springmvc：文件上传

一、传统方式

1. 导入文件上传的jar包

<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>

2. 编写文件上传的jsp页面

<h3>文件上传</h3>
<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>

3. 编写文件上传的Controller控制器（文件上传传统方式）

@Controller
@RequestMapping("/user")
public class UserController {

    /**
     * 文件上传
     * @return
     */
    @RequestMapping("/fileupload1")
    public String fileupload1(HttpServletRequest request) throws Exception {
        System.out.println("文件上传");
        //使用fileupload组件完成文件上传
        //上传的位置
        String path = request.getSession().getServletContext().getRealPath("/uploads/");
        //判断该路径是否存在
        File file = new File(path);
        if (!file.exists()){
            //创建该文件夹
            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){
            //进行判断，当前item对象是否是上传文件项
            if (item.isFormField()){
                //说明是一个普通表单向
            }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;
                //完成文件上传
                item.write(new File(path,filename));
                //删除临时文件
                item.delete();
            }
        }

        return "success";
    }
}

---

二、springmvc方式

1、在springmvc.xml中配置文件解析器

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

2、springmvc上传文件

    /**
     * springmvc方式上传
     * @param request
     * @return
     * @throws Exception
     */
    @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
        //上传的位置
        String path = request.getSession().getServletContext().getRealPath("/uploads/");
        //判断该路径是否存在
        File file = new File(path);
        if (!file.exists()){
            //创建该文件夹
            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;
        //完成文件上传
        upload.transferTo(new File(path,filename));

        return "success";
    }

---

三、springmvc跨服务器上传文件

1、搭建图片服务器

2、导入需要的jar包

<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>

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