第六讲 Spring MVC实现文件上传

一、通过commons-fileupload来实现。导入jar包

           <dependency>

                <groupId>commons-fileupload</groupId>

                <artifactId>commons-fileupload</artifactId>

                <version>1.3.1</version>

           </dependency>

二、配置Spring MVC的配置文件

     <!-- 文件上传配置 -->

     <bean id="multipartResolver"

          class="org.springframework.web.multipart.commons.CommonsMultipartResolver">

        <!-- 设置编码格式 -->

        <property name="defaultEncoding" value="utf-8"></property>

        <!-- 设置文件大小 -->

        <property name="maxUploadSize" value="10485760000"></property>

        <!-- 设置缓冲区大小 -->

        <property name="maxInMemorySize" value="40960"></property>

     </bean>

三、JSP页面

     <form action="upload.do"method="post" enctype="multipart/form-data">

           file:<input name="file" type="file" />

           <input type="submit" value="上传" />

     </form>

四、Controller代码

     @RequestMapping(value = "/upload")

     public String fileupload(@RequestParam("file") CommonsMultipartFile file, HttpServletRequest request)

                throws IOException {

           //获取文件名

           String fileName = file.getOriginalFilename();

           //获取上传文件的路径

           //String path = request.getRealPath("/fileupload");

           String path = request.getServletContext().getRealPath("/fileupload");

           InputStream is = file.getInputStream();

           OutputStream os = new FileOutputStream(new File(path, fileName));

           int len = 0;

           byte[] buffer = new byte[400];

           

           while((len = is.read(buffer)) != -1) {

                //每次都是从buffer内存处的0偏移开始写，每次写len字节

                os.write(buffer, 0, len);

           }

           os.close();

           is.close();

           System.out.println(path);//用来查看文件所在路径

           System.out.println(file.getOriginalFilename());

           return "/index.jsp";

     }

---

五、批量上传

 

     JSP页面：

     <form action="upload.do" method="post" enctype="multipart/form-data">

           file1:<input name="files" type="file" /><br>

           file2:<input name="files" type="file" /><br>

           <input type="submit" value="上传" />

     </form>

     Controller代码：

@RequestMapping(value = "/upload")

     public String fileupload(@RequestParam("files")CommonsMultipartFile[] files, HttpServletRequest request)

                throws IOException {

           for(CommonsMultipartFile file : files) {

                

                //判断到底是由file==null还是由file.getOriginalFilename()==""引起的单个文件上传出错

                System.out.println(file+":"+file.getOriginalFilename());

                //解决file.getOriginalFilename()==""会引起单个文件上传出错

                if(file.getOriginalFilename() == "") {

                     continue;

                }

                //获取文件名

                String fileName = file.getOriginalFilename();

                //获取上传文件的路径

                //String path = request.getRealPath("/fileupload");

                String path = request.getServletContext().getRealPath("/fileupload");

                InputStream is = file.getInputStream();

                OutputStream os = new FileOutputStream(new File(path, fileName));

                int len = 0;

                byte[] buffer = new byte[400];

                while((len = is.read(buffer)) != -1) {

                     //每次都是从buffer内存处的0偏移开始写，每次写len字节

                     os.write(buffer, 0, len);

                }

                os.close();

                is.close();

           }