ssh集成应用1---多文件上传与下载-优快云博客

本文详细介绍了如何使用Java实现多文件上传和下载的功能，包括JSP页面代码、Struts2配置、以及上传和下载的Action类实现。通过本文，读者可以了解并实践文件上传与下载的基本流程。

在做这个应用时,我查找了很多资料，资料里面说的大多一样,为了大家方便查阅资料,本人自我总结了代码,欢迎提出意见

在jsp页面的代码

<%@ page language='java' import='java.util.*' pageEncoding='UTF-8'%>
<%@ taglib prefix='s' uri='/struts-tags'%>
<s:url id='baseurl' value='/' encode='false' includeParams='none'></s:url>

<!DOCTYPE HTML>
<html>
<head>
  <meta http-equiv='Content-Type' content='text/html; charset=utf-8' />
  <script type='text/javascript' src='${baseurl}js/jquery-1.7.2.min.js'></script>
  <script type='text/javascript'
   src='${baseurl}js/My97DatePicker/WdatePicker.js'></script>
  <script type='text/javascript' src='${baseurl}js/area.js'></script>
<script type="text/javascript">
function addfile() {
  var files = document.getElementById("file");
  var input = document.createElement("input");
  input.name = "files";
  input.type = "file";
  var delButton = document.createElement("input");
  delButton.type = "button";
  delButton.value = "删除";
  delButton.onclick = function del() {
   this.parentNode.parentNode.removeChild(this.parentNode);
  }
  var div = document.createElement("div");
  div.appendChild(input);
  div.appendChild(delButton);
  files.appendChild(div);

}
function fileDe(){
  var fil = document.getElementById("fi");
  fil.parentNode.parentNode.removeChild(fil.parentNode)
}
</script>
  <link rel='stylesheet' type='text/css'
   href='${baseurl }css/common.css'>
  <title>多文件上传</title>
</head>
<body>
  <h2></h2>

  <s:form action="/act/upload1.do" enctype="multipart/form-data">
   <div>
    <input type="file" name="files" />
    <input type="button" value="删除" id="fi" onclick="fileDe()" />
   </div>
   <div id="file">

   </div>
   <input type="button" value="添加文件" onclick="addfile()" />
   <s:submit value="提交" />
  </s:form>

</body>
</html>

UploadAction中的代码

package com.trans.yup.action;

import java.io.File;
import java.io.IOException;
import java.util.ArrayList;
import java.util.Date;
import java.util.HashMap;
import java.util.Map;

import org.apache.commons.io.FileUtils;
import org.apache.struts2.ServletActionContext;
import org.trans.yup.util.GeneralAction;

import com.opensymphony.xwork2.ActionContext;

//执行文件上传

public class UploadAction extends GeneralAction {

//GeneralAction：只是action类的父类,它继承ActionSupport类

private File[] files;
private String[] fileName;
private String[] contentType;
private String info;
private Map<String,String> path; //使用Map集合来保存文件名. key:重写后的文件路径 value:真实文件名

private static final long serialVersionUID = 1L;

public File[] getFiles() {
return files;
}

public void setFiles(File[] files) {
this.files = files;
}

public String[] getFileName() {
return fileName;
}

public void setFilesFileName(String[] fileName) {
this.fileName = fileName;
}

public String[] getContentType() {
return contentType;
}

public void setFilesContentType(String[] contentType) {
this.contentType = contentType;
}

public String execute() {
  if(files == null || files.length == 0)
   return SUCCESS;
  String realPath = ServletActionContext.getServletContext().getRealPath("/temp");
  info = "上传到的路径是：" + realPath;
  System.out.println("文件上传路径:"+realPath);
  try {
   path = new HashMap<String,String>();
   for(int i = 0;i < files.length;i++){
    //重写文件名
    String subfix = new Date().getTime()+fileName[i].substring(fileName[i].lastIndexOf("."));
    File file = new File(realPath +"\\"+ subfix);
    FileUtils.copyFile(files[i],file);
    String pa=fileName[i];
    path.put(realPath +"\\"+ subfix,pa);
   }
      ActionContext.getContext().getSession().put("pa", path);//保存上传文件路径
  } catch (IOException e) {
   e.printStackTrace();
  }
  return SUCCESS;
}

public String getInfo() {
return info;
}

public void setInfo(String info) {
this.info = info;
}

}

DownloadAction类代码

package com.trans.yup.action;

import java.io.InputStream;

import org.apache.struts2.ServletActionContext;
import org.trans.yup.util.GeneralAction;

/**
* 文件下载
* @author Administrator
*
*/
public class DownloadAction extends GeneralAction {

private InputStream inputStream;
private String fileName;

@Override
public String execute() throws Exception {
  return SUCCESS;
}

/** 文件名转换编码防止中文乱码*/
public String getDownloadFileName() {
    String fileName=ServletActionContext.getRequest().getParameter("fileName");
    String downFileName = fileName;
    try {
     downFileName = new String(downFileName.getBytes(), "ISO8859-1");
    } catch (Exception e) {
     e.printStackTrace();
    }
    downFileName = downFileName.substring(downFileName.lastIndexOf("\\")+1);
    return downFileName;
}

public InputStream getInputStream() {
  String name=this.getDownloadFileName();
  String realpath = "/temp/"+name;
    InputStream in=ServletActionContext.getServletContext().getResourceAsStream(realpath);
    if(null==in){
     System.out.println("Can not find a java.io.InputStream with the name [inputStream] in the invocation stack. Check the <param name=\"inputName\"> tag specified for this action.检查action中文件下载路径是否正确.");
    }
    return ServletActionContext.getServletContext().getResourceAsStream(realpath);
}

public void setInputStream(InputStream inputStream) {
  this.inputStream = inputStream;
}

public void setFileName(String fileName) {
this.fileName = fileName;
}

public String getFileName() {
return fileName.trim();
}

}

在struts2.xml配置文件代码

<action name="upload1" class="uploadAction">
   <result name="success">/upload/success.jsp</result>
   <result name="input">/upload/upload.jsp</result>
  </action>
  

  <action name="down" class="loadAction">
   <result name="success" type="stream">
    <param name="contentType">application/octet-stream;charset=ISO8859-1</param>
       <param name="inputName">inputStream</param>
       <param name="contentDisposition">attachment;filename="${downloadFileName}"</param>
       <param name="bufferSize">4096</param>
   </result>
  </action>

转载于:https://www.cnblogs.com/aiqi1029/archive/2012/12/06/ssh_fileupload_java.html