| 方法1:缩略图只要10行代码就够了,前面介绍过N次了.自己不能往前找找吗?Image src = ToolKit.getToolKit().createImage("文件路径");然后先生成一个BufferedImage bi作为画布.BufferedImage bi = new BufferedImage（目标宽, 目标高,BufferedImage.TYPE_INT_RGB);得到它的Graphics对象:Graphics g = bi.getGraphics();然后往这个画而上画原图就行了:g.grawImage(src,0,0,目标宽,目标高,null);找一个编码类,如JPEGEncoder,GIFEncoder把bi编码输出就行了.方法2:import javax.imageio.ImageIO;import javax.imageio.IIOException;import java.awt.image.BufferedImage;import java.awt.Image;import java.io.File;import java.awt.image.AffineTransformOp;import java.awt.geom.AffineTransform;public class Test { public static void main (String argv[]) { try { File fi = new File("C:/1.jpg"); //大图文件 File fo = new File("C:/2.jpg"); //将要转换出的小图文件 AffineTransform transform = new AffineTransform(); BufferedImage bis = ImageIO.read(fi); int w = bis.getWidth(); int h = bis.getHeight(); double scale = (double)w/h; int nw = 120; int nh = (nw * h) / w; if(nh>120) { nh = 120; nw = (nh * w) / h; } double sx = (double)nw / w; double sy = (double)nh / h; transform.setToScale(sx,sy); AffineTransformOp ato = new AffineTransformOp(transform, null); BufferedImage bid = new BufferedImage(nw, nh, BufferedImage.TYPE_3BYTE_BGR); ato.filter(bis,bid); ImageIO.write(bid, "jpeg", fo); } catch(Exception e) { e.printStackTrace(); } }} |
