂直对齐
wcf_title.setAlignment(Alignment.CENTRE);
// 用于列头
WritableFont headFont = new WritableFont(WritableFont
.createFont("宋体"), 11, WritableFont.BOLD, false,
UnderlineStyle.NO_UNDERLINE, jxl.format.Colour.WHITE);
WritableCellFormat wcf_head = new WritableCellFormat(headFont);
wcf_head.setBackground(Colour.LIGHT_BLUE, Pattern.PATTERN12);
wcf_head.setBorder(Border.ALL, BorderLineStyle.THIN, Colour.BLUE2);
wcf_head.setVerticalAlignment(VerticalAlignment.CENTRE); // 垂直对齐
wcf_head.setAlignment(Alignment.CENTRE);
// 用于正文
WritableFont NormalFont = new WritableFont(WritableFont
.createFont("宋体"), 11);
WritableCellFormat wcf_center = new WritableCellFormat(NormalFont);
wcf_center
.setBorder(Border.ALL, BorderLineStyle.THIN, Colour.BLUE2);
wcf_center.setVerticalAlignment(VerticalAlignment.CENTRE); // 垂直对齐
wcf_center.setAlignment(Alignment.CENTRE);
wcf_center.setWrap(true); // 是否换行
// 获取类中所有定义的字段
Field[] fields = clasVo.getDeclaredFields();
// 定义集合封装注解字段
ArrayList<Field> annoFields = new ArrayList<Field>();
for (int i = 0; i < fields.length; i++) {
Field field = fields[i];
if (field.isAnnotationPresent(ExcelAnnotation.class)) {
annoFields.add(field);
}
}
// 将集合转换为数组，以便后面排序
Field[] annoArray = {};
annoArray = annoFields.toArray(annoArray);
sheet.addCell(new Label(0, 0, excelName, wcf_title));
sheet.mergeCells(0, 0, annoArray.length == 0 ? 1
: annoArray.length - 1, 1);
// 按照注解id排序Excel列
Arrays.sort(annoArray, new FieldComparator());
// 写入Excel列头
for (int i = 0; i < annoArray.length; i++) {
Field field = annoArray[i];
// 获取该字段的注解对象
ExcelAnnotation anno = field
.getAnnotation(ExcelAnnotation.class);
sheet.setColumnView(i, anno.width());
sheet.addCell(new Label(i, 2, anno.name(), wcf_head));
}
int rowId = 3;// 写入第几行 第一行为列头 数据从第二行开始写
for (Object ssTopModel : models) {
// 获取该类 并获取自身方法
Class clazz = ssTopModel.getClass();
for (int i = 0; i < annoFields.size(); i++) {
Field field = annoFields.get(i);
String methodName = "get"
+ field.getName().substring(0, 1).toUpperCase()
+ field.getName().substring(1);
Method method = clazz.getMethod(methodName);
try {
sheet.addCell(new Label(i, rowId, method
.invoke(ssTopModel) == null ? "" : method
.invoke(ssTopModel).toString(), wcf_center));
} catch (IllegalArgumentException e) {
e.printStackTrace();
} catch (IllegalAccessException e) {
e.printStackTrace();
} catch (InvocationTargetException e) {
e.printStackTrace();
}
}
rowId++;
}
workbook.write();
workbook.close();
os.flush();
os.close();
} catch (WriteException e) {
e.printStackTrace();
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
} catch (ClassNotFoundException e) {
e.printStackTrace();
} catch (SecurityException e) {
e.printStackTrace();
} catch (NoSuchMethodException e) {
e.printStackTrace();
}
}
}
第四，在需要导出成Excel的实体Bean字段上加注解，也许该类有许多字段，但只需要在需要导出的列上加上注解即可，如
@ExcelAnnotation(name="用户名",width=20,id=1)
private String userName;
第五，jxl最多一个sheet只能导出65535行，暂时未对行进行判断处理，数据太大导出会包异常，以后可以修改为对65535求余，余数即为需要创建的sheet数。