工具类：
import java.io.*;
import java.lang.reflect.*;
import java.util.*;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
import java.text.SimpleDateFormat;
import org.apache.poi.hssf.usermodel.*;
import org.apache.poi.hssf.util.HSSFColor;
import org.apache.poi.ss.util.CellRangeAddress;
public class ExportExcel {
/**
* 功能: 导出为Excel工作簿
* 参数: sheetName[工作簿中的一张工作表的名称]
* 参数: titleName[表格的标题名称]
* 参数: headers[表格每一列的列名]
* 参数: dataSet[要导出的数据源]
* 参数: resultUrl[导出的excel文件地址]
* 参数: pattern[时间类型数据的格式]
*/
public static void exportExcel(String sheetName,String titleName,String[] headers,Collection<?> dataSet,String resultUrl,String pattern) {
doExportExcel(sheetName,titleName,headers,dataSet,resultUrl,pattern);
}
/**
* 功能:真正实现导出
*/
private static void doExportExcel(String sheetName,String titleName,String[] headers,Collection<?> dataSet,String resultUrl,String pattern) {
// 声明一个工作薄
HSSFWorkbook workbook = new HSSFWorkbook();
// 生成一个工作表
HSSFSheet sheet = workbook.createSheet(sheetName);
// 设置工作表默认列宽度为20个字节
sheet.setDefaultColumnWidth((short) 20);
//在工作表中合并首行并居中
sheet.addMergedRegion(new CellRangeAddress(0,0,0,headers.length-1));
// 创建[标题]样式
HSSFCellStyle titleStyle = workbook.createCellStyle();
// 设置[标题]样式
titleStyle.setFillForegroundColor(HSSFColor.LIGHT_BLUE.index);
titleStyle.setFillPattern(HSSFCellStyle.SOLID_FOREGROUND);
titleStyle.setBorderBottom(HSSFCellStyle.BORDER_THIN);
titleStyle.setBorderLeft(HSSFCellStyle.BORDER_THIN);
titleStyle.setBorderRight(HSSFCellStyle.BORDER_THIN);
titleStyle.setBorderTop(HSSFCellStyle.BORDER_THIN);
titleStyle.setAlignment(HSSFCellStyle.ALIGN_CENTER);
//创建[标题]字体
HSSFFont titleFont = workbook.createFont();
//设置[标题]字体
titleFont.setColor(HSSFColor.WHITE.index);
titleFont.setFontHeightInPoints((short) 24);
titleFont.setBoldweight(HSSFFont.BOLDWEIGHT_BOLD);
// 把[标题字体]应用到[标题样式]
titleStyle.setFont(titleFont);
// 创建[列首]样式
HSSFCellStyle headersStyle = workbook.createCellStyle();
// 设置[列首]样式
headersStyle.setFillForegroundColor(HSSFColor.LIGHT_ORANGE.index);
headersStyle.setFillPattern(HSSFCellStyle.SOLID_FOREGROUND);
headersStyle.setBorderBottom(HSSFCellStyle.BORDER_THIN);
headersStyle.setBorderLeft(HSSFCellStyle.BORDER_THIN);
headersStyle.setBorderRight(HSSFCellStyle.BORDER_THIN);
headersStyle.setBorderTop(HSSFCellStyle.BORDER_THIN);
headersStyle.setAlignment(HSSFCellStyle.ALIGN_CENTER);
//创建[列首]字体
HSSFFont headersFont = workbook.createFont();
//设置[列首]字体
headersFont.setColor(HSSFColor.VIOLET.index);
headersFont.setFontHeightInPoints((short) 12);
headersFont.setBoldweight(HSSFFont.BOLDWEIGHT_BOLD);
// 把[列首字体]应用到[列首样式]
headersStyle.setFont(headersFont);
// 创建[表中数据]样式
HSSFCellStyle dataSetStyle = workbook.createCellStyle();
// 设置[表中数据]样式
dataSetStyle.setFillForegroundColor(HSSFColor.GOLD.index);
dataSetStyle.setFillPattern(HSSFCellStyle.SOLID_FOREGROUND);
dataSetStyle.setBorderBottom(HSSFCellStyle.BORDER_THIN);
dataSetStyle.setBorderLeft(HSSFCellStyle.BORDER_THIN);
dataSetStyle.setBorderRight(HSSFCellStyle.BORDER_THIN);
dataSetStyle.setBorderTop(HSSFCellStyle.BORDER_THIN);
dataSetStyle.setAlignment(HSSFCellStyle.ALIGN_CENTER);
dataSetStyle.setVerticalAlignment(HSSFCellStyle.VERTICAL_CENTER);
// 创建[表中数据]字体
HSSFFont dataSetFont = workbook.createFont();
// 设置[表中数据]字体
dataSetFont.setBoldweight(HSSFFont.BOLDWEIGHT_NORMAL);
dataSetFont.setColor(HSSFColor.BLUE.index);
// 把[表中数据字体]应用到[表中数据样式]
dataSetStyle.setFont(dataSetFont);
//创建标题行-增加样式-赋值
HSSFRow titleRow = sheet.createRow(0);
HSSFCell titleCell = titleRow.createCell(0);
titleCell.setCellStyle(titleStyle);
titleCell.setCellValue(titleName);
// 创建列首-增加样式-赋值
HSSFRow row = sheet.createRow(1);
for (short i = 0; i < headers.length; i++) {
@SuppressWarnings("deprecation")
HSSFCell cell = row.createCell(i);
cell.setCellStyle(headersStyle);
HSSFRichTextString text = new HSSFRichTextString(headers[i]);
cell.setCellValue(text);
}
// 创建表中数据行-增加样式-赋值
Iterator<?> it = dataSet.iterator();
int index = 1;
while (it.hasNext()) {
index++;
row = sheet.createRow(index);
Object t = it.next();
// 利用反射，根据javabean属性的先后顺序，动态调用getXxx()方法得到属性值
Field[] fields = t.getClass().getDeclaredFields();
for (short i = 0; i < fields.length; i++) {
@SuppressWarnings("deprecation")
HSSFCell cell = row.createCell(i);
cell.setCellStyle(dataSetStyle);
Field field = fields[i];
String fieldName = field.getName();
String getMethodName = "get"+ fieldName.substring(0, 1).toUpperCase()+ fieldName.substring(1);
try {
@SuppressWarnings("rawtypes")
Class tCls = t.getClass();
@SuppressWarnings("unchecked")
Method getMethod = tCls.getMethod(getMethodName,new Class[] {});
Object value = getMethod.invoke(t, new Object[] {});
// 如果是时间类型,按照格式转换
String textValue = null;
if (value instanceof Date) {
Date date = (Date) value;
SimpleDateFormat sdf = new SimpleDateFormat(pattern);
textValue = sdf.format(date);
} else {
// 其它数据类型都当作字符串简单处理
textValue = value.toString();
}
// 利用正则表达式判断textValue是否全部由数字组成
if (textValue != null) {
Pattern p = Pattern.compile("^\\d+(\\.\\d+)?$");
Matcher matcher = p.matcher(textValue);
if (matcher.matches()) {
// 是数字当作double处理
cell.setCellValue(Double.parseDouble(textValue));
} else {
// 不是数字做普通处理
cell.setCellValue(textValue);
}
}
OutputStream out=null;
try {
out = new FileOutputStream(resultUrl);
workbook.write(out);
} catch (IOException e) {
e.printStackTrace();
}finally{
try {
out.close();
} catch (IOException e) {
e.printStackTrace();
}
}
} catch (SecurityException e) {
e.printStackTrace();
} catch (NoSuchMethodException e) {
e.printStackTrace();
} catch (IllegalArgumentException e) {
e.printStackTrace();
} catch (IllegalAccessException e) {
e.printStackTrace();
} catch (InvocationTargetException e) {
e.printStackTrace();
} finally {
//清理资源
try {
workbook.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
}
}
}
测试类：
@Test
public void tet(){
String sheetName="repayment";
String titleName="repayment";
String[] headers = { "SqlNo", "ALoan_no", "term_no", "Application_no","PeriodSupply","Principal","Interest","Surplus_principal","EffectiveState","isRepaid","repayment_date" };
//List<Book> dataSet = service.selectBookList();
List<Repayment> queryall = repaymentMapper.queryall();
String resultUrl="E:\\test1.xls";
String pattern="yyyy-MM-dd";
ExportExcel.exportExcel(sheetName, titleName, headers, queryall, resultUrl, pattern);
}
controller层代码
@ResponseBody
@RequestMapping("/export")
public String save() throws Exception
{
String sheetName="repayment";
String titleName="repayment";
String[] headers = { "SqlNo", "ALoan_no", "term_no", "Application_no","PeriodSupply","Principal","Interest","Surplus_principal","EffectiveState","isRepaid","repayment_date" };
//List<Book> dataSet = service.selectBookList();
List<Repayment> queryall = repaymentMapper.queryall();
String resultUrl="E:\\book1.xls";
String pattern="yyyy-MM-dd";
ExportExcel.exportExcel(sheetName, titleName, headers, queryall, resultUrl, pattern);
return "success";
}