JSP实现上传文件的两种方法介绍
发布时间：2023-05-15 14:54:12 所属栏目：教程 来源：
导读：在用java开发企业器系统的使用,特别是涉及到与办公相关的软件开发的时候,文件的上传是客户经常要提到的要求.因此有 一套很好文件上传的解决办法也能方便大家在这一块的开发.
首先申明,该文章是为了自己记录一备以
首先申明,该文章是为了自己记录一备以
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在用java开发企业器系统的使用,特别是涉及到与办公相关的软件开发的时候,文件的上传是客户经常要提到的要求.因此有 一套很好文件上传的解决办法也能方便大家在这一块的开发. 首先申明,该文章是为了自己记录一备以后开发需要的时候,不用手忙脚乱哈哈........ 现在在国内用的非常多的一般是两种方法解决来解决文件上传. cos.jar + uploadbean.jar + filemover.jar 这个是用的非常普遍的,原因是因为他操作方便,是我们不必再去关注,那些文件的输入和输出流,使我们从底层的流中解脱出来. uploadfile,uploadbean,multipartformdatarequest <%@ page contenttype="text/html;charset=gb2312" %> <head> <title>fbysss 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> <form name="form1" method="post" action="sssupload.jsp" enctype="multipart/form-data"> <input name="title" type= "text" value="中文字"> <td class="bodystyle">附件</td> <td class="bodystyle"> <input name="attach" type="file" id="attach" size="50" > </td> <input name="ok" type= "submit" value="提交"> </form> 2.读取表单页面sssgetdata.jsp <!-- //========================================================================== //文件：uploadbean上传实例 //功能：解决中文乱码，完成文件上传，并提供上传改名解决方案 //作者：fbysss //msn:[email protected] //========================================================================== --> <%@ page contenttype="text/html;charset=gbk" %> <%@ page language="java" import="com.jspsmart.upload.*"%> <%@ 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=gb2312"> </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); } %> demo注意事项：cos.jar，uploadbean.jar，filemover.jar这几个包必须有。 必备下载地址： uploadbean1.5：http://wcarchive.cdrom.com/pub/simtelnet/winnt/java/uploadbean1_5.zip filemover1.3：http://www.javazoom.net/jzservlets/uploadbean/addons/filemover1.3.zip 参考下载地址： chinesupload例子：http://www.javazoom.net/jzservlets/uploadbean/addons/chineseupload.zip 参考了fbysss的一篇文章 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--> 注册会员，创建你的web开发资料库， （编辑：聊城站长网） 【声明】本站内容均来自网络，其相关言论仅代表作者个人观点，不代表本站立场。若无意侵犯到您的权利，请及时与联系站长删除相关内容! |
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