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基于jsp的AJAX多文件上传的实例

2020-11-07  来源:互联网  我有话说  收藏本文  阅读  次

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="<%=basePath%>">
<title>Insert title here</title>
<script type="text/javascript" src="js/jquery.js"></script>
<script type="text/javascript" src="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();                       
  }
}

本篇结束,感谢阅读。如有疑问请在评论区留言,或浏览新网巢教程频道其它相关文章。

(责编:如斯)

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