java的Spring MVC 文件上传

java的Spring MVC 文件上传

1.引入jar包

2.把文件上传的bean加入到ioc容易中（就是配置spring-mvc文件）

3.写表单开始提交数据

4.控制器接收数据

---------------------------------------

 1.一般上传文件需要用的jar包为（通过maven依赖更方便）：

    <!-- 上传组件包 -->
    <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>
    <dependency>
      <groupId>commons-codec</groupId>
      <artifactId>commons-codec</artifactId>
      <version>1.9</version>
    </dependency>

2.配置bean

    <!-- 多部分文件上传 -->
    <bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver">
        <property name="maxUploadSize" value="104857600" />
        <property name="maxInMemorySize" value="4096" />
        <property name="defaultEncoding" value="UTF-8"></property>
    </bean>

3.表单提交

    <form name="input" action="${pageContext.request.contextPath}/data/uploadFile" method="post" enctype="multipart/form-data">
        user: <input type="text" name="user" />
        file: <input type="file" name="file" />
    <input type="submit" value="Submit">
    </form>

4.控制器处理（spring MVC处理器）已经处理好了，直接接收表单的内容即可

    @RequestMapping(value = "/uploadFile", method = RequestMethod.POST)
    public @ResponseBody String uploadFile(@RequestParam("user") String user,@RequestParam("file") CommonsMultipartFile file) throws IOException{    
        long  startTime=System.currentTimeMillis();//用来检测程序运行时间
        
        System.out.println(user);//表单的文本字段        
        System.out.println(file);//表单提交过来的文件

        System.out.println("fileName："+file.getOriginalFilename());
        
        //1.获得io流
        InputStream is = file.getInputStream();
        //2.创建一个输出流，把获得的io流写到硬盘
        OutputStream os = new FileOutputStream(new File("C:\1.txt"));
        
        byte[] bs = new byte[1024];
        int len = -1;
        while((len = is.read(bs))!=-1) {
            os.write(bs,0,len);
        }
        
        os.close();
        is.close();

        return null;
    }