java导出多个excel并打成zip包

瑶疏影 2016-08-04

展开全文

这里主要是要针对数据量过大,通过生成多个excel文件并打成一个zip压缩包提供下载.

压缩excel的类 ZipUtil：

Java代码

import java.io.*;
import java.util.*;
import java.util.zip.ZipOutputStream;
import java.util.zip.ZipEntry;
import java.util.zip.ZipFile;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
public class ZipUtil {
private static final Log log = LogFactory.getLog(ZipUtil.class);
/**
* 压缩文件
*
* @param srcfile File[] 需要压缩的文件列表
* @param zipfile File 压缩后的文件
*/
public static void zipFiles(List<File> srcfile, File zipfile) {
byte[] buf = new byte[1024];
try {
// Create the ZIP file
ZipOutputStream out = new ZipOutputStream(new FileOutputStream(zipfile));
// Compress the files
for (int i = 0; i < srcfile.size(); i++) {
File file = srcfile.get(i);
FileInputStream in = new FileInputStream(file);
// Add ZIP entry to output stream.
out.putNextEntry(new ZipEntry(file.getName()));
// Transfer bytes from the file to the ZIP file
int len;
while ((len = in.read(buf)) > 0) {
out.write(buf, 0, len);
}
// Complete the entry
out.closeEntry();
in.close();
}
// Complete the ZIP file
out.close();
} catch (IOException e) {
log.error("ZipUtil zipFiles exception:"+e);
}
}
/**
* 解压缩
*
* @param zipfile File 需要解压缩的文件
* @param descDir String 解压后的目标目录
*/
public static void unZipFiles(File zipfile, String descDir) {
try {
// Open the ZIP file
ZipFile zf = new ZipFile(zipfile);
for (Enumeration entries = zf.entries(); entries.hasMoreElements();) {
// Get the entry name
ZipEntry entry = ((ZipEntry) entries.nextElement());
String zipEntryName = entry.getName();
InputStream in = zf.getInputStream(entry);
// System.out.println(zipEntryName);
OutputStream out = new FileOutputStream(descDir + zipEntryName);
byte[] buf1 = new byte[1024];
int len;
while ((len = in.read(buf1)) > 0) {
out.write(buf1, 0, len);
}
// Close the file and stream
in.close();
out.close();
}
} catch (IOException e) {
log.error("ZipUtil unZipFiles exception:"+e);
}
}
/**
* Main
*
* @param args
*/
public static void main(String[] args) {
List<File> srcfile=new ArrayList<File>();
srcfile.add(new File("e:\\1.xls"));
srcfile.add(new File("e:\\2.xls"));
srcfile.add(new File("e:\\3.xls"));
srcfile.add(new File("e:\\4.xls"));
srcfile.add(new File("e:\\5.xls"));
File zipfile = new File("e:\\edm.zip");
ZipUtil.zipFiles(srcfile, zipfile);
}
}

生成多个excel 类：

Java代码

/**
* forward:导出Excel
* @throws Exception
*/
private ModelAndView forwardExport2Excel(HttpServletRequest request, HttpServletResponse response)
throws Exception{
try {
Integer page=0;//页数
Integer pagesize=Integer.valueOf(PropertiesUtil.getPropertyValue("PAGESIZE"));//每页显示数
Integer total=0;//总数
int pageindex=1;//当前页数
Integer rowfrom = 1;
Integer rowto = 10;
total =service.getTotal();
if(total<pagesize){
page=1;
System.out.println("from:"+rowfrom+"---"+total);
List<Object> list = new ArrayList<Object>();
list = service.getAllList(rowfrom,total);
JXLUtil.writeEmailInfo2Excel(response, "邮箱信息总览", "titles", list,pageindex);
}else{
Integer mode=total%pagesize;
if(mode!=0){
page=total/pagesize+1;
}else{
page=total/pagesize;
}
if(total!=0 && page!=0){
while(pageindex<=page ){
if(total<0){
break;
}
if( total>pageindex*pagesize ){
System.out.println("from:"+(rowfrom)+"----"+pageindex*pagesize);
List<Object> list = new ArrayList<Object>();
list = service.getAllList(rowfrom,pagesize);
JXLUtil.writeEmailInfo2Excel(response, "邮箱信息总览", "titles", list,pageindex);
rowfrom=pageindex*pagesize;
pageindex++;
}else{
System.out.println("from:"+rowfrom+"--"+total);
List<Object> list = new ArrayList<Object>();
list = service.getAllList(rowfrom,total);
JXLUtil.writeEmailInfo2Excel(response, "邮箱信息总览", "titles", list,pageindex);
break;
}
}
}
}
List<File> srcfile=new ArrayList<File>();
for(int p=1;p<=page;p++){
srcfile.add(new File(PropertiesUtil.getPropertyValue("URL")+"zipname"+p+".xls"));
}
File zipfile = new File(PropertiesUtil.getPropertyValue("OUTPATH")+"zipname.zip");
ZipUtil.zipFiles(srcfile, zipfile);
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
writeObject("成功导出excel 地址：<html><a href="+basePath+"zipname.zip>点击下载</a></html>", response);
} catch (Exception e) {
log.error("error:"+e);
}
return null;
}