1.自定義註解
import java.lang.annotation.ElementType;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.annotation.Target;
/**
* Created by weili on 2017/7/24.
*/
@Retention(RetentionPolicy.RUNTIME)
@Target({ElementType.FIELD,ElementType.TYPE})
public @interface ExcelAttribute {
/**
* excel裏的sheet名，默認是"sheet1"
* @return
*/
String sheetName() default "sheet1";
/**
* excel裏對應的列名，默認爲""
* @return
*/
String columnName() default "";
/**
* 列對應的排序序號，默認是0
* @return
*/
int order() default 0;
enum DataType {
String, Number, Date
}
/**
* 數據類型，可以是String，Number(數字型)，Date等類型
* @return
*/
DataType type() default DataType.String;
/**
* 日期格式，默認是"yyyy-MM-dd HH:mm:ss"
* @return
*/
String datePattern() default "yyyyMMdd HH:mm:ss";
/**
* 保留小數點後的位數，默認是0
* @return
*/
int decimalNums() default 0;
/**
* 背景顏色,默認爲白色"FFFFFF"，
* 表示形式爲顏色的十六進制字符串，常見的：
* red: "FF0000",Orange: "FFA500",yellow: "FFFF00",
* green: "008000",blue: "0000FF",purple: "800080"
* @return
*/
String fillColor() default "FFFFFF";
/**
* 字段是否放棄存儲到excel裏，默認爲false
* @return
*/
boolean skip() default false;
}
import com.creditease.microloan.mil.tasks.common.annotation.ExcelAttribute;
import com.creditease.microloan.mil.tasks.exceptions.BusinessRuntimeException;
import org.apache.commons.beanutils.BeanUtils;
import org.apache.poi.ss.usermodel.*;
import org.apache.poi.xssf.streaming.SXSSFSheet;
import org.apache.poi.xssf.streaming.SXSSFWorkbook;
import org.apache.poi.xssf.usermodel.XSSFCellStyle;
import org.apache.poi.xssf.usermodel.XSSFColor;
import org.springframework.stereotype.Component;
import org.springframework.util.CollectionUtils;
import java.awt.Color;
import java.io.FileOutputStream;
import java.lang.reflect.Field;
import java.text.DateFormat;
import java.text.DecimalFormat;
import java.text.SimpleDateFormat;
import java.util.*;
import java.util.List;
/**
* Created byweili on 2017/7/20.
*/
@Component
public class ExcelUtil<T> {
/**
* 根據filePath和dataset創建文件
* @param filePath
* @param dataset
* @param <T>
*/
public static <T> void createFile(String filePath, List<T> dataset) {
SXSSFWorkbook wb = new SXSSFWorkbook();
createExcel( wb, dataset);
FileOutputStream out = null;
try {
out = new FileOutputStream(filePath);
wb.write(out);
}
catch (Exception e){
throw new BusinessRuntimeException("文件創建失敗！",e);
}
finally {
if(out!=null) {
try {
out.close();
}
catch (Exception e){
throw new BusinessRuntimeException("關閉文件輸出流失敗！",e);
}
}
}
}
/**
* 創建sheet，並添加數據到裏面
* @param wb
* @param dataset
* @param <T>
*/
private static <T> void createExcel(SXSSFWorkbook wb, List<T> dataset ) {
if(CollectionUtils.isEmpty(dataset) ) {
return;
}
T t = dataset.get(0);
// 獲取實體類的所有屬性,即包括public、private和proteced，但是不包括父類的申明字段
// 一個field表示一個屬性
Field[] fields = t.getClass().getDeclaredFields();
// 整個類的註解,得到了定義的sheetName
ExcelAttribute classAttribute = t.getClass().getAnnotation(ExcelAttribute.class);
SXSSFSheet sheet = wb.createSheet(classAttribute.sheetName());
// excel裏存儲類的部分屬性和順序號
Map<Field,Integer> map = new LinkedHashMap<>();
ExcelAttribute excelAttribute = null;
for (Field field : fields) {
// 某個屬性上的註解,如果沒寫註解或者註解裏的skip爲true，表示該列不會存儲到excel裏
excelAttribute = field.getAnnotation(ExcelAttribute.class);
if (excelAttribute != null) {
if (!excelAttribute.skip()) {
map.put(field, excelAttribute.order());
}
}
}
// 排序
List<Map.Entry<Field,Integer>> list = new ArrayList<Map.Entry<Field,Integer>>(map.entrySet());
Collections.sort(list, (o1, o2) -> o1.getValue().compareTo(o2.getValue()));
// 存儲類的註解skip爲false的排序後的屬性對應的Field
List<Field> excelFields = new ArrayList<>();
for(Map.Entry<Field,Integer> mapping:list){
excelFields.add(mapping.getKey());
}
// excel裏存儲的列的ExcelAttribute
List<ExcelAttribute> attributes = new ArrayList<>();
for (int j = 0; j < excelFields.size(); j++) {
attributes.add(excelFields.get(j).getAnnotation(ExcelAttribute.class));
}
addDataToExcel(wb,dataset,excelFields, attributes,sheet);
// 自動調整列寬
sheet.trackAllColumnsForAutoSizing();
for(int i=0;i<excelFields.size();i++) {
sheet.autoSizeColumn(i);
}
}
/**
* 添加數據到excel中
* @param wb
* @param dataset
* @param excelFields
* @param attributes
* @param sheet
* @param <T>
*/
private static <T> void addDataToExcel(SXSSFWorkbook wb, List<T> dataset,List<Field> excelFields, List<ExcelAttribute> attributes,Sheet sheet) {
XSSFCellStyle style = (XSSFCellStyle)wb.createCellStyle();
// 居中
style.setAlignment(HorizontalAlignment.CENTER);
style.setVerticalAlignment(VerticalAlignment.CENTER);
// excel放入第一行列的名稱
Row row = sheet.createRow(0);
for (int j = 0; j < excelFields.size(); j++) {
Cell cell = row.createCell(j);
ExcelAttribute oneAttribute = attributes.get(j);
cell.setCellValue(oneAttribute.columnName());
cell.setCellStyle(style);
}
// 添加數據到excel
for(int i=0;i<dataset.size();i++) {
// 數據行號從1開始,因爲第0行放的是列的名稱
row = sheet.createRow(i+1);
for(int j=0;j<attributes.size();j++) {
Cell cell = row.createCell(j);
ExcelAttribute oneAttribute = attributes.get(j);
style = (XSSFCellStyle)wb.createCellStyle();
// 居中
style.setAlignment(HorizontalAlignment.CENTER);
style.setVerticalAlignment(VerticalAlignment.CENTER);
// 填充色
XSSFColor myColor = new XSSFColor(toColorFromString(oneAttribute.fillColor()));
style.setFillPattern(FillPatternType.SOLID_FOREGROUND);
style.setFillForegroundColor(myColor);
// 四個邊框
style.setBorderBottom(BorderStyle.THIN);
style.setBorderLeft(BorderStyle.THIN);
style.setBorderRight(BorderStyle.THIN);
style.setBorderTop(BorderStyle.THIN);
cell.setCellStyle(style);
try{
// 根據屬性名獲取屬性值
String cellValue = BeanUtils.getProperty( dataset.get(i), excelFields.get(j).getName());
if(ExcelAttribute.DataType.Date.equals(oneAttribute.type()))
{
// CST格式的時間字符串轉爲Date對象
String CST_FORMAT = "EEE MMM dd HH:mm:ss z yyyy";
Date cstDate = new SimpleDateFormat(CST_FORMAT, Locale.US).parse(cellValue);
DateFormat df = new SimpleDateFormat(
oneAttribute.datePattern());
cell.setCellValue( df.format(cstDate) );
}
else if(ExcelAttribute.DataType.Number.equals(oneAttribute.type())) {
// 保留小數點後的位數
int decimalNums = oneAttribute.decimalNums();
StringBuilder format = new StringBuilder("#0");
for(int w=0;w<decimalNums;w++) {
if(w==0) {
format.append(".");
}
format.append("0");
}
cell.setCellValue(String.valueOf(new DecimalFormat(format.toString()).format(Double.parseDouble(cellValue))));
}
else {
cell.setCellValue(cellValue);
}
}
catch (Exception e) {
throw new BusinessRuntimeException("獲取類的屬性值失敗！", e);
}
}
}
}
/**
* 顏色的16進制字符串轉換成Color對象
* @param colorStr 例如藍色爲"0000FF"
* @return Color對象
* */
private static Color toColorFromString(String colorStr){
Color color = new Color(Integer.parseInt(colorStr, 16)) ;
return color;
}
}
import com.creditease.microloan.mil.tasks.common.annotation.ExcelAttribute;
import lombok.AllArgsConstructor;
import lombok.Data;
import java.util.Date;
/**
* Created by weili on 2017/7/20.
*/
@Data
@AllArgsConstructor
@ExcelAttribute(sheetName = "stuSheet")
public class Stu {
@ExcelAttribute(columnName="學號",order=0,fillColor = "FF0000")
private Integer stuNo;
@ExcelAttribute(columnName="姓名",order=2,skip = true)
private String name;
@ExcelAttribute(columnName="成績",order=5, type = ExcelAttribute.DataType.Number,decimalNums = 4)
private Double grade;
@ExcelAttribute(columnName="註冊時間",order=0,datePattern = "yyyy-MM-dd HH:mm",type = ExcelAttribute.DataType.Date)
private Date loginDate;
@ExcelAttribute(columnName="是否男孩",order=4,fillColor = "FFFF00")
private Boolean isBoy;
}
package com.creditease.microloan.mil.tasks;
import com.creditease.microloan.mil.tasks.model.Stu;
import com.creditease.microloan.mil.tasks.util.ExcelUtil;
import org.junit.Test;
import java.util.ArrayList;
import java.util.Date;
import java.util.List;
/**
* Created by weili on 2017/7/20.
*/
public class ExcelUtilTest {
@Test
public void test() {
List<Stu> dataset = new ArrayList<>();
dataset.add(new Stu(1,"zhangsan",67.9990,new Date(),true));
dataset.add(new Stu(2,"lisi",0.03,new Date(),false));
String[] fieldColumns ={"number","sname"};
String sheetName ="ss33";
String path = "/Users/apple/Desktop/11.xlsx";
ExcelUtil.createFile(path,dataset);
}
}