MultipartFile(文件的上传)--CommonsMultipartResolver

SpringMVC 中，文件的上传，是通过 MultipartResolver 实现的。 所以，如果要实现文件的上传，只要在 spring-mvc.xml 中注册相应的 MultipartResolver 即可。
Spring_mvc.xml配置

    <!-- SpringMVC上传文件时，需要配置MultipartResolver处理器 -->
    <bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver">
        <property name="defaultEncoding" value="utf-8" />
        <property name="maxUploadSize" value="10485760000" />
        <property name="maxInMemorySize" value="40960" />
    </bean>

CommonsMultipartResolver 上传用到的两个包：
commons-fileupload:commons-fileupload:1.3.1
commons-io:commons-io:2.4
前端Jsp

<form action="${basepath}/uploadFileAction/upload.do" method="post" enctype="multipart/form-data">  
    <input type="file" name="file" />
    <input type="file" name="file" />
    <input type="submit" value="Submit" />
</form> 

后台服务端

package net.jsshop.web.action;

import java.io.File;
import java.util.List;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.multipart.MultipartFile;
import org.springframework.web.multipart.MultipartHttpServletRequest;
import com.alibaba.fastjson.JSONObject;

@Controller
@RequestMapping(value = "/uploadFileAction")
public class uploadFileAction {
    @RequestMapping(value = "/upload.do")
    public void upload2(HttpServletRequest request, HttpServletResponse response) throws Exception {
        System.out.println("开始上传");
        MultipartHttpServletRequest multiRequest = (MultipartHttpServletRequest) request;
        List<MultipartFile> fileList = multiRequest.getFiles("file");

        String sb = "";
        for (MultipartFile mf : fileList) {
            if (!mf.isEmpty()) {
                // 取得当前上传文件的名称
                String myFileName = mf.getOriginalFilename();
                // 如果名称不为""，说明该文件存在，否则说明文件不存在。
                if (myFileName.trim() != "") {
                    System.out.println(myFileName);
                    // 重命名上传后的文件
                    String filename = "demoupload-" + mf.getOriginalFilename();
                    // 定义上传路劲
                    String path = "E:/" + filename;
                    File localFile = new File(path);
                    mf.transferTo(localFile);
                    sb = sb + path + ",";
                }
            }
        }
        if (!"".equals(sb)) {
            sb = sb.substring(0, sb.length() - 1);
            JSONObject obj = new JSONObject();
            obj.put("state", "ok");
            obj.put("message", sb);
            response.getWriter().print(obj.toString());
        } else {
            JSONObject obj = new JSONObject();
            obj.put("state", "error");
            obj.put("message", "没有上传文件");
            response.getWriter().write(obj.toJSONString());
        }
    }
}

其他示例（转载的）
http://blog.csdn.net/programmer_sir/article/details/29570935