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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("https://cache.yisu.com/upload/information/20201203/112/1.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("https://cache.yisu.com/upload/information/20201203/112/1.jpg");
ImageInputStream iis = ImageIO.createImageInputStream(input);
if(iis != null) {
Iterator<ImageReader> 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 percent<1缩小
*
* @param input 原图
* @param percent 压缩比例
* @return
* @throws Exception
*/
public static byte[] compressOfPercent(InputStream input, float percent)
throws Exception {
ByteArrayOutputStream output = null;
try {
output = new ByteArrayOutputStream();
Thumbnails.of(input).scale(percent).toOutputStream(output);
return output.toByteArray();
} catch (Exception 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 percent<1缩小
*
* @param file 原图
* @param percent 压缩比例
*/
public static byte[] compressOfPercent(File file, float percent)
throws Exception {
byte[] bs = null;
InputStream input = null;
try {
input = new FileInputStream(file);
bs = compressOfPercent(input, percent);
} catch (Exception e) {
e.printStackTrace();
} finally {
try {
if (input != null)
input.close();
} catch (IOException e) {
e.printStackTrace();
}
}
return bs;
}
/**
* 按质量压缩:图片尺寸不变，压缩图片文件大小
*
* @param file 原图
* @param quality
* =1为最高质量
* @return
* @throws Exception
*/
public static byte[] compressOfQuality(File file, float quality)
throws Exception {
byte[] bs = null;
InputStream input = null;
try {
input = new FileInputStream(file);
bs = compressOfQuality(input, quality);
} catch (Exception e) {
e.printStackTrace();
} finally {
try {
if (input != null)
input.close();
} catch (IOException e) {
e.printStackTrace();
}
}
return bs;
}
/**
* 按质量压缩:图片尺寸不变，压缩图片文件大小
*
* @param input 原图
* @param quality
* =1为最高质量
* @return
* @throws Exception
*/
public static byte[] compressOfQuality(InputStream input, float quality)
throws Exception {
ByteArrayOutputStream output = null;
try {
output = new ByteArrayOutputStream();
if(quality == 0){
Thumbnails.of(input).scale(1f).outputQuality(QUALITY)
.toOutputStream(output);
} else {
Thumbnails.of(input).scale(1f).outputQuality(quality)
.toOutputStream(output);
}
return output.toByteArray();
} catch (Exception e) {
e.printStackTrace();
} finally {
try {
if (output != null)
output.close();
} catch (IOException e) {
e.printStackTrace();
}
}
return null;
}
/**
* 图片右下角添加水印
*
* @param fromPic
* 原图
* @param markPic
* 水印图
* @param transparent
* 透明度
* @return
* @throws Exception
*/
public static byte[] waterMark(byte[] fromPic, InputStream markPic,
float transparent) throws Exception {
InputStream finput = null;
ByteArrayOutputStream output = null;
try {
finput = new ByteArrayInputStream(fromPic);
output = new ByteArrayOutputStream();
Thumbnails
.of(finput)
.scale(1f)
.watermark(Positions.BOTTOM_RIGHT, ImageIO.read(markPic),
transparent).toOutputStream(output);
return output.toByteArray();
} catch (Exception e) {
e.printStackTrace();
} finally {
try {
if (output != null)
output.close();
if (finput != null)
finput.close();
} catch (IOException e) {
e.printStackTrace();
}
}
return null;
}
/**
* 图片格式转换
*
* @param fromPic
* 原图
* @param picFormat
* 格式 png,jpg...
* @return
* @throws Exception
*/
public static byte[] transferPicFormat(byte[] fromPic, String picFormat)
throws Exception {
ByteArrayInputStream finput = null;
ByteArrayOutputStream output = null;
try {
finput = new ByteArrayInputStream(fromPic);
output = new ByteArrayOutputStream();
Thumbnails.of(finput).outputFormat(picFormat)
.toOutputStream(output);
return output.toByteArray();
} catch (Exception e) {
e.printStackTrace();
} finally {
try {
if (output != null)
output.close();
if (finput != null)
finput.close();
} catch (IOException e) {
e.printStackTrace();
}
}
return null;
}
} 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<File> loadFiles(String path) {
List<File> 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<File> 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<String, String> urls,
OutputStream output, String encode, boolean compress) {
ZipOutputStream zipStream = null;
try {
zipStream = getZipStreamEncode(output, encode);
Map<String, String> synUrls = Collections.synchronizedMap(urls);
Set<Entry<String, String>> set = synUrls.entrySet();
Iterator<Entry<String, String>> it = set.iterator();
while (it.hasNext()) {
Entry<String, String> 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();
}
}
}
} 上述就是小编为大家分享的利用Java怎么将图片进行压缩并打包成ZIP文件了，如果刚好有类似的疑惑，不妨参照上述分析进行理解。如果想知道更多相关知识，欢迎关注亿速云行业资讯频道。
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