struts1的多文件下传

2012-09-06

struts1的多文件上传//action的代码package cn.itcast.actionsimport java.io.Fileimport java.io.FileO

struts1的多文件上传

//action的代码

package cn.itcast.actions;

import java.io.File;
import java.io.FileOutputStream;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.UUID;

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

import org.apache.struts.action.ActionForm;
import org.apache.struts.action.ActionForward;
import org.apache.struts.action.ActionMapping;
import org.apache.struts.actions.DispatchAction;
import org.apache.struts.upload.FormFile;

import cn.itcast.forms.FileUploadForm;

public class UploadFileAction extends DispatchAction {

public ActionForward uploadFile(ActionMapping mapping, ActionForm form,
   HttpServletRequest request, HttpServletResponse response)
   throws Exception {

  //这是清空缓存
  response.addHeader("cache-control", "no-cache");
  response.addHeader("expires", "0");
  response.addHeader("pragma", "no-cache");
  FileUploadForm fileUploadForm = (FileUploadForm)form;
  String savePath = request.getSession().getServletContext().getRealPath("/upload");
  //这是判断这个目录是否存在，如果存在就不建立，如果不存在就建立一个目录
  File file2 = new File(savePath);
  if(!file2.exists())
  {
   file2.mkdirs();
  }
  //这是删除原来存在的文件
  File[] files = file2.listFiles();
  System.out.println(files.length);
  if(files.length > 0)
  {
   for (int i = 0; i < files.length; i++) {
    files[i].delete();
   }
  }
  OutputStream out = null;
  InputStream in = null;
  System.out.println(fileUploadForm.getCount());
  for(int i = 0; i < fileUploadForm.getCount(); i++)
  {
   FormFile file = fileUploadForm.getUploadfile(i);
   in = file.getInputStream();
   byte [] buffer = new byte[1024];
   int len = 0;
   //这是给每个文件取一个不同名字
   UUID uuid = UUID.randomUUID();
   String prefix = uuid.toString();
   String subbfix = file.getFileName().substring(file.getFileName().lastIndexOf("."));
   String fileName = prefix + subbfix;
   File file3 = new File(file2, fileName);
   len = in.read(buffer);
   out = new FileOutputStream(file3);
   while(len > 0)
   {
    //这是给文件取名字
    out.write(buffer, 0, len);
    len = in.read(buffer);
   }
   out.flush();
  }
  in.close();
  out.close();
  //每提交一次就会清空list中原来存在的文件，这样可以防止当我们第二次提交的时候会提交重复的文件
  fileUploadForm.getList().clear();
  return mapping.findForward("success");
}

}

//form的代码

package cn.itcast.forms;

import java.io.Serializable;
import java.util.ArrayList;
import java.util.List;

import org.apache.struts.action.ActionForm;
import org.apache.struts.upload.FormFile;

public class FileUploadForm extends ActionForm implements Serializable {

private List<FormFile> list = new ArrayList<FormFile>();
public List<FormFile> getList() {
  return list;
}
public void setList(List<FormFile> list) {
  this.list = list;
}
public FormFile getUploadfile(int i)
{
  return list.get(i);
}
public void setUploadfile(int i, FormFile file)
{
  //只有上传文件的字节数大于0，才能够上传
  if(file.getFileSize() > 0)
  {
   list.add(file);
  }
}
//这是得到文件的数量
public int getCount()
{
  return list.size();
}
}

//struts-config的代码

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE struts-config PUBLIC "-//Apache Software Foundation//DTD Struts Configuration 1.2//EN" "http://struts.apache.org/dtds/struts-config_1_2.dtd">

<struts-config>
<data-sources />
<form-beans>
<form-bean name="uploadForm" type="cn.itcast.forms.FileUploadForm"></form-bean>
</form-beans>
<global-exceptions />
<global-forwards />
<action-mappings>
<action path="/upload" name="uploadForm" type="cn.itcast.actions.UploadFileAction" parameter="p">
<forward name="success" path="/success.jsp"></forward>
</action>
</action-mappings>


<controller maxFileSize="-1" />
<message-resources parameter="com.yourcompany.struts.ApplicationResources" />
</struts-config>

//web.xml的代码

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns="http://java.sun.com/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" version="2.5" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee  http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd">
<servlet>
    <servlet-name>action</servlet-name>
    <servlet-class>org.apache.struts.action.ActionServlet</servlet-class>
    <init-param>
      <param-name>config</param-name>
      <param-value>/WEB-INF/struts-config.xml</param-value>
    </init-param>
    <init-param>
      <param-name>debug</param-name>
      <param-value>3</param-value>
    </init-param>
    <init-param>
      <param-name>detail</param-name>
      <param-value>3</param-value>
    </init-param>
    <load-on-startup>0</load-on-startup>
</servlet>
<servlet-mapping>
    <servlet-name>action</servlet-name>
    <url-pattern>*.do</url-pattern>
</servlet-mapping>
<welcome-file-list>
    <welcome-file>index.jsp</welcome-file>
</welcome-file-list>
</web-app>

//jsp

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
    <base href="<%=basePath%>">

    <title>My JSP 'upload.jsp' starting page</title>

<meta http-equiv="pragma" content="no-cache">
<meta http-equiv="cache-control" content="no-cache">
<meta http-equiv="expires" content="0">
<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
<meta http-equiv="description" content="This is my page">

<script type="text/javascript" src="js/jquery-1.2.6.js"></script>
<script type="text/javascript">
  var i = 0;
  function addFile(it)
  {
   var c = $(it).next().clone(true);
   i++;
   c.children("input").attr("name","uploadfile["+i+"]");
   var p = $("form input:last").prev();
   p.after(c);

  }
</script>
</head>

<body>
      <form action="${pageContext.request.contextPath}/upload.do?p=uploadFile" method="post" enctype="multipart/form-data"><input type="button" onclick="addFile(this)" value="增加"/>
      <div><input type="file" name="uploadfile[0]"/><br/></div>
      <input type="submit" value="提交"/>
      </form>
</body>
</html>

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