版权声明：本文为博主原创文章，未经博主允许不得转载。 https://blog.csdn.net/boonya/article/details/88849641
Java使用webp代码编译
-
webp-imageio
开源库 下载压缩包到本地进行编译jar，工程用gradle来维护。 -
libwebp
google-developer下载压缩包到本地编译动态链接库-不同平台的动态链接库编译出来是不同的。mac下是.dylib, windowns下是.dll, unix/linux下是.so. 我在mac和linux下编译过，记录下linux下编译过程。 -
compiling
libwebp-0.6.1.tar.gz luciad-webp-imageio-8f9b44b41902.zip
tar -xzvf libwebp-0.6.1.tar.gz
unzip luciad-webp-imageio-8f9b44b41902.zip
mv libwebp-0.6.1 ./luciad-webp-imageio-8f9b44b41902/libwebp
cd luciad-webp-imageio-8f9b44b41902
cmake .
cmake --build .
./gradlew build -x test
- java project
将libwebp-imageio.so放入工程的当前目录，因为默认的java.library.path含工程当前路径。同时引入打好的luciad-webp-imageio-8f9b44b41902-0.6.0-SNAPSHOT.jar引入工程中。如果是maven工程的话，可以把jar先推到远程的仓库里。
- java transfer
image = ImageIO.read(new URL(imageUrl));
// Encode it as webp using default settings
boolean result = ImageIO.write(image, "webp", bos);
- gradle push to repositry
update build.gradle
apply plugin: "maven-publish" //插件required
group = "com.luciad.imageio.webp"
publishing {
publications {
mavenJava(MavenPublication) {
from components.java
}
}
repositories {
maven {
url "http://***"
credentials {
username = ****
password = ****
}
}
}
}
publish
gradle publishMavenPublicationToMavenRepository有时间的话可以自己编译，此处来自：https://www.jianshu.com/p/5827f9063fe9
Webp开源项目
nintha/webp-imageio-core
qwong/j-webp
下载此开源项目没有跑起来，dll包有问题。直接使用0.4.2可以正常使用，下载地址如下：
- http://download.csdn.net/download/geeklei/8163329
- https://download.csdn.net/download/geeklei/8161731
Webp 编解码
编码
package example;
import com.luciad.imageio.webp.WebPWriteParam;
import javax.imageio.IIOImage;
import javax.imageio.ImageIO;
import javax.imageio.ImageWriter;
import javax.imageio.stream.FileImageOutputStream;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;
public class EncodeTest {
public static void main(String args[]) throws IOException {
String inputPngPath = "test_pic/test.png";
String inputJpgPath = "test_pic/test.jpg";
String outputWebpPath = "test_pic/test_.webp";
// Obtain an image to encode from somewhere
BufferedImage image = ImageIO.read(new File(inputJpgPath));
// Obtain a WebP ImageWriter instance
ImageWriter writer = ImageIO.getImageWritersByMIMEType("image/webp").next();
// Configure encoding parameters
WebPWriteParam writeParam = new WebPWriteParam(writer.getLocale());
writeParam.setCompressionMode(WebPWriteParam.MODE_DEFAULT);
// Configure the output on the ImageWriter
writer.setOutput(new FileImageOutputStream(new File(outputWebpPath)));
// Encode
long st = System.currentTimeMillis();
writer.write(null, new IIOImage(image, null, null), writeParam);
System.out.println("cost: " + (System.currentTimeMillis() - st));
}
}
解码
package example;
import com.luciad.imageio.webp.WebPReadParam;
import javax.imageio.ImageIO;
import javax.imageio.ImageReader;
import javax.imageio.stream.FileImageInputStream;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;
public class DecodeTest {
public static void main(String args[]) throws IOException {
System.load("C:\\Users\\admin\\Desktop\\webp\\webp-code\\webp-imageio-core\\src\\main\\resources\\META-INF\\lib\\windows_64\\webp-imageio.dll");
String inputWebpPath = "test_pic/test.webp";
String outputJpgPath = "test_pic/test_.jpg";
String outputJpegPath = "test_pic/test_.jpeg";
String outputPngPath = "test_pic/test_.png";
// Obtain a WebP ImageReader instance
ImageReader reader = ImageIO.getImageReadersByMIMEType("image/webp").next();
// Configure decoding parameters
WebPReadParam readParam = new WebPReadParam();
readParam.setBypassFiltering(true);
// Configure the input on the ImageReader
reader.setInput(new FileImageInputStream(new File(inputWebpPath)));
// Decode the image
BufferedImage image = reader.read(0, readParam);
ImageIO.write(image, "png", new File(outputPngPath));
ImageIO.write(image, "jpg", new File(outputJpgPath));
ImageIO.write(image, "jpeg", new File(outputJpegPath));
}
}