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【Java】 jxl导入导出Excel工具类
作者:泰鑫 / 发布于2015/7/20/ 548

	package cn.wawi.utils;
	
	import java.io.InputStream;
	import java.io.OutputStream;
	import java.text.SimpleDateFormat;
	import java.util.ArrayList;
	import java.util.Arrays;
	import java.util.Date;
	import java.util.LinkedHashMap;
	import java.util.List;
	import java.util.Map.Entry;
	import javax.servlet.http.HttpServletResponse;
	import jxl.Cell;
	import jxl.Sheet;
	import jxl.Workbook;
	import jxl.write.Label;
	import jxl.write.WritableSheet;
	import jxl.write.WritableWorkbook;
	
	/**
	* @author : 龚亮
	* @Date : 2015-4-27 上午9:13:21
	* @Comments : 导入导出Excel工具类
	* @Version : 1.0.0
	*/
	public class ExcelUtil {
	
	 /**
	 * 导出excel2003
	 * @param list 数据集合
	 * @param fieldMap 类的英文属性和Excel中的中文列名的对应关系
	 * @param sheetName 工作表的名称
	 * @param out 导出流
	 */
	 public static<T> void listToExcel(List<T> list,LinkedHashMap<String, String> fieldMap,String sheetName,OutputStream out) throws Exception{
	 if (list.size() == 0 || list == null) {
	 throw new Exception("数据源中没有任何数据");
	 }
	 int sheetSize=list.size();
	 if (sheetSize > 65535 || sheetSize < 1) {
	 sheetSize = 65535;
	 }
	 // 创建工作簿并发送到OutputStream指定的地方
	 WritableWorkbook wwb;
	 try {
	 wwb = Workbook.createWorkbook(out);
	 // 1.计算一共有多少个工作表
	 int sheetNum =list.size()%sheetSize==0?list.size()/sheetSize:(list.size()/sheetSize+1);
	 // 2.创建相应的工作表，并向其中填充数据
	 for (int i = 0; i < sheetNum; i++) {
	 // 如果只有一个工作表的情况
	 if (1 == sheetNum) {
	 WritableSheet sheet = wwb.createSheet(sheetName, i);
	 fillSheet(sheet, list, fieldMap, 0, list.size() - 1);
	 // 有多个工作表的情况
	 } else {
	 WritableSheet sheet = wwb.createSheet(sheetName + (i + 1),i);
	 // 获取开始索引和结束索引
	 int firstIndex = i * sheetSize;
	 int lastIndex = (i + 1) * sheetSize - 1 > list.size() - 1 ? list
	 .size() - 1 : (i + 1) * sheetSize - 1;
	 // 填充工作表
	 fillSheet(sheet, list, fieldMap, firstIndex, lastIndex);
	 }
	 }
	 wwb.write();
	 wwb.close();
	 } catch (Exception e) {
	 e.printStackTrace();
	 }
	 }
	 /**
	 * <---------------------list转excel--------------------->
	 * 导出到浏览器
	 */
	 public static <T> void listToExcel(List<T> list,LinkedHashMap<String, String> fieldMap, String sheetName,HttpServletResponse response) {
	
	 // 设置默认文件名为当前时间：年月日时分秒
	 String fileName = new SimpleDateFormat("yyyyMMddhhmmss").format(new Date()).toString();
	 // 设置response头信息
	 response.reset();
	 response.setContentType("application/vnd.ms-excel"); // 改成输出excel文件
	 response.setHeader("Content-disposition", "attachment; filename="+ fileName + ".xls");
	 // 创建工作簿并发送到浏览器
	 try {
	 OutputStream out = response.getOutputStream();
	 listToExcel(list, fieldMap, sheetName, out);
	 } catch (Exception e) {
	 e.printStackTrace();
	 }
	 }
	 //设置工作表自动列宽和首行加粗
	 private static void setColumnAutoSize(WritableSheet ws, int extraWith) {
	 // 获取本列的最宽单元格的宽度
	 for (int i = 0; i < ws.getColumns(); i++) {
	 int colWith = 0;
	 for (int j = 0; j < ws.getRows(); j++) {
	 String content = ws.getCell(i, j).getContents().toString();
	 int cellWith = content.length();
	 if (colWith < cellWith) {
	 colWith = cellWith;
	 }
	 }
	 // 设置单元格的宽度为最宽宽度+额外宽度
	 ws.setColumnView(i, colWith + extraWith);
	 }
	 }
	 /**
	 * @MethodName : excelToList
	 * @Description : 将Excel转化为List
	 * @param in : 输入流
	 * @param sheetIndex ：要导入的工作表序号
	 * @param entityClass ：实体class
	 * @param fieldMap ：Excel中的中文列头和类的英文属性的对应关系Map
	 */
	 public static <T> List<T> excelToList(InputStream in, String sheetName,Class<T> entityClass, LinkedHashMap<String, String> fieldMap) {
	 // 定义要返回的list
	 List<T> resultList = new ArrayList<T>();
	 try {
	 // 根据Excel数据源创建WorkBook
	 Workbook wb = Workbook.getWorkbook(in);
	 // 获取工作表
	 Sheet sheet = wb.getSheet(sheetName);
	 // 获取工作表的有效行数
	 int realRows = 0;
	 for (int i = 0; i < sheet.getRows(); i++) {
	
	 int nullCols = 0;
	 for (int j = 0; j < sheet.getColumns(); j++) {
	 Cell currentCell = sheet.getCell(j, i);
	 if (currentCell == null
	 || "".equals(currentCell.getContents().toString())) {
	 nullCols++;
	 }
	 }
	 if (nullCols == sheet.getColumns()) {
	 break;
	 } else {
	 realRows++;
	 }
	 }
	 // 如果Excel中没有数据则提示错误
	 if (realRows <= 1) {
	 throw new Exception("Excel文件中没有任何数据");
	 }
	 Cell[] firstRow = sheet.getRow(0);
	 String[] excelFieldNames = new String[firstRow.length];
	 // 获取Excel中的列名
	 for (int i = 0; i < firstRow.length; i++) {
	 excelFieldNames[i] = firstRow[i].getContents().toString().trim();
	 }
	 // 判断需要的字段在Excel中是否都存在
	 boolean isExist = true;
	 List<String> excelFieldList = Arrays.asList(excelFieldNames);
	 for (String cnName : fieldMap.keySet()) {
	 if (!excelFieldList.contains(cnName)) {
	 isExist = false;
	 break;
	 }
	 }
	 // 如果有列名不存在，则抛出异常，提示错误
	 if (!isExist) {
	 throw new Exception("Excel中缺少必要的字段，或字段名称有误");
	 }
	 // 将列名和列号放入Map中,这样通过列名就可以拿到列号
	 LinkedHashMap<String, Integer> colMap = new LinkedHashMap<String, Integer>();
	 for (int i = 0; i < excelFieldNames.length; i++) {
	 colMap.put(excelFieldNames[i], firstRow[i].getColumn());
	 }
	 // 将sheet转换为list
	 for (int i = 1; i < realRows; i++) {
	 // 新建要转换的对象
	 T entity = entityClass.newInstance();
	 // 给对象中的字段赋值
	 for (Entry<String, String> entry : fieldMap.entrySet()) {
	 // 获取中文字段名
	 String cnNormalName = entry.getKey();
	 // 获取英文字段名
	 String enNormalName = entry.getValue();
	 // 根据中文字段名获取列号
	 int col = colMap.get(cnNormalName);
	 // 获取当前单元格中的内容
	 String content = sheet.getCell(col, i).getContents().toString().trim();
	 ReflectUtil.setProperty(entity, enNormalName, content);
	 }
	 resultList.add(entity);
	 }
	 } catch (Exception e) {
	 e.printStackTrace();
	 }
	 return resultList;
	 }
	
	
	 //向工作表中填充数据
	 private static <T> void fillSheet(WritableSheet sheet, List<T> list,
	 LinkedHashMap<String, String> fieldMap, int firstIndex,int lastIndex) throws Exception {
	
	 // 定义存放英文字段名和中文字段名的数组
	 String[] enFields = new String[fieldMap.size()];
	 String[] cnFields = new String[fieldMap.size()];
	
	 // 填充数组
	 int count = 0;
	 for (Entry<String, String> entry : fieldMap.entrySet()) {
	 enFields[count] = entry.getKey();
	 cnFields[count] = entry.getValue();
	 count++;
	 }
	 // 填充表头
	 for (int i = 0; i < cnFields.length; i++) {
	 Label label = new Label(i, 0, cnFields[i]);
	 sheet.addCell(label);
	 }
	 // 填充内容
	 int rowNo = 1;
	 for (int index = firstIndex; index <= lastIndex; index++) {
	 // 获取单个对象
	 T item = list.get(index);
	 for (int i = 0; i < enFields.length; i++) {
	 Object objValue=null;
	 objValue=ReflectUtil.getNestedProperty(item, enFields[i]);
	 String fieldValue = objValue == null ? "" : objValue.toString();
	 Label label = new Label(i, rowNo, fieldValue);
	 sheet.addCell(label);
	 }
	 rowNo++;
	 }
	 // 设置自动列宽
	 setColumnAutoSize(sheet, 5);
	 }
	}

	

	

	ReflectUtil.java

	package cn.wawi.utils;
	
	import java.lang.reflect.Field;
	import java.lang.reflect.Modifier;
	import java.text.SimpleDateFormat;
	import java.util.ArrayList;
	import java.util.Date;
	import java.util.HashMap;
	import java.util.List;
	import java.util.Map;
	import org.apache.commons.beanutils.BeanUtils;
	import org.apache.commons.beanutils.ConvertUtils;
	import org.apache.commons.beanutils.converters.DateConverter;
	import org.junit.Test;
	import cn.wawi.entity.sys.Department;
	import cn.wawi.entity.sys.User;
	
	/**
	* @author : 龚亮
	* @Date : 2015-05-27 上午9:14:15
	* @Comments : 反射工具类
	* @Version : 1.0.0
	*/
	public class ReflectUtil {
	 @SuppressWarnings("all")
	 public static void main(String[] args) throws Exception {
	 User user = new User();
	 user.setUsername("miui");
	 user.setPhone("128379230948");
	 BeanUtils.setProperty(user, "password", "123456");
	 DateConverter converter = new DateConverter(null);
	 converter.setPattern("yyyy-MM-dd HH:mm:ss");
	 ConvertUtils.register(converter, Date.class);
	 ConvertUtils.register(converter, String.class);
	 BeanUtils.setProperty(user, "birthday", "2014-01-02 14:23:01");
	 String username = BeanUtils.getProperty(user, "username");
	 System.out.println(BeanUtils.getProperty(user, "birthday"));
	 User user1 = (User) BeanUtils.cloneBean(user); // 克隆bean
	 System.out.println(user1.getPassword());
	 Map<String, Object> map = BeanUtils.describe(user1);// bean转map
	 System.out.println(map.get("phone"));
	 Map<String, Object> map1 = new HashMap<String, Object>();
	 map1.put("phone", "3482394");
	 map1.put("birthday", new Date());
	 User user2 = new User();
	 BeanUtils.populate(user2, map1);// map转-bean
	 System.out.println(BeanUtils.getProperty(user2, "birthday"));
	 // BeanUtils.getNestedProperty(user2,"department.name");//获取bean嵌套值
	 }
	
	 @Test
	 public void test1() throws Exception {
	 User user = new User();
	 Department dept = new Department();
	 dept.setName("市场部");
	 setProperty(user, "department", dept);
	 setProperty(user, "username", "mini");
	 setProperty(user, "birthday", "2012-01-02 12:09:12");
	 setProperty(user, "inputTime", new Date());
	 System.out.println(getNestedProperty(user, "inputTime"));
	 setProperty(user, "id", 1);
	 System.out.println(user.getUsername());
	 System.out.println(user.getId());
	 System.out.println(getNestedProperty(user, "birthday"));
	 System.out.println(getNestedProperty(user, "department.name"));
	 }
	
	 /**
	 * @description 设置对象属性值
	 * @param obj
	 * 实体对象
	 * @param fieldName
	 * 属性名
	 * @param value
	 * 属性值
	 */
	 public static void setProperty(Object obj, String fieldName, Object value) {
	 try {
	 Field field = obj.getClass().getDeclaredField(fieldName);
	 if (field != null) {
	 Class<?> fieldType = field.getType();
	 field.setAccessible(true);
	 // 根据字段类型给字段赋值
	 if (String.class == fieldType) {
	 field.set(obj, String.valueOf(value));
	 } else if ((Integer.TYPE == fieldType)
	 || (Integer.class == fieldType)) {
	 field.set(obj, Integer.parseInt(value.toString()));
	 } else if ((Long.TYPE == fieldType)
	 || (Long.class == fieldType)) {
	 field.set(obj, Long.valueOf(value.toString()));
	 } else if ((Float.TYPE == fieldType)
	 || (Float.class == fieldType)) {
	 field.set(obj, Float.valueOf(value.toString()));
	 } else if ((Short.TYPE == fieldType)
	 || (Short.class == fieldType)) {
	 field.set(obj, Short.valueOf(value.toString()));
	 } else if ((Double.TYPE == fieldType)
	 || (Double.class == fieldType)) {
	 field.set(obj, Double.valueOf(value.toString()));
	 } else if (Character.TYPE == fieldType) {
	 if ((value != null) && (value.toString().length() > 0)) {
	 field.set(obj,
	 Character.valueOf(value.toString().charAt(0)));
	 }
	 } else if (Date.class == fieldType) {
	 if (value instanceof Date) {
	 field.set(obj, value);
	 } else if (value instanceof String) {
	 field.set(obj, new SimpleDateFormat(
	 "yyyy-MM-dd HH:mm:ss").parse(value.toString()));
	 }
	 } else {
	 field.set(obj, value);
	 }
	 field.setAccessible(false);
	 }
	 } catch (Exception e) {
	 e.getStackTrace();
	 }
	 }
	
	 /**
	 * @description 获取对象属性值
	 * @param obj
	 * 实体对象
	 * @param fieldName
	 * 属性名
	 * @param value
	 * 属性值
	 */
	 public static Object getProperty(Object obj, String fieldName) {
	 Field field = getFieldName(obj, fieldName);
	 Object value = null;
	 try {
	 if (field != null) {
	 Class<?> fieldType = field.getType();
	 field.setAccessible(true);
	 // 根据字段类型给字段赋值
	 if (Date.class == fieldType) {
	 Object o = field.get(obj);
	 if (o != null) {
	 value = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss")
	 .format(o);
	 }
	 } else {
	 value = field.get(obj);
	 }
	 field.setAccessible(false);
	 }
	 } catch (Exception e) {
	 e.printStackTrace();
	 }
	 return value;
	 }
	
	 // 获取department.name 属性值
	 public static Object getNestedProperty(Object obj, String fieldName) {
	 Object value = null;
	 String[] attributes = fieldName.split("\\.");
	 try {
	 value = getProperty(obj, attributes[0]);
	 for (int i = 1; i < attributes.length; i++) {
	 value = getProperty(value, attributes[i]);
	 }
	 } catch (Exception e) {
	 e.printStackTrace();
	 }
	 return value;
	 }
	
	 // 获取属性
	 public static Field getFieldName(Object obj, String fieldName) {
	 for (Class<?> superClass = obj.getClass(); superClass != Object.class; superClass = superClass
	 .getSuperclass()) {
	 try {
	 return superClass.getDeclaredField(fieldName);
	 } catch (NoSuchFieldException e) {
	 }
	 }
	 return null;
	 }
	
	 /**
	 * 获取对象所有字段的名字
	 * @param obj 目标对象
	 * @return 字段名字的数组
	 */
	 public static String[] getFieldNames(Object obj) {
	 Class<?> clazz = obj.getClass();
	 Field[] fields = clazz.getDeclaredFields();
	 List<String> fieldNames = new ArrayList<String>();
	 for (int i = 0; i < fields.length; i++) {
	 if ((fields[i].getModifiers() & Modifier.STATIC) == 0) {
	 fieldNames.add(fields[i].getName());
	 }
	 }
	 return fieldNames.toArray(new String[fieldNames.size()]);
	 }
	 public void say(String name){
	
	 }
	}
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