总的说图片上传有两种方式,一种是把图片文件写到数据库中,另一种是存到服务器文件目录中。写到数据库中的图片文件需要转换成二进制流的格式,占用数据库空间比较,适合少量图片的存储,比如说,系统中某些小图标,写到数据库中的优点是比较安全,不容易被用户不小心删除。
在struts2中实现(以图片上传为例)
1.FileUpload.jsp代码清单如下:
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<%@ 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" method= "post" enctype= "multipart/form-data" namespace= "/" > <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:
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<%@ 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 :
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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( "文件类型 : " + contentType); this .contentType = contentType; } public void setMyFileFileName(String fileName) { System.out.println( "文件名称 : " + 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:
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<?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:
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<?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> |
以上内容是小编给大家介绍的Java struts2中如何实现图片上传的全部内容,希望大家喜欢。