基于SpringMVC的上传和下载

 <!-- 配置用于上传的MultipertResolver -->  
        <bean id="multipartResolver"  
            class="org.springframework.web.multipart.commons.CommonsMultipartResolver">  
            <!-- 设置字符编码 -->  
            <property name="defaultEncoding" value="UTF-8"></property>  
            <!-- 设置上传的maxUploadSize -->  
            <property name="maxUploadSize" value="102400"></property>  
        </bean> 

package com.imooc.controller;
import java.io.File;

import javax.servlet.http.HttpServletRequest;

import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.multipart.MultipartFile;
@Controller
public class UploadAction {
    // 文件上传功能
    @RequestMapping("/fileUpload.action")
    public String fileUpload(MultipartFile file,HttpServletRequest request) throws Exception {
        if (!file.isEmpty()) {
            //打印文件的名称
            //System.out.println("FileName:" + file.getOriginalFilename());
            //确定上传文件的位置        
            String path = request.getServletContext().getRealPath("/fileupload");  
            //String path = "E:/WorkSpace1/SpringMVCDemo/WebContent/WEB-INF/fileupload";
            File newFile = new File(path, file.getOriginalFilename());
            if (!newFile.exists()) {
                newFile.createNewFile();
            }
            // 上传
            file.transferTo(newFile);
        }
        //上传成功后转发到success.jsp
        return "success";
    }

}

 <form action="fileUpload.action" method="post"  enctype="multipart/form-data">
        File<input type="file" name="file">  
        <input type="submit">
 </form>

package com.imooc.controller;

import java.io.File;

import org.apache.commons.io.FileUtils;
import org.springframework.http.HttpHeaders;
import org.springframework.http.HttpStatus;
import org.springframework.http.MediaType;
import org.springframework.http.ResponseEntity;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;

@Controller
public class DownLoadAction {
	
	
	@RequestMapping("/fileDownLoad.action")
	public ResponseEntity<byte[]> fileDownload() throws Exception {
		//文件的路径，当然你可以自己拼接
		String path = "E:/WorkSpace1/SpringMVCDemo/WebContent/WEB-INF/fileupload/1.png";
		File file = new File(path);
		HttpHeaders headers = new HttpHeaders();
		// 为了解决中文名称乱码问题
		String fileName = new String(file.getName().getBytes("UTF-8"), "iso-8859-1");
		headers.setContentDispositionFormData("attachment", fileName);
		headers.setContentType(MediaType.APPLICATION_OCTET_STREAM);
		return new ResponseEntity<byte[]>(FileUtils.readFileToByteArray(file), headers, HttpStatus.CREATED);
	}
	

}

	<a href="fileDownLoad.action">文件下载</a>