Mongodb配置文件参考这一篇:http://www.cnblogs.com/byteworld/p/5913061.html
package util;
import java.io.BufferedInputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.ArrayList;
import org.apache.commons.compress.archivers.zip.Zip64Mode;
import org.apache.commons.compress.archivers.zip.ZipArchiveEntry;
import org.apache.commons.compress.archivers.zip.ZipArchiveOutputStream;
import org.apache.poi.hssf.usermodel.HSSFWorkbook;
import org.apache.poi.ss.usermodel.Cell;
import org.apache.poi.ss.usermodel.Row;
import org.apache.poi.ss.usermodel.Sheet;
import org.apache.poi.ss.usermodel.Workbook;
import com.mongodb.DBCollection;
import com.mongodb.DBCursor;
import com.mongodb.DBObject;
import com.sun.corba.se.spi.orbutil.fsm.Input; public class CreateExcel {
/**
* 把文件压缩到zip中
* @Description:
* @param
* @return void 返回类型
*/
public static void createZip(String dir,OutputStream out){
// 用户目录下的文件
File[] f = new File("E:/"+dir).listFiles();
// 创建zip文件
ZipArchiveOutputStream zipOut = null;
InputStream input = null;
try {
zipOut = new ZipArchiveOutputStream(out);
zipOut.setEncoding("UTF-8");
zipOut.setUseZip64(Zip64Mode.AsNeeded);
// 遍历目录下的文件
for(File file:f){
if (file != null) {
ZipArchiveEntry zipEntry = new ZipArchiveEntry(file, file.getName());
zipOut.putArchiveEntry(zipEntry);
// 读取文件
input = new BufferedInputStream(new FileInputStream(file));
byte[] buff = new byte[1024];
int len = 0;
while((len = input.read(buff)) != -1){
zipOut.write(buff, 0, len);
}
zipOut.closeArchiveEntry();
}
}
} catch (IOException e) {
e.printStackTrace();
}finally{
if (input != null) {
try {
input.close();
} catch (IOException e) {
e.printStackTrace();
}
}
if (zipOut != null) {
try {
zipOut.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
} /**
* 创建Excel文件到本地
* @Description:
* @param
* @return void 返回类型
*/
public static void createExcel(String userid,String file,DBCursor cursor){
// 根据用户名创建文件夹
File dir = new File("E:/" + userid);
if (!dir.isDirectory()) {
dir.mkdirs();
}
Workbook book = new HSSFWorkbook();
// 获取标题
DBObject ob = cursor.toArray().get(0);
ArrayList<String> title = new ArrayList<>();
for(String key:ob.keySet()){
if (key.equals("_id")) {
continue;
}
title.add(key);
}
// 创建sheet
Sheet sheet = book.createSheet();
OutputStream out = null;
try {
// 写入标题栏
Row row = null;
// 标题栏的行数
Cell cell = null;
for(int i = 0;i< (cursor.count() + 1);i++){
// 标题栏
if (i == 0) {
row = sheet.createRow(i);
for (int j = 0; j < title.size(); j++) {
cell = row.createCell(j);
// 设置标题栏
cell.setCellValue(title.get(j));
}
continue;
}
// 写入数据
row = sheet.createRow(i);
out = new FileOutputStream(dir+"/"+file);
DBObject obj = null;
for (int j = 0; j < title.size(); j++) {
cell = row.createCell(j);
obj = cursor.toArray().get(j);
for(String key :obj.keySet()){
if (key.equals("_id")) {
continue;
}
if (key.equals(title.get(j))) {
cell.setCellValue((String)(obj.get(key)));
}
}
}
}
// 写入到excel
book.write(out);
} catch (IOException e1) {
e1.printStackTrace();
} finally {
try {
out.flush();
out.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
}
JSP：
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Insert title here</title>
</head>
<body>
<form method="post">
<a href="/Demo/SimpleDown"><h2>下载</h2></a>
</form>
</body>
</html>
Servlet：
package servlet;
import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.zip.ZipOutputStream;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.apache.commons.compress.archivers.zip.Zip64Mode;
import org.apache.commons.compress.archivers.zip.ZipArchiveEntry;
import org.apache.commons.compress.archivers.zip.ZipArchiveOutputStream;
import com.mongodb.DBCollection; import util.CreateExcel;
import util.DBConn; /**
* 单独文件的zip下载
*/
@WebServlet("/SimpleDown")
public class SimpleDown extends HttpServlet {
private static final long serialVersionUID = 1L; /**
* @see HttpServlet#HttpServlet()
*/
public SimpleDown() {
super();
// TODO Auto-generated constructor stub
} /**
* @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
*/
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// TODO Auto-generated method stub
doPost(request, response);
} /**
* @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
*/
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// TODO Auto-generated method stub
//DBCollection conn = DBConn.getConn();
DBCollection conn = DBConn.getConn();
CreateExcel.createExcel("User2323","weixin_data.xls", conn.find());
//createZip("User2323");
// CreateExcel.delZip("User2323");
response.setCharacterEncoding("UTF-8");
response.setHeader("Content-Disposition", "attachment;filename="+"User2323.zip");
CreateExcel.createZip("User2323", response.getOutputStream()); } }