import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.lang.reflect.Field;
import java.lang.reflect.Method;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletResponse;
import org.apache.poi.hssf.usermodel.HSSFWorkbook;
import org.apache.poi.ss.usermodel.Cell;
import org.apache.poi.ss.usermodel.CellStyle;
import org.apache.poi.ss.usermodel.Font;
import org.apache.poi.ss.usermodel.IndexedColors;
import org.apache.poi.ss.usermodel.Row;
import org.apache.poi.ss.usermodel.Sheet;
import org.apache.poi.ss.usermodel.Workbook;
import com.dodo.reseller.domain.sys.supermarket.Supermarket;
import com.dodo.reseller.utils.ExclUtilPo;
/**
* 导出Excel文档工具类
*
* @author
* @date 2015-09-14
*/
public class ExcelUtil {
/**
* 创建excel文档,
*
* @param list
* 数据
* @param keys
* list中map的key数组集合
* @param columnNames
* excel的列名
*/
public static Workbook createWorkBook(List<Map<String, Object>> list, String[] keys, String columnNames[]) {
// 创建excel工作簿
Workbook wb = new HSSFWorkbook();
// 创建第一个sheet(页),并命名
Sheet sheet = wb.createSheet(list.get(0).get("sheetName").toString());
// 手动设置列宽。第一个参数表示要为第几列设;,第二个参数表示列的宽度,n为列高的像素数。
for (int i = 0; i < keys.length; i++) {
sheet.setColumnWidth((short) i, (short) (35.7 * 150));
}
// 创建第一行
Row row = sheet.createRow((short) 0);
row.setHeight((short) 500);
// 创建两种单元格格式
CellStyle cs = wb.createCellStyle();
CellStyle cs2 = wb.createCellStyle();
// 创建两种字体
Font f = wb.createFont();
Font f2 = wb.createFont();
// 创建第一种字体样式(用于列名)
f.setFontHeightInPoints((short) 10);
f.setColor(IndexedColors.BLACK.getIndex());
f.setBoldweight(Font.BOLDWEIGHT_BOLD);
// 创建第二种字体样式(用于值)
f2.setFontHeightInPoints((short) 10);
f2.setColor(IndexedColors.BLACK.getIndex());
// Font f3=wb.createFont();
// f3.setFontHeightInPoints((short) 10);
// f3.setColor(IndexedColors.RED.getIndex());
// 设置第一种单元格的样式(用于列名)
cs.setFont(f);
cs.setBorderLeft(CellStyle.BORDER_THIN);
cs.setBorderRight(CellStyle.BORDER_THIN);
cs.setBorderTop(CellStyle.BORDER_THIN);
cs.setBorderBottom(CellStyle.BORDER_THIN);
cs.setAlignment(CellStyle.ALIGN_CENTER);
// 设置第二种单元格的样式(用于值)
cs2.setFont(f2);
cs2.setBorderLeft(CellStyle.BORDER_THIN);
cs2.setBorderRight(CellStyle.BORDER_THIN);
cs2.setBorderTop(CellStyle.BORDER_THIN);
cs2.setBorderBottom(CellStyle.BORDER_THIN);
cs2.setAlignment(CellStyle.ALIGN_CENTER);
// 设置列名
for (int i = 0; i < columnNames.length; i++) {
Cell cell = row.createCell(i);
cell.setCellValue(columnNames[i]);
cell.setCellStyle(cs);
}
// 设置每行每列的值
for (short i = 1; i < list.size(); i++) {
// Row 行,Cell 方格 , Row 和 Cell 都是从0开始计数的
// 创建一行,在页sheet上
Row row1 = sheet.createRow((short) i);
// 在row行上创建一个方格
for (short j = 0; j < keys.length; j++) {
Cell cell = row1.createCell(j);
cell.setCellValue(list.get(i).get(keys[j]) == null ? " " : list.get(i).get(keys[j]).toString());
cell.setCellStyle(cs2);
}
}
return wb;
}
/**
* 封装最上层导出Excl方法
* @private List<Object> list;
* @private String[] keys;//参数字段
* @private String columnNames[];//列名称与参数keys对应
* @private String fileName;//生成的文件名称
* @private String sheetNameK="sheetName";
* @private String sheetNameV ="sheet1";
* @以上是必填字段
*
* @param exclUtilPo
* @param response
*/
public static void exportExcl(ExclUtilPo exclUtilPo, HttpServletResponse response) {
List<Map<String, Object>> list = createExcelRecord(exclUtilPo);
exclUtilPo.setListAndMap(list);
try {
exportExclFile(exclUtilPo, response);
} catch (IOException e) {
e.printStackTrace();
}
}
/**
* 把传递的list参数封装为List<Map<String, Object>>
*
* @param exclUtilPo
* @return
*/
private static List<Map<String, Object>> createExcelRecord(ExclUtilPo exclUtilPo) {
List<Map<String, Object>> listmap = new ArrayList<Map<String, Object>>();
Map<String, Object> map = new HashMap<String, Object>();
map.put(exclUtilPo.getSheetNameK(), exclUtilPo.getSheetNameV());
listmap.add(map);
List<Object> projects = exclUtilPo.getList();
int size = projects.size();
try {
if (projects != null && !projects.isEmpty()) {
for (int j = 0; j < size; j++) {
Map<String, Object> mapValue = new HashMap<String, Object>();
Object project = projects.get(j);
getProperty(project, mapValue);
listmap.add(mapValue);
}
}
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return listmap;
}
/**
* 获得一个对象各个属性的字节流
*/
@SuppressWarnings("unchecked")
public static void getProperty(Object entityName, Map<String, Object> mapValue) throws Exception {
Class c = entityName.getClass();
Field field[] = c.getDeclaredFields();
for (Field f : field) {
Object v = invokeMethod(entityName, f.getName(), null);
mapValue.put(f.getName(), v);
System.out.println(f.getName() + "\t" + v + "\t" + f.getType());
}
}
/**
* 获得对象属性的值
*/
@SuppressWarnings("unchecked")
private static Object invokeMethod(Object owner, String methodName, Object[] args) throws Exception {
Class ownerClass = owner.getClass();
methodName = methodName.substring(0, 1).toUpperCase() + methodName.substring(1);
Method method = null;
try {
method = ownerClass.getMethod("get" + methodName);
} catch (SecurityException e) {
} catch (NoSuchMethodException e) {
return " can't find 'get" + methodName + "' method";
}
return method.invoke(owner);
}
/**
* 使用流的方式生成Excl文件在页面导出
*
* @param exclUtilPo
* @param response
* @throws IOException
*/
public static void exportExclFile(ExclUtilPo exclUtilPo, HttpServletResponse response) throws IOException {
ByteArrayOutputStream os = new ByteArrayOutputStream();
try {
createWorkBook(exclUtilPo).write(os);
} catch (IOException e) {
e.printStackTrace();
}
byte[] content = os.toByteArray();
InputStream is = new ByteArrayInputStream(content);
// 设置response参数,可以打开下载页面
response.reset();
response.setContentType("application/vnd.ms-excel;charset=utf-8");
response.setHeader("Content-Disposition",
"attachment;filename=" + new String((exclUtilPo.getFileName() + ".xls").getBytes(), "iso-8859-1"));
ServletOutputStream out = response.getOutputStream();
BufferedInputStream bis = null;
BufferedOutputStream bos = null;
try {
bis = new BufferedInputStream(is);
bos = new BufferedOutputStream(out);
byte[] buff = new byte[2048];
int bytesRead;
// Simple read/write loop.
while (-1 != (bytesRead = bis.read(buff, 0, buff.length))) {
bos.write(buff, 0, bytesRead);
}
} catch (final IOException e) {
throw e;
} finally {
if (bis != null)
bis.close();
if (bos != null)
bos.close();
bos.flush();
}
}
/**
* 创建excel文档,
*
* @param list
* 数据
* @param keys
* list中map的key数组集合
* @param columnNames
* excel的列名
*/
public static Workbook createWorkBook(ExclUtilPo exclUtilPo) {
// 创建excel工作簿
Workbook wb = new HSSFWorkbook();
// 创建第一个sheet(页),并命名
Sheet sheet = wb.createSheet(exclUtilPo.getListAndMap().get(0).get(exclUtilPo.getSheetNameK()).toString());
// 手动设置列宽。第一个参数表示要为第几列设;,第二个参数表示列的宽度,n为列高的像素数。
String[] keys = exclUtilPo.getKeys();
int keyslength = keys.length;
for (int i = 0; i < keyslength; i++) {
sheet.setColumnWidth((short) i, (short) (35.7 * 150));
}
// 创建第一行
Row row = sheet.createRow((short) 0);
row.setHeight((short) 500);
// 创建两种单元格格式
CellStyle cs = wb.createCellStyle();
CellStyle cs2 = wb.createCellStyle();
// 创建两种字体
Font f = wb.createFont();
Font f2 = wb.createFont();
// 创建第一种字体样式(用于列名)
f.setFontHeightInPoints((short) 10);
f.setColor(IndexedColors.BLACK.getIndex());
f.setBoldweight(Font.BOLDWEIGHT_BOLD);
// 创建第二种字体样式(用于值)
f2.setFontHeightInPoints((short) 10);
f2.setColor(IndexedColors.BLACK.getIndex());
// Font f3=wb.createFont();
// f3.setFontHeightInPoints((short) 10);
// f3.setColor(IndexedColors.RED.getIndex());
// 设置第一种单元格的样式(用于列名)
cs.setFont(f);
cs.setBorderLeft(CellStyle.BORDER_THIN);
cs.setBorderRight(CellStyle.BORDER_THIN);
cs.setBorderTop(CellStyle.BORDER_THIN);
cs.setBorderBottom(CellStyle.BORDER_THIN);
cs.setAlignment(CellStyle.ALIGN_CENTER);
// 设置第二种单元格的样式(用于值)
cs2.setFont(f2);
cs2.setBorderLeft(CellStyle.BORDER_THIN);
cs2.setBorderRight(CellStyle.BORDER_THIN);
cs2.setBorderTop(CellStyle.BORDER_THIN);
cs2.setBorderBottom(CellStyle.BORDER_THIN);
cs2.setAlignment(CellStyle.ALIGN_CENTER);
// 设置列名
String[] columnNames = exclUtilPo.getColumnNames();
int columnNameslength = columnNames.length;
for (int i = 0; i < columnNameslength; i++) {
Cell cell = row.createCell(i);
cell.setCellValue(columnNames[i]);
cell.setCellStyle(cs);
}
// 设置每行每列的值
List<Map<String, Object>> listAndMap = exclUtilPo.getListAndMap();
int listAndMapSize = listAndMap.size();
for (short i = 1; i < listAndMapSize; i++) {
// Row 行,Cell 方格 , Row 和 Cell 都是从0开始计数的
// 创建一行,在页sheet上
Row row1 = sheet.createRow((short) i);
// 在row行上创建一个方格
for (short j = 0; j < keys.length; j++) {
Cell cell = row1.createCell(j);
cell.setCellValue(
listAndMap.get(i).get(keys[j]) == null ? " " : listAndMap.get(i).get(keys[j]).toString());
cell.setCellStyle(cs2);
}
}
return wb;
}
}