转换成略缩图 、
java.awt.Image bigJpg = javax.imageio.ImageIO.read(new java.io.File(filePath));
为什么这样 bigJpg 总是null 空的、
正常这种情况下、bigJpg 应该是BufferedImage类型、急求高手现身！！！谢谢
/// 上传略缩图的方法如下代码：
public static void toSmaillImg(String filePath,String thumbPath) throws Exception{
String newurl =thumbPath; //新的缩略图保存地址
java.awt.Image bigJpg = javax.imageio.ImageIO.read(new java.io.File(filePath)); //bigJpg 总是空的、 请勿回复地址什么的错误 谢谢！！！
if(bigJpg != null){
float tagsize = 200;
int old_w = bigJpg.getWidth(null);
int old_h = bigJpg.getHeight(null);
int new_w = 0;
int new_h = 0;
float tempdouble;
tempdouble = old_w > old_h ? old_w/tagsize : old_h/tagsize;
new_w = Math.round(old_w/tempdouble);
new_h = Math.round(old_h/tempdouble); //计算新图长宽
java.awt.image.BufferedImage tag = new java.awt.image.BufferedImage(new_w,new_h,java.awt.image.BufferedImage.TYPE_INT_RGB);
tag.getGraphics().drawImage(bigJpg,0,0,new_w,new_h,null); //绘制缩小后的图
FileOutputStream newimage = new FileOutputStream(newurl);
com.sun.image.codec.jpeg.JPEGImageEncoder encoder = com.sun.image.codec.jpeg.JPEGCodec.createJPEGEncoder(newimage);
encoder.encode(tag);
newimage.close();
}
}
额，不好意思，确实没仔细看。。。
