Struts Upload File (image)

Last Update:2018-12-07 Source: Internet

Author: User

Tags xslt tld

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Upload files using struts

　　1: Html code

<% @ Page contentType = "text/html; charset = GBK" language = "java" %>

<% @ Taglib uri = "/WEB-INF/struts-html.tld" prefix = "html" %>

<Html>
<Head>
<Title> example of uploading a file </title>
</Head>
<BODY>
<H1> example of uploading a file <Html: errors/> <br>
<Html: form action = "uploadfile. do" enctype = "multipart/form-data">
<Html: file property = "file"/> <br>
<Html: submit> </Html: form>
</BODY>

</Html>

　　Note: The

　　2: sucess. jsp code

Html code

<% @ Page contentType = "text/html; charset = GBK" language = "java" %>
<% @ Taglib uri = "/WEB-INF/struts-html.tld" prefix = "html" %>

<Html>
<H1> upload successful... </Html>

　　3: ActionForm class code: UploadFileForm. java

Java code
// Created by MyEclipse Struts
// XSL source (default): platform:/plugin/com. genuitec. eclipse. cross. easystruts. eclipse_4.0.0/xslt/JavaClass. xsl

Package testfile. forms;

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. action. ActionError;

Import org. apache. struts. upload. FormFile;
Import org. apache. struts. upload. MultipartRequestHandler;

/**
* MyEclipse Struts
* Creation date: 11-14-2005
*
* XDoclet definition:
* @ Struts. form name = "uploadForm"
*/
Public class UploadFileForm extends ActionForm {

Private FormFile file = null;
// Private String fname;
// Private String size;
// Private String url;

Public FormFile getFile (){
Return file;
}
Public void setFile (FormFile file ){
This. file = file;
}
// ************** If the verification file is empty, ***************** is returned *****************
Public ActionErrors validate (
ActionMapping mapping,
HttpServletRequest request ){

ActionErrors errors = new ActionErrors ();

If (file = null | file. getFileSize () <5 | file. getFileName () = null ){
Errors. add ("file", new ActionError ("error. file. null "));
}

Return errors;
}

Public void reset (ActionMapping mapping, HttpServletRequest request ){
}

}

　　4: code in the Action class: UploadFileAction. java

Java code

// Created by MyEclipse Struts
// XSL source (default): platform:/plugin/com. genuitec. eclipse. cross. easystruts. eclipse_4.0.0/xslt/JavaClass. xsl

Package testfile. actions;

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 org. apache. struts. action. ActionErrors;
Import org. apache. struts. action. ActionError;
Import org. apache. struts. upload .*;
Import testfile. forms .*;
Import java. io .*;

/**
* MyEclipse Struts
* Creation date: 11-14-2005
*
* XDoclet definition:
* @ Struts. action validate = "true"
*/
Public class UploadFileAction extends Action {

Public ActionForward execute (
ActionMapping mapping,
ActionForm form,
HttpServletRequest request,
HttpServletResponse response) throws Exception {

ActionErrors errors = new ActionErrors ();

UploadFileForm hff = (UploadFileForm) form;
FormFile file = hff. getFile ();

// ************* If the ActionForm is not verified, add this section *****************
// If (file = null | file. getFileSize () <10 | file. getFileName () = null ){
// Errors. add ("file", new ActionError ("error. file. null "));
// SaveErrors (request, errors );
// Return (new ActionForward (mapping. getInput ()));
//}

// ************* Obtain the information of the uploaded file ****************
String dir = servlet. getServletContext (). getRealPath ("/upload ");
String fname = file. getFileName ();
String size = Integer. toString (file. getFileSize () + "bytes ";
String url = dir + "\" + fname;

*******************
String fileType = (fname. substring (fname. lastIndexOf ('.') + 1). toLowerCase ();
If ((! FileType. equals ("jpg "))&&(! FileType. equals ("bmp "))&&(! FileType. equals ("gif "))&&(! FileType. equals ("jpeg "))){
Errors. add ("filetype", new ActionError ("error. file. type "));
SaveErrors (request, errors );
Return (new ActionForward (mapping. getInput ()));
}

// ************* The file cannot exceed 2 MB ******************
If (file. getFileSize () & gt; 2097152 ){
Errors. add ("size", new ActionError ("error. file. size "));
SaveErrors (request, errors );
Return (new ActionForward (mapping. getInput ()));
}

*****************
InputStream streamIn = file. getInputStream ();
OutputStream streamOut = new FileOutputStream (url );

// ************* Output the file to the target file *****************
Int bytesRead = 0;
Byte [] buffer = new byte [8192];
While (bytesRead = streamIn. read (buffer, 0,8192 ))! =-1 ){
StreamOut. write (buffer, 0, bytesRead );
}

StreamOut. close ();
StreamIn. close ();
File. destroy ();

Return mapping. findForward ("sucess ");
}

}

　　5: properties file content:

Xml Code

Error. file. size = The file is too large, the size must less than 2 M!
Error. file. null = Please choose the file!
Error. file. type = Type of the file must be ". jpg" or ". jpeg" or ". bmp" or ". gif "!

　　6: struts-config.xml code

<? Xml version = "1.0" encoding = "UTF-8"?>
<! DOCTYPE struts-config PUBLIC "-// Apache Software Foundation // DTD Struts Configuration 1.1 // EN"

Http://jakarta.apache.org/struts/dtds/struts-config_1_1.dtd>

<Struts-config>

<Form-beans>
<Form-bean name = "uploadForm" type = "testfile. forms. UploadFileForm"/>

</Form-beans>
<Global-forwards>
<Forward name = "sucess" path = "/sucess. jsp"/>
<Forward name = "index" path = "/uploadfile. jsp"/>
</Global-forwards>
<Action-mappings>
<Action path = "/uploadfile"
Name = "uploadForm"
Scope = "request"
Input = "/uploadfile. jsp"
Type = "testfile. actions. UploadFileAction"/>

</Action-mappings>

<Message-resources parameter = "com. yourcompany. struts. ApplicationResources"/>
</Struts-config>

　　7: web. xml Code

Xml Code

<? Xml version = "1.0" encoding = "UTF-8"?>
<! DOCTYPE web-app PUBLIC "-// Sun Microsystems, Inc. // DTD Web Application 2.3 //" http://java.sun.com/dtd/web-app_2_3.dtd ">

<Web-app>
<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>

<Welcome-file-list>
<Welcome-file> uploadfile. jsp </welcome-file>
</Welcome-file-list>

<Taglib>
<Taglib-uri>/WEB-INF/struts-html.tld </taglib-uri>
<Taglib-location>/WEB-INF/struts-html.tld </taglib-location>
</Taglib>
</Web-app>

This article is an English version of an article which is originally in the Chinese language on aliyun.com and is provided for information purposes only. This website makes no representation or warranty of any kind, either expressed or implied, as to the accuracy, completeness ownership or reliability of the article or any translations thereof. If you have any concerns or complaints relating to the article, please send an email, providing a detailed description of the concern or complaint, to info-contact@alibabacloud.com. A staff member will contact you within 5 working days. Once verified, infringing content will be removed immediately.

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