


Detailed introduction to the example code of java intercepting pictures based on coordinates
这篇文章主要介绍了java 根据坐标截取图片实例代码的相关资料,需要的朋友可以参考下
java 根据坐标截取图片
实例代码:代码中有不是注释,很好看懂!
package com.json.test; import java.awt.Rectangle; import java.awt.image.BufferedImage; import java.io.File; import java.io.FileInputStream; import java.io.IOException; import java.util.Iterator; import javax.imageio.ImageIO; import javax.imageio.ImageReadParam; import javax.imageio.ImageReader; import javax.imageio.stream.ImageInputStream; public class OperateImage { // ===源图片路径名称如:c:\1.jpg private String srcpath ; // ===剪切图片存放路径名称.如:c:\2.jpg private String subpath ; // ===剪切点x坐标 private int x ; private int y ; // ===剪切点宽度 private int width ; private int height ; public OperateImage() { } public OperateImage( int x, int y, int width, int height) { this .x = x ; this .y = y ; this .width = width ; this .height = height ; } /** * 对图片裁剪,并把裁剪完蛋新图片保存 。 */ public void cut()throws IOException { FileInputStream is = null ; ImageInputStream iis = null ; try { // 读取图片文件 is =new FileInputStream(srcpath); /* * 返回包含所有当前已注册 ImageReader 的 Iterator,这些 ImageReader * 声称能够解码指定格式。 参数:formatName - 包含非正式格式名称 . *(例如 "jpeg" 或 "tiff")等 。 */ Iterator < ImageReader > it=ImageIO.getImageReadersByFormatName("jpg"); ImageReader reader = it.next(); // 获取图片流 iis = ImageIO.createImageInputStream(is); /* * <p>iis:读取源.true:只向前搜索 </p>.将它标记为 ‘只向前搜索'。 * 此设置意味着包含在输入源中的图像将只按顺序读取,可能允许 reader * 避免缓存包含与以前已经读取的图像关联的数据的那些输入部分。 */ reader.setInput(iis, true ) ; /* * <p>描述如何对流进行解码的类<p>.用于指定如何在输入时从 Java Image I/O * 框架的上下文中的流转换一幅图像或一组图像。用于特定图像格式的插件 * 将从其 ImageReader 实现的 getDefaultReadParam 方法中返回 * ImageReadParam 的实例。 */ ImageReadParam param = reader.getDefaultReadParam(); /* * 图片裁剪区域。Rectangle 指定了坐标空间中的一个区域,通过 Rectangle 对象 * 的左上顶点的坐标(x,y)、宽度和高度可以定义这个区域。 */ Rectangle rect = new Rectangle(x, y, width, height); // 提供一个 BufferedImage,将其用作解码像素数据的目标。 param.setSourceRegion(rect); /* * 使用所提供的 ImageReadParam 读取通过索引 imageIndex 指定的对象,并将 * 它作为一个完整的 BufferedImage 返回。 */ BufferedImage bi=reader.read(0,param); // 保存新图片 ImageIO.write(bi,"jpg",new File(subpath)); } finally { if (is != null ) is.close() ; if (iis != null ) iis.close(); } } public int getHeight() { return height; } public void setHeight( int height) { this .height = height; } public String getSrcpath() { return srcpath; } public void setSrcpath(String srcpath) { this .srcpath = srcpath; } public String getSubpath() { return subpath; } public void setSubpath(String subpath) { this .subpath = subpath; } public int getWidth() { return width; } public void setWidth( int width) { this .width = width; } public int getX() { return x; } public void setX( int x) { this .x = x; } public int getY() { return y; } public void setY( int y) { this .y = y; } public static void main(String[] args) { OperateImage operateImage = new OperateImage(20, 20, 100, 100); operateImage.srcpath = "C:/test/1.jpg"; operateImage.subpath = "C:/test/2.jpg"; try { operateImage.cut(); } catch (IOException e) { e.printStackTrace(); } } }
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