基于SpringMVC的上传和下载

基于SpringMVC的上传功能

 1丶在SpringMVC的项目的基础之上，加入上传下载的jar包

   

2丶在SpringMVC的配置文件中加入用于上传下载的Bean

<!-- 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>

3丶编写Controller

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";
    }

}

4丶编写JSP页面

注意：form的一个属性值     enctype="multipart/form-data"

enctype="multipart/form-data">
        File<input type="file" name="file">  
        <input type="submit">
 </form>

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基于文件的下载功能

1丶在上面的基础上

2丶编写DownLoadAction

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);
  }
  

}

3丶编写JSP页面代码

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

OK,that is all,good luck to you