public static boolean compresspic(string srcfilepath, string descfilepath) throws ioexception{图片无损压缩的相关问题可以到网站了解，为您耐心解答问题，相信可以帮到您，值得您的信赖和支持。
file file =null;
bufferedimage src =null;
fileoutputstream out=null;
// 指定写图片的方式为 jpg
imagewriterimgwrier=imageio.getimagewritersbyformatname("jpg").next();
imagewriteparam imgwriteparams =new imagewriteparam(null);
// 要使用压缩，必须指定压缩方式为mode_explicit
imgwriteparams.setcompressionmode(imgwriteparams.mode_explicit);
// 这里指定压缩的程度，参数qality是取值0~1范围内，
imgwriteparams.setcompressionquality((float)1);
imgwriteparams.setprogressivemode(imgwriteparams.mode_disabled);
colormodel colormodel =imageio.read(new file(srcfilepath)).getcolormodel();// colormodel.getrgbdefault();
imgwriteparams.setdestinationtype(new javax.imageio.imagetypespecifier(
colormodel, colormodel.createcompatiblesamplemodel(16, 16)));
try {
if (stringutils.isempty(srcfilepath)) {
return false;
} else {
file =new file(srcfilepath);
system.out.println(file.length());
src = imageio.read(file);
out=new fileoutputstream(descfilepath);
imgwrier.reset();
// 必须先指定 out值，才能调用write方法, imageoutputstream可以通过任何
// outputstream构造
imgwrier.setoutput(imageio.createimageoutputstream(out));
// 调用write方法，就可以向输入流写图片
imgwrier.write(null, new iioimage(src, null, null),
imgwriteparams);
out.flush();
out.close();
}
} catch (exception e) {
e.printstacktrace();
return false;
}
return true;
}