點(diǎn)擊上傳時(shí)，調(diào)用對(duì)應(yīng)的fileupload函數(shù)，通過(guò)ajax將文件異步傳送到servlet中處理。注意在文件上載時(shí)，所使用的編碼類型應(yīng)當(dāng)是“multipart/form-data”，它既可以發(fā)送文本數(shù)據(jù)，也支持二進(jìn)制數(shù)據(jù)上載。

<%@ 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("上傳文件不能為空!");
      return false;
    }
    var file = $("#locationphoto").val();
    var pos=file.lastIndexOf("\\");
var fileName=file.substring(pos+1);//獲得文件名字
                                                                                                                               
    $.ajaxFileUpload({
                                                                                                                                   
        url:"PictureServlet";,
        contentType:"multipart/form-data; text/xml;charset=utf-8",
        secureuri:false,
        cache: false,//防止緩存
        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("上傳文件不能為空!");
      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,//防止緩存
        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("上傳文件不能為空!");
      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,//防止緩存
        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">樓盤位置圖：
    <span id="locationspan" ></span>
   <input type="file" name="locationphoto" id="locationphoto" value="this.val()"/>
   <input type="button" name="fileLoad1" id="fileLoad1" value="上傳" onClick="fileupload1()"/>
   </td>
  </tr>
   <tr>
   <td height="30" colspan="2">樓盤照片：
   <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="上傳" onClick="fileupload2()"/>
   </td>
  </tr>
    <tr>
   <td height="30" colspan="2">樓盤戶型圖：
    <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="上傳" onClick="fileupload3()"/>
   </td>
  </tr>
 </table>
</form>
</body>
</html>

2.PictureServlet.java

通過(guò)該servlet接受jsp上傳的數(shù)據(jù)流，存儲(chǔ)到相應(yīng)路徑，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/";//文件上傳的路徑，實(shí)際開(kāi)發(fā)中一般用相對(duì)路徑
      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");//解決漢字亂碼問(wèn)題
        int j = filename.lastIndexOf("\"");
        int s = filename.indexOf("filename");
        name=filename.substring(s+10,j);
        filename = name;//通過(guò)上述處理可以得到上傳的文件名
        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); // 寫入
          }
        }
        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?jī)?nèi)容，希望對(duì)大家的學(xué)習(xí)有所幫助，也希望大家多多支持腳本之家。

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