Spring学习笔记（九）——SpringMVC实现文件上传

<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>2.4</version>
</dependency>

<h4>文件上传</h4>
<form action="user/fileupload" method="post" enctype="multipart/form-data">
选择文件：<input type="file" name="upload"/><br/>
<input type="submit" value="上传文件"/>
</form>

/**
     * 传统方式上传文件
     * @param request
     * @return
     * @throws Exception
     */
    @RequestMapping("/fileupload1")
    public String fileupload1(HttpServletRequest request) throws Exception {
        System.out.println("fileupload1执行了");

        //使用fileupload组件完成上传
        //上传位置
        String path = request.getSession().getServletContext().getRealPath("/uploads");
        System.out.println(path);
        //判断路径是否存在
        File file = new File(path);
        if (!file.exists()) {
            //创建该文件夹
            file.mkdir();
        }
        //解析request对象，获取上传文件项
        DiskFileItemFactory factory = new DiskFileItemFactory();
        ServletFileUpload upload = new ServletFileUpload(factory);
        //解析request
        List<FileItem> fileItems = upload.parseRequest(request);
        //遍历
        for (FileItem fileItem : fileItems) {
            //进行判断，fileItem是否为上传文件项
            if (fileItem.isFormField()) {
                //说明普通表单项
            } else {
                //说明是上传文件项
                //获取到上传文件的名称
                String fieldName = fileItem.getName();
                //把文件名称设置成唯一值
                String uuid = UUID.randomUUID().toString().replace("-", "").toUpperCase();
                System.out.println(fieldName);
                fieldName = uuid + "_" + fieldName;
                //完成上传文件
                fileItem.write(new File(file, fieldName));
                //删除临时文件
                fileItem.delete();
            }
        }

        return "success";
    }

 /**
     * SpringMVC方式上传文件
     *
     * @param request
     * @return
     * @throws Exception
     */
    @RequestMapping("/fileupload2")
    public String fileupload2(HttpServletRequest request, MultipartFile upload) throws Exception {
        System.out.println("fileupload2执行了");
        //使用fileupload组件完成上传
        //上传位置
        String path = request.getSession().getServletContext().getRealPath("/uploads");
        System.out.println(path);
        //判断路径是否存在
        File file = new File(path);
        if (!file.exists()) {
            //创建该文件夹
            file.mkdir();
        }
        //说明是上传文件项
        //获取到上传文件的名称
        String filename = upload.getOriginalFilename();
        //把文件名称设置成唯一值
        String uuid = UUID.randomUUID().toString().replace("-", "").toUpperCase();
        System.out.println(filename);
        filename = uuid + "_" + filename;
        //完成上传文件
        upload.transferTo(new File(path, filename));

        return "success";
    }

<!-- 配置文件解析器对象，要求id名称必须是multipartResolver -->
    <bean id="multipartResolver"
          class="org.springframework.web.multipart.commons.CommonsMultipartResolver">
        <!-- 10M -->
        <property name="maxUploadSize" value="10485760"/>
    </bean>

 <dependency>
            <groupId>com.sun.jersey</groupId>
            <artifactId>jersey-core</artifactId>
            <version>1.18.1</version>
        </dependency>
        <dependency>
            <groupId>com.sun.jersey</groupId>
            <artifactId>jersey-client</artifactId>
            <version>1.18.1</version>
        </dependency>

2.  编写文件上传的JSP页面

<h4>SpringMVC跨服务器的方式文件上传</h4>

<form action="file/fileupload3" method="post" enctype="multipart/form-data">
    选择文件：<input type="file" name="upload"><br>
    <input type="submit" value="上传">
</form>

3. 编写控制器

    /**
     * SpringMVC跨服务器方式上传文件
     *
     * @param
     * @return
     * @throws Exception
     */
    @RequestMapping("/fileupload3")
    public String fileupload3(MultipartFile upload) throws Exception {
        System.out.println("fileupload3执行了");
        //上传位置
        String path = "http://localhost:9090/uploads/";
        //说明是上传文件项
        //获取到上传文件的名称
        String filename = upload.getOriginalFilename();
        //把文件名称设置成唯一值
        String uuid = UUID.randomUUID().toString().replace("-", "").toUpperCase();
        System.out.println(filename);
        filename = uuid + "_" + filename;
        //完成上传文件，跨服务器上传
        //1. 创建客户端对象
        Client client = Client.create();
        //2. 和图片服务器进行连接
        WebResource resource = client.resource(path + filename);
        //3. 上传文件
        resource.put(upload.getBytes());

        return "success";
    }