Struts2 上传文件实例
2008-01-14 10:09
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实现原理
Struts 2是通过Commons FileUpload文件上传。Commons FileUpload通过将HTTP的数据保存到临时文件夹，然后Struts使用fileUpload拦截器将文件绑定到Action的实例中。从而我们就能够以本地文件方式的操作浏览器上传的文件。具体实现
前段时间Apache发布了Struts 2.0.6 GA，所以本文的实现是以该版本的Struts作为框架的。以下是例子所依赖类包的列表：
目录结构：
创建文件上传页面FileUpload.jsp
<%...@ page language="java" contentType="text/html;charset=UTF-8" pageEncoding="UTF-8"%>
<%...@ taglib prefix="s" uri="/struts-tags"%>
<! DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd" >
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title>Struts 2 File Upload</title>
</head>
<body>
<s:fielderror />
<div>
<p><b>Single file upload</b></p>
<s:form action="fileUpload" method="POST" enctype="multipart/form-data">
<s:file name="myFile" label="Image File"/>
<s:textfield name="caption" label="Caption" />
<s:submit/>
</s:form>
</div>
<div>
<p><b>Multiple files upload</b></p>
<s:form action="multiplefileUpload" method="POST" enctype="multipart/form-data">
<s:file label ="File(1)" name ="uploads"/>
<s:file label ="File(2)" name ="uploads"/>
<s:file label ="FIle(3)" name ="uploads"/>
<s:file label ="FIle(4)" name ="uploads"/>
<s:textfield name="caption" label="Caption" />
<s:submit/>
</s:form>
</div>
</body>
</html>
创建FileUploadAction.java
package fileupload;
import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.ArrayList;
import java.util.Date;
import java.util.List;
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 = 64 * 1024;
private File myFile;
private String contentType;
private String fileName;
private String imageFileName;
private String caption;
private File[] uploads;
private String[] uploadFileNames;
private String[] uploadContentTypes;
private List imageFileNames = new ArrayList() ;
public void setMyFileContentType(String contentType) ...{
this.contentType = contentType;
}
public void setMyFileFileName(String fileName) ...{
this.fileName = fileName;
}
public void setMyFile(File myFile) ...{
System.out.println("this is setMyFile[]");
this.myFile = myFile;
}
public String getImageFileName() ...{
return imageFileName;
}
public String getCaption() ...{
return caption;
}
public void setCaption(String caption) ...{
this.caption = caption;
}
public File[] getUploads() ...{
return this.uploads;
}
public void setUploads(File[] upload) ...{
this.uploads = upload;
}
public String[] getUploadsFileName() ...{
return this.uploadFileNames;
}
public void setUploadsFileName(String[] uploadFileName) ...{
this.uploadFileNames = uploadFileName;
}
public String[] getUploadsContentType() ...{
return this.uploadContentTypes;
}
public void setUploadsContentType(String[] uploadContentType) ...{
this.uploadContentTypes = uploadContentType;
}
public List getImageFileNames() ...{
return imageFileNames;
}
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);
}
public String execute() ...{
if (this.fileName != null) ...{
imageFileName = new Date().getTime() + getExtention(fileName);
File imageFile = new File(ServletActionContext.getServletContext()
.getRealPath("/upload/UploadImages")
+ "/" + imageFileName);
copy(myFile, imageFile);
return SUCCESS;
} else ...{
for (int i = 0; i < this.uploads.length; i++) ...{
System.out.println(this.uploadFileNames[i]);
imageFileName = new Date().getTime() + i + getExtention(this.uploadFileNames[i]);
imageFileNames.add(imageFileName);
File imageFile = new File(ServletActionContext.getServletContext().getRealPath("/upload/UploadImages")+ "/" + imageFileName);
copy(this.uploads[i], imageFile);
}
return SUCCESS;
}
}
}
上传成功的页面：
ShowUpload.jsp
<%...@ page language="java" contentType="text/html;charset=UTF-8"
pageEncoding="UTF-8"%>
<%...@ taglib prefix="s" uri="/struts-tags"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd" >
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title>Struts 2 File Upload</title>
</head>
<body>
<div style="padding:3px;width=100px">
<fieldset>
<legend>UploadImage: <b> <s:property value="caption"/></b></legend>
<img src='UploadImages/<s:property value ="imageFileName"/>'/>
</fieldset>
</div>
</body>
</html>
ShowMultipleUpload.jsp
<%...@ page language="java" contentType="text/html;charset=UTF-8"
pageEncoding="UTF-8"%>
<%...@ taglib prefix="s" uri="/struts-tags"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd" >
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title>Struts 2 File Upload</title>
</head>
<body>
<div style="padding:3px;width=100px">
<fieldset>
<legend>UploadImage: <b> <s:property value="caption"/></b></legend>
<s:iterator value="imageFileNames">
<img src='UploadImages/<s:property />'/>
</s:iterator>
</fieldset>
</div>
</body>
</html>
Action的配置文件：
<package name ="fileUploadDemo" extends ="struts-default" namespace="/upload">
<action name ="fileUpload" class ="fileupload.FileUploadAction">
<interceptor-ref name ="fileUpload">
<param name ="allowedTypes">image/bmp,image/png,image/gif,image/jpeg</param>
</interceptor-ref>
<interceptor-ref name ="fileUploadStack"/>
<result name ="input">FileUpload.jsp </result>
<result name ="success">ShowUpload.jsp</result>
</action>
<action name ="multiplefileUpload" class ="fileupload.FileUploadAction">
<result name ="input">FileUpload.jsp </result>
<result name ="success">ShowMultipleUpload.jsp</result>
</action>
</package>
web.xml配置文件：
<? xml version="1.0" encoding="UTF-8" ?>
< web-app id ="WebApp_9" 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" >
< display-name > Struts 2 Fileupload </ display-name >
< filter >
< filter-name > struts-cleanup </ filter-name >
< filter-class >
org.apache.struts2.dispatcher.ActionContextCleanUp
</ filter-class >
</ filter >
< filter >
< filter-name > struts2 </ filter-name >
< filter-class >
org.apache.struts2.dispatcher.FilterDispatcher
</ filter-class >
</ filter >
< filter-mapping >
< filter-name > struts-cleanup </ filter-name >
< url-pattern > /* </ url-pattern >
</ filter-mapping >
< filter-mapping >
< filter-name > struts2 </ filter-name >
< url-pattern > /* </ url-pattern >
</ filter-mapping >
< welcome-file-list >
< welcome-file > index.html </ welcome-file >
</ welcome-file-list >
</ web-app >
运行结果：
地址：http://localhost:8080/s2/upload/FileUpload.jsp
Single file upload Result
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