本文主要是介绍jsp/struts1.2/struts2 中文件上传,希望对大家解决编程问题提供一定的参考价值,需要的开发者们随着小编来一起学习吧!
刚刚做了三个文件上传的Demo
a.在jsp中简单利用Commons-fileupload组件实现
b.在struts1.2中实现
c.在sturts2中实现
现在把Code与大家分享一下..
注:此为三个简单Demo,仅供练习用,并没有做太多上传限制
如有兴趣可以自行查看相关文档说明
一.在JSP环境中利用Commons-fileupload组件实现文件上传
1.页面upload.jsp清单如下:
- <%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
- <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
- <html>
- <head>
- <title>The FileUpload Demo</title>
- </head>
- <body>
- <form action="UploadFile" method="post" enctype="multipart/form-data">
- <p><input type="text" name="fileinfo" value="">文件介绍</p>
- <p><input type="file" name="myfile" value="浏览文件"></p>
- <p><input type="submit" value="上 传"></p>
- </form>
- </body>
- </html>
注意:在上传表单中,既有普通文本域也有文件上传域
2.FileUplaodServlet.java清单如下:
- package org.chris.fileupload;
- import java.io.File;
- import java.io.IOException;
- import java.util.Iterator;
- import java.util.List;
- import javax.servlet.ServletException;
- import javax.servlet.http.*;
- import org.apache.commons.fileupload.FileItem;
- import org.apache.commons.fileupload.FileItemFactory;
- import org.apache.commons.fileupload.disk.DiskFileItemFactory;
- import org.apache.commons.fileupload.servlet.ServletFileUpload;
- public class FileUplaodServlet extends HttpServlet {
- protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
- doPost(request, response);
- }
- protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
- request.setCharacterEncoding("UTF-8");
- //文件的上传部分
- boolean isMultipart = ServletFileUpload.isMultipartContent(request);
- if(isMultipart)
- {
- try {
- FileItemFactory factory = new DiskFileItemFactory();
- ServletFileUpload fileload = new ServletFileUpload(factory);
- // 设置最大文件尺寸,这里是4MB
- fileload.setSizeMax(4194304);
- List<FileItem> files = fileload.parseRequest(request);
- Iterator<FileItem> iterator = files.iterator();
- while(iterator.hasNext())
- {
- FileItem item = iterator.next();
- if(item.isFormField())
- {
- String name = item.getFieldName();
- String value = item.getString();
- System.out.println("表单域名为: " + name + "值为: " + value);
- }else
- {
- //获得获得文件名,此文件名包括路径
- String filename = item.getName();
- if(filename != null)
- {
- File file = new File(filename);
- //如果此文件存在
- if(file.exists()){
- File filetoserver = new File("d://upload//",file.getName());
- item.write(filetoserver);
- System.out.println("文件 " + filetoserver.getName() + " 上传成功!!");
- }
- }
- }
- }
- } catch (Exception e) {
- System.out.println(e.getStackTrace());
- }
- }
- }
- }
3.web.xml清单如下:
- <?xml version="1.0" encoding="UTF-8"?>
- <web-app version="2.4"
- xmlns="http://java.sun.com/xml/ns/j2ee"
- xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
- xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee
- http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd">
- <servlet>
- <servlet-name>UploadFileServlet</servlet-name>
- <servlet-class>
- org.chris.fileupload.FileUplaodServlet
- </servlet-class>
- </servlet>
- <servlet-mapping>
- <servlet-name>UploadFileServlet</servlet-name>
- <url-pattern>/UploadFile</url-pattern>
- </servlet-mapping>
- <welcome-file-list>
- <welcome-file>/Index.jsp</welcome-file>
- </welcome-file-list>
- </web-app>
二.在strut1.2中实现
1.上传页面file.jsp 清单如下:
- <%@ page language="java" pageEncoding="ISO-8859-1"%>
- <%@ taglib uri="http://jakarta.apache.org/struts/tags-bean" prefix="bean"%>
- <%@ taglib uri="http://jakarta.apache.org/struts/tags-html" prefix="html"%>
- <html>
- <head>
- <title>JSP for FileForm form</title>
- </head>
- <body>
- <html:form action="/file" enctype="multipart/form-data">
- <html:file property="file1"></html:file>
- <html:submit/><html:cancel/>
- </html:form>
- </body>
- </html>
2.FileAtion.java的清单如下:
- /*
- * Generated by MyEclipse Struts
- * Template path: templates/java/JavaClass.vtl
- */
- package action;
- import java.io.*;
- import javax.servlet.http.HttpServletRequest;
- import javax.servlet.http.HttpServletResponse;
- import org.apache.struts.action.Action;
- import org.apache.struts.action.ActionForm;
- import org.apache.struts.action.ActionForward;
- import org.apache.struts.action.ActionMapping;
- import org.apache.struts.upload.FormFile;
- import form.FileForm;
- /**
- * @author Chris
- * Creation date: 6-27-2008
- *
- * XDoclet definition:
- * @struts.action path="/file" name="fileForm" input="/file.jsp"
- */
- public class FileAction extends Action {
- /*
- * Generated Methods
- */
- /**
- * Method execute
- * @param mapping
- * @param form
- * @param request
- * @param response
- * @return ActionForward
- */
- public ActionForward execute(ActionMapping mapping, ActionForm form,
- HttpServletRequest request, HttpServletResponse response) {
- FileForm fileForm = (FileForm) form;
- FormFile file1=fileForm.getFile1();
- if(file1!=null){
- //上传路径
- String dir=request.getSession(true).getServletContext().getRealPath("/upload");
- OutputStream fos=null;
- try {
- fos=new FileOutputStream(dir+"/"+file1.getFileName());
- fos.write(file1.getFileData(),0,file1.getFileSize());
- fos.flush();
- } catch (Exception e) {
- // TODO Auto-generated catch block
- e.printStackTrace();
- }finally{
- try{
- fos.close();
- }catch(Exception e){}
- }
- }
- //页面跳转
- return mapping.findForward("success");
- }
- }
3.FileForm.java的清单如下:
- package form;
- import javax.servlet.http.HttpServletRequest;
- import org.apache.struts.action.ActionErrors;
- import org.apache.struts.action.ActionForm;
- import org.apache.struts.action.ActionMapping;
- import org.apache.struts.upload.FormFile;
- /**
- * @author Chris
- * Creation date: 6-27-2008
- *
- * XDoclet definition:
- * @struts.form name="fileForm"
- */
- public class FileForm extends ActionForm {
- /*
- * Generated Methods
- */
- private FormFile file1;
- /**
- * Method validate
- * @param mapping
- * @param request
- * @return ActionErrors
- */
- public ActionErrors validate(ActionMapping mapping,
- HttpServletRequest request) {
- // TODO Auto-generated method stub
- return null;
- }
- /**
- * Method reset
- * @param mapping
- * @param request
- */
- public void reset(ActionMapping mapping, HttpServletRequest request) {
- // TODO Auto-generated method stub
- }
- public FormFile getFile1() {
- return file1;
- }
- public void setFile1(FormFile file1) {
- this.file1 = file1;
- }
- }
4.struts-config.xml的清单如下:
- <?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="fileForm" type="form.FileForm" />
- </form-beans>
- <global-exceptions />
- <global-forwards />
- <action-mappings >
- <action
- attribute="fileForm"
- input="/file.jsp"
- name="fileForm"
- path="/file"
- type="action.FileAction"
- validate="false">
- <forward name="success" path="/file.jsp"></forward>
- </action>
- </action-mappings>
- <message-resources parameter="ApplicationResources" />
- </struts-config>
5.web.xml代码清单如下:
- <?xml version="1.0" encoding="UTF-8"?>
- <web-app xmlns="http://java.sun.com/xml/ns/j2ee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" version="2.4" xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee http://java.sun.com/xml/ns/j2ee/web-app_2_4.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>
- </web-app>
三.在struts2中实现(以图片上传为例)
1.FileUpload.jsp代码清单如下:
- <%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
- <%@ taglib prefix="s" uri="/struts-tags" %>
- <html>
- <head>
- <title>The FileUplaodDemo In Struts2</title>
- </head>
- <body>
- <s:form action="fileUpload.action" method="POST" enctype="multipart/form-data">
- <s:file name="myFile" label="MyFile" ></s:file>
- <s:textfield name="caption" label="Caption"></s:textfield>
- <s:submit label="提交"></s:submit>
- </s:form>
- </body>
- </html>
2.ShowUpload.jsp的功能清单如下:
- <%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
- <%@ taglib prefix="s" uri="/struts-tags" %>
- <html>
- <head>
- <title>ShowUpload</title>
- </head>
- <body>
- <div style ="padding: 3px; border: solid 1px #cccccc; text-align: center" >
- <img src ='UploadImages/<s:property value ="imageFileName"/> '/>
- <br />
- <s:property value ="caption"/>
- </div >
- </body>
- </html>
3.FileUploadAction.java的代码清单如下 :
- package com.chris;
- import java.io.*;
- import java.util.Date;
- import org.apache.struts2.ServletActionContext;
- import com.opensymphony.xwork2.ActionSupport;
- public class FileUploadAction extends ActionSupport{
- private static final long serialVersionUID = 572146812454l ;
- private static final int BUFFER_SIZE = 16 * 1024 ;
- //注意,文件上传时<s:file/>同时与myFile,myFileContentType,myFileFileName绑定
- //所以同时要提供myFileContentType,myFileFileName的set方法
- private File myFile; //上传文件
- private String contentType;//上传文件类型
- private String fileName; //上传文件名
- private String imageFileName;
- private String caption;//文件说明,与页面属性绑定
- public void setMyFileContentType(String contentType) {
- System.out.println("contentType : " + contentType);
- this .contentType = contentType;
- }
- public void setMyFileFileName(String fileName) {
- System.out.println("FileName : " + fileName);
- this .fileName = fileName;
- }
- public void setMyFile(File myFile) {
- this .myFile = myFile;
- }
- public String getImageFileName() {
- return imageFileName;
- }
- public String getCaption() {
- return caption;
- }
- public void setCaption(String caption) {
- this .caption = caption;
- }
- private static void copy(File src, File dst) {
- try {
- InputStream in = null ;
- OutputStream out = null ;
- try {
- in = new BufferedInputStream( new FileInputStream(src), BUFFER_SIZE);
- out = new BufferedOutputStream( new FileOutputStream(dst), BUFFER_SIZE);
- byte [] buffer = new byte [BUFFER_SIZE];
- while (in.read(buffer) > 0 ) {
- out.write(buffer);
- }
- } finally {
- if ( null != in) {
- in.close();
- }
- if ( null != out) {
- out.close();
- }
- }
- } catch (Exception e) {
- e.printStackTrace();
- }
- }
- private static String getExtention(String fileName) {
- int pos = fileName.lastIndexOf(".");
- return fileName.substring(pos);
- }
- @Override
- public String execute() {
- imageFileName = new Date().getTime() + getExtention(fileName);
- File imageFile = new File(ServletActionContext.getServletContext().getRealPath("/UploadImages" ) + "/" + imageFileName);
- copy(myFile, imageFile);
- return SUCCESS;
- }
- }
注:此时仅为方便实现Action所以继承ActionSupport,并Overrider execute()方法
在struts2中任何一个POJO都可以作为Action
4.struts.xml清单如下:
- <?xml version="1.0" encoding="UTF-8" ?>
- <!DOCTYPE struts PUBLIC
- "-//Apache Software Foundation//DTD Struts Configuration 2.0//EN"
- "http://struts.apache.org/dtds/struts-2.0.dtd">
- <struts>
- <package name="example" namespace="/" extends="struts-default">
- <action name="fileUpload" class="com.chris.FileUploadAction">
- <interceptor-ref name="fileUploadStack"/>
- <result>/ShowUpload.jsp</result>
- </action>
- </package>
- </struts>
5.web.xml清单如下:
- <?xml version="1.0" encoding="UTF-8"?>
- <web-app version="2.4"
- xmlns="http://java.sun.com/xml/ns/j2ee"
- xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
- xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee
- http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd">
- <filter >
- <filter-name > struts-cleanup </filter-name >
- <filter-class >
- org.apache.struts2.dispatcher.ActionContextCleanUp
- </filter-class >
- </filter >
- <filter-mapping >
- <filter-name > struts-cleanup </filter-name >
- <url-pattern > /* </url-pattern >
- </filter-mapping >
- <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>
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