文件上传与处理-优快云博客

本文介绍了一个使用Java Servlet实现的文件上传处理程序AddInsectServlet，该程序利用Apache Commons FileUpload库解析HTTP请求中的文件，并将文件保存到指定路径。同时，通过AjaxUpload插件实现了前端的异步文件上传功能。

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Servlet

import java.io.File;
import java.io.IOException;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

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.FileUploadException;
import org.apache.commons.fileupload.disk.DiskFileItemFactory;
import org.apache.commons.fileupload.servlet.ServletFileUpload;

/**
* Servlet implementation class AddInsectServlet
*/
public class AddInsectServlet extends HttpServlet {
   private static final long serialVersionUID = 1L;
   // private ServletContext sc;
   // private String savePath;

   /**
   * @see HttpServlet#HttpServlet()
   */
   public AddInsectServlet() {
       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

       // 文件磁盘工厂、
       DiskFileItemFactory df = new DiskFileItemFactory();
       // 得到上传文件对象
       ServletFileUpload upload = new ServletFileUpload(df);
       // 1ge long 表示一个字节 1024*1024=1M;
//       upload.setFileSizeMax(1024 * 1024 * 5);

       Map<String, String> map = new HashMap<String, String>();
       String saveName = "";
       try {

           List<FileItem> list = upload.parseRequest(request);

           for (FileItem file : list) {
               // 判断是否为普通的表单、
               if (file.isFormField()) {
                   String name = file.getFieldName();
                   String value = file.getString("utf-8");
                   map.put(name, value);

               } else {

                   String filename = file.getName();
                   filename = new String(filename.getBytes("iso-8859-1"), "utf-8");
                   System.out.println(filename);
                   String savePath = this.getServletContext().getRealPath("/img");
                   System.out.println(savePath);
                   saveName = System.currentTimeMillis() + filename.substring(filename.lastIndexOf("."));
                   System.out.println(saveName);

                   try {
                       System.out.println(">>>>"+savePath + File.separator + saveName);
                       file.write(new File(savePath + File.separator + saveName));
//                       file.write(arg0);
                   } catch (Exception e) {
                       // TODO Auto-generated catch block
                       e.printStackTrace();
                   }

               }

           }

       } catch (FileUploadException e) {
           // TODO Auto-generated catch block
           e.printStackTrace();
       }


       response.getWriter().print("{'newfileName':'"+saveName+"'}");
       // request.getRequestDispatcher("/fileUploadResult.jsp").forward(request,
       // response);// 转向，输出结果
   }

   /**
   * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse
   *      response)
   */
   protected void doPost(HttpServletRequest request, HttpServletResponse response)
           throws ServletException, IOException {
       // TODO Auto-generated method stub
       doGet(request, response);
   }



}

js

$(".addshu").click(function() {
       var ajax2 = new AjaxUpload($("#uploadBtn"), {
           action : "../../../AddInsectServlet",
           type : "POST",
           autoSubmit : true,
           responseType : "json",
           /* name:'myfile', */
           onChange : function(file, ext) {
               if (!(ext && /^(jpg|gif|bmp)$/.test(ext))) {
                   alert("只支持jpg | bmp| gif");
                   return false;
               }
               else {
                   ajax2.submit();
               }
           },
           onComplete : function(file, data) {

               Img2 = data.newfileName;
               $(".showImg2").html("<img src='/forestSystem/img/" + data.newfileName + "' style='width:80px;height:80px;'/>");
           }
       });
   })