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上传文件的jsp文件代码，uploadfile.jsp

炽凤亮尧 2023-04-27 阅读 41
JSPStrutsApacheServletMyeclipsePython后端开发


正在学习struts这个框架，目前正在利用这个框架开发一个小型的Blog Web，其中涉及到上传图片文件，所以写了个例子demo，欢迎指点。

1.上传文件的jsp文件代码：uploadfile.jsp

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

<html>
<head>
<title>一个上传文件的例子</title>
</head>
<BODY>
<h1>一个上传文件的例子</h1>
<html:errors/><br>
<html:form action="uploadfile.do" enctype="multipart/form-data">
    <html:file property="file" /><br><br>
    <html:submit></html:submit>
</html:form>
</BODY>

</html>

 2.sucess.jsp代码：

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

<html>
<h1>上传成功...</h1><html:link forward="index">返回</html:link>
</html>

 3.ActionForm类代码：UploadFileForm.java

//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;
}
//**************验证文件如果为空则返回*****************
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.Action类中的代码：UploadFileAction.java

//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();


    //*************如果ActionForm中没验证则加上这段*****************
    //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()));
    //}

          //*************取得上传文件的信息****************
    String dir=servlet.getServletContext().getRealPath("/upload");
    String fname=file.getFileName();
    String size=Integer.toString(file.getFileSize())+"bytes";
    String url=dir+"\\"+fname;

    //*************限制非图片文件的上传*******************
    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()));
    }

    //*************限制文件不能超过2M******************
    if(file.getFileSize()>2097152){
     errors.add("size",new ActionError("error.file.size"));
     saveErrors(request,errors);
     return (new ActionForward(mapping.getInput()));
    } 
   
    //*************要用到的输入输出流*****************
    InputStream streamIn=file.getInputStream();
    OutputStream streamOut=new FileOutputStream(url);

    //*************将文件输出到目标文件*****************
    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文件内容：


error.file.size=The file is too large,the size must less than 2M !

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代码：

<?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代码：


<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE web-app PUBLIC "-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN" "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>


 
完毕。

 

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