SpringMVC —— 文件上传(传统方式、SpringMVC方式、基于mvc跨服务器)

1.传统方式

 <h3>传统文件上传</h3>
        <form action="file/testFileupload1" method="post" enctype="multipart/form-data">
            选择文件：<input type="file" name="upload"><br/>
            <input type="submit" value="上传">
        </form>

@RequestMapping("/testFileupload1")
    public String fileupload1(HttpServletRequest request) throws Exception {
        System.out.println("普通方式文件上传...");
        //使用fileupload组件完成文件上传
        //上传位置
        String path = request.getSession().getServletContext().getRealPath("/uploads/");
        //判断，该路劲是否存在
        File file = new File(path);
        if(!file.exists()){
            //创建文件夹
            file.mkdirs();
        }
        //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> items = upload.parseRequest(request);
        //遍历
        for (FileItem item : items) {
            //判断当前item对象是否是上传文件项
            if(item.isFormField()){
                //普通表单项
            }else {
                //说明上传文件项
                //获取上传文件的名称
                String filename = item.getName();
                //把文件的名称设置唯一值，uuid
                String uuid =UUID.randomUUID().toString().replace("-","");
                filename = uuid + "_" + filename;
                //完成上传文件
                item.write(new File(path,filename));
                //删除临时文件
                item.delete();
            }
        }
        return "success";
    }

2.springMVC上传

<h3>SpringMVC文件上传</h3>
         <form action="file/testFileupload2" method="post" enctype="multipart/form-data">
             选择文件：<input type="file" name="upload"><br/>
             <input type="submit" value="上传">
         </form>

    <!--配置文件上传对象-->
    <bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver">
        <property name="maxUploadSize" value="10485760"/>
    </bean>

 @RequestMapping("/testFileupload2")
    public String fileupload2(HttpServletRequest request, MultipartFile upload) throws Exception {
        System.out.println("SpringMVC文件上传...");
        //使用fileupload组件完成文件上传
        //上传位置
        String path = request.getSession().getServletContext().getRealPath("/uploads/");
        //判断，该路劲是否存在
        File file = new File(path);
        if(!file.exists()){
            //创建文件夹
            file.mkdirs();
        }
        //说明上传文件项
        //获取上传文件的名称
        String filename = upload.getOriginalFilename();
         //把文件的名称设置唯一值，uuid
        String uuid =UUID.randomUUID().toString().replace("-","");
        filename = uuid + "_" + filename;
         //完成上传文件
        upload.transferTo(new File(path,filename));
        return "success";
    }

3.跨服务器上传
这里需要配置两个服务器，具体过程省略。需要注意的是端口号要不一样。

<h3>SpringMVC跨服务器文件上传</h3>
    <form action="file/testFileupload2" method="post" enctype="multipart/form-data">
        选择文件：<input type="file" name="upload"><br/>
        <input type="submit" value="上传">
    </form>

 <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>

    @RequestMapping("/testFileupload3")
    public String fileupload3(MultipartFile upload) throws Exception {
        System.out.println("SpringMVC跨服务器文件上传...");
        //定义上传文件服务器路径
        String path ="http://localhost:9090/uploads/";
        //说明上传文件项
        //获取上传文件的名称
        String filename = upload.getOriginalFilename();
        //把文件的名称设置唯一值，uuid
        String uuid =UUID.randomUUID().toString().replace("-","");
        filename = uuid + "_" + filename;
        //创建客服端的对象
        Client client = Client.create();
        //和图片服务器进行连接
        WebResource webResource = client.resource(path + filename);
        //上传文件
        webResource.put(upload.getBytes());
        return "success";
    }

如果有405报错说明在新项目中target中没有uploads文件，在target新建文件就可以解决。