基于jsp的AJAX多文件上传的实例

前端  /  管理员 发布于 5年前   269

最近的项目开发中，遇到了一个多文件上传的问题，即在不刷新页面的情况下，上传多个文件至服务器。现总结分享如下：

本文主要采用了基于jsp的ajax，jquery，servlet等技术。

1.upload.jsp

点击上传时，调用对应的fileupload函数，通过ajax将文件异步传送到servlet中处理。注意在文件上载时，所使用的编码类型应当是“multipart/form-data”，它既可以发送文本数据，也支持二进制数据上载。

<%@ page language="java" contentType="text/html; charset=utf-8" pageEncoding="utf-8"%><%String path = request.getContextPath();String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";%><!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"><html><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8"><base href="//article/<%=basePath%>"><title>Insert title here</title><script type="text/javascript" src="//article/js/jquery.js"></script><script type="text/javascript" src="//article/js/ajaxfileupload.js"></script></head><script language="JavaScript" type="text/javascript">  var buildph=0;  var typeph=0;  var planph=0;  function fileupload1(){    if($("#locationphoto").val()==""){      alert("上传文件不能为空!");      return false;    }    var file = $("#locationphoto").val();    var pos=file.lastIndexOf("\\");var fileName=file.substring(pos+1);//获得文件名字                                                                                                                                   $.ajaxFileUpload({                                                                                                                                           url:"PictureServlet";,        contentType:"multipart/form-data; text/xml;charset=utf-8",        secureuri:false,        cache: false,//防止缓存        fileElementId:'locationphoto',        dataType: 'text/xml',        success: function (data) {          document.getElementById("locationspan").innerHTML = fileName;          alert(fileName);        },error: function (data, status, e){          alert("fail");        }      }    );  }  function fileupload2(){    if($("#buildingphoto").val()==""){      alert("上传文件不能为空!");      return false;    }    var file = $("#buildingphoto").val();    var pos=file.lastIndexOf("\\");    var fileName=file.substring(pos+1);    buildph++;    $.ajaxFileUpload({                                                                                                                                           url:"PictureServlet";,        contentType:"multipart/form-data; text/xml;charset=utf-8",        secureuri:false,        cache: false,//防止缓存        fileElementId:'buildingphoto',        dataType: 'text/xml',        success: function (data) {          document.getElementById("buildingspan"+buildph).innerHTML = fileName;          alert(fileName);        },error: function (data, status, e){          alert("fail");        }      }    );  }  function fileupload3(){    if($("#typePhoto").val()==""){      alert("上传文件不能为空!");      return false;    }    var file = $("#typePhoto").val();    var pos=file.lastIndexOf("\\");    var fileName=file.substring(pos+1);    typeph++;    $.ajaxFileUpload({                                                                                                                                           url:"PictureServlet";,        contentType:"multipart/form-data; text/xml;charset=utf-8",        secureuri:false,        cache: false,//防止缓存        fileElementId:'typePhoto',        dataType: 'text/xml',        success: function (data) {          document.getElementById("typespan"+typeph).innerHTML = fileName;          alert(fileName);        },error: function (data, status, e){          alert("fail");        }      }    );  }</script><body><form id="form1" name="form1" method="post" action=""> <table width="663" height="316" align="center">  <tr>   <td height="30" colspan="2">楼盘位置图：    <span id="locationspan" ></span>   <input type="file" name="locationphoto" id="locationphoto" value="this.val()"/>   <input type="button" name="fileLoad1" id="fileLoad1" value="上传" onClick="fileupload1()"/>   </td>  </tr>   <tr>   <td height="30" colspan="2">楼盘照片：   <span id="buildingspan1" ></span>   <span id="buildingspan2" ></span>   <span id="buildingspan3" ></span>   <span id="buildingspan4" ></span>   <input type="file" name="buildingphoto" id="buildingphoto" value="this.val()"/>   <input type="button" name="fileLoad2" id="fileLoad2" value="上传" onClick="fileupload2()"/>   </td>  </tr>    <tr>   <td height="30" colspan="2">楼盘户型图：    <span id="typespan1" ></span>    <span id="typespan2" ></span>    <span id="typespan3" ></span>    <span id="typespan4" ></span>   <input type="file" name="typePhoto" id="typePhoto" value="this.val()"/>   <input type="button" name="fileLoad3" id="fileLoad3" value="上传" onClick="fileupload3()"/>   </td>  </tr> </table></form></body></html>

2.PictureServlet.java

通过该servlet接受jsp上传的数据流，存储到相应路径，并解析出文件名。

package com.servlet;import java.io.BufferedOutputStream;import java.io.DataOutputStream;import java.io.FileOutputStream;import java.io.IOException;import java.io.PrintWriter;import javax.servlet.ServletException;import javax.servlet.ServletInputStream;import javax.servlet.annotation.WebServlet;import javax.servlet.http.HttpServlet;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;import com.realty.base.action.BuildingAction;/** * Servlet implementation class PictureServlet */@WebServlet("/PictureServlet")public class PictureServlet extends HttpServlet {  private static final long serialVersionUID = 1L;                                                      /**   * @see HttpServlet#HttpServlet()   */  public PictureServlet() {    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    doPost(request,response);  }  /**   * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)   */  protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {    // TODO Auto-generated method stub     response.setContentType("text/xml");//是xml      response.setHeader("Cache-Control", "no-cache");      response.setCharacterEncoding("UTF-8");      String filepath ="E:/pic/";//文件上传的路径，实际开发中一般用相对路径      String filename = "";      String name="";      ServletInputStream in = request.getInputStream();      byte[] buf = new byte[4048];      int len = in.readLine(buf, 0, buf.length);      String f = new String(buf, 0, len - 1);      while ((len = in.readLine(buf, 0, buf.length)) != -1) {        filename = new String(buf, 0, len,"utf-8");//解决汉字乱码问题        int j = filename.lastIndexOf("\"");        int s = filename.indexOf("filename");        name=filename.substring(s+10,j);        filename = name;//通过上述处理可以得到上传的文件名        System.out.println("filename="+filename);                                                                  DataOutputStream fileStream = new DataOutputStream(new BufferedOutputStream(new FileOutputStream(filepath+ filename)));        len = in.readLine(buf, 0, buf.length);        len = in.readLine(buf, 0, buf.length);        while ((len = in.readLine(buf, 0, buf.length)) != -1) {          String tempf = new String(buf, 0, len - 1);          if (tempf.equals(f) || tempf.equals(f + "--")) {            break;          }          else{             fileStream.write(buf, 0, len); // 写入          }        }        fileStream.close();      }      PrintWriter out=response.getWriter();      String result = filename ;      out.print(result);      out.close();      in.close();                         }}

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持。


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