对比着学

Struts的文件上传
 上传界面一个
  from是多功能表单enctype="mytipart/form-data" method="post"
  UpoladFileAction
    File file
    String fileFileName
    String fileContentType
   完成图片的虚拟映射
   为了开发便捷，需要引入common-fileUpload
   FileUtil.copy(source,target)

springmvc文件上传
 上传界面一个
  from是多功能表单enctype="mytipart/form-data" method="post"
 @requestMapping("/upload")
  MutipartFile file(包括了之前的三个对象)
 完成图片的虚拟映射
 为了开发便捷，需要引入common-fileUpload
 FileUtil.copyinoutStreamtoFile(inputStream,target)

文件上传

导入pom依赖

 <!--文件上传-->
    <commons-fileupload.version>1.3.3</commons-fileupload.version>
    
<!--文件上传-->
    <dependency>
      <groupId>commons-fileupload</groupId>
      <artifactId>commons-fileupload</artifactId>
      <version>${commons-fileupload.version}</version>
    </dependency>

BookController.java

  @RequestMapping("/upload")
    public String edit(MultipartFile file){
        System.out.println(file.getOriginalFilename());
        System.out.println(file.getContentType());
        try {
            FileUtils.copyInputStreamToFile(file.getInputStream(),new File("E:/temp/"+file.getOriginalFilename()));
        } catch (IOException e) {
            e.printStackTrace();
        }
        return "redirect:/book/list";
    }

upload.jsp

<%--
  Created by IntelliJ IDEA.
  User: 86135
  Date: 2019/11/24
  Time: 18:19
  To change this template use File | Settings | File Templates.
--%>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
    <title>springmvc文件上传</title>
</head>
<body>

<form action="${pageContext.request.contextPath}/book/upload" method="post" enctype="multipart/form-data">
    待上传文件：<input type="file" name="file"><input type="submit">

</form>

</body>
</html>

springmvc-servlet.xml

 <bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver">
        <!-- 必须和用户JSP 的pageEncoding属性一致，以便正确解析表单的内容 -->
        <property name="defaultEncoding" value="UTF-8"></property>
        <!-- 文件最大大小(字节) 1024*1024*50=50M-->
        <property name="maxUploadSize" value="52428800"></property>
        <!--resolveLazily属性启用是为了推迟文件解析，以便捕获文件大小异常-->
        <property name="resolveLazily" value="true"/>
    </bean>

实现映射

在这里插入图片描述

效果图

在这里插入图片描述

json支持

HelloController.java

    @Autowired
    private BookService bookService;


  @ResponseBody  //将结果进行json转换
    @RequestMapping("/json1")
    public Map json1(HttpServletRequest req){
        PageBean pageBean=new PageBean();
        pageBean.setRequest(req);
        List<Map> list = bookService.listPager(new Book(), pageBean);
        Map map=new HashMap();
        map.put("total",101);
        map.put("data",list);
        return map;
    }
    @ResponseBody  //将结果进行json转换
    @RequestMapping("/json2")
    public List<Map> json2(HttpServletRequest req){
        PageBean pageBean=new PageBean();
        pageBean.setRequest(req);
        List<Map> list = bookService.listPager(new Book(), pageBean);
        return list;
    }


    @ResponseBody  //将结果进行json转换
    @RequestMapping("/json3")
    public String json3(HttpServletRequest req){
        return "springmvc String to json";
    }