1 菜单图片jpg存储大小最小，一般尺寸160*120，或者210*158。指定大小，压缩存储，每张8kb内
1 public static void main(String[] args) throws Exception { 2 File oldFile = new File("e:/白菜肉片炖粉条.png"); 3 try { 4 Image srcFile = ImageIO.read(oldFile); 5 String srcImgPath = "e:/白菜肉片炖粉条7.png"; //存成jpg格式 6 //BufferedImage buffImg = new BufferedImage(160, 120, BufferedImage.TYPE_INT_ARGB); 7 BufferedImage buffImg = new BufferedImage(160, 120, BufferedImage.TYPE_INT_RGB); 8 Graphics2D graphics = buffImg.createGraphics(); 9 graphics.setBackground(new Color(255,255,255)); 10 graphics.setColor(new Color(255,255,255)); 11 graphics.fillRect(0, 0, 160, 120); 12 graphics.drawImage(srcFile.getScaledInstance(160, 120, Image.SCALE_SMOOTH), 0, 0, null); 13 ImageIO.write(buffImg, "jpg", new File(srcImgPath)); 14 } catch (Exception e) { 15 e.printStackTrace(); 16 } 17 }
2 读取文件夹中图片
1 public static void main(String[] args) throws Exception { 2 String URL="f:/xx/";//URL为文件夹目录 3 File file=new File(URL); 4 if (file.isDirectory()){//判断file是否是文件目录 若是返回TRUE 5 String name[]=file.list();//name存储file文件夹中的文件名 6 for (int i=0; i<name.length; i++){ 7 File oldFile=new File(URL, name[i]);//此时就可得到文件夹中的文件 8 System.out.println(name[i]);//五色金针菇.png 京酱肉丝.png 9 // oldFile.delete();//删除文件 10 } 11 } 12 }
3 二合一
1 public static void main(String[] args) throws Exception { 2 String oldUrl="f:/xx/";//文件源 3 String newUrl="f:/png/";//存储文件夹 4 File f2=new File(newUrl); 5 if(!f2.exists()){ 6 f2.mkdir();//如果目录不存在，新建 7 } 8 File file=new File(oldUrl); 9 if(!file.exists()){ 10 throw new Exception("文件不存在！"); 11 } 12 /*BufferedImage bi1 = ImageIO.read(file); 13 if(bi1 == null){ 14 System.out.println("此文件不为图片文件"); 15 }*/ 16 if (file.isDirectory()){//判断file是否是文件目录 若是返回TRUE 17 String name[]=file.list();//name存储file文件夹中的文件名 18 for (int i=0; i<name.length; i++){ 19 File oldFile=new File(oldUrl, name[i]);//此时就可得到文件夹中的文件 20 System.out.println(name[i]);//五色金针菇.png 京酱肉丝.png 21 Image srcFile = ImageIO.read(oldFile); 22 String srcImgPath = newUrl+name[i].split("[.]")[0]+".png"; //存成jpg格式 23 //BufferedImage buffImg = new BufferedImage(160, 120, BufferedImage.TYPE_INT_ARGB); 24 BufferedImage buffImg = new BufferedImage(160, 120, BufferedImage.TYPE_INT_RGB); 25 Graphics2D graphics = buffImg.createGraphics(); 26 graphics.setBackground(new Color(255,255,255)); 27 graphics.setColor(new Color(255,255,255)); 28 graphics.fillRect(0, 0, 160, 120); 29 graphics.drawImage(srcFile.getScaledInstance(160, 120, Image.SCALE_SMOOTH), 0, 0, null); 30 ImageIO.write(buffImg, "jpg", new File(srcImgPath)); 31 } 32 } 33 }
4 读text文件 （1句柄file 2 in 3 ib ）
截图http://blog.csdn.net/lql876381722/article/details/2203512
public static void main(String[] args) throws IOException {
File f1 = new File("e:/a.jpg");
FileInputStream is = new FileInputStream(f1);
//获取图片流
ImageInputStream iis = ImageIO.createImageInputStream(is);
System.out.println(f1);
Iterator<ImageReader> it = ImageIO.getImageReadersByFormatName("jpg");
ImageReader reader = it.next();
reader.setInput(iis,true) ;
ImageReadParam param = reader.getDefaultReadParam();
Rectangle rect = new Rectangle(0,0,100,100);
param.setSourceRegion(rect);
BufferedImage bi = reader.read(0,param);
ImageIO.write(bi, "jpg", new File("e:/te.jpg"));
}