这篇文章主要介绍了Java 压缩图片并打包成ZIP文件的示例，帮助大家更好的理解和使用Java，感兴趣的朋友可以了解下
JAVA 获取网络图片或本地图片压缩后打成ZIP，但是获取网络流存在问题：每次获取图片流的大小不一样（图片不完整），以致无法构建图片进行压缩？
/* 释以下代码：即可获取完整图片流网络不稳定情况且网络流是顺序读取，所以获得前部份流，不需要关闭连接，只需要将用完的流关闭即可 */ finally{ if(httpCon != null) httpCon.disconnect(); }
package com.sunshine.monitor.comm.util.http; import java.io.File; import java.io.FileOutputStream; import java.io.IOException; import java.io.InputStream; import java.io.OutputStream; import java.net.HttpURLConnection; import java.net.URL; import java.net.URLConnection; import java.util.Iterator; import javax.imageio.ImageIO; import javax.imageio.ImageReader; import javax.imageio.stream.ImageInputStream; import sun.net.www.protocol.ftp.FtpURLConnection; /** * 获取网络图片 * * @author OY */ public abstract class HttpHelpers { private static final String KEY = "file.encoding"; private static final String ENCODING = "GBK"; public static InputStream getInputStream(String url) throws Exception{ URLConnection con = null; HttpURLConnection httpCon = null; FtpURLConnection ftpCon= null; try { System.setProperty(KEY, ENCODING); URL _url = new URL(url); con = _url.openConnection(); con.setConnectTimeout(3000); con.setUseCaches(false);// 不缓存 con.setDefaultUseCaches(false); if (con instanceof HttpURLConnection) { httpCon = (HttpURLConnection) con; httpCon.setInstanceFollowRedirects(true); //httpCon.setRequestProperty("Accept-Charset", "utf-8"); if (httpCon.getResponseCode() >= 300) { System.out.println("URL:" + url + ",HTTP Request is not success, Response code is " + httpCon.getResponseCode()); } else { return httpCon.getInputStream(); } } else if(con instanceof FtpURLConnection){ ftpCon = (FtpURLConnection)con; return ftpCon.getInputStream(); } } catch (Exception e) { e.printstacktrace(); }finally{ if(httpCon != null) httpCon.disconnect(); } return null; } public static void main(String[] args) { // 1图片本地存储大小 OutputStream fout = null; InputStream input = null; try { fout = new FileOutputStream("F:" + File.separator + "1.jpg"); input = getInputStream("http://192.168.1.200/t.jpg"); byte[] buffer = new byte[1024]; int count = 0 ; while((count=input.read(buffer)) != -1){ fout.write(buffer, 0, count); } fout.flush(); } catch (Exception e) { e.printstacktrace(); } finally{ try { if(input != null) input.close(); if(fout != null) fout.close(); } catch (IOException e) { e.printstacktrace(); } } // 2是否可以构建图片 try { input = getInputStream("http://192.168.1.200/t.jpg"); ImageInputStream iis = ImageIO.createImageInputStream(input); if(iis != null) { Iterator it = ImageIO.getimageReaders(iis); if(!it.hasNext()){ System.out.println("流不完整或不是图片！"); } else { System.out.println(it.next().getFormatName()); } } } catch (Exception e) { e.printstacktrace(); } } }
图片压缩采用thumbnailator,可以按大小、按比例、按质量压缩并增加水印，API简单
package com.sunshine.monitor.comm.util.compress; import java.io.ByteArrayInputStream; import java.io.ByteArrayOutputStream; import java.io.File; import java.io.FileInputStream; import java.io.IOException; import java.io.InputStream; import javax.imageio.ImageIO; import net.coobird.thumbnailator.Thumbnails; import net.coobird.thumbnailator.geometry.Positions; /** * 图片压缩:按大小、按比例压缩、按质量 * 增加水印 * @author OY * */ public abstract class Compresspicturetools { private static float QUALITY = 0.6f; /** * 按大小缩小 * * @param file * @param width * @param height * @return * @throws Exception */ public static byte[] compressOfSize(File file, int width, int height) throws Exception { byte[] bs = null; InputStream input = null; try { input = new FileInputStream(file); bs = compressOfSize(input, width, height); } catch (Exception e) { e.printstacktrace(); } finally { try { if (input != null) input.close(); } catch (IOException e) { e.printstacktrace(); } } return bs; } /** * 按大小缩小 * * @param input 原图 * @param width 目标宽席 * @param height 目标高度 * @return * @throws Exception */ public static byte[] compressOfSize(InputStream input, int width, int height) throws Exception { ByteArrayOutputStream output = null; try { output = new ByteArrayOutputStream(); Thumbnails.of(input).size(width, height).toOutputStream(output); return output.toByteArray(); } catch (IOException e) { e.printstacktrace(); } finally { try { if (output != null) output.close(); } catch (IOException e) { e.printstacktrace(); } } return null; } /** * 按指定比例进行缩小和放大: percent=1不变 percent>1放大 percent1放大 percent
因JDK1.7以下，不可以设置编码，以致中文乱码问题，未采用java.util.ZipOutputStream,而是Apache ant下的ZipOutputStream
package com.sunshine.monitor.comm.util.compress; import java.io.BufferedInputStream; import java.io.File; import java.io.FileInputStream; import java.io.IOException; import java.io.InputStream; import java.io.OutputStream; import java.util.Arrays; import java.util.Collections; import java.util.Iterator; import java.util.List; import java.util.Map; import java.util.Map.Entry; import java.util.Set; import org.apache.tools.zip.ZipEntry; import org.apache.tools.zip.ZipOutputStream; import com.sunshine.monitor.comm.util.http.HttpHelpers; /** * 图片压缩成ZIP,支持并发多线程; * java.util.ZipOutputStream中文乱码 * 方法一、JDK1.7可以设置编码 * 方法二、换成Apache ant * @author OY * */ public class PicturePackZipTools { private static String DEFAULT_COMPRESS_ENCODE = "GBK"; private static ZipOutputStream getZipStreamEncode(OutputStream output, String encode) { ZipOutputStream zipStream = new ZipOutputStream(output); if (encode == null || "".equals(encode)) { zipStream.setEncoding(DEFAULT_COMPRESS_ENCODE); } else { zipStream.setEncoding(encode); } return zipStream; } /** * 访问本地路径下的所有文件 * * @param path * @return */ public static List loadFiles(String path) { List list = null; try { File fold = new File(path); if (fold.isDirectory()) { File[] files = fold.listFiles(); list = Arrays.asList(files); } } catch (Exception e) { e.printstacktrace(); } return list; } /** * 读取本地系统路径下的所有图片打成ZIP * * @param path * @param output * @param compress */ public static void compressZip(String path, OutputStream output, String encode, boolean compress) { List listfiles = null; ZipOutputStream zipStream = null; try { zipStream = getZipStreamEncode(output, encode); listfiles = loadFiles(path); for (File file : listfiles) { compressZip(file, zipStream, compress); } } catch (Exception e) { e.printstacktrace(); } finally { try { if (zipStream != null) { zipStream.close(); } } catch (IOException e) { e.printstacktrace(); } } } /** * 读取网络图片打成打成ZIP * @param urls * key = 图片名, value = 图片URL * @param output * @param encode 编码 * @param compress 是否压缩 */ public static void compressZip(Map urls, OutputStream output, String encode, boolean compress) { ZipOutputStream zipStream = null; try { zipStream = getZipStreamEncode(output, encode); Map synUrls = Collections.synchronizedMap(urls); Set> set = synUrls.entrySet(); Iterator> it = set.iterator(); while (it.hasNext()) { Entry entry = it.next(); compressZip(entry.getValue(), zipStream, entry.getKey(), compress); } } catch (Exception e) { e.printstacktrace(); } finally { try { if (zipStream != null) { zipStream.close(); } } catch (IOException e) { e.printstacktrace(); } } } /** * 压缩单个文件为ZIP * @param file * @param output * @param encode * @param compress */ public static void compressZip(File file, OutputStream output, String encode, boolean compress) throws Exception{ FileInputStream input = null; try { input = new FileInputStream(file); compressZip(input,file.getName(),output,encode,compress); } catch (Exception e) { e.printstacktrace(); } finally { try { if (input != null) input.close(); } catch (IOException e) { e.printstacktrace(); } } } /** * 压缩单个文件为ZIP * @param input * @param fileName * @param output * @param encode * @param compress */ public static void compressZip(InputStream input, String fileName, OutputStream output, String encode, boolean compress) throws Exception { ZipOutputStream zipStream = null; try { zipStream = getZipStreamEncode(output, encode); zip(input, zipStream, fileName, compress); } catch (Exception e) { e.printstacktrace(); } finally { try { if (zipStream != null) zipStream.close(); } catch (IOException e) { e.printstacktrace(); } } } /** * 本地图片 */ private static void compressZip(File file, ZipOutputStream zipStream, boolean compress) throws Exception{ FileInputStream input = null; try { input = new FileInputStream(file); zip(input, zipStream, file.getName(), compress); } catch (Exception e) { e.printstacktrace(); }finally{ try { if(input != null) input.close(); } catch (IOException e) { e.printstacktrace(); } } } /** * 网络图片 * * @param url * @param zipStream * @param compress */ private static void compressZip(String url, ZipOutputStream zipStream, String fileName, boolean compress) throws Exception{ InputStream input = null; try { input = HttpHelpers.getInputStream(url); zip(input, zipStream, fileName, compress); } catch (Exception e) { e.printstacktrace(); } finally{ try { if(input != null) input.close(); } catch (IOException e) { e.printstacktrace(); } } } /** * @param input * @param zipStream * @param zipEntryName * @param compress */ private static void zip(InputStream input, ZipOutputStream zipStream, String zipEntryName, boolean compress) throws Exception{ byte[] bytes = null; BufferedInputStream bufferStream = null; try { if(input == null) throw new Exception("获取压缩的数据项失败! 数据项名为：" + zipEntryName); // 压缩条目不是具体独立的文件，而是压缩包文件列表中的列表项，称为条目，就像索引一样 ZipEntry zipEntry = new ZipEntry(zipEntryName); // 定位到该压缩条目位置，开始写入文件到压缩包中 zipStream.putNextEntry(zipEntry); if (compress) { bytes = Compresspicturetools.compressOfQuality(input, 0); zipStream.write(bytes, 0, bytes.length); } else { bytes = new byte[1024 * 5];// 读写缓冲区 bufferStream = new BufferedInputStream(input);// 输入缓冲流 int read = 0; while ((read = bufferStream.read(bytes)) != -1) { zipStream.write(bytes, 0, read); } } } catch (IOException e) { e.printstacktrace(); } finally { try { if (null != bufferStream) bufferStream.close(); } catch (IOException e) { e.printstacktrace(); } } } }
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