首页 > 其他分享 >多线程下载图片并压缩

多线程下载图片并压缩

时间:2023-05-23 17:55:07浏览次数:36  
标签:java String 压缩 file import new 多线程 下载 out

从ftp服务器下载文件,文件里是多张图片的name和uri,格式是 name||uri,根据uri下载图片并压缩存储到本地服务器

主要流程: 1 从ftp服务器下载文件, 2 将文件格式解析后的地址存入map容器内, 3 计算每个线程需要下载的url,并循环调用threadPool.execute(mythead),子线程根据uri下载字节流到内存中.4 用ZipOutputStream流压缩,

代码:

package kun.threadSafe;

import org.quartz.JobExecutionContext;
import org.quartz.JobExecutionException;
import org.springframework.scheduling.quartz.QuartzJobBean;

import java.io.*;
import java.net.URL;
import java.util.*;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.CountDownLatch;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;


public class PictureTransferJob extends QuartzJobBean {
    protected void executeInternal(JobExecutionContext arg0) throws JobExecutionException {
//实际的FTP配置是读取配置文件获取的
//FTP地址
        String hostName = "192.168.x.xxx";
//FTP端口
        int port = xxxx;
//FTP账号
        String userName = "xxx";
//ftp密码
        String password = "xxx";
//ftp文件存储目录
        String ftpDowload = "/";
//文件本地存储路径
        String path = this.getClass().getResource("/").getPath();
//图片地址文件存储目录
        String addrPath = path.substring(1, path.indexOf("WEB-INF/classes")) + "picAddr";
//实际下载的图片存储目录
        String picPath = path.substring(1, path.indexOf("WEB-INF/classes")) + "pic";
        addrPath = addrPath.replace("%20", " ");
        picPath = picPath.replace("%20", " ");
        try {
//创建存储图片地址的文件
            creatFile(addrPath);
//创建存储实际图片的文件
            creatFile(picPath);
            String oldAddrPath = addrPath;
            String oldPicPath = picPath;
//创建FTP连接
            FtpUtil2 ftpUtil2 = new FtpUtil2(hostName, port, userName, password, ftpDowload, true);
//遍历FTP目录下的文件
            String[] files = ftpUtil2.ListAllFiles();
//本地数据库会有一个表记录下载过的文件,这里会查询数据库和ftp列出的文件名比较,如果已经下载过的文件就不会下载,避免重复下载。
//下面省略比较的过程,循环files数组,在本地创建文件
            for (int i = 0; i < files.length; i++) {
                creatFile(addrPath + File.separator + fileName);
//ftpDowload是ftp服务器存储文件的地址,addrPath是本地存储文件的地址
//这里一个返回状态判断文件是否下载成功
                boolean downloadInvestorFlag = ftpUtil2.downloadFile(ftpDowload, addrPath);
//文件下载成功后调读取文件的方法,将需要下载的图片地址存入容器
                boolean entityState = setPictureDetail(addrPath, picPath, fileNameDate);
            }
        } catch (Exception e) {
            e.printStackTrace();
//调记录错误日志的业务类用于发送下载文件出错的短信
        }
    }

    //这里开始读图片地址
    private boolean setPictureDetail(String addrPath, String picPath, String synDate) {
        System.out.println("----------进入setPictureDetail方法-----------");
        BufferedReader br = null;
        try {
            br = new BufferedReader(new InputStreamReader(new FileInputStream(addrPath), "UTF-8"));
            String row;
            int count = 0;
//map中存储每行读取到的图片名称和URL地址
            Map<String, String> addrMap = new HashMap<String, String>();
            while ((row = br.readLine()) != null) {
                try {
                    count++;
                    if (count == 1) {
                        continue;
                    }
                    String[] column = row.split("\\|\\|", -1);
                    addrMap.put(column[0].trim(), column[1].trim());
                } catch (Exception e) {
                    e.printStackTrace();
                }
            }
            System.out.println(new Date());
//这里调用压缩方法,压缩方法中会调用执行下载图片的方法
            zipPic(picPath, synDate, addrMap);
            System.out.println(new Date());
            System.out.println("----------完成--------------");
            return true;
        } catch (Exception e) {
            e.printStackTrace();
//调用记录错误日志的业务类
            return false;
        } finally {
            try {
                if (null != br)
                    br.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    }


    //这里是压缩文件的伪代码
    private boolean zipPic(String picPath, String synDate, Map addrMap) {
//传入需要压缩的文件列表和压缩文件名
        //这里由于是多线程存储图片流,所以需要使用线程安全的map,因此使用ConcurrentHashMap
        Map<String,InputStream> pictureList=new ConcurrentHashMap<String,InputStream>();
//这里定义每个线程下载的图片个数
        int count=400;
//存储需要下载的图片地址
        List<Map.Entry<String, String>> addrList=new ArrayList<Map.Entry<String, String>>(addrMap.entrySet());
//线程数,加一是因为要创建一个线程下载最后不足400个的图片
        int nThreads=(addrList.size()/count)+1;
//CountDownLatch countDownLatch = new CountDownLatch(nThreads);
        try
        {
            boolean downPic=false;
//执行多线程下载图片
            downPic=downPic(picPath,addrList,picList,pictureList,nThreads,count);
            if (downPic)
            {
                ZipUtil.zipByArray(picList,new File(picPath+synDate+".zip"));
            }
            return true;
        }
        catch (Exception e)
        {
            e.printStackTrace();
            return false;
        }

    }
    /**
     * 根据url地址下载图片 downPic(picPath,addrList(id,uri的map),picList,pictureList(ConcurrentHashMap),nThreads,count);
     * @throws InterruptedException
     */
    private boolean downPic(String picPath, List<Map.Entry<String, String>> addrList, Map<String, byte[]> picList, Map<String, InputStream> pictureList, int nThreads, int count)throws IOException, InterruptedException{
        ExecutorService threadPool= Executors.newFixedThreadPool(nThreads);
// 创建两个个计数器
        CountDownLatch begin=new CountDownLatch(0);
        CountDownLatch end=new CountDownLatch(nThreads);
// 循环创建线程
        for (int i = 0; i < nThreads; i++) {
            List<Map.Entry<String, String>>subAddrList=null;
// 计算每个线程执行的数据
            if ((i + 1) == nThreads) {
                int startIndex = (i * count);
                int endIndex = addrList.size();
                subAddrList = addrList.subList(startIndex, endIndex);
            } else {
                int startIndex = (i * count);
                int endIndex = (i + 1) * count;
                subAddrList = addrList.subList(startIndex, endIndex);
            }
// 线程类
            PicDownload mythead = new PicDownload(picPath,subAddrList,picList,pictureList);
// 这里执行线程的方式是调用线程池里的threadPool.execute(mythead)方法。
            try
            {
                threadPool.execute(mythead);
            }
            catch (Exception e)
            {
//记录错误日志
                return false;
            }
        }
        begin.countDown();
        end.await();
// 执行完关闭线程池
        threadPool.shutdown();
//这里一定要循环直到线程池中所有线程都结束才能往下走,测试时由于没有这一步导致子线程下载图片还没完成,而主线程已经往下走了,导致压缩包内没有图片
//也可以使用CountDownLatch实现
/*while (true)
{
if (threadPool.isTerminated())
{
System.out.println("所有子线程已结束!");
break;
}
}*/
        return true;
    }

    /**
     * 创建文件
     *
     * @param path
     */
    private void creatFile(String path) {
        File file = new File(path);
        if (!file.exists()) {
            file.mkdirs();
        }
    }

}
package kun.threadSafe;

import java.io.File;
import java.io.FileOutputStream;
import java.io.InputStream;
import java.net.HttpURLConnection;
import java.net.URL;
import java.util.List;
import java.util.Map;
import java.util.concurrent.CountDownLatch;

class PicDownload implements Runnable{
//下载图片的地址列表
List<Map.Entry<String, String>> addrList;
//装载下载成功的图片列表
Map<String, byte[]> picList;
Map<String, InputStream> pictureList;
//图片本地存储路径
String picPath;
CountDownLatch begin,end;
public PicDownload(String picPath, List<Map.Entry<String, String>> addrList, Map<String, byte[]> picList, CountDownLatch begin, CountDownLatch end){
this.addrList=addrList;
this.picList=picList;
this.picPath=picPath;
this.begin=begin;
this.end=end;
}
@Override
public void run()
{
try
{
System.out.println(Thread.currentThread().getName()+"------"+Thread.currentThread().getId());
downPicture(addrList);
//System.out.println(countDownLatch.getCount());
begin.await();
}
catch (Exception e)
{
e.printStackTrace();
}finally{
end.countDown();
//countDownLatch.countDown();
}
}
    /**
     *使用容器存储下载的图片字节数组
     */
    public boolean downPicture(List<Map.Entry<String, String>> addrList) throws Exception{
        InputStream is=null;
        FileOutputStream fos=null;
        URL url=null;
        String fileName=null;
        String picAddr=null;
        File pic=null;
        try
        {
            for(Map.Entry<String, String> addrEntry:addrList)
            {
                fileName=addrEntry.getKey();
                picAddr=addrEntry.getValue();
//创建Url对象
                url=new URL(picAddr);
//打开连接,创建java.net.URLConnection对象,该对象没有关闭连接的方法,可以转为它的子类HttpURLConnection调用disconnect方法关闭连接。
//java.net.URLConnection和java.net.HttpURLConnection都有设置超时时间的方法关闭连接
HttpURLConnection uc=(HttpURLConnection)url.openConnection();
                is=uc.getInputStream();
//URLConnection获取到的流通过InputStream直接写入字节数组会缺失数据,导致下载的图片不完整,使用org.apache.commons.io.IOUtils.toByteArray(urlconnection.openstream())可以解决
                byte[] bytes= IOUtils.toByteArray(is);//new byte[is.available()];获取的字节
//流中数据读入字节数组,读入后,流中数据清空
//is.read(bytes);
                picList.put(fileName+".jpg",bytes);
                is.close();
            }
            return true;
        }
        catch (Exception e)
        {
            e.printStackTrace();
            return false;
        }
        finally{
            if (null!=is)
            {
                is.close();
            }
        }
    }

}

 

package kun.threadSafe;

import org.apache.commons.net.ftp.FTPClient;
import org.apache.commons.net.ftp.FTPClientConfig;
import org.apache.commons.net.ftp.FTPConnectionClosedException;
import org.apache.commons.net.ftp.FTPReply;
import org.springframework.beans.factory.annotation.Value;

import java.io.*;

public class FtpUtil {
    private FTPClient ftpClient = null;
    // ftp服务器地址
    private String hostName;
    // ftp服务器默认端口
    public static int defaultport = 21;
    // 登录名
    private String userName;
    // 登录密码
    private String password;
// 需要访问的远程目录

    private String remoteDir;
/**
 * @param hostName
 * 主机地址
 * @param port
 * 端口号
 * @param userName
 * 用户名
 * @param password
 * 密码
 * @param remoteDir
 * 默认工作目录
 * @param is_zhTimeZone
 * 是否是中文FTP Server端
 * @return
 * @return
 */
    /**
     * 新增方法
     */
    public FtpUtil() {
        boolean is_zhTimeZone = true;
        this.hostName = hostName;
        this.userName = userName;
        this.password = password;
        this.remoteDir = remoteDir == null ? "" : remoteDir;
        this.ftpClient = new FTPClient();
        if (is_zhTimeZone) {
            this.ftpClient.configure(FtpUtil2.Config());
            this.ftpClient.setControlEncoding("GBK");
        }
// 登录
        this.login();
// 切换目录
        this.changeDir(this.remoteDir);
        this.setFileType(FTPClient.BINARY_FILE_TYPE);
        ftpClient.setDefaultPort(Integer.parseInt(port));
    }

    public FtpUtil(String hostName, int port, String userName,
                    String password, String remoteDir, boolean is_zhTimeZone) {
        this.hostName = hostName;
        this.userName = userName;
        this.password = password;
        defaultport = port;
        this.remoteDir = remoteDir == null ? "" : remoteDir;
        this.ftpClient = new FTPClient();
        if (is_zhTimeZone) {
            this.ftpClient.configure(FtpUtil2.Config());
            this.ftpClient.setControlEncoding("GBK");
        }
// 登录
        this.login();
// 切换目录
        this.changeDir(this.remoteDir);
        this.setFileType(FTPClient.ASCII_FILE_TYPE);
        ftpClient.setDefaultPort(port);
    }

    /**
     * 登录FTP服务器
     */
    public boolean login() {
        boolean success = false;
        try {
            ftpClient.connect(this.hostName, defaultport);
            ftpClient.login(this.userName, this.password);
            int reply;
            reply = ftpClient.getReplyCode();
            if (!FTPReply.isPositiveCompletion(reply)) {
                ftpClient.disconnect();
                return success;
            }
        } catch (FTPConnectionClosedException e) {
// TODO Auto-generated catch block
            e.printStackTrace();
        } catch (IOException e) {
// TODO Auto-generated catch block
            e.printStackTrace();
        }
        success = true;
        System.out.println("连接到ftp服务器:" + this.hostName + " 成功..开始登录");
        return success;
    }

    private static FTPClientConfig Config() {
        FTPClientConfig conf = new FTPClientConfig(FTPClientConfig.SYST_UNIX);
        conf.setRecentDateFormatStr("MM月dd日 HH:mm");
// conf.setRecentDateFormatStr("(YYYY年)?MM月dd日( HH:mm)?");
        return conf;
    }

    /**
     * 变更工作目录
     *
     * @param remoteDir
     */
    public void changeDir(String remoteDir) {
        try {
            this.remoteDir = remoteDir;
            ftpClient.changeWorkingDirectory(remoteDir);
        } catch (IOException e) {
// TODO Auto-generated catch block
            e.printStackTrace();
        }
        System.out.println("变更工作目录为:" + remoteDir);
    }

    /**
     * 返回上一级目录(父目录)
     */
    public void toParentDir() {
        try {
            ftpClient.changeToParentDirectory();
        } catch (IOException e) {
// TODO Auto-generated catch block
            e.printStackTrace();
        }
    }

    /**
     * 列出当前工作目录下所有文件
     */
    public String[] ListAllFiles() {
        String[] names = this.ListFiles("*");
        return this.sort(names);
    }

    /**
     * 列出指定工作目录下的匹配文件
     *
     * @param dir        exp: /cim/
     * @param file_regEx 通配符为*
     */
    public String[] ListAllFiles(String dir, String file_regEx) {
        String[] names = this.ListFiles(dir + file_regEx);
        return this.sort(names);
    }

    /**
     * 列出匹配文件
     *
     * @param file_regEx 匹配字符,通配符为*
     */
    public String[] ListFiles(String file_regEx) {
        try {
/**
 * FTPFile[] remoteFiles = ftpClient.listFiles(file_regEx);
 * //System.out.println(remoteFiles.length); String[] name = new
 * String[remoteFiles.length]; if(remoteFiles != null) { for(int
 * i=0;i<remoteFiles.length;i++) { if(remoteFiles[i] == null)
 * name[i] = ""; else
 * if(remoteFiles[i].getName()==null||remoteFiles
 * [i].getName().equals
 * (".")||remoteFiles[i].getName().equals("..")) { name[i] = "";
 * } else name[i] = remoteFiles[i].getName();
 * System.out.println(name[i]); } }
 */
            ftpClient.enterLocalPassiveMode();
            String[] name = ftpClient.listNames(file_regEx);
            ;
            if (name == null)
                return new String[0];
            return this.sort(name);
        } catch (Exception e) {
// TODO Auto-generated catch block
            e.printStackTrace();
        }
        return new String[0];
    }

    public void Lists(String reg) {
        try {
            String[] a = ftpClient.listNames(reg);
            if (a != null) {
                for (String b : a) {
                    System.out.println(b);
                }
            }
        } catch (IOException e) {
// TODO Auto-generated catch block
            e.printStackTrace();
        }
    }

    /**
     * 设置传输文件的类型[文本文件或者二进制文件]
     *
     * @param fileType --BINARY_FILE_TYPE,ASCII_FILE_TYPE
     */
    public void setFileType(int fileType) {
        try {
            ftpClient.setFileType(fileType);
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    /**
     * 上传文件
     *
     * @param localFilePath --本地文件路径+文件名
     * @param newFileName   --新的文件名
     */
    public void uploadFile(String localFilePath, String newFileName) {
// 上传文件
        this.ftpClient.enterLocalPassiveMode();// 被动模式连接
        BufferedInputStream buffIn = null;
        try {
            buffIn = new BufferedInputStream(new FileInputStream(localFilePath));
            boolean ifUpload = ftpClient.storeFile(newFileName, buffIn);
            if (!ifUpload) {
                System.out.println("上传文件失败。。。");
            } else {
                System.out.println("上传文件成功。。。");
            }
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            try {
                if (buffIn != null)
                    buffIn.close();
            } catch (Exception e) {
                e.printStackTrace();
            }
        }
    }

    /**
     * 上传文件2
     *
     * @param file        --FileInputStream的文件
     * @param newFileName --新的文件名
     */
    public void newUploadFile(FileInputStream file, String newFileName) {
// 上传文件
        this.ftpClient.enterLocalPassiveMode();// 被动模式连接
        BufferedInputStream buffIn = null;
        try {
            buffIn = new BufferedInputStream(file);
            boolean ifUpload = ftpClient.storeFile(newFileName, buffIn);
            if (!ifUpload) {
                System.out.println("上传文件失败。。。");
            } else {
                System.out.println("上传文件成功。。。");
            }
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            try {
                if (buffIn != null)
                    buffIn.close();
            } catch (Exception e) {
                e.printStackTrace();
            }
        }
    }

    /**
     * 下载文件(单个)
     *
     * @param remoteFileName --服务器上的文件名
     * @param localFileName  --本地文件名
     */
    public boolean downloadFile(String remoteFileName, String localFileName) {
        this.ftpClient.enterLocalPassiveMode();// 被动模式连接
        BufferedOutputStream buffOut = null;
        try {
            buffOut = new BufferedOutputStream(new FileOutputStream(
                    localFileName));
            boolean ifDownload = ftpClient
                    .retrieveFile(remoteFileName, buffOut);
            if (!ifDownload) {
                System.out.println("下载文件失败。。。");
                return false;
            } else {
                System.out.println("下载文件成功。。。");
            }
        } catch (Exception e) {
            e.printStackTrace();
            return false;
        } finally {
            try {
                if (buffOut != null)
                    buffOut.close();
            } catch (Exception e) {
                e.printStackTrace();
            }
        }
        return true;
    }

    /**
     * 关闭FTP连接
     */
    public void close() {
        try {
            if (ftpClient != null) {
                ftpClient.logout();
                ftpClient.disconnect();
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    /**
     * 冒泡排序字符串(从大到小)
     */
    public String[] sort(String[] str_Array) {
        if (str_Array == null) {
            throw new NullPointerException("The str_Array can not be null!");
        }
        String tmp = "";
        for (int i = 0; i < str_Array.length; i++) {
            for (int j = 0; j < str_Array.length - i - 1; j++) {
                if (str_Array[j].compareTo(str_Array[j + 1]) < 0) {
                    tmp = str_Array[j];
                    str_Array[j] = str_Array[j + 1];
                    str_Array[j + 1] = tmp;
                }
            }
        }
        return str_Array;
    }

    public static void main(String[] strs) {
        FtpUtil2 FtpUtil2 = new FtpUtil2("192.168.1.112", 20011, "test1",
                "test1", "/", true);
        FtpUtil2.downloadFile("test.txt", "d:\\test.txt");
    }
}
package kun.threadSafe;

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 java.util.Enumeration;
import java.util.List;
import java.util.Map;
import java.util.zip.ZipEntry;
import java.util.zip.ZipFile;
import java.util.zip.ZipOutputStream;
import org.apache.commons.io.IOUtils;

public class ZipUtil {

/**
* 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 OutputStream zipFiles(List<File> srcfile, OutputStream outputStream) {
byte[] buf = new byte[1024];
try {
// Create the ZIP file
ZipOutputStream out = new ZipOutputStream(outputStream);
// 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) {
//System.out.println(len+"==============");
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);
}
return outputStream;
}
/**
* 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);
}
}
/**
* 压缩文件
* srcfile:key:文件名,value:文件对应的输入流
* @param srcfile
* @param zipfile
* @see
*/
public static void zipByStream(Map<String,InputStream> srcfile, File zipfile) {
try {
// Create the ZIP file
ZipOutputStream out = new ZipOutputStream(new FileOutputStream(zipfile));
// Compress the files
System.out.println(srcfile.entrySet().size());
for (Map.Entry<String, InputStream> fileEntry:srcfile.entrySet()) {
InputStream in = fileEntry.getValue();
// Add ZIP entry to output stream.
System.out.println(in.available());
out.putNextEntry(new ZipEntry(fileEntry.getKey()));
// Transfer bytes from the file to the ZIP file
byte[] bytes=IOUtils.toByteArray(in);
out.write(bytes);
out.closeEntry();
in.close();
}
// Complete the ZIP file
out.close();
} catch (IOException e) {
log.error("ZipUtil zipFiles exception:"+e);
System.out.println(e.getMessage());
}
}
/**
* 压缩文件
* srcfile:key:文件名,value:文件对应的字节数组
* @param srcfile
* @param zipfile
* @see
*/
public static void zipByArray(Map<String,byte[]> srcfile, File zipfile) {
byte[] buf = new byte[1024];
try {
// Create the ZIP file
ZipOutputStream out = new ZipOutputStream(new FileOutputStream(zipfile));
// Compress the files
System.out.println(srcfile.entrySet().size());
for (Map.Entry<String, byte[]> fileEntry:srcfile.entrySet()) {
//InputStream in = fileEntry.getValue();
// Add ZIP entry to output stream.
out.putNextEntry(new ZipEntry(fileEntry.getKey()));
// Transfer bytes from the file to the ZIP file
byte[] bytes=fileEntry.getValue();//IOUtils.toByteArray(in);
out.write(bytes);
out.closeEntry();
//in.close();
}
// Complete the ZIP file
out.close();
} catch (IOException e) {
log.error("ZipUtil zipFiles exception:"+e);
System.out.println(e.getMessage());
}
}
/**
* 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("d:\\1.jpg"));
srcfile.add(new File("d:\\2.jpg"));
srcfile.add(new File("d:\\3.jpg"));
srcfile.add(new File("d:\\4.jpg"));
File zipfile = new File("d:\\pic.zip");
ZipUtil.zipFiles(srcfile, zipfile);
}
}

 

 

标签:java,String,压缩,file,import,new,多线程,下载,out
From: https://www.cnblogs.com/1--2/p/17425982.html

相关文章

  • jdk11 及jdk8阿里云快速下载链接
    1jdk11及jdk8阿里云快速下载链接####1-jdk11linux版本jdk-11.0.7_linux-x64_bin.tar.gzhttps://code.aliyun.com/kar/oracle-jdk/raw/3c932f02aa11e79dc39e4a68f5b0483ec1d32abe/jdk-11.0.7_linux-x64_bin.tar.gz####2-jdk11macjdk-11.0.7_osx-x64_bin.tar.gzhttps://......
  • Git的下载安装配置
     git教程 1.版本管理工具概念我在大学毕业写论文的时候的时候碰到过如下的现象```<<毕业论文第一版.doc>><<毕业论文第二版.doc>><<毕业论文第三版.doc>><<毕业论文最终版.doc>><<毕业论文最终版2.doc>>```在这种情况下如果不能查看修改之前的代码,查找问题是非常困难的......
  • 将dom转化为图片和批量下载
    利用html2canvas和jszip第三方库importhtml2canvasfrom'html2canvas'importjszipfrom'jszip'具体实现:downloadAll(){this.loading=truelet_this=thisconststations=document.getElementsByClassName('station_b......
  • 多线程要点博客锦集
    写的好的博客要收藏起来,避免以后丢失!1、Java多线程:彻底搞懂线程池2、Java线程池实现原理及其在美团业务中的实践......
  • Python多线程爬虫又来了
    Python多线程的主要好处是可以在单个程序中同时执行多个任务,从而提高应用程序的性能和效率。具体来说,多线程有以下几个优点:提高CPU利用率:通过多线程,可以更充分地利用CPU资源,尤其适用于计算密集型的任务。降低IO阻塞:对于需要等待IO操作完成的任务(如网络请求或文件读写),将它们放入......
  • zip压缩保留软链接命令
    压缩保留软链接命令-j:将要压缩的内容前面的路径不保留,即下面示例libxxx.so*前面的路径解压缩后不存在,没有该参数则存在-r:递归压缩-y:保留软链接关系zip-jrylibxxx.zip/home/plat/linux_5_10_latest/libxxx.so*上面命令不使用-j参数测试如下:zip-rylibxxx.zip/home/......
  • 苹果Mac电脑桌面下面Dock栏的下载不见了怎么办
    MACDock栏中的下载选项不见了,一般是以下两种: 1、首先请打开Finder窗口,可以在左窗格中看到“下载”栏目,我们可以直接把它拖动到Dock上。 2、我们可以看到“下载”栏目已经恢复到了Dock栏上,虽然是恢复了,但当我们点击预览时,结果发现它的显示方式和排......
  • The Foundry Nuke 14Mac软件安装包下载Nuke14Mac安装教程
    安装步骤:1,双击下载好的安装包,打开镜像2,然后选将nuke14直接拉到applications里面。3,返回镜像,选择FLT7.1v1-mac-x86...双击打开。4,点击允许。5,点击好。6,点击继续。7,继续。8,继续。9,点击同意。10,点击安装。11,输入电脑密码。12,安装结束点击关闭。13,打开foundrylicenseutility。14,123,按照......
  • VMware ESXi 6.0 U3 Final - ESXi 6 系列最终版下载
    VMwareESXi6.0U3Final-ESXi6系列最终版下载VMwareESXi6Standard请访问原文链接:https://sysin.org/blog/vmware-esxi-6/,查看最新版。原创作品,转载请保留出处。作者主页:sysin.orgVersionReleaseNameReleaseDateBuildNumberInstallerBuildNumberAvailab......
  • VMware ESXi 6.5 U3 Final - ESXi 6 系列最终版下载
    VMwareESXi6.5U3Final-ESXi6系列最终版下载VMwareESXi6Standard请访问原文链接:https://sysin.org/blog/vmware-esxi-6/,查看最新版。原创作品,转载请保留出处。作者主页:sysin.orgVersionReleaseNameReleaseDateBuildNumberInstallerBuildNumberAvailab......