struts2学习笔记（十）利用fileUpload实现文件的上传

levinLee 2010-07-24

展开全文

今天用struts2 的fileupload 实现了文件的上传。。

1 web.xml

<?xml version="1.0" encoding="UTF-8"?>
<web-app version="2.5"
xmlns="http://java./xml/ns/javaee"
xmlns:xsi="http://www./2001/XMLSchema-instance"
xsi:schemaLocation="http://java./xml/ns/javaee
http://java./xml/ns/javaee/web-app_2_5.xsd">
<filter>
<filter-name>struts2</filter-name>
<filter-class>org.apache.struts2.dispatcher.FilterDispatcher</filter-class>
</filter>
<filter-mapping>
<filter-name>struts2</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>
<welcome-file-list>
<welcome-file>index.jsp</welcome-file>
</welcome-file-list>

</web-app>

2 struts.xml

<?xml version="1.0" encoding="utf-8"?>
<!DOCTYPE struts PUBLIC "-//Apache Software Foundation//DTD Struts Configuration 2.0//EN" "http://struts./dtds/struts-2.0.dtd" >
<struts>
   <include file="struts-default.xml"></include>
   
   <constant name="struts.i18n.encoding" value="gbk"></constant>
   <constant name="struts.multipart.saveDir" value="d:\struts2upload\"></constant>

   <package name="struts2ofupload" extends="struts-default">
       <action name="upload" class="com.struts2.action.UploadAction">
          <result name="show">/show.jsp</result>
              <result>/index.jsp</result>
          <result name="input">/index.jsp</result>


     <interceptor-ref name="fileUpload">
          <param name="allowedTypes">application/vnd.ms-powerpoint,image/bmp,image/png,image/gif,image/jpeg,image/pjpeg,image/jpg,application/msword,audio/x-mpeg,text/html,text/plain</param>
          <param name="maximumSize">8192000</param>
          </interceptor-ref>
          <interceptor-ref name="defaultStack"></interceptor-ref>
       </action>
   </package>
</struts>

3 action

package com.struts2.action;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.List;

import org.apache.struts2.ServletActionContext;

import com.opensymphony.xwork2.ActionSupport;

public class UploadAction extends ActionSupport {

private List<File> file;

private List<String> fileFileName;

private List<String> fileContentType;

public List<File> getFile() {
return file;
}

public void setFile(List<File> file) {
this.file = file;
}

public List<String> getFileContentType() {
return fileContentType;
}

public void setFileContentType(List<String> fileContentType) {
this.fileContentType = fileContentType;
}

public List<String> getFileFileName() {
return fileFileName;
}

public void setFileFileName(List<String> fileFileName) {
this.fileFileName = fileFileName;
}

/**
* 动态上传文件
* @return
* @throws Exception
*/
public String Upload() throws Exception {

InputStream is=null;
OutputStream ops=null;
     for(int i=0;i<file.size();i++){
     try{
is=new FileInputStream(file.get(i));
String root=ServletActionContext.getRequest().getRealPath("/uploads");
File destFile=new File(root+"/",this.getFileFileName().get(i));
//File destFile=new File(root,this.getFileFileName().get(i));
ops=new FileOutputStream(destFile);
byte [] b=new byte[400];
int length=0;
while((length=is.read(b))>0){
ops.write(b,0,length);
//ops.write(b); 这样子同样可行
}
}catch(Exception ex){
ex.printStackTrace();
}finally{
is.close();
ops.close();
}
     }
return "show";
}
}

4 jsp

<%@ page language="java" import="java.util.*" pageEncoding="gbk"%>
<%@ taglib prefix="s" uri="/struts-tags" %>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<title>My JSP 'upload.jsp' starting page</title>

var br=document.createElement("br");
var input=document.createElement("input");
var button=document.createElement("input");

input.type="file";
input.name="file";

button.type="button";
button.value="-";

button.onclick=function(){
td.removeChild(br);
td.removeChild(input);
td.removeChild(button);
}
td.appendChild(br);
td.appendChild(input);
td.appendChild(button);
}
</script>

</head>

<body>
   <s:form action="upload!Upload.action" method="post" enctype="multipart/form-data">
   <table align="center" width="60%" border="1">
   <tr>
   <td>
   选择上传的文件:
   </td>
   <td id="more">
   <%--<s:file name="file" label="选择上传的文件"></s:file>--%>
   <input type="file" name="file">
   <input type="button" value="+" onclick="addMore()"/>
   </td>
   </tr>
   <tr>
   <td>
   </td>
   <td>
   <s:submit value="上传" align="center"></s:submit>
   </td>
   </tr>
   </table>
   </s:form>
</body>
</html>

我试了下，上传成功，比较好用。

可以通过设置<param name="allowedTypes">来设定上传文件的类型，<param name="maximumSize">8192000</param>来设置上传文件的最大极限。