java中生成30萬的excel（採用多個excel，每一個上面放6萬數據，最後打包zip保存）

時間 2019-11-10

標籤 java 生成 excel 採用多個每一個上面數據最後打包 zip 保存欄目 Java 简体版

原文原文鏈接

沒事作就想到作這個東西java

首先要說明的是excel03 每一個sheet最多放65535行因此，每行不能超過這個數，若是想放的多，能夠考慮生成excel2007，數據庫

好像excel2007能夠放100W多行數據apache

大數據量生成excel我只想到三種方法，固然基本也是網上看到的數組

1 生成多個excel打包 2 利用xml方式生成 3 用最新的包 app

如今講的是第一種第二種也能夠之後會作下測試第三種好像不行，一直內存溢出dom

直接上代碼jsp

這個是servlet：工具

package servlets;測試

import java.io.File; 大數據

import java.io.FileInputStream;

import java.io.FileOutputStream;

import java.io.IOException;

import java.io.OutputStream;

import java.text.SimpleDateFormat;

import java.util.ArrayList;

import java.util.Date;

import java.util.List;

import javax.servlet.ServletException;

import javax.servlet.http.HttpServlet;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

import org.apache.poi.hssf.usermodel.HSSFWorkbook;

import org.apache.poi.hssf.util.CellRangeAddress;

import org.apache.poi.ss.usermodel.Cell;

import org.apache.poi.ss.usermodel.CellStyle;

import org.apache.poi.ss.usermodel.Row;

import org.apache.poi.ss.usermodel.Sheet;

import org.apache.poi.ss.usermodel.Workbook;

import util.DBConnectionManager;
import domain.Person;

public class exportExcel extends HttpServlet {

private String fileName;

public void destroy() {

super.destroy(); // Just puts "destroy" string in log

// Put your code here

}

public void doGet(HttpServletRequest request, HttpServletResponse response)

throws ServletException, IOException {

// 文件名獲取

Date date = new Date();

SimpleDateFormat format = new SimpleDateFormat("yyyyMMddHHmmss");

String f = "Person-" + format.format(date);

this.fileName = f;

setResponseHeader(response);

OutputStream out = null;

try {

   System.out.println("導出excel開始~~~"+System.currentTimeMillis());
   long startTime = System.currentTimeMillis();
   out = response.getOutputStream();
   DBConnectionManager db = new DBConnectionManager();//該部分是用於連接數據庫
   List<Person> list = db.queryDataList(" select * from TEST_EXPORT ");//查詢數據集合

   toExcel(list, request, 50000, f, out);
   System.out.println("導出excel結束~~~"+System.currentTimeMillis());
   long endTime = System.currentTimeMillis();

   System.out.println("導出excel共花費時間~~~"+(endTime-startTime)/1000);

  } catch (IOException e1) {

e1.printStackTrace();

} finally {

try {

out.flush();

out.close();

} catch (IOException e) {

e.printStackTrace();

}

/** 設置響應頭 */

public void setResponseHeader(HttpServletResponse response) {

try {

response.setContentType("application/octet-stream;charset=UTF-8");

response.setHeader("Content-Disposition", "attachment;filename="

+ java.net.URLEncoder.encode(this.fileName, "UTF-8")

+ ".zip");

response.addHeader("Pargam", "no-cache");

response.addHeader("Cache-Control", "no-cache");

} catch (Exception ex) {

ex.printStackTrace();

}

public void doPost(HttpServletRequest request, HttpServletResponse response)

throws ServletException, IOException {

doGet(request, response);

}

public void init() throws ServletException {

// Put your code here

}

@SuppressWarnings("deprecation")
public void toExcel(List<Person> list, HttpServletRequest request,

int length, String f, OutputStream out) throws IOException {

List<String> fileNames = new ArrayList();// 用於存放生成的文件名稱s

File zip = new File(request.getRealPath("/excel") + f + ".zip");// 壓縮文件

// 生成excel

for (int j = 0, n = list.size() / length + 1; j < n; j++) {

Workbook book = new HSSFWorkbook();

Sheet sheet = book.createSheet("person");

double d = 0;// 用來統計

String file = request.getRealPath("/excel") + "/" + f + "-" + j

+ ".xls";

fileNames.add(file);

FileOutputStream o = null;

try {

o = new FileOutputStream(file);

// sheet.addMergedRegion(new

// CellRangeAddress(list.size()+1,0,list.size()+5,6));

Row row = sheet.createRow(0);

row.createCell(0).setCellValue("ID");

row.createCell(1).setCellValue("NAME");

row.createCell(2).setCellValue("REMARK");

int m = 1;

for (int i = 1, min = (list.size() - j * length + 1) > (length + 1) ? (length + 1)

: (list.size() - j * length + 1); i < min; i++) {

m++;

Person user = list.get(length * (j) + i - 1);

row = sheet.createRow(i);

row.createCell(0).setCellValue(user.getId());

row.createCell(1).setCellValue(user.getName());

row.createCell(2).setCellValue(user.getRemark());

}

//    CellStyle cellStyle2 = book.createCellStyle();
//
//    cellStyle2.setAlignment(CellStyle.ALIGN_CENTER);
//
//    row = sheet.createRow(m);
//
//    Cell cell0 = row.createCell(0);
//
//    cell0.setCellValue("Total");
//
//    cell0.setCellStyle(cellStyle2);
//
//    Cell cell4 = row.createCell(4);
//
//    cell4.setCellValue(d);
//
//    cell4.setCellStyle(cellStyle2);
//
//    sheet.addMergedRegion(new CellRangeAddress(m, m, 0, 3));

} catch (Exception e) {

e.printStackTrace();

}

try {

book.write(o);

} catch (Exception ex) {

ex.printStackTrace();

} finally {

    if (o != null){

     o.flush();

     o.close();
    }

}

File srcfile[] = new File[fileNames.size()];

for (int i = 0, n = fileNames.size(); i < n; i++) {

srcfile[i] = new File(fileNames.get(i));

}

util.FileZip.ZipFiles(srcfile, zip);

FileInputStream inStream = new FileInputStream(zip);

byte[] buf = new byte[4096];

int readLength;

while (((readLength = inStream.read(buf)) != -1)) {

out.write(buf, 0, readLength);

}
inStream.close();

}

實體類

package domain;

public class Person {

private String id;
private String name;
private String remark;
public String getId() {
  return id;
}
public void setId(String id) {
  this.id = id;
}
public String getName() {
  return name;
}
public void setName(String name) {
  this.name = name;
}
public String getRemark() {
  return remark;
}
public void setRemark(String remark) {
  this.remark = remark;
}

}