springMvc 系列 6-文件上传

普通文件上传

在index.jsp页面上放置上传按钮

<h3>传统文件上传</h3>
<a href="demo">demo</a>
<form action="fileUpload1" method="post" enctype="multipart/form-data">
    选择文件：<input type="file" name="upload" /><br/>
    <input type="submit" value="上传" />
</form>

导入文件上传的坐标

        <dependency>
            <groupId>commons-fileupload</groupId>
            <artifactId>commons-fileupload</artifactId>
            <version>1.3.3</version>
        </dependency>
        <dependency>
            <groupId>commons-io</groupId>
            <artifactId>commons-io</artifactId>
            <version>2.4</version>
        </dependency>

添加控制器方法来处理并生成文件，该文件放置于tomcat文件夹里

    @RequestMapping("/fileUpload1")
    public String fileUpload(HttpServletRequest request) throws Exception{
        //先获取到要上传的文件目录
        String path = request.getSession().getServletContext().getRealPath("/uploads");
        //创建File对象
        File file = new File(path);
        if(!file.exists()){
            file.mkdirs();
        }
        //创建磁盘文件项工厂
        DiskFileItemFactory factory = new DiskFileItemFactory();
        ServletFileUpload fileUpload = new ServletFileUpload(factory);
        //解析request对象
        List<FileItem> list = fileUpload.parseRequest(request);
        //遍历
        for (FileItem fileItem : list) {
            //判断文件项是普通字段，还是上传的文件
            if(fileItem.isFormField()){
                //普通表单
            }else{
                //上传文件
                String filename = fileItem.getName();
                //把文件的名称设置唯一值，uuid
                String uuid = UUID.randomUUID().toString().replace("-","");
                filename=uuid+"_"+filename;
                fileItem.write(new File(path, filename));//上传文件
                fileItem.delete();//删除临时文件
            }
        }
        return "success";
    }

springMVC上传

springMVC框架提供了MultipartFile对象，该对象表示上传的文件，要求变量名称必须和表单file标签的name属性名称相同。

    <!--配置文件解析器对象-->
    <bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver">
        <property name="maxUploadSize" value="10485760" />
    </bean>

在index.jsp页面上放置上传按钮

<h3>Springmvc文件上传</h3>
<form action="fileUpload2" method="post" enctype="multipart/form-data">
    选择文件：<input type="file" name="upload" /><br/>
    <input type="submit" value="上传" />
</form>

添加控制器方法来处理并生成文件

    @RequestMapping("/fileUpload2")
    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
        String path = request.getSession().getServletContext().getRealPath("/uploads");
        File file = new File(path);
        if(!file.exists()){
            file.mkdirs();
        }
        //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;
        //完成文件上传
        upload.transferTo(new File(path,filename));
        return "success";
    }

跨服务器文件上传

在index.jsp页面上放置上传按钮

<h3>跨服务器文件上传</h3>
<form action="fileUpload3" method="post" enctype="multipart/form-data">
    选择文件：<input type="file" name="upload" /><br/>
    <input type="submit" value="上传" />
</form>

使用springMVC上传时需要添加坐标

         <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>

添加控制器方法来处理并生成文件

    @RequestMapping("fileUpload3")
    public String fileUpload3(MultipartFile upload) throws Exception{
        //定义上传文件服务器路径
        String path = "http://localhost:9090/uploads";
        String filename = upload.getOriginalFilename();
        String uuid = UUID.randomUUID().toString().replace("-","");
        filename = uuid + "_" + filename;
        //创建客户端的对象
        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";
    }