ajaxFileUpload 异步上传文件简单使用

<%@ page language="java" contentType="text/html; charset=UTF-8"  
    pageEncoding="UTF-8"%>  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  

  
    
  

package com.yangshidesign.weixinface.servlet;  
  
import java.io.File;  
import java.io.IOException;  
import java.util.List;  
  
import javax.servlet.ServletContext;  
import javax.servlet.ServletException;  
import javax.servlet.annotation.WebServlet;  
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;  
  
import com.alibaba.fastjson.JSONObject;  
  
/** 
 * Servlet implementation class FileUploadServlet 
 */  
@WebServlet("/FileUploadServlet")  
public class FileUploadServlet extends HttpServlet {  
    private static final long serialVersionUID = 1L;  
  
    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {  
        response.getWriter().println("ppppppppppppppppppp");  
    }  
  
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {  
        //需要返回的fileName  
        String fileName = null;  
          
        //参考资料  http://commons.apache.org/proper/commons-fileupload/using.html  
        // Check that we have a file upload request  
        boolean isMultipart = ServletFileUpload.isMultipartContent(request);  
          
        // Create a factory for disk-based file items  
        DiskFileItemFactory factory = new DiskFileItemFactory();  
  
        // Configure a repository (to ensure a secure temp location is used)  
        ServletContext servletContext = this.getServletConfig().getServletContext();  
        File repository = (File) servletContext.getAttribute("javax.servlet.context.tempdir");  
        factory.setRepository(repository);  
  
        // Create a new file upload handler  
        ServletFileUpload upload = new ServletFileUpload(factory);  
  
        // Parse the request  
        try {  
            List items = upload.parseRequest(request);  
            for(FileItem item : items) {  
                //其他参数  
                String type = item.getContentType();  
                if(type == null) {  
//                  System.out.println(item.getString(item.getFieldName()));  
                    continue;  
                }  
                  
                //文件参数  
                fileName = item.getName();  
                  
                //设置保存文件路径  
                String realPath = request.getServletContext().getRealPath("/image");  
                File dir = new File(realPath);  
                File f = new File(dir, fileName);  
                  
                if(f.exists()) {  
                    f.delete();  
                }  
                f.createNewFile();  
                  
                //保存  
                item.write(f);  
                  
            }  
        } catch (FileUploadException e) {  
            e.printStackTrace();  
        } catch (Exception e) {  
            e.printStackTrace();  
        }  
          
        //返回结果  
        JSONObject obj = new JSONObject();  
        obj.put("fileName", fileName);  
        response.getWriter().print(obj.toJSONString());  
    }  
  
}

需要用到的一个js文件：（点击下载）

ajaxfileupload.js

两个jar包：

commons-io-2.4.jar

commons-fileupload-1.3.1.jar

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下载

注意：上传成功之后没有执行回调函数。

打开ajaxfileupload.js拉到底下找到

if ( type == "json" ) {  
            eval( "data = " + data );  
        }

改成：

if ( type == "json" ) {  
            data = data.replace("
","").replace("
","");  
            //data = eval("("+data.replace("
","").replace("
","")+")");  
        }