到目前为止：我接触到的有关上传的类型有这么几种
JSP+Servlet的，Struts2的，Struts的，FTP的，ExtJs的,Flex的
最终还是建议看看，后面详细写的Struts2的上传文章最为实用
第一：JSP+Servlet上传
这个最基础的上传示例[其实也可以完全在JSP上进行处理]
我选用的包是Apache commons fileupload.jar
下载地址:http://jakarta.apache.org/commons/fileupload/
JSP页面具体代码
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%> <html> <head> <title>JSP+Servlet上传示例</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"> </head> <body> <form action="upload.do" method="post" enctype="multipart/form-data"> <input type ="file" name="file1" id="file1" /><br/> <input type ="file" name="file2" if="file2"/><br/> <input type ="file" name="file3" id="file3"/><br/> <input type="submit" value="上传" /> </form> </body> </html>
上 面文件中有几个需要注意的地方就是
1. action="UploadServlet" 必须和后面的web.xml配置文件中对servlet映射必须保持一致.
2. method="POST" 这里必须为"POST"方式提交不能是"GET".
3. enctype="multipart/form-data" 这里是要提交的内容格式,表示你要提交的是数据流,而不是普通的表单
文本.
4. file1,file2,file3表示你要3个文件一起上传,你也可以一次只上传一个文件.
Servlet处理类程序
package com.upload.test; import java.io.BufferedInputStream; import java.io.BufferedOutputStream; import java.io.File; import java.io.FileOutputStream; import java.io.IOException; import javax.servlet.ServletException; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import org.apache.commons.fileupload.FileItemIterator; import org.apache.commons.fileupload.FileItemStream; import org.apache.commons.fileupload.disk.DiskFileItemFactory; import org.apache.commons.fileupload.servlet.ServletFileUpload; import org.apache.commons.fileupload.util.Streams; public class UploadServlet extends HttpServlet { File tmpDir = null;//初始化上传文件的临时存放目录 File saveDir = null;//初始化上传文件后的保存目录 public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { this.doPost(request, response); } public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { request.setCharacterEncoding("utf-8"); try{ if(ServletFileUpload.isMultipartContent(request)){ DiskFileItemFactory dff = new DiskFileItemFactory();//创建该对象 dff.setRepository(tmpDir);// 指定上传文件的临时目录 dff.setSizeThreshold(1024000);//指定在内存中缓存数据大小,单位为byte ServletFileUpload sfu = new ServletFileUpload(dff);//创建该对象 sfu.setFileSizeMax(5000000);// 指定单个上传文件的最大尺寸 sfu.setSizeMax(10000000);//指定一次上传多个文件的 总尺寸 FileItemIterator fii = sfu.getItemIterator(request);//解析request 请求, 并返回FileItemIterator集合 while(fii.hasNext()){ FileItemStream fis = fii.next();//从集合中获得一个文件流 if(!fis.isFormField() && fis.getName().length()>0){//过滤掉表单中非文件 域 String fileName = fis.getName().substring(fis.getName().lastIndexOf ("\\"));//获得上传文件的文件名 BufferedInputStream in = new BufferedInputStream(fis.openStream());//获 得文件输入流 BufferedOutputStream out = new BufferedOutputStream(new FileOutputStream(new File(saveDir+fileName)));//获得文件输出流 Streams.copy(in, out, true);//开始把文件写到你指定的上传文件夹 } } response.getWriter().println("File upload successfully!!!");//终于成功了 ,还不到你的上传文件中看看,你要的东西都到齐了吗 } }catch(Exception e){ e.printStackTrace(); } } @Override public void init() throws ServletException { super.init(); /* 对上传文件夹和临时文件夹进行初始化 * */ String tmpPath = "c:\\tmpdir"; String savePath = "c:\\updir"; tmpDir = new File(tmpPath); saveDir = new File(savePath); if(!tmpDir.isDirectory()) tmpDir.mkdir(); if(!saveDir.isDirectory()) saveDir.mkdir(); } }
第二：struts2的上传吧
upload.jsp-----------
<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%> <%@ taglib uri="/struts-tags" prefix="s"%> <% 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> </head> <body> <s:form action="test.action" method="POST" enctype="multipart/form-data"> <s:file label="选择文件" name="upFile"></s:file> <s:submit label="上传" /> </s:form> </body> </html>
UploadAction----------------
package com.upload.test; import java.io.BufferedInputStream; import java.io.BufferedOutputStream; import java.io.File; import java.io.FileInputStream; import java.io.FileOutputStream; import com.opensymphony.xwork2.ActionSupport; public class UploadAction extends ActionSupport { private File upFile; private String upFileFileName; //上传的文件名 (1.系统自动注入 2.变量命名有规则: 前台 对象名+"FileName") private String upFileContentType; //文件类型 (1.系统自动注入 2.变量命名有规 则: 前台对象名+"ContentType") private String savePath; @Override public String execute() throws Exception { System.out.println("xxxxxxxxxxxxxxxxxxxxxxxxxxx"); String path = "c:/" + upFileFileName; BufferedInputStream bis = null; BufferedOutputStream bos = null; try{ bis = new BufferedInputStream(new FileInputStream(upFile)); bos = new BufferedOutputStream(new FileOutputStream(path)); byte[] buf = new byte[(int)upFile.length()]; int len = 0; while(((len=bis.read(buf))!=-1)){ bos.write(buf, 0, len); } }catch(Exception e){ e.printStackTrace(); }finally{ try{ if(bos!=null){ bos.close(); } if(bis!=null){ bis.close(); } }catch(Exception e){ bos = null; bis = null; } } return SUCCESS; } public File getUpFile() { return upFile; } public void setUpFile(File upFile) { this.upFile = upFile; } public String getUpFileFileName() { return upFileFileName; } public void setUpFileFileName(String upFileFileName) { this.upFileFileName = upFileFileName; } public String getUpFileContentType() { return upFileContentType; } public void setUpFileContentType(String upFileContentType) { this.upFileContentType = upFileContentType; } public String getSavePath() { return savePath; } public void setSavePath(String savePath) { this.savePath = savePath; } }
struts.xml-------
<?xml version="1.0" encoding="UTF-8" ?> <!DOCTYPE struts PUBLIC "-//Apache Software Foundation//DTD Struts Configuration 2.1//EN" "http://struts.apache.org/dtds/struts-2.1.dtd"> <struts> <!-- 该属性指定Struts 2文件上传中整个请求内容允许的最大字节数 --> <constant name="struts.multipart.maxSize" value="102400000000000" /> <package name="default" extends="struts-default" > <action name="test" class="com.upload.test.TestAction"> <result >/index.jsp</result> </action> </package> </struts>
web.xml------
<?xml version="1.0" encoding="UTF-8"?> <web-app version="2.5" xmlns="http://java.sun.com/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"> <welcome-file>index.jsp</welcome-file> </welcome-file-list> <filter> <filter-name>struts2</filter-name> <filter-class> org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter </filter-class> </filter> <filter-mapping> <filter-name>struts2</filter-name> <url-pattern>/*</url-pattern> </filter-mapping> </web-app>
特别说明这条的必要性，可以使你上传任意大小文件
<constant name="struts.multipart.maxSize" value="102400000000000" />
关于FLEX的上传在我博客文章：http://javacrazyer.iteye.com/blog/707693
关于EXT的上传在我博客文章：http://javacrazyer.iteye.com/blog/707510
关于FTP的上传在我的博客文章：http://javacrazyer.iteye.com/blog/675440
关于Struts的上传在我的博客文章： http://javacrazyer.iteye.com/blog/619016