package com.at21.gpd.action;
import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.URLEncoder;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import javax.servlet.http.HttpServletResponse;
import org.apache.poi.xssf.usermodel.XSSFCell;
import org.apache.poi.xssf.usermodel.XSSFRow;
import org.apache.poi.xssf.usermodel.XSSFSheet;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;
import org.apache.struts2.ServletActionContext;
import com.at21.base.action.BaseAction;
import com.at21.gpd.service.IExportService;
public class ExportExcelAction extends BaseAction {
/**
*
*/
private static final long serialVersionUID = 1L;
/**
* 生成excel并下载
*/
public void exportExcel() {
File newFile = createNewFile();
// File newFile = new File("d:/ss.xls");
// 新文件写入数据，并下载*****************************************************
InputStream is = null;
XSSFWorkbook workbook = null;
XSSFSheet sheet = null;
try {
is = new FileInputStream(newFile);// 将excel文件转为输入流
workbook = new XSSFWorkbook(is);// 创建个workbook，
// 获取第一个sheet
sheet = workbook.getSheetAt(0);
} catch (Exception e1) {
e1.printStackTrace();
}
if (sheet != null) {
try {
// 写数据
FileOutputStream fos = new FileOutputStream(newFile);
XSSFRow row = sheet.getRow(3);
if (row == null) {
row = sheet.createRow(3);
}
XSSFCell cell = row.getCell(0);
if (cell == null) {
cell = row.createCell(0);
}
// 定义一个list集合假数据
List<Map<String, Object>> lst = new ArrayList();
Map<String, Object> map1 = new HashMap<String, Object>();
for (int i = 0; i < 42; i++) {
map1.put("id" + i, i);
lst.add(map1);
}
for (int m = 0; m < lst.size(); m++) {
Map<String, Object> map = lst.get(m);
row = sheet.createRow((int) m + 3);
for (int i = 0; i < 42; i++) {
String value = map.get("id" + m) + "";
if (value.equals("null")) {
value = "0";
}
cell = row.createCell(i);
cell.setCellValue(value);
}
}
workbook.write(fos);
fos.flush();
fos.close();
// 下载
InputStream fis = new BufferedInputStream(new FileInputStream(
newFile));
HttpServletResponse response = ServletActionContext
.getResponse();
byte[] buffer = new byte[fis.available()];
fis.read(buffer);
fis.close();
response.reset();
response.setContentType("text/html;charset=UTF-8");
OutputStream toClient = new BufferedOutputStream(
response.getOutputStream());
response.setContentType("application/x-msdownload");
String newName = URLEncoder.encode(
"违法案件报表" + System.currentTimeMillis() + ".xlsx",
"UTF-8");
response.addHeader("Content-Disposition",
"attachment;filename=\"" + newName + "\"");
response.addHeader("Content-Length", "" + newFile.length());
toClient.write(buffer);
toClient.flush();
} catch (Exception e) {
e.printStackTrace();
} finally {
try {
if (null != is) {
is.close();
}
} catch (Exception e) {
e.printStackTrace();
}
}
}
// 删除创建的新文件
// this.deleteFile(newFile);
}
/**
* 复制文件
*
* @param s
* 源文件
* @param t
* 复制到的新文件
*/
public void fileChannelCopy(File s, File t) {
try {
InputStream in = null;
OutputStream out = null;
try {
in = new BufferedInputStream(new FileInputStream(s), 1024);
out = new BufferedOutputStream(new FileOutputStream(t), 1024);
byte[] buffer = new byte[1024];
int len;
while ((len = in.read(buffer)) != -1) {
out.write(buffer, 0, len);
}
} finally {
if (null != in) {
in.close();
}
if (null != out) {
out.close();
}
}
} catch (Exception e) {
e.printStackTrace();
}
}
private String getSispPath() {
String classPaths = IExportService.class.getResource("/").getPath();
String[] aa = classPaths.split("/");
String sispPath = "";
for (int i = 1; i < aa.length - 2; i++) {
sispPath += aa[i] + "/";
}
return sispPath;
}
/**
* 读取excel模板，并复制到新文件中供写入和下载
*
* @return
*/
public File createNewFile() {
// 读取模板，并赋值到新文件************************************************************
// 文件模板路径
String path = (getSispPath() + "uploadfile/违法案件报表.xlsx");
File file = new File(path);
// 保存文件的路径
String realPath = (getSispPath() + "uploadfile");
// 新的文件名
String newFileName = "违法案件报表" + System.currentTimeMillis() + ".xlsx";
// 判断路径是否存在
File dir = new File(realPath);
if (!dir.exists()) {
dir.mkdirs();
}
// 写入到新的excel
File newFile = new File(realPath, newFileName);
try {
newFile.createNewFile();
// 复制模板到新文件
fileChannelCopy(file, newFile);
} catch (Exception e) {
e.printStackTrace();
}
return newFile;
}
/**
* 下载成功后删除
*
* @param files
*/
private void deleteFile(File... files) {
for (File file : files) {
if (file.exists()) {
file.delete();
}
}
}
}