ssm框架下上传图片及其他信息

先引入这两个包：

                <dependency>
	        <groupId>commons-fileupload</groupId>
			<artifactId>commons-fileupload</artifactId>
			<version>1.3.1</version>
		</dependency>
		<dependency>
			<groupId>commons-io</groupId>
			<artifactId>commons-io</artifactId>
			<version>1.3.1</version>
		</dependency>

html:

注意：enctype="multipart/form-data"  这个要这样定义

<form id="form-register" action="${pageContext.request.contextPath}/user/upLoadPicture.do" method="post"  enctype="multipart/form-data" onsubmit="return check()" class="form-horizontal m-t">
<div class="form-group">
        <label class="col-sm-5 control-label">上传头像：</label>
        <input type="file" name="file" id="file" style="height:30px;background-color:#ff9900;outline:none;border:none;width:10%;" onchange="uploadPic()"> 

</div>
<div class="form-group">
  <label class="col-sm-5 control-label">头像显示：</label>
   <div class="col-sm-4" >
      <img border="0" width="40" height="50" src="${user.picture}">
   </div>
</div>
  <input type="hidden" name="id" id="id" readonly="readonly" value="${user.id}" />
  <div class="form-group">
        <label class="col-sm-5 control-label"><span style="color: red;">*</span>用户名：</label>
        <div class="col-sm-4" >
            <input type="text" id="name" name="name"  class="form-control" placeholder="请输入用户名" onblur="checkName()"  maxlength="16"  value="${user.name}">
            <div id="user_prompt">用户名由4到16位（字母，数字，下划线，减号）</div>
        </div>
   </div>
  <div class="form-group">
        <label class="col-sm-5 control-label">真实姓名：</label>
        <div class="col-sm-4">
            <input type="text" id="realName" name="realName" class="form-control" placeholder="请输入真实姓名"  value="${user.realName}">
        </div>
    </div> 

        	<div class="form-group">
            	<label class="col-sm-5 control-label">性别</label>
                <div class="col-sm-4">
                <c:if test="${user.gender=='男'}">
                   <div class="radio-box"  style="float:left">
					<input name="gender" type="radio" id="male" value="男" checked>
					<label for="sex-1">男</label>
				</div>
				<div class="radio-box"  style="float:left">
					<input name="gender" type="radio" id="female" value="女">
					<label for="sex-2">女</label>
				</div>
                </c:if>
                <c:if test="${user.gender=='女'}">
                   <div class="radio-box"  style="float:left">
					<input name="gender" type="radio" id="male" value="男">
					<label for="sex-1">男</label>
				</div>
				<div class="radio-box"  style="float:left">
					<input name="gender" type="radio" id="female" value="女" checked>
					<label for="sex-2">女</label>
				</div>
                </c:if>
                </div>
            </div>
            <div class="form-group">
            	<label class="col-sm-5 control-label">民族</label>
                <div class="col-sm-4">
                  <select name="ethGro" class="form-control input-sm">
                         <option selected="selected" value="${user.ethGro}">${user.ethGro}</option>
                  </select>
                </div>
            </div>

<br>

    <div class="form-group" align=center>
      <div class="col-sm-8 col-sm-offset-2">
        <button class="btn btn-primary" type="submit">保存</button>
        </div>
    </div>
</form

后台：

@RequestMapping(value="upLoadPicture.do",method = RequestMethod.POST)
public String  upload(User user,HttpServletRequest request,ModelMap map) throws Exception{
	  System.out.println(request.getParameter("name"));
      //保存数据库的路径
      String sqlPath = null;
      //定义文件保存的本地路径
      String localPath="D:\\File\\";
      //创建文件
  	  File dir=new File(localPath);
      if(!dir.exists()){
  		dir.mkdirs();
  	  }
      //定义 文件名
      String filename=request.getParameter("name").toString();
      if(!user.getFile().isEmpty()){
          //生成uuid作为文件名称
          String uuid = UUID.randomUUID().toString().replaceAll("-","");
          //获得文件类型（可以判断如果不是图片，禁止上传）
          String contentType=user.getFile().getContentType();
          //获得文件后缀名
          String suffixName=contentType.substring(contentType.indexOf("/")+1);
          //得到 文件名
          filename=uuid+"."+suffixName;
          System.out.println(filename);
          //文件保存路径
          user.getFile().transferTo(new File(localPath+filename));
          sqlPath = "/images/"+filename;
          System.out.println(sqlPath);
          user.setPicture(sqlPath);
          userService.updateUser(user);
      }
      //把图片的相对路径保存至数据库
      userService.updateUserNoPicture(user);
      Page page=new Page();
      page.setCurrentPage(1);
      List<User> users = userService.getAllUser(page);
      page.setRows( userService.count());
  	  map.addAttribute("page",page);
  	  map.addAttribute("users",users);
  	  return "user_list";
}