这篇文章主要介绍了Java struts2中如何实现图片上传的相关资料,需要的朋友可以参考下
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。
1.FileUpload.jsp代码清单如下:
The FileUplaodDemo In Struts2
2.ShowUpload.jsp的功能清单如下:
ShowUpload "/>
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:
/ShowUpload.jsp
5.web.xml清单如下:
struts-cleanup org.apache.struts2.dispatcher.ActionContextCleanUp struts-cleanup /* struts2org.apache.struts2.dispatcher.Filterdispatcherstruts2/*Index.jsp
