jquery图片预览与裁剪

package cn.com.ajava.servlet; import java.awt.Rectangle; import java.io.File; import java.io.FileInputStream; import java.io.IOException; import java.io.PrintWriter; import java.util.Date; import java.util.Iterator; import javax.imageio.ImageIO; import javax.imageio.ImageReadParam; import javax.imageio.ImageReader; import javax.imageio.stream.ImageInputStream; import javax.servlet.ServletException; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; public class ServletImage extends HttpServlet { private static final long serialVersionUID = 1L; /** * @see HttpServlet#HttpServlet() */ public ServletImage() { super(); // TODO Auto-generated constructor stub } /** * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse * response) */ protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { // TODO Auto-generated method stub } /** * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse * response) */ protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { String systemPath = request.getContextPath(); String basePath = request.getScheme() + "://" + request.getServerName() + ":" + request.getServerPort() + systemPath + "/"; int x1 = Integer.valueOf((String) request.getParameter("x")); int y1 = Integer.valueOf((String) request.getParameter("y")); int w = Integer.valueOf((String) request.getParameter("w")); int h = Integer.valueOf((String) request.getParameter("h")); String filePath = (String) request.getParameter("img"); FileInputStream is = null; ImageInputStream iis = null; try { String currentDirPath = this.getServletConfig().getServletContext().getRealPath(filePath); is = new FileInputStream(currentDirPath); Iterator<ImageReader> it = ImageIO.getImageReadersByFormatName("jpg"); ImageReader reader = it.next(); iis = ImageIO.createImageInputStream(is); reader.setInput(iis, true); ImageReadParam param = reader.getDefaultReadParam(); Rectangle rect = new Rectangle(x1, y1, w, h); param.setSourceRegion(rect); java.awt.image.BufferedImage bi = reader.read(0, param); String savePath = "D:/Tomcat6/webapps/JavaImage/jcrop/upload"; String fileName = new Date().getTime()+".jpg"; File file1 = new File(savePath); if (!file1.exists()) { file1.mkdirs(); } ImageIO.write(bi, "jpg", new File(savePath +"/"+fileName)); String webPath = filePath.substring(0, filePath.lastIndexOf("/")); String responseText = basePath + "jcrop/upload" + "/"+fileName; PrintWriter out = response.getWriter(); out.print(responseText); //System.out.println(responseText); } catch (Exception e) { e.printStackTrace(); } finally { if (is != null) is.close(); if (iis != null) iis.close(); } } }