java GraphicsMagick+im4java上传图片并生成缩略图，,需要引用下面三个jar包

java GraphicsMagick+im4java上传图片并生成缩略图，,需要引用下面三个jar包

需要引用下面三个jar包

commons-fileupload-1.3.1.jarcommons-io-2.4.jarim4java-1.4.0-1.5.jar

windows下载GraphicsMagick并安装（linux安装上百度），我使用的是GraphicsMagick-1.3.19-Q8

/* * To change this license header, choose License Headers in Project Properties. * To change this template file, choose Tools | Templates * and open the template in the editor. */package com.zoki;import java.io.File;import java.io.IOException;import java.util.Iterator;import java.util.List;import java.util.logging.Level;import java.util.logging.Logger;import javax.servlet.ServletContext;import javax.servlet.ServletException;import javax.servlet.http.HttpServlet;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;import org.apache.commons.fileupload.FileItem;import org.apache.commons.fileupload.disk.DiskFileItemFactory;import org.apache.commons.fileupload.servlet.ServletFileUpload;import org.im4java.core.ConvertCmd;import org.im4java.core.GMOperation;http://www.huiyi8.com/jiaoben//** * * @author zkpursuit */public class FileUploadServlet extends HttpServlet {    /**     * Processes requests for both HTTP <code>GET</code> and <code>POST</code>     * methods.     *     * @param request servlet request     * @param response servlet response     * @throws ServletException if a servlet-specific error occurs     * @throws IOException if an I/O error occurs     */    protected void processRequest(HttpServletRequest request, HttpServletResponse response)            throws ServletException, IOException {        response.setContentType("text/html;charset=UTF-8");        request.setCharacterEncoding("GB2312");        //获取我项目中存储图片的文件夹地址 你要换成你自己的目录        String imageFold = request.getServletContext().getRealPath("/images");        File fold = new File(imageFold);        if (!fold.exists()) {            fold.mkdir();        }        DiskFileItemFactory factory = new DiskFileItemFactory();        ServletContext servletContext = this.getServletConfig().getServletContext();        File repository = (File) servletContext.getAttribute("javax.servlet.context.tempdir");        factory.setRepository(repository);        ServletFileUpload upload = new ServletFileUpload(factory);        try {            List<FileItem> items = upload.parseRequest(request);            Iterator<FileItem> iter = items.iterator();            while (iter.hasNext()) {                FileItem item = iter.next();                if (item.isFormField()) {                    processFormField(item);                } else {                    processUploadedFile(fold, item);                }            }        } catch (Exception ex) {            Logger.getLogger(FileUploadServlet.class.getName()).log(Level.SEVERE, null, ex);        }    }    private void processFormField(FileItem item) {        String name = item.getFieldName();        String value = item.getString();    }    private void processUploadedFile(File parent, FileItem item) throws Exception {        long time = System.currentTimeMillis();        File savedFile = new File(parent, item.getName());        item.write(savedFile);        GMOperation op = new GMOperation();        //待处理图片的绝对路径          op.addImage(savedFile.getAbsolutePath());        //图片压缩比，有效值范围是0.0-100.0，数值越大，缩略图越清晰  s        op.quality(20.0);        //width 和height可以是原图的尺寸，也可以是按比例处理后的尺寸        op.addRawArgs("-resize", "100");        //宽高都为100        //op.addRawArgs("-resize", "100x100");        op.addRawArgs("-gravity", "center");        //op.resize(100, null);          //处理后图片的绝对路径          File smallFile = new File(parent.getAbsolutePath() + "/small");        if(!smallFile.exists()) {            smallFile.mkdir();        }        op.addImage(smallFile.getAbsolutePath() + "/" + item.getName());        // 如果使用ImageMagick，设为false,使用GraphicsMagick，就设为true，默认为false          ConvertCmd convert = new ConvertCmd(true);        String osName = System.getProperty("os.name").toLowerCase();        if (osName.contains("win")) {            //linux下不要设置此值，不然会报错            convert.setSearchPath("D://Program Files//GraphicsMagick-1.3.19-Q8");        }        convert.run(op);        System.out.println((System.currentTimeMillis() - time));        //压缩图片保存    }    // <editor-fold defaultstate="collapsed" desc="HttpServlet methods. Click on the + sign on the left to edit the code.">    /**     * Handles the HTTP <code>GET</code> method.     *     * @param request servlet request     * @param response servlet response     * @throws ServletException if a servlet-specific error occurs     * @throws IOException if an I/O error occurs     */    @Override    protected void doGet(HttpServletRequest request, HttpServletResponse response)            throws ServletException, IOException {        processRequest(request, response);    }    /**     * Handles the HTTP <code>POST</code> method.     *     * @param request servlet request     * @param response servlet response     * @throws ServletException if a servlet-specific error occurs     * @throws IOException if an I/O error occurs     */    @Override    protected void doPost(HttpServletRequest request, HttpServletResponse response)            throws ServletException, IOException {        processRequest(request, response);    }    /**     * Returns a short description of the servlet.     *     * @return a String containing servlet description     */    @Override    public String getServletInfo() {        return "Short description";    }// </editor-fold>}