1.文件上传
1.1预备工作，需要两个jar包（Fileupload）
jar包下载路径：
[点击下载https://github.com/suyirulan/putao/tree/master/fileupload_jar]
1.2上传文件的jsp页面如下，注意上传文件时表单form标签的属性method="post" enctype="multipart/form-data"是必须的，并且文件的name=" "也是必须的
1 <%@ page language="java" contentType="text/html; charset=UTF-8" 2 pageEncoding="UTF-8"%> 3 <!DOCTYPE html> 4 <html> 5 <head> 6 <meta charset="UTF-8"> 7 <title>上传文件</title> 8 </head> 9 <body> 10 <form action="addStudent" method="post" enctype="multipart/form-data"> 11 姓名：<input type="text" name="name"/><br> 12 年龄：<input type="text" name="age"/><br> 13 头像：<input type="file" name="headphoto"/><br> 14 <input type="submit" value="上传"/> 15 </form> 16 </body> 17 </html>
1.3在springmvc配置文件中上传解析器
其中value="99999999"为限制上传文件的最大字节（字节计算：1M=1024k=1024*1024=1048576字节）
1 <!-- 文件上传解析器 --> 2 <bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver"> 3 <property name="maxUploadSize" value="99999999"></property> 4 </bean>
1.4上传文件的Controller代码
1 @Controller 2 public class StudentController { 3 4 @RequestMapping("addStudent") 5 public String addStudent(Student stu,HttpServletRequest request,MultipartFile headphoto,Model model) { 6 //1.获取上传文件真实保存路径 7 String path = request.getServletContext().getRealPath("/headphoto"); 8 //2.创建一个文件对象 9 File file=new File(path); 10 //若没有此文件则创建 11 if(!file.exists()) { 12 file.mkdirs(); 13 } 14 //3.获取文件名 15 String filename=System.currentTimeMillis()+headphoto.getOriginalFilename(); 16 17 stu.setPhoto("headphoto/"+filename); 18 19 File targetFile =new File(path+"/"+filename); 20 21 try { 22 FileUtils.writeByteArrayToFile(targetFile, headphoto.getBytes()); 23 } catch (IOException e) { 24 // TODO Auto-generated catch block 25 e.printStackTrace(); 26 } 27 28 model.addAttribute("stu",stu); 29 30 return "index"; 31 } 32 }
进行测试
上传成功
2.拦截器（拦截的都是控制层地址，filter：页面地址请求都可以拦截）
2.1创建一个类，实现接口Handlerinterceptor
2.2重写接口中的方法
1 public class MyInterceptor implements HandlerInterceptor{ 2 3 @Override 4 public void afterCompletion(HttpServletRequest arg0, HttpServletResponse arg1, Object arg2, Exception arg3) 5 throws Exception { 6 // TODO Auto-generated method stub 7 8 } 9 10 @Override 11 public void postHandle(HttpServletRequest arg0, HttpServletResponse arg1, Object arg2, ModelAndView arg3) 12 throws Exception { 13 // TODO Auto-generated method stub 14 15 } 16 17 @Override 18 public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object arg2) throws Exception { 19 Object name = request.getSession().getAttribute("name"); 20 if(name!=null) { 21 return true; 22 }else { 23 System.out.println("拦截器"); 24 return false; 25 } 26 } 27 28 }
2.3把创建的类配置到SpringMVC文件中,其中<mvc:mapping path=" "/>为拦截的，<mvc:exclude-mapping path=" "/>为放行的
1 <!-- 拦截器 --> 2 <mvc:interceptors> 3 <mvc:interceptor> 4 <mvc:mapping path="/user/**"/> 5 <mvc:exclude-mapping path="/user/login1"/> 6 <mvc:exclude-mapping path="/user/denglu"/> 7 <bean class="com.zhiyou100.zhl.interceptor.MyInterceptor"></bean> 8 </mvc:interceptor> 9 </mvc:interceptors>
Fileupload