(jsp需要引入 ：jquery-1.9.0.js、jquery.form.js ) ，jsp頁面使用的是bootstrap制作的，看不懂的標簽不用管，form表單大同小異。代碼比較簡陋，只是為了演示使用ajaxSubmit異步上傳圖片及保存數據，請海含！
(參考文獻：http://www.jb51.net/shouce/jquery/jquery_api/Plugins/Form/ajaxSubmit.html)
一：web (add.jsp)
. 代碼如下:
<%@page import="com.fingerknow.project.vo.UserInformation"%>
<%@ page language="java" contentType="text/html; charset=utf-8"
pageEncoding="utf-8"%>
<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %>
<c:set var="ctx" value="${pageContext.request.contextPath }" />
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>注冊商圈</title>
<link href="${ctx}/bootstrap/css/bootstrap.css" rel="stylesheet">
<link href="${ctx}/bootstrap/css/bootstrap-responsive.css" rel="stylesheet">
<link rel="stylesheet" href="${ctx}/css/bootstrap-responsive.min.css" />
<link rel="stylesheet" href="${ctx}/css/jquery-ui.css" />
<link rel="stylesheet" href="${ctx}/css/uniform.css" />
<link rel="stylesheet" href="${ctx}/css/select2.css" />
<link rel="stylesheet" href="${ctx}/css/unicorn.main.css" />
<link rel="stylesheet" href="${ctx}/css/common.css" />
<%
response.setCharacterEncoding("utf-8");//這個是設置編碼方式
response.setContentType("text/html");//這個是設置網頁類型，為文本代碼
UserInformation user=null;
String username="";
Integer userId=null;
if(request.getSession().getAttribute("userinfo")!=null){
user=(UserInformation)request.getSession().getAttribute("userinfo");
username=user.getUsername();
userId=user.getUserId();
}else{
username="請<a href='http://localhost:8080/fk/test/login.jsp'>登錄</a>";
}
%>
</head>
<body>
<div class="header-inner">
<div class="container">
<div class="row">
<div class=" page-header clearfix">
<div class="span11"> <h1 class="page-header" style="background:black;"><img alt="fingerknow" src="${ctx}/images/fingerknow.png" width=""><small>中文最大的購物經驗分享平台</small></h1> </div>
<div class="span1"> <a href="#">首頁</a> |<a href="#">幫助</a></div>
</div>
</div>
</div>
</div>
<div class="container" id="businessEname_div">
<div class="row">
<div class="span1"></div>
<div class="span10">
<div class="widget-box">
<div class="widget-title">
<span class="icon">
<i class="icon-align-justify"></i>
</span>
<h5>注冊商圈</h5>
</div>
<div class="widget-content nopadding">
<form class="form-horizontal" method="post" action="${ctx}/upload/upload.do" id="uploadImgForm" enctype="multipart/form-data">
<div class="control-group" style="border: 0px solid red;">
<label class="control-label">*商圈名：</label>
<div class="controls" style="width: 350px;border: 0px solid red;vertical-align: middle;" >
<input type="text" name="businessName" maxlength="20" id="businessName" width="200px;"/>
<input type="text" name="userId" maxlength="20" value="<%=userId%>" id="userId" width="200px;"/>
<div id="businessName_error" ></div>
</div>
</div>
<div class="control-group">
<label class="control-label">*商圈logo：</label>
<div class="controls" style="width:350px;">
<input type="file" name="file" id="file">
<div id="file_error"></div>
</div>
</div>
<div class="control-group">
<label class="control-label">*商圈英文名：</label>
<div class="controls" style="width: 350px;">
<input type="text" name="businessEname" id="businessEname" />
<div id="businessEname_error"></div>
</div>
</div>
<div class="form-actions">
<button type="button" id="imgSave" value="Validate" class="btn btn-primary">提交注冊</button>
</div>
</form>
</div>
</div>
</div>
<div class="span1"></div>
</div>
</div>
<div class="container" style="background:white;">
<div class="row">
<div class="span12" style="margin-left: 25%;">
<p>© 2012 fingerknow.com <span>|</span><a href="#" rel="nofollow" >隱私條款</a><span>|</span><a href="#" rel="nofollow">服務條款</a><span>|</span><a href="#" rel="nofollow" >粵ICP備12003619號-1</a></p>
</div>
</div>
</div>
<script src="${ctx}/js/jquery-1.9.0.js"></script>
<script src="${ctx}/js/jquery.form.js"></script>
<script type="text/javascript">
/**
*
* V1.0
*/
$(document).ready(function() {
//驗證商圈名
$("#businessName").blur(function(){
var businessName=$("#businessName").val();
if(businessName!=""){
$("#businessName_error").html("<img src='${ctx}/images/success_img.gif' style='width:15px;height:15px;'/>");
}else{
$("#businessName_error").attr("class","error_div").html("<img src='${ctx}/images/error_img2.gif' style='width:15px;height:15px;'/>"+"商圈名不能為空！");
}
});
//驗證商圈英文名
$("#businessEname").blur(function(){
var businessEname=$("#businessEname").val();
if(businessEname!=""){
$("#businessEname_error").html("<img src='${ctx}/images/success_img.gif' style='width:15px;height:15px;'/>");
}else{
$("#businessEname_error").attr("class","error_div").html("<img src='${ctx}/images/error_img2.gif' style='width:15px;height:15px;'/>"+"商圈英文名不能為空！");
}
});
//圖片上傳 及數據保存
$("#imgSave").click(function(){
var ext = '.jpg.jpeg.gif.bmp.png.';
var f=$("#file").val();
if (f== "") {//先判斷是否已選擇了文件
$("#file_error").attr("class","error_div").html("<img src='${ctx}/images/error_img2.gif' style='width:15px;height:15px;'/>"+"請添加商圈logo！");
return false;
}
f = f.substr(f.lastIndexOf('.') + 1).toLowerCase();
if (ext.indexOf('.' + f + '.') == -1) {
$("#file_error").attr("class","error_div").html("<img src='${ctx}/images/error_img2.gif' style='width:15px;height:15px;'/>"+"圖片格式不正確！");
return false;
}
var options = {
url: "${ctx}/upload/upload.do",
dataType: 'json',
contentType: "application/json; charset=utf-8",
success: function(data) {
// 'data' is an object representing the the evaluated json data
// 如果圖片上傳成功則保存表單注冊數據
if(data.status=="0"){
var fileName=data.fileName;
//alert(fileName);
var businessName=$("#businessName").val();
var userId=$("#userId").val();
var businessEname=$("#businessEname").val();
businessName=encodeURI(businessName);
businessName=encodeURI(businessName);
var urls="${ctx}/business/addBusiness.do?businessName="+businessName+"&businessPic="+fileName+"&businessEname="+businessEname+"&userId="+userId;
$.ajax({
type: "post",
url:urls ,
dataType: "json", /*這句可用可不用，沒有影響*/
contentType: "application/json; charset=utf-8",
success: function (data) {
if(data.status=="0"){
alert("注冊成功!");
}else{
alert("注冊失敗!原因是："+data.message);
}
},
error: function (XMLHttpRequest, textStatus, errorThrown) {
alert(errorThrown);
}
});
}else{
$("#file_error").attr("class","error_div").html("<img src='${ctx}/images/error_img2.gif' style='width:15px;height:15px;'/>"+data.message);
}
}
};
// 提交表單
$('#uploadImgForm').ajaxSubmit(options);
});
});
</script>
</body>
</html>
二：service(FileUploadController.java ----springMVC 之controller層)
. 代碼如下:
@Controller
@RequestMapping(value = "/upload")
public class FileUploadController {
private Logger logger;
@RequestMapping(value = "upload.do", method = RequestMethod.POST)
public void fileUpload(HttpServletRequest request, HttpServletResponse response) {
Map<String, Object> resultMap = new HashMap<String, Object>();
String newRealFileName = null;
try {
MultipartHttpServletRequest multipartRequest = (MultipartHttpServletRequest) request;
CommonsMultipartFile file = (CommonsMultipartFile) multipartRequest.getFile("file");
// 獲得文件名：
String realFileName = file.getOriginalFilename();
if(file.getSize()/1024>=5*1024){
resultMap.put("status", 1);
resultMap.put("message", "圖片不能大於5M");
}else{
System.out.println("獲得文件名：" + realFileName);
newRealFileName = FileUploadController.getNowTime() + realFileName.substring(realFileName.indexOf("."));
// 獲取路徑
String ctxPath = request.getSession().getServletContext().getRealPath("//") + "//temp//";
// 創建文件
File dirPath = new File(ctxPath);
if (!dirPath.exists()) {
dirPath.mkdir();
}
File uploadFile = new File(ctxPath + newRealFileName);
FileCopyUtils.copy(file.getBytes(), uploadFile);
request.setAttribute("files", loadFiles(request));
resultMap.put("status", 0);
resultMap.put("fileName", newRealFileName);
}
} catch (Exception e) {
resultMap.put("status", 1);
resultMap.put("message", "圖片上傳出錯");
logger.info("***** 圖片上傳出錯 *****");
System.out.println(e);
} finally {
PrintWriter out = null;
try {
out = response.getWriter();
} catch (IOException e) {
e.printStackTrace();
}
//必須設置字符編碼，否則返回json會亂碼
response.setContentType("text/html;charset=UTF-8");
out.write(JSONSerializer.toJSON(resultMap).toString());
out.flush();
out.close();
}
}
}