extjs+servlet实现图片上传

package rewin.servlet; import java.io.IOException; import javax.servlet.ServletException; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import net.sf.json.JSONObject; import com.jspsmart.upload.File; import com.jspsmart.upload.Files; import com.jspsmart.upload.Request; import com.jspsmart.upload.SmartUpload; public class LoginServlet extends HttpServlet { public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { doPost(request,response); } public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { response.setContentType("text/html;charset=utf-8"); request.setCharacterEncoding("utf-8"); response.setContentType("text/html;charset=gbk"); request.setCharacterEncoding("gbk"); try { // 1:引入SmartUpload SmartUpload su = new SmartUpload(); // 2:设置允许上传的文件扩展名 // 多个用逗号隔开 su.setAllowedFilesList("jpg,jpeg,gif"); // su.setDeniedFilesList(""); // 3:设置允许上传的最大文件体积 // 这里是3m su.setMaxFileSize(3 * 1024 * 1024); // 4:初始化，接受servlet页面提交过来的请求等 su.initialize(this.getServletConfig(), request, response); // 5:上传 su.upload(); // 接受页面提交过来的用户名和密码 Request myreq = su.getRequest(); String name = myreq.getParameter("myname"); String pass = myreq.getParameter("mypass"); // 设定上传文件要另存为的目的地 java.io.File myfile = new java.io.File(this.getServletContext() .getRealPath("/image")); // 如果路径不存在 if (!myfile.exists()) { // 新建一个路径 myfile.mkdir(); } // 拿到上传文件的对象 // Files 封装了所有上传文件 Files files = su.getFiles(); // 拿到单个上传文件 File file = files.getFile(0); // 拿到上传文件的文件名 String fileName = file.getFileName(); // 拿到上传文件的后缀名 String fileExt = file.getFileExt(); // 拿到上传文件的大小 int fileSize = file.getSize(); //对文件重新命名 // 8349384934839489348.jpg String fileTrueName = 1111+"."+fileExt; //设置文件最终保存地址 // /image/2849389348394893.jpg String finalPath = "/image/"+fileTrueName; //另存为 file.saveAs(finalPath); System.out.println("finalPath="+finalPath); JSONObject json=new JSONObject(); json.accumulate("success",true); json.accumulate("skl","石可磊你成功了"); response.getWriter().print(json.toString()); //response.getWriter().print("{success:true,skl:'成功'}"); } catch (Exception ex) { ex.printStackTrace(); } } }