关于图片的一些处理 博客分类： JQueryJ2SE 图片合成裁剪base64水印
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2024-03-25 13:17:40
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一些图片处理：
//两张图片合成
public static void composePic(String filesrc,String logosrc,String outsrc,int x,int y) throws Exception {
try {
File bgfile = new File(filesrc);
Image bg_src = javax.imageio.ImageIO.read(bgfile);
File logofile = new File(logosrc);
Image logo_src = javax.imageio.ImageIO.read(logofile);
int bg_width = bg_src.getWidth(null);
int bg_height = bg_src.getHeight(null);
int logo_width = logo_src.getWidth(null);;
int logo_height = logo_src.getHeight(null);
BufferedImage tag = new BufferedImage(bg_width, bg_height, BufferedImage.TYPE_INT_RGB);
Graphics2D g2d = tag.createGraphics();
g2d.drawImage(bg_src, 0, 0, bg_width, bg_height, null);
g2d.setComposite(AlphaComposite.getInstance(AlphaComposite.SRC_ATOP,1.0f)); //透明度设置开始
g2d.drawImage(logo_src,x,y,logo_width,logo_height, null);
g2d.setComposite(AlphaComposite.getInstance(AlphaComposite.SRC_OVER)); //透明度设置 结束
FileOutputStream out = new FileOutputStream(outsrc);
JPEGImageEncoder encoder = JPEGCodec.createJPEGEncoder(out);
encoder.encode(tag);
out.close();
}catch (Exception e) {
e.printStackTrace();
log.info("图片合成失败:" + e.getMessage());
throw new Exception(e);
}
}
//生成指定大小的图片
public static void createImg(String path, int width, int height) throws Exception{
File file = new File(path);
BufferedImage bi = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
Graphics2D g2 = (Graphics2D)bi.getGraphics();
g2.setBackground(Color.WHITE);
g2.clearRect(0, 0, width, height);
g2.setPaint(Color.RED);
ImageIO.write(bi, "jpg", file);
}
//图片base64编码与解码
public class ImgConvert
{
public static String getBase64(String path) throws Exception
{//将图片文件转化为字节数组字符串，并对其进行Base64编码处理
InputStream in = null;
byte[] data = null;
if(null == path || "".equals(path)) return "";
//读取图片字节数组
File file = new File(path);
in = new FileInputStream(file);
data = new byte[in.available()];
in.read(data);
in.close();
//对字节数组Base64编码
BASE64Encoder encoder = new BASE64Encoder();
return encoder.encode(data);//返回Base64编码过的字节数组字符串
}
public static boolean getImage(String imgStr, String path)
{//对字节数组字符串进行Base64解码并生成图片
if (imgStr == null) //图像数据为空
return false;
BASE64Decoder decoder = new BASE64Decoder();
try
{
//Base64解码
byte[] b = decoder.decodeBuffer(imgStr);
for(int i=0;i<b.length;++i)
{
if(b[i]<0)
{//调整异常数据
b[i]+=256;
}
}
//生成jpeg图片
OutputStream out = new FileOutputStream(path);
out.write(b);
out.flush();
out.close();
return true;
}
catch (Exception e)
{
return false;
}
}
}
//图片上添加文字
public class ImgMessage {
public static void main(String[] args) {
String url = "D:\\Blue.jpg";
}
public String writeMessage(String message, String url, int offsetTop, int offsetLeft) {
try {
// 读取模板图片内容
JPEGImageDecoder decoder = JPEGCodec
.createJPEGDecoder(new FileInputStream(url)); // 读取图片路径
BufferedImage image = decoder.decodeAsBufferedImage();
Graphics2D g = image.createGraphics();// 得到图形上下文
g.setColor(Color.BLACK); // 设置画笔颜色
RenderingHints rh = new RenderingHints(
RenderingHints.KEY_ANTIALIASING,
RenderingHints.VALUE_ANTIALIAS_ON);
rh.put(RenderingHints.KEY_STROKE_CONTROL,
RenderingHints.VALUE_STROKE_PURE);
rh.put(RenderingHints.KEY_ALPHA_INTERPOLATION,
RenderingHints.VALUE_ALPHA_INTERPOLATION_QUALITY);
rh.put(RenderingHints.KEY_TEXT_ANTIALIASING,
RenderingHints.VALUE_TEXT_ANTIALIAS_ON);
rh.put(RenderingHints.KEY_RENDERING,
RenderingHints.VALUE_RENDER_QUALITY);
g.setRenderingHints(rh);
g.setColor(Color.black);
Font font = new Font("宋体", Font.BOLD, 12);
g.setFont(font);
FontMetrics fm = g.getFontMetrics(font);
// 设置换行操作
int fontHeight = fm.getHeight();// 字符的高度
int rowIndex = 1;
int left = offsetLeft;
for (int i = 0; i < message.length(); i++) {
char c = message.charAt(i);
int charWidth = fm.charWidth(c); // 字符的宽度
// 另起一行
if (Character.isISOControl(c)) {
rowIndex++;
left = offsetLeft;
}
g.drawString(String.valueOf(c), left, offsetTop + rowIndex
* fontHeight); // 把一个个写到图片上
left += charWidth; // 设置下字符的间距
}
g.dispose();
String outFileName = url; // 图片要存储的路径
FileOutputStream out = new FileOutputStream(outFileName);// 通过流操作把文字图片结合
JPEGImageEncoder encoder = JPEGCodec.createJPEGEncoder(out);
encoder.encode(image);
out.close();
return outFileName;
} catch (Exception e) {
e.printStackTrace();
return null;
}
}
}
//图片裁剪
/**
* 按前台截取的大小对原图进行截取
*
* @param img
* 原图文件
* @param dest
* 保存地址
* @param top
* 左上角点的Y
* @param left
* 左上角点的X
* @param width
* 图片的宽度
* @param height
* 图片的高度
* @param type
* 图片类型
* @return
* @throws IOException
*/
public static void resizeImage(File img, String dest, int top, int left,
int width, int height, String type) throws Exception {
try{
File fileDest = new File(dest);
BufferedImage bi = (BufferedImage) ImageIO.read(img);
BufferedImage bi_cropper = bi.getSubimage(left, top, width, height);
ImageIO.write(bi_cropper, type, fileDest);
}catch(Exception e){
e.printStackTrace();
log.error("图片裁剪失败:" + e.getMessage());
throw new Exception(e.getMessage());
}
}
/**
* 对gif图形进行裁剪
* @param img
* @param dest
* @param top
* @param left
* @param width
* @param height
*/
public void resizeGifImage(File img, String dest, int top, int left, int width, int height){
File des = new File(dest);
GifImage gif;
try {
gif = GifDecoder.decode(img);
Rectangle rect = new Rectangle(top, left, width, height-3);
GifImage cropIMG = GifTransformer.crop(gif, rect);
GifEncoder.encode(cropIMG, des);
} catch (IOException e) {
e.printStackTrace();
}
}
jquery插件:
easydrag: 一个简单的拖放插件，可用于获取拖放div的id再获取位置(top,left)，有需要可以通过iframe进行限制以获取准确的top,left。 jquery.form: 以ajax方式提交form表单。 jcarousel: 可横向和纵向的滚动显示图片。jcrop: 裁剪插件。 kindeditor:一个在线编辑插件，部分功能可单独使用，如取色器。
java以积竖线分隔split("\\|");
js的replace替换所有逗号replace(/,/g, '_')应用正则，得去学习学习正则。