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技术 2022年11月18日
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文件上传部分:

1, 导入commons-fileupload-1.2.2.jar commons-io-2.4.jar 两个jar包.

2, 在主配置文件中,添加如下信息

    <!-- 文件上传-->    <bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver">        <!-- 配置上传的最大字节数 -->        <property name="maxUploadSize" value="10000000"/>        <property name="defaultEncoding" value="UTF-8"/>        <property name="maxInMemorySize" value="102400"/>        <!-- 貌似上传到的路径无法配置-->    </bean>

3, 在上传文件的表单中一定要设置 enctype=”multipart/form-data”

<%@ page language="java" contentType="text/html; charset=utf-8" pageEncoding="utf-8"%><%@ taglib prefix="sf" uri="http://www.springframework.org/tags/form" %><!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>上传文件演示</title></head><body> <sf:form method="post" action="upload" enctype="multipart/form-data">     <input type="file" name="attach" />     <!--  多个文件上传时,这样使用即可         <input type="file" name="attachs" />         <input type="file" name="attachs" />         <input type="file" name="attachs" />      -->     <input type="submit" value="提交" /> </sf:form></body></html>

  后台中的action的处理

  /**     * 如果上传多个文件,使用 @RequestParam MultipartFile[] attachs,然后遍历,一个个上传即可     * 单个文件使用 MultipartFile attach,不需要那个注解     */    public String upload( MultipartFile attach,HttpServletRequest request) throws IOException{        //getName()得到的是属性名        //getOriginalFilename() 得到的是上传过来的文件名        System.out.println(attach.getName()+","+attach.getOriginalFilename()+","+attach.getContentType());        String realPath=request.getSession().getServletContext().getRealPath("/resources/upload");        //默认上传到了--> D:\workspace-esb\.metadata\.plugins\org.eclipse.wst.server.core\tmp0\wtpwebapps\springmvc\resources\upload        File file = new File(realPath+"/"+attach.getOriginalFilename());        FileUtils.copyInputStreamToFile(attach.getInputStream(), file);        return "redirect:/user/users";  //这个返回的视图是随便写的.    }    

 返回json数据部分:

  

/**     * @PathVariable:路径中的变量     *     */    @RequestMapping(value="/{name}",method=RequestMethod.GET)    public String show(@PathVariable String name,Model model){        model.addAttribute(users.get(name));        return "/user/show";    }    /**     * 返回Json类型数据:     * 1, 导入jackson-all-1.9.11.jar     * 2, 直接返回对象即可     * 3, 使用注解@ResponseBody     * 3,为了区别上面的show()方法的requestMapping,加入params属性     */    @RequestMapping(value="/{name}",method=RequestMethod.GET,params="json")    @ResponseBody    public User show(@PathVariable String name){        return users.get(name);    }    

  第一个show()方法是普通的返回jsp页面的视图,第二个show()方法就是返回json格式的数据

<img 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" 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