<span style="white-space:pre"> </span> /**
* 获取多个文件，，注意问题：<br>
* 1.表单无需属性enctype="multipart/form-data"<br>
* 2.前台使用XMLHttpRequest对象或ajax发送数据<br>
* 3.前台使用FormData对象获取多个文件
* @param request
* @return
* @throws Exception
*/
@RequestMapping("/multi/save.do")
public String save(HttpServletRequest request) throws Exception{
//转为MultipartHttpServletRequest
MultipartHttpServletRequest multipartRequest = (MultipartHttpServletRequest) request;
//获取所有的文件
Map map = multipartRequest.getFileMap();
MultipartFile multipartFile = null;
for (Iterator i = map.keySet().iterator(); i.hasNext();) {
DemoMultiPhoto photo = new DemoMultiPhoto();
Object obj = i.next();
multipartFile = (MultipartFile) map.get(obj);
//获取文件名称
String fileName = multipartFile.getOriginalFilename();
//获取文件内容，二进制传送过来的
byte[] content = multipartFile.getBytes();
photo.setName(fileName);
photo.setPhotoParentId(content);
multiFileService.doSave(photo);
}
return "multiFile";
}
/**
* 只能获取单个文件(其他文件被覆盖)，注意问题：<br>
* 1.表单属性enctype="multipart/form-data"，二进制流传送数据<br>
* 2.表单文件控件必须有name属性<br>
* 3.后台接受文件控件时，类型不是String，而是{@link MultipartFile}，否则接受数据为null<br>
* 4.HttpServletRequest转为MultipartHttpServletRequest，否则接受数据为null<br>
* 5.只能获取一个文件，其他文件被覆盖(key不能重复)
* @param request
* @param name
* @param ph 对象必须为{@link MultipartFile}
* @return
* @throws Exception
*/
@RequestMapping("/multi/save2.do")
public String save2(HttpServletRequest request, String name, MultipartFile ph) throws Exception{
//转为MultipartHttpServletRequest
MultipartHttpServletRequest multipartRequest = (MultipartHttpServletRequest) request;
//遍历上传的多文件，其map的Key值是file控件的name属性，所以只能保存单个文件(key不重复，被覆盖)
Map map = multipartRequest.getFileMap();
MultipartFile multipartFile = null;
for (Iterator i = map.keySet().iterator(); i.hasNext();) {
DemoMultiPhoto photo = new DemoMultiPhoto();
Object obj = i.next();
multipartFile = (MultipartFile) map.get(obj);
//获取文件名称
String fileName = multipartFile.getOriginalFilename();
//获取文件内容，二进制传送过来的
byte[] content = multipartFile.getBytes();
photo.setName(fileName);
photo.setPhotoParentId(content);
multiFileService.doSave(photo);
}
return "multiFile";
} 对应JSP：
<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="utf-8"%>
<!DOCTYPE html>
<html>
<head>
<jsp:include page="inc.jsp" flush="true"></jsp:include>
<title>MultiFile 多图片上传</title>
<meta charset="utf-8">
<script type="text/javascript">
function upload(){
var xhr = new XMLHttpRequest();
var form = new FormData();
var files = document.getElementById("file2").files;
var name = $("#name2").val();
form.append("name",name);
for(var i=0; i< files.length; i++){
form.append(files[i].name,files[i]);
}
xhr.open("POST","<%=request.getContextPath()%>/multi/save.do");
xhr.send(form);
}
</script>
</head>
<body>
<form id="form1" action="javascript:upload();" method="post">
<label>用户：</label>
<input type="text" id="name1" style="border:2px solid red;" name="name"/><br>
<label>图片：</label>
<input type="file" id="file1" multiple="multiple" style="border:2px solid red;" name="ph"/>
<p class="help-block">支持jpg、jpeg、png、gif格式，大小不超过5.0M</p>
<button type="submit" style="border: 2px solid red;">上传1</button>
</form>
<form id="form2" action="<%=request.getContextPath()%>/multi/save2.do" method="post" enctype="multipart/form-data">
<label>用户：</label>
<input type="text" id="name2" style="border:2px solid red;" name="name"/><br>
<label>图片：</label>
<input type="file" id="file2" multiple="multiple" style="border:2px solid red;" name="ph"/>
<p class="help-block">支持jpg、jpeg、png、gif格式，大小不超过5.0M</p>
<button type="submit" style="border: 2px solid red;">上传2</button>
</form>
</body>
</html>
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