jsp\struts1.2\struts2 中文件上传
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:
Java代码
<?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:
Java代码
<%@ 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:
Java代码
/*
* 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:
Java代码
<?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:
Java代码
<%@ 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:
Java代码
<%@ 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 :
Java代码
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:
Java代码
<?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:
Java代码
<?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>