package com.lovo.utils;
import java.awt.Graphics;
import java.awt.Image;
import java.awt.Toolkit;
import java.awt.image.BufferedImage;
import java.awt.image.CropImageFilter;
import java.awt.image.FilteredImageSource;
import java.awt.image.ImageFilter;
import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.InputStream;
import javax.imageio.ImageIO;
import org.apache.log4j.Logger;
public class CutImgeUtil {
private static Logger logger = Logger.getLogger(CutImgeUtil.class);
/**
* 图片剪切工具类
* @param input 图片输入流
* @param x 截取时的x坐标
* @param y 截取时的y坐标
* @param desWidth 截取的宽度
* @param desHeight 截取的高度
* @param srcWidth 页面图片的宽度
* @param srcHeight 页面图片的高度
* @param newFilePath 保存路径+文件名
* @return
*/
public static boolean cutImge(InputStream input, int x, int y, int desWidth, int desHeight, int srcWidth,int srcHeight,String newFilePath){
boolean cutFlag = true;
try
{
//图片类
Image imge ;
ImageFilter cropFilter;
//读取图片
BufferedImage bi = ImageIO.read(input);
//当剪裁大小小于原始图片大小才执行
if(srcWidth >= desWidth && srcHeight >= desHeight)
{
//获取原始图
Image image = bi.getScaledInstance(srcWidth, srcHeight, Image.SCALE_DEFAULT);
//获取新图
cropFilter = new CropImageFilter(x, y, desWidth, desHeight);
imge = Toolkit.getDefaultToolkit().createImage(new FilteredImageSource(image.getSource(), cropFilter));
BufferedImage tag = new BufferedImage(desWidth, desHeight, BufferedImage.TYPE_INT_RGB);
Graphics g = tag.getGraphics();
g.drawImage(imge, 0, 0, null);
g.dispose();
File out = new File(newFilePath);
// 输出文件
ImageIO.write(tag, "JPEG", out);
}
} catch (Exception e)
{
cutFlag = false;
e.printStackTrace();
logger.error("剪切失败");
}
return cutFlag;
}
}
package com.lovo.utils;
import java.util.Arrays;
import java.util.List;
public class FileUploadCheck {
//支持的文件类型
public static final List ALLOW_TYPES = Arrays.asList("image/jpg","image/jpeg","image/png","image/gif");
//校验文件类型是否是被允许的
public static boolean allowUpload(String postfix){
return ALLOW_TYPES.contains(postfix);
}
}
