Java 通过Xml导出Excel文件，Java Excel 导出工具类，Java导出Excel工具类

import java.io.IOException;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.math.BigDecimal;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.List;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

import javax.servlet.ServletOutputStream;

import org.apache.commons.lang.StringUtils;

public class ExportUtil {

	/**
	 * 只导出包含在includeFieldNames中的属性
	 * @param sheetName 表格左下角的名称
	 * @param firstRowTitle 第一行需要设置的title，为空则不设置
	 * @param list 需要显示的数据集合
	 * @param headers 表格属性列名数组
	 * @param includeFieldNames 包含的实体属性
	 * @param widths 列的宽度，不设置（为Null）则默认，设置则根据对应的列宽设置（可以是一个，可以是对应的数量，整形数字，如200）
	 * @param outputStream 与输出设备关联的流对象，可以将EXCEL文档导出到本地文件或者网络中
	 * @param datetimePattern 时间形式，当为空（Null或空字符串）时默认为yyyy-MM-dd HH:mm:ss
	 * @throws Exception
	 */
	@SuppressWarnings({ "unchecked", "rawtypes" })
	public <T> void exportExcel(String sheetName, String firstRowTitle, List<T> list, String[] headers, String[] includeFieldNames, Integer[] widths,
			ServletOutputStream outputStream, String datetimePattern) throws Exception {
		
		// 默认输出格式
		if (StringUtils.isBlank(datetimePattern)) {
			datetimePattern = "yyyy-MM-dd HH:mm:ss";
		}
		
		// 创建一个excel应用文件
		StringBuffer sb = new StringBuffer();
		sb.append("<?xml version=\"1.0\"?>");
		sb.append("\n");
		sb.append("<?mso-application progid=\"Excel.Sheet\"?>");
		sb.append("\n");
		sb.append("<Workbook xmlns=\"urn:schemas-microsoft-com:office:spreadsheet\"");
		sb.append("\n");
		sb.append(" xmlns:o=\"urn:schemas-microsoft-com:office:office\"");
		sb.append("\n");
		sb.append(" xmlns:x=\"urn:schemas-microsoft-com:office:excel\"");
		sb.append("\n");
		sb.append(" xmlns:ss=\"urn:schemas-microsoft-com:office:spreadsheet\"");
		sb.append("\n");
		sb.append(" xmlns:html=\"http://www.w3.org/TR/REC-html40\">");
		sb.append("\n");
		
		sb.append("<Styles>\n");
		
		/*设置列头样式*/
		sb.append("<Style ss:ID=\"header\" ss:Name=\"header\">\n");//ss:ID=“header”对应下面的Row ss:StyleID=“header”
		sb.append("<Interior ss:Color=\"#c4d79b\" ss:Pattern=\"Solid\"/>\n");// 设置背景颜色
		sb.append("<Font ss:FontName=\"微软雅黑\" x:CharSet=\"134\" ss:Bold=\"Bolder\" ss:Size=\"12\"/>\n");//设置字体
		sb.append("</Style>\n");
		
		/*其它默认样式设置*/
		sb.append("<Style ss:ID=\"Default\" ss:Name=\"Normal\">\n");
		//sb.append("<Alignment ss:Vertical=\"Center\"/>\n");
		sb.append("<Alignment ss:Horizontal=\"Center\" ss:Vertical=\"Center\" ss:WrapText=\"1\"/>\n");// 左中右设置，一个是水平，一个是垂直
		sb.append("<Borders>\n");
		sb.append("<Border ss:Position=\"Left\" ss:LineStyle=\"Continuous\" ss:Color=\"#666\" ss:Weight=\"1\"/>\n");//左边框设置
		sb.append("<Border ss:Position=\"Right\" ss:LineStyle=\"Continuous\" ss:Color=\"#666\" ss:Weight=\"1\"/>\n");//右边框设置
		sb.append("<Border ss:Position=\"Bottom\" ss:LineStyle=\"Continuous\" ss:Color=\"#666\" ss:Weight=\"1\"/>\n");//下边框设置
		sb.append("<Border ss:Position=\"Top\" ss:LineStyle=\"Continuous\" ss:Color=\"#666\" ss:Weight=\"1\"/>\n");//上边框设置
		sb.append("</Borders>\n");
		sb.append("<Font ss:FontName=\"宋体\" x:CharSet=\"134\" ss:Size=\"12\"/>\n");
		sb.append("<Interior/>\n");
		sb.append("<NumberFormat/>\n");
		sb.append("<Protection/>\n");
		sb.append("</Style>\n");
		
		sb.append("</Styles>\n");
		
		try {
			
			// 生成表格
			int headersLength = headers.length;
			
			sb.append("<Worksheet ss:Name=\"" + sheetName + "\">");
			sb.append("\n");
			sb.append("<Table ss:ExpandedColumnCount=\"" + headersLength
					+ "\" ss:ExpandedRowCount=\"1000000\" x:FullColumns=\"1\" x:FullRows=\"1\">");
			sb.append("\n");
			
			if(!StrUtils.isEmptyArray(widths)){
				if(widths.length > 1){
					for (int i = 0; i < headersLength; i++) {
						sb.append("<Column ss:AutoFitWidth=\"0\" ss:Width=\""+widths[i]+"\"/>");
					}
				}else{
					for (int i = 0; i < headersLength; i++) {
						sb.append("<Column ss:AutoFitWidth=\"0\" ss:Width=\""+widths[0]+"\"/>");
					}
				}
			}
			
			
			// 输出第一行的标题
			if(!StrUtils.isBlank(firstRowTitle)){
				//ss:StyleID可以加row或者Cell，加在Row，整行（包括空的Cell）都有，加上Cell，只有Cell才有。
				sb.append("<Row  ss:Height=\"30\">");
				sb.append("<Cell ss:StyleID=\"header\" ss:MergeAcross=\""+ (headersLength - 1)+"\"><Data ss:Type=\"String\">" + firstRowTitle + "</Data></Cell>");
				sb.append("</Row>");
			}
			
			// 输出列头
			sb.append("<Row>");
			for (int i = 0; i < headersLength; i++) {
				sb.append("<Cell ss:StyleID=\"header\"><Data ss:Type=\"String\">" + headers[i] + "</Data></Cell>");
			}
			sb.append("</Row>");
			
			// 构建表体数据
			for (int j = 0; j < list.size(); j++) {
				
				sb.append("<Row>");
				
				T t = (T) list.get(j);
				
				for (int i = 0; i < includeFieldNames.length; i++) {
					
					// 获取属性名称
					String fieldName = includeFieldNames[i];
					
					String getMethodName = "get" + fieldName.substring(0, 1).toUpperCase() + fieldName.substring(1);
					
					// 获取class对象
					Class tCls = t.getClass();
					
					// 获取属性值
					Object value = null;
					
					try {
						// 获取class方法
						Method getMethod = tCls.getMethod(getMethodName, new Class[] {});
						
						// 获取属性值
						value = getMethod.invoke(t, new Object[] {});
						
					} catch (NoSuchMethodException e) {
						// 继续循环
						continue;
					}
					
					// 判断值的类型后进行强制类型转换
					String textValue = "";
					if (value instanceof Integer) {
						// int value = ((Integer) value).intValue();
						textValue = value.toString();
					} else if (value instanceof String) {
						// String s = (String) value;
						textValue = value.toString();
					} else if (value instanceof Double) {
						// double d = ((Double) value).doubleValue();
						textValue = String.format("%.2f", value);
					} else if (value instanceof Float) {
						// float f = ((Float) value).floatValue();
						textValue = value.toString();
					} else if (value instanceof Long) {
						// long l = ((Long) value).longValue();
						textValue = value.toString();
					} else if (value instanceof Boolean) {
						// boolean b = ((Boolean) value).booleanValue();
						textValue = value.toString();
					} else if (value instanceof Date) {
						Date date = (Date) value;
						SimpleDateFormat sdf = new SimpleDateFormat(datetimePattern);
						textValue = sdf.format(date);
					} else if ((value instanceof BigDecimal)) {
						textValue = value.toString();
					} else {
						if (value != null) {
							continue;
						}
					}
					
					sb.append("<Cell><Data ss:Type=\"String\">");
					
					// 如果不是图片数据，就利用正则表达式判断textValue是否全部由数字组成
					if (StringUtils.isNotBlank(textValue)) {
						
						Pattern p = Pattern.compile("^//d+(//.//d+)?$");
						Matcher matcher = p.matcher(textValue);
						if (matcher.matches()) {
							// 是数字当作double处理
							sb.append(Double.parseDouble(textValue));
						} else {
							sb.append(textValue);
						}
						
					}
					
					sb.append("</Data></Cell>");
					
				}
				
				sb.append("</Row>");
				sb.append("\n");
				
			}
			
			sb.append("</Table>");
			sb.append("<WorksheetOptions xmlns=\"urn:schemas-microsoft-com:office:excel\">");
			sb.append("\n");
			sb.append("<ProtectObjects>False</ProtectObjects>");
			sb.append("\n");
			sb.append("<ProtectScenarios>False</ProtectScenarios>");
			sb.append("\n");
			sb.append("</WorksheetOptions>");
			sb.append("\n");
			sb.append("</Worksheet>");
			sb.append("</Workbook>");
			sb.append("\n");
			
		} catch (SecurityException e) {
			e.printStackTrace();
		} catch (IllegalArgumentException e) {
			e.printStackTrace();
		} catch (IllegalAccessException e) {
			e.printStackTrace();
		} catch (InvocationTargetException e) {
			e.printStackTrace();
		}
		
		try {
			outputStream.write(sb.toString().getBytes());
			outputStream.flush();
			outputStream.close();
			sb = null;
		} catch (IOException e) {
			e.printStackTrace();
		} finally {
			try {
				outputStream.close();
			} catch (IOException e) {
				e.printStackTrace();
			}
		}
	}

	

}