spring mvc 文件上传工具类

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

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.springframework.web.multipart.MultipartFile;
import org.springframework.web.multipart.MultipartHttpServletRequest;
import org.springframework.web.multipart.commons.CommonsMultipartResolver;

public class FileUploadUtils {
    /**
     * 
     * @param request
     * @param storePath 文件存储相对路径 ,例如："/upload","/image","/local/file"
     * @return
     */
    public static String tranferFile(HttpServletRequest request,String storePath){
        CommonsMultipartResolver multipartResolver = new CommonsMultipartResolver(request.getSession().getServletContext()); 
        //先判断request中是否包涵multipart类型的数据，
        if(multipartResolver.isMultipart(request)){
            //再将request中的数据转化成multipart类型的数据
            MultipartHttpServletRequest multiRequest = (MultipartHttpServletRequest) request;
            Iterator iter = multiRequest.getFileNames();
            while(iter.hasNext()){
                MultipartFile file = multiRequest.getFile((String)iter.next());
                if(file != null){
                    String originalFileName = file.getOriginalFilename();
                    
                    String path =request.getSession().getServletContext().getRealPath(storePath);
                    //得到存储到本地的文件名
                    String localFileName=UUID.randomUUID().toString()+getFileSuffix(originalFileName);
                    //新建本地文件
                    File localFile = new File(path,localFileName);
　　　　　　　　　　　　//创建目录
                    File fileDir=new File(path);
                    if (!fileDir.isDirectory()) {
                        // 如果目录不存在，则创建目录
                        fileDir.mkdirs();
                    }
                    
                    
                    String src=storePath+"/"+localFileName;
                    //写文件到本地
                    try {
                        file.transferTo(localFile);
                        return src;
                    } catch (IllegalStateException e) {
                        // TODO Auto-generated catch block
                        e.printStackTrace();
                    } catch (IOException e) {
                        // TODO Auto-generated catch block
                        e.printStackTrace();
                    }
                }
            }
        }
        return null;
    }
    /**
     * 获取文件后缀
     * @param originalFileName
     * @return
     */
    public static String getFileSuffix(String originalFileName){
        int dot=originalFileName.lastIndexOf(‘.‘);
        if((dot>-1)&&(dot<originalFileName.length())){
            return originalFileName.substring(dot);
        }
        return originalFileName;
    }
}

@Controller
@RequestMapping("/file")
public class FileUploadController {

    @RequestMapping("save")
    @ResponseBody
    public String save(String name,String password,HttpServletRequest request,HttpServletResponse response){
        System.out.println("name-----------------------"+name);
        System.out.println("password-----------------------"+password);return FileUploadUtils.tranferFile(request, "/upload");
    }
}

<h2>文件上传</h2>
<form name="upload" action="/file/save" enctype="multipart/form-data" method="post">
　　姓名：<input name="name" type="text">
　　密码：<input name="password" type="text">
　　文件：<input type="file" name="thefile" /> 
　　<input type="submit" value="上传文件" />
</form>

<!-- 支持上传文件 -->
    <bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver">
        <property name="defaultEncoding" value="UTF-8"></property>
        <property name="maxUploadSize" value="20000000"></property>
    </bean>