Java压缩图片工具类 悟寰轩

import java.awt.Image;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;

import javax.imageio.ImageIO;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import com.sun.image.codec.jpeg.JPEGCodec;
import com.sun.image.codec.jpeg.JPEGImageEncoder;
public class CompressPicUtils {
private static final Logger logger = LoggerFactory.getLogger(CompressPicUtils.class);
private File inputFile; // 文件对象
private File outputFile; // 输出图路径
private int outputWidth; // 默认输出图片宽
private int outputHeight; // 默认输出图片高
private boolean proportion = true; // 是否等比缩放标记(默认为等比缩放)
public CompressPicUtils() {
}
public boolean compressPic() {
try {
// 获得源文件
if (!inputFile.exists()) {
return false;
}
Image img = ImageIO.read(inputFile);
// 判断图片格式是否正确
if (img.getWidth(null) == -1) {
return false;
} else {
int newWidth;
int newHeight;
// 判断是否是等比缩放
if (this.proportion == true) {
// 为等比缩放计算输出的图片宽度及高度
double rate1 = ((double) img.getWidth(null)) / (double) outputWidth + 0.1;
double rate2 = ((double) img.getHeight(null)) / (double) outputHeight + 0.1;
// 根据缩放比率大的进行缩放控制
double rate = rate1 > rate2 ? rate1 : rate2;
newWidth = (int) (img.getWidth(null) / rate);
newHeight = (int) (img.getHeight(null) / rate);
} else {
newWidth = outputWidth; // 输出的图片宽度
newHeight = outputHeight; // 输出的图片高度
}
BufferedImage tag = new BufferedImage(newWidth, newHeight, BufferedImage.TYPE_INT_RGB);
tag.getGraphics().drawImage(img.getScaledInstance(newWidth, newHeight, Image.SCALE_SMOOTH), 0, 0, null);
FileOutputStream out = new FileOutputStream(outputFile);
// JPEGImageEncoder可适用于其他图片类型的转换
JPEGImageEncoder encoder = JPEGCodec.createJPEGEncoder(out);
encoder.encode(tag);
out.close();
}
} catch (IOException ex) {
logger.error("compressPic error", ex);
return false;
}
return true;
}
public boolean compressPic(File inputFile, File outputFile, int width, int height, boolean gp) {
// 输入图路径
this.inputFile = inputFile;
// 输出图路径
this.outputFile = outputFile;
// 设置图片长宽
this.outputWidth = width;
this.outputHeight = height;
// 是否是等比缩放 标记
this.proportion = gp;
return compressPic();
}
}