用Java的三大框架实现文件的上传下载，求代码啊，最好是分为action,service,serv

package cn.itcast.struts2.demo1

import java.io.File

import org.apache.commons.io.FileUtils

import org.apache.struts2.ServletActionContext

import com.opensymphony.xwork2.ActionSupport

/**

* 完成文件上传 （不是解析上传内容，因为上传内容 由fileUpload拦截器负责解析）

*

* @author seawind

*

*/

public class UploadAction extends ActionSupport {

// 接收上传内容

// <input type="file" name="upload" />

private File upload// 这里变量名 和 页面表单元素 name 属性一致

private String uploadContentType

private String uploadFileName

public void setUpload(File upload) {

this.upload = upload

}

public void setUploadContentType(String uploadContentType) {

this.uploadContentType = uploadContentType

}

public void setUploadFileName(String uploadFileName) {

this.uploadFileName = uploadFileName

}

@Override

public String execute() throws Exception {

if (upload == null) { // 通过xml配置 required校验器 完成校验

// 没有上传文件

return NONE

}

// 将上传文件 保存到服务器端

// 源文件 upload

// 目标文件

File destFile = new File(ServletActionContext.getServletContext()

.getRealPath("/upload") + "/" + uploadFileName)

// 文件复制 使用commons-io包 提供 工具类

FileUtils.copyFile(upload, destFile)

return NONE

}

}

多文件上传

package cn.itcast.struts2.demo1

import java.io.File

import org.apache.commons.io.FileUtils

import org.apache.struts2.ServletActionContext

import com.opensymphony.xwork2.ActionSupport

/**

* 支持多文件上传

*

* @author seawind

*

*/

public class MultiUploadAction extends ActionSupport {

// 接收多文件上传参数，提供数组接收就可以了

private File[] upload

private String[] uploadContentType

private String[] uploadFileName

public void setUpload(File[] upload) {

this.upload = upload

}

public void setUploadContentType(String[] uploadContentType) {

this.uploadContentType = uploadContentType

}

public void setUploadFileName(String[] uploadFileName) {

this.uploadFileName = uploadFileName

}

@Override

public String execute() throws Exception {

for (int i = 0i <upload.lengthi++) {

// 循环完成上传

File srcFile = upload[i]

String filename = uploadFileName[i]

// 定义目标文件

File destFile = new File(ServletActionContext.getServletContext()

.getRealPath("/upload" + "/" + filename))

FileUtils.copyFile(srcFile, destFile)

}

return NONE

}

}

Java代码实现文件上传

  FormFile file=manform.getFile() 

  String newfileName = null

  String newpathname=null

  String fileAddre="/numUp"

  try {

   InputStream stream = file.getInputStream()// 把文件读入

    String filePath = request.getRealPath(fileAddre)//取系统当前路径

          File file1 = new File(filePath)//添加了自动创建目录的功能

       ((File) file1).mkdir()   

    newfileName = System.currentTimeMillis()

     + file.getFileName().substring(

       file.getFileName().lastIndexOf('.'))

   ByteArrayOutputStream baos = new ByteArrayOutputStream()

   OutputStream bos = new FileOutputStream(filePath + "/"

     + newfileName)

   newpathname=filePath+"/"+newfileName

   System.out.println(newpathname)

   // 建立一个上传文件的输出流

    System.out.println(filePath+"/"+file.getFileName())

   int bytesRead = 0

   byte[] buffer = new byte[8192]

   while ((bytesRead = stream.read(buffer, 0, 8192)) != -1) {

    bos.write(buffer, 0, bytesRead)// 将文件写入服务器

   }

   bos.close()

   stream.close()

    } catch (FileNotFoundException e) {

   e.printStackTrace()

  } catch (IOException e) {

   e.printStackTrace()

  }

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