JSP实现上传文件的两种方法

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我是靠谱客的博主怡然小蜜蜂，最近开发中收集的这篇文章主要介绍JSP实现上传文件的两种方法，觉得挺不错的，现在分享给大家，希望可以做个参考。

概述

Demo注意事项：cos.jar，uploadbean.jar，filemover.jar这几个包必须有。

下载地址：

http://download.csdn.net/detail/sinat_34803353/9688296

<%@ page contentType="text/html;charset=utf-8"%>
<html>
<title>UploadBean 示例</title>
<!--meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1"-->
<!--meta http-equiv="Content-Type" content="text/html; charset=gb2312"-->
</head>
<body>
<form name="form1" METHOD="POST" ACTION="sssupload.jsp" ENCTYPE="multipart/form-data">  
    请选择你要上传的文件：<input name="attach" type="FILE" id="attach" size="50" ><br>
    <input name="title" type= "text" value="中文字"><br>  
    <input type="submit" value="提交2">   
  </form>
  
</body>
</html>

2.读取表单页面sssgetdata.jsp

<%@ page contentType="text/html;charset=GBK"   %>
<%@ page import="java.text.SimpleDateFormat" %>
<%@ page import="java.io.File" %>
<%@ page import="java.util.*" %>
<%@ page import="javazoom.upload.*" %>
<%@ page import="uploadutilities.FileMover" %>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
</head>
	<%
		request.setCharacterEncoding("GBK");//设置编码格式，就不用一个个转码了。
		FileMover fileMover = new FileMover();//你也可以使用自带的实例中jsp:useBean的形式。
		UploadBean upBean = new UploadBean();
		MultipartFormDataRequest mrequest = null;
		Hashtable files = null;
		
		if (MultipartFormDataRequest.isMultipartFormData(request))
		{
		mrequest = new MultipartFormDataRequest(request,null,100*1024*1024,MultipartFormDataRequest.COSPARSER,"GBK");//注意这里也要设置编码参数
		String sTt0 = mrequest.getParameter("title");
		out.println("<br>Title0是："+sTt0+"<br>");
		String sTt1 = new String(sTt0.getBytes("ISO-8859-1"),"GBK");
		out.println("<br>Title1是："+sTt1+"<br>");
		//这里用来测试title参数是否正确。调试的时候，加一句if (true)return;即可。
		files = mrequest.getFiles();
}


		//获取修改前的文件名
		String sOldFileName =mrequest.getParameter("oldfilename"); 
		out.println("sOldFileName:"+sOldFileName);
		String sWebRootPath = request.getRealPath("/");//得到你的web应用的根。
		String sPath=sWebRootPath+"attach";
		int iFileCount = 0;
		String sServerFileName="";
		String sLocalFileName = "";
		//文件获取
		if ( (files != null) || (!files.isEmpty()) ) {
		
		iFileCount = files.size();
		UploadFile file = (UploadFile)files.get("attach");
		sLocalFileName=file.getFileName();
		out.println("sLocalFileName:"+sLocalFileName);
		int ii= sLocalFileName.indexOf("."); //取文件名的后缀
		String sExt = sLocalFileName.substring(ii,sLocalFileName.length());
		//得到不重复的文件名
		java.util.Date dt = new java.util.Date(System.currentTimeMillis());
		SimpleDateFormat fmt = new SimpleDateFormat("yyyyMMddHHmmssSSS");
		sServerFileName= fmt.format(dt);
		sServerFileName =sServerFileName + sExt;
		//如果不存在该目录，则新建一个
		File dir =new File(sPath);
		if (!dir.exists()){
		dir.mkdirs();
		}
		upBean.setFolderstore(sPath);//设置要上传的目录
		upBean.addUploadListener(fileMover);//增加filMover监听
		fileMover.setNewfilename(sServerFileName);//设置服务器上的文件名
		upBean.store(mrequest, "attach");//上传
		out.println("file path is "+sPath+"/"+sServerFileName);
		}

%>

2. org.apache.struts.upload.FormFile
Struts1.1的org.apache.struts.upload.FormFile类。很方便，不用自己写。也不用写一个jsp调用jspsmartupload就可以搞定。

选择上传文件页面：selfile.jsp

<％@ taglib uri="/WEB-INF/struts-html.tld" prefix="html"％>
<html:html>
<html:form action="/uploadsAction.do" enctype="multipart/form-data">
<html:file property="theFile"/>
<html:submit/>
</html:form>
</html:html>

UpLoadAction.java

import java.io.*;
import javax.servlet.http.*;
import org.apache.struts.action.*;
import org.apache.struts.upload.FormFile;

/**
* <p>Title:UpLoadAction</p>
* <p>Description: QRRSMMS </p>
* <p>Copyright: Copyright (c) 2004 jiahansoft</p>
* <p>Company: jiahansoft</p>
* @author wanghw
* @version 1.0
*/

public class UpLoadAction extends Action {
public ActionForward execute(ActionMapping mapping,
ActionForm form,
HttpServletRequest request,
HttpServletResponse response)
throws Exception {
if (form instanceof uploadsForm) {//如果form是uploadsForm
String encoding = request.getCharacterEncoding();
if ((encoding != null) && (encoding.equalsIgnoreCase("utf-8")))
{
response.setContentType("text/html; charset=gb2312");//如果没有指定编码，编码格式为gb2312
}
UpLoadForm theForm = (UpLoadForm ) form;
FormFile file = theForm.getTheFile();//取得上传的文件
try {
InputStream stream = file.getInputStream();//把文件读入
String filePath = request.getRealPath("/");//取当前系统路径
ByteArrayOutputStream baos = new ByteArrayOutputStream();
OutputStream bos = new FileOutputStream(filePath + "/" +
file.getFileName());//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(Exception e){
System.err.print(e);
}
//request.setAttribute("dat",file.getFileName());
return mapping.findForward("display");
}
return null;
}
}

UpLoadForm.java

import javax.servlet.http.HttpServletRequest;
import org.apache.struts.action.*;
import org.apache.struts.upload.*;

/**
* <p>Title:UpLoadForm</p>
* <p>Description: QRRSMMS </p>
* <p>Copyright: Copyright (c) 2004 jiahansoft</p>
* <p>Company: jiahansoft</p>
* @author wanghw
* @version 1.0
*/

public class UpLoadForm extends ActionForm {
public static final String ERROR_PROPERTY_MAX_LENGTH_EXCEEDED = "org.apache.struts.webapp.upload.MaxLengthExceeded";
protected FormFile theFile;
public FormFile getTheFile() {
return theFile;
}
public void setTheFile(FormFile theFile) {
this.theFile = theFile;
}
public ActionErrors validate(ActionMapping mapping, HttpServletRequest request)
{
ActionErrors errors = null;
//has the maximum length been exceeded?
Boolean maxLengthExceeded = (Boolean)
request.getAttribute(MultipartRequestHandler.ATTRIBUTE_MAX_LENGTH_EXCEEDED);
if ((maxLengthExceeded != null) && (maxLengthExceeded.booleanValue()))
{
errors = new ActionErrors();
errors.add(ERROR_PROPERTY_MAX_LENGTH_EXCEEDED, new ActionError("maxLengthExceeded"));
}
return errors;

}
}
//这是相对应的form，还有其他属性可以设置，具体可以参考struts的上传例子

struts-config.xml

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE struts-config PUBLIC "-//Apache Software Foundation//DTD Struts Configuration 1.1//EN" "http://jakarta.apache.org/struts/dtds/struts-config_1_1.dtd";>
<struts-config>
<form-beans>
<form-bean name="uploadsForm" type="UpLoadForm" />
</form-beans>
<action-mappings>
<action name="uploadsForm" type="UpLoadAction" path="/uploadsAction">
<forward name="display" path="/display.jsp" />
</action>
</action-mappings>
</struts-config>
<!--display.jsp就是随便写一个成功页-->