文件压缩下载
package com.ruoyi.utils;
import com.ruoyi.common.utils.DateUtils;
import com.ruoyi.common.utils.StringUtils;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.*;
import java.util.ArrayList;
import java.util.Date;
import java.util.List;
import java.util.UUID;
import java.util.zip.ZipEntry;
import java.util.zip.ZipOutputStream;
/**
* @Auther: ZHANG PU
* @Date: 2022/6/7 18:01
* @Description:
*/
public class ZipUtils {
private static final int BUFFER_SIZE = 2 * 1024;
/**
* 压缩成ZIP 方法1
*
* @param srcDir 压缩文件夹路径
* @param out 压缩文件输出流
* @param KeepDirStructure 是否保留原来的目录结构,true:保留目录结构;
* false:所有文件跑到压缩包根目录下(注意：不保留目录结构可能会出现同名文件,会压缩失败)
* @throws RuntimeException 压缩失败会抛出运行时异常
*/
public static void toZip(String srcDir, OutputStream out, boolean KeepDirStructure) throws RuntimeException {
long start = System.currentTimeMillis();
ZipOutputStream zos = null;
try {
zos = new ZipOutputStream(out);
File sourceFile = new File(srcDir);
compress(sourceFile, zos, sourceFile.getName(), KeepDirStructure);
long end = System.currentTimeMillis();
System.out.println("压缩完成，耗时：" + (end - start) + " ms");
} catch (Exception e) {
throw new RuntimeException("zip error from ZipUtils", e);
} finally {
if (zos != null) {
try {
zos.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
}
/**
* 压缩成ZIP 方法2
*
* @param srcFiles 需要压缩的文件列表
* @param out 压缩文件输出流
* @throws RuntimeException 压缩失败会抛出运行时异常
*/
public static void toZip(List srcFiles, OutputStream out) throws RuntimeException {
long start = System.currentTimeMillis();
ZipOutputStream zos = null;
try {
zos = new ZipOutputStream(out);
for (File srcFile : srcFiles) {
byte[] buf = new byte[BUFFER_SIZE];
zos.putNextEntry(new ZipEntry(srcFile.getName()));
int len;
FileInputStream in = new FileInputStream(srcFile);
while ((len = in.read(buf)) != -1)
{
zos.write(buf, 0, len);
}
zos.closeEntry();
in.close();
}
long end = System.currentTimeMillis();
} catch (Exception e) {
throw new RuntimeException("zip error from ZipUtils", e);
} finally {
if (zos != null) {
try {
zos.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
}
/**
* 递归压缩方法
*
* @param sourceFile 源文件
* @param zos zip输出流
* @param name 压缩后的名称
* @param KeepDirStructure 是否保留原来的目录结构,true:保留目录结构;
* false:所有文件跑到压缩包根目录下(注意：不保留目录结构可能会出现同名文件,会压缩失败)
* @throws Exception
*/
private static void compress(File sourceFile, ZipOutputStream zos, String name, boolean KeepDirStructure) throws Exception {
byte[] buf = new byte[BUFFER_SIZE];
if (sourceFile.isFile()) {
// 向zip输出流中添加一个zip实体，构造器中name为zip实体的文件的名字
zos.putNextEntry(new ZipEntry(name));
// copy文件到zip输出流中
int len;
FileInputStream in = new FileInputStream(sourceFile);
while ((len = in.read(buf)) != -1)
{
zos.write(buf, 0, len);
}
zos.closeEntry();
in.close();
} else {
File[] listFiles = sourceFile.listFiles();
if (listFiles == null || listFiles.length == 0)
{
// 需要保留原来的文件结构时,需要对空文件夹进行处理
if (KeepDirStructure)
{
// 空文件夹的处理
zos.putNextEntry(new ZipEntry(name + "/"));
// 没有文件，不需要文件的copy
zos.closeEntry();
}
} else {
for (File file : listFiles)
{
// 判断是否需要保留原来的文件结构
if (KeepDirStructure)
{
// 注意：file.getName()前面需要带上父文件夹的名字加一斜杠,
// 不然最后压缩包中就不能保留原来的文件结构,即：所有文件都跑到压缩包根目录下了
compress(file, zos, name + "/" + file.getName(), KeepDirStructure);
} else {
compress(file, zos, file.getName(), KeepDirStructure);
}
}
}
}
}
public static void main(String[] args) throws Exception {
FileOutputStream fos1 = new FileOutputStream(new File("c:/mytest01.zip"));
ZipUtils.toZip("D:/log", fos1, true);
List fileList = new ArrayList<>();
fileList.add(new File("D:/Java/jdk1.7.0_45_64bit/bin/jar.exe"));
fileList.add(new File("D:/Java/jdk1.7.0_45_64bit/bin/java.exe"));
FileOutputStream fos2 = new FileOutputStream(new File("c:/mytest02.zip"));
ZipUtils.toZip(fileList, fos2);
}
/**
* 压缩图片下载
* @param request
* @param response
* @param fileUrl
* @throws Exception
*/
public static void downImageZip(HttpServletRequest request, HttpServletResponse response,List fileUrl) throws Exception{
//创建临时文件夹
String rootPath = request.getSession().getServletContext().getRealPath("/");
File temDir = new File(rootPath + "/" + UUID.randomUUID().toString().replaceAll("-", ""));
if(!temDir.exists())
{
temDir.mkdirs();
}
//生成需要下载的文件，存放在临时文件夹内
for (String url : fileUrl)
{
if(StringUtils.isNotBlank(url))
{
String fileName = url.substring(url.lastIndexOf("/") + 1, url.length());
byte[] btImg = UrlConverStreamUtils.getImageFromNetByUrl(url);
FileOutputStream fops = new FileOutputStream(temDir.getPath()+"/"+fileName);
fops.write(btImg);
fops.flush();
fops.close();
}
}
//设置response的header
response.setContentType("application/zip");
response.setHeader("Content-Disposition", "attachment; filename="+ DateUtils.dateTime(new Date()) +".zip");
// 下载zip压缩包,不需要保留目录结构
ZipUtils.toZip(temDir.getPath(), response.getOutputStream(),false);
//删除临时文件和文件夹
File[] listFiles = temDir.listFiles();
for (int i = 0; i < listFiles.length; i++)
{
listFiles[i].delete();
}
temDir.delete();
}
}
