问题描述
<div class="iteye-blog-content-contain" style="font-size: 14px">如题用java实现的</div> 问题补充：请指导小生用什么控件或api
解决方案
GraphicsMagick + im4java 可以实现 ，而且生成的图片质量很高，已经实践过了。参考一下这个http://my.oschina.net/u/1245614/blog/160051
解决方案二：
package com.test;import java.awt.Color;import java.awt.Graphics2D;import java.awt.Image;import java.awt.image.BufferedImage;import java.awt.image.ConvolveOp;import java.awt.image.Kernel;import java.io.File;import java.io.FileOutputStream;import java.io.InputStream;import org.apache.commons.fileupload.FileItem;import org.apache.log4j.Logger;import com.sun.image.codec.jpeg.JPEGCodec;import com.sun.image.codec.jpeg.JPEGImageEncoder;/** * 图片缩放 * @author db2admin * */public class ImageUtil {/** * Logger for this class */private static final Logger logger = Logger.getLogger(ImageUtil.class);public void imageScale(String srcFilePath, String targetFilePath,int width, int height) {this.imageScale(new File(srcFilePath), new File(targetFilePath), width,height);}public void imageScale(File srcFile, File targetFile, int width, int height) {try {Image image = javax.imageio.ImageIO.read(srcFile);image = image.getScaledInstance(width, height,Image.SCALE_AREA_AVERAGING);// Make a BufferedImage from the Image.BufferedImage mBufferedImage = new BufferedImage(width, height,BufferedImage.TYPE_INT_RGB);Graphics2D g2 = mBufferedImage.createGraphics();g2.drawImage(image, 0, 0, width, height, Color.white, null);g2.dispose();float[] kernelData2 = { -0.125f, -0.125f, -0.125f, -0.125f, 2,-0.125f, -0.125f, -0.125f, -0.125f };Kernel kernel = new Kernel(3, 3, kernelData2);ConvolveOp cOp = new ConvolveOp(kernel, ConvolveOp.EDGE_NO_OP, null);mBufferedImage = cOp.filter(mBufferedImage, null);File targetDir = targetFile.getParentFile();if (!targetDir.exists())targetDir.mkdirs();FileOutputStream out = new FileOutputStream(targetFile);JPEGImageEncoder encoder = JPEGCodec.createJPEGEncoder(out);encoder.encode(mBufferedImage);out.close();} catch (Exception e) {logger.error("imageScale(String, String, int, int) - 图片压缩出错 - srcFilePath="+ srcFile.getPath() + ", targeFilePath="+ targetFile.getPath() + ", width=" + width+ ", height=" + height, e);}}public void imageScale(FileItem fileItem, String targetFilePath, int width,int height) {try {InputStream input = fileItem.getInputStream();Image image = javax.imageio.ImageIO.read(input);image = image.getScaledInstance(width, height,Image.SCALE_AREA_AVERAGING);BufferedImage mBufferedImage = new BufferedImage(width, height,BufferedImage.TYPE_INT_RGB);Graphics2D g2 = mBufferedImage.createGraphics();g2.drawImage(image, 0, 0, width, height, Color.white, null);g2.dispose();float[] kernelData2 = { -0.125f, -0.125f, -0.125f, -0.125f, 2,-0.125f, -0.125f, -0.125f, -0.125f };Kernel kernel = new Kernel(3, 3, kernelData2);ConvolveOp cOp = new ConvolveOp(kernel, ConvolveOp.EDGE_NO_OP, null);mBufferedImage = cOp.filter(mBufferedImage, null);File target = new File(targetFilePath);File targetDir = target.getParentFile();if (!targetDir.exists())targetDir.mkdirs();FileOutputStream out = new FileOutputStream(targetFilePath);JPEGImageEncoder encoder = JPEGCodec.createJPEGEncoder(out);encoder.encode(mBufferedImage);out.close();input.close();} catch (Exception e) {logger.error("imageScale(String, String, int, int) - 图片压缩出错 - fileItem="+ fileItem.getName() + ", targetFilePath="+ targetFilePath + ", width=" + width + ", height="+ height, e);}}public static void main(String[] args) {ImageUtil iu=new ImageUtil();iu.imageScale("e:/2.jpg", "e:/1.jpg", 270, 220);}}看看有没有用
解决方案三：
1你是要做上传头像吗？如果是http://download.csdn.net/detail/quadrapop/6552799(开源的、稍微改改就行）2如果不是，上传图片可以用jquery file upload（https://github.com/blueimp/jQuery-File-Upload/wiki）这里有java的例子代码，写好的图片处理可以用java awt的image api