文件上传与拦截器

来源：互联网发布：pm2.5数据接口编辑：程序博客网时间：2024/06/13 20:17

单文件上传：

@Controllerpublic class FileController {    @RequestMapping("/first")    public  String doFirst(MultipartFile  upload, HttpSession session){

   System.out.println("*******************");        if (upload.getSize() > 0) {            //用户是否选择了文件            //获取到用户上的文件名称            String chilpath = upload.getOriginalFilename();  //文件短路径            //将相对路径转换成绝对路径            String parePath = session.getServletContext().getRealPath("/uplode");            //将file写入指定的路径            File filePath = new File(parePath, chilpath);            try {                upload.transferTo(filePath);                return "/Fileuplode.jsp";            } catch (IOException e) {                e.printStackTrace();                return "/list.jsp";            }        }else {            return  "/list.jsp";        }    }}

Fileupdlo.xml配置：

    <!--配置包扫描器--><context:component-scan base-package="cn.Fileuplode"></context:component-scan>         <!--配置文件上传的专用类--><bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver">    <property name="defaultEncoding" value="utf-8"></property>    <property name="maxUploadSize" value="5000000"></property></bean><mvc:annotation-driven/>

多文件上传：

@Controllerpublic class MostFileController {                      //多文件上传    @RequestMapping("/first")    public String doFlrat(@RequestParam MultipartFile[] upload, HttpSession session) {        System.out.println("*******************");        for (MultipartFile item:upload) {            if(item.getSize()>0){                //用户是否选择了文件                //获取到用户上传的文件名称                String chilPath=item.getOriginalFilename(); //文件段名称                if(chilPath.endsWith(".jpg")||chilPath.endsWith("gif")||chilPath.endsWith("png")){                    //将行对路径转换成绝对路径                    String paraPath=session.getServletContext().getRealPath("/uplode");                    //将file写入指定的路径                    File  filePath=new File(paraPath,chilPath);                    try {                        //将文件内存运输到指定的文件中                        item.transferTo(filePath);                    } catch (IOException e) {                        e.printStackTrace();                        return "/Fileuplode.jsp";                    }                }else {                    return "/Fileuplode.jsp";                }            }else {                return "/Fileuplode.jsp";            }        }        return "/index.jsp";    }

@RequestMapping("/first2")public String doFirst2(MultipartFile upload,HttpSession session){    System.out.println("****************************88");    if(upload.getSize()>0){        //用户是否选择了文件        //获取到用户上传的文件名称        String chilPath=upload.getOriginalFilename();  //文件短名称        if(chilPath.endsWith(".jpg")||chilPath.endsWith("gif")||chilPath.endsWith("png")){            //将相对路径转化成绝对路径            String paratPath=session.getServletContext().getRealPath("/uplode");            //将file写入指定的路径            File filePath=new File(paratPath,chilPath);            try {                //将文件内存运输到指定的文件中                upload.transferTo(filePath);            } catch (IOException e) {                e.printStackTrace();                return "/index.jsp";            }        }else {            return "/Fileuplode.jsp";        }    }else {        return "/Fileuplode.jsp";    }    return "/Fileuplode.jsp"; }
}

MostFileupdlo.xml配置：

     <!--配置包扫描器--><context:component-scan base-package="cn.mostFileupload"></context:component-scan>         <!--配置文件上传的专用类--><bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver">    <property name="defaultEncoding" value="utf-8"></property>    <property name="maxUploadSize" value="5000000"></property></bean><mvc:annotation-driven/>
Fileuplode.jsp页面：   
</head><body><h1>文件上传</h1><form action="/first" method="post" enctype="multipart/form-data">    文件1   <input type="file" name="upload"/>    文件2   <input type="file" name="upload"/>    文件3   <input type="file" name="upload"/>    <input type="submit"/></form></body>
Struts2拦截器：  exception 异常拦截器     
                params 参数拦截器
                il8n 国际化拦截器
                fileupload 文件上传拦截器
                validation 校验拦截器
Struts2中处理的请求的组件是：Action
SpringMVC中处理请求的组件是：Controller
JSP中处理请求的组件是： servlet
拦截器HandlerInterceptor的三种方法：（1）perHandle() (2)postHandle() (3)afterCompletion()
注册拦截器：   **匹配0或者更多的目录
                *匹配0或者任意的字符串
  拦截器：
   创建Myhanderinter类并集成HandlerInterceptor接口中的方法： public class Myhanderinter implements HandlerInterceptor {    @Override    public boolean preHandle(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, Object o) throws Exception {        System.out.println("perHandle+=========================================");        return true;    }    @Override    public void postHandle(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, Object o, ModelAndView modelAndView) throws Exception {        System.out.println("posthandle-------------------------------------");    }    @Override    public void afterCompletion(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, Object o, Exception e) throws Exception {        System.out.println("afterHandle====================================");    }}
//在创建一个intercfeption类
@Controllerpublic class intercfeption {  @RequestMapping("/first")    public String doInter(){      System.out.println("Handle=====================================");        return "index.jsp";    }}
  HandleInter.xml配置：
   <!--配置包扫描器--><context:component-scan base-package="cn.Handerinter"></context:component-scan>         <!--注册拦截器--><mvc:interceptors>    <mvc:interceptor>        <mvc:mapping path="/**"/>        <bean class="cn.Handerinter.Myhanderinter"></bean>    </mvc:interceptor></mvc:interceptors><mvc:annotation-driven/>

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