springmvc文件上传示例

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

        选择文件:<input type="file" name="file"> 
　　　　　　　　　<br> 
　　　　　　　　　<input type="submit" value="提交">
 </form>

package controller;

import java.io.File;
import java.io.IOException;
import java.util.UUID;

import javax.servlet.http.HttpServletRequest;

import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.multipart.MultipartFile;

@Controller
public class UploadController {
    @RequestMapping("upload.do")
    public String upload(HttpServletRequest request, String userName, @RequestParam(value = "file") MultipartFile file)
            throws IllegalStateException, IOException {
        String upload_path = request.getSession().getServletContext().getRealPath("upload");
        String file_name = file.getOriginalFilename();
        file_name = file_name.substring(file_name.lastIndexOf("\\") + 1);
        String final_pathname = upload_path + "\\" + UUID.randomUUID() + "-" + file_name;
        File f = new File(final_pathname);
        file.transferTo(f);

        return "forward:index.jsp";

    }
}

<!-- 文件上传配置 -->
    <bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver">
        <property name="maxUploadSize">
            <value>10240000</value>
        </property>
    
    </bean>