关于struts的<html:file>的详细用法。
有谁能详细解释一下struts的 <html:file> 标签的用法，主要讲一下每个参数的设置。最好带个简单明了的例子。顺便讲解一下 <input type= "file "/> 的参数设置方法。最好全一点。
[解决办法]
调用FormFile
[解决办法]
选择上传文件页面：selfile.jsp
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<%@ taglib uri= "/WEB-INF/struts-html.tld " prefix= "html "%>
<html:html>
<html:form action= "/uploadsAction.do " enctype= "multipart/form-data ">
<html:file property= "theFile "/>
<html:submit/>
</html:form>
</html:html>
--------------------------------------------
UpLoadAction.java
--------------------------------------------
import java.io.*;
import javax.servlet.http.*;
import org.apache.struts.action.*;
import org.apache.struts.upload.FormFile;
/**
* <p> Title:UpLoadAction </p>
* <p> Description: QRRSMMS </p>
* <p> Copyright: Copyright (c) 2004 jiahansoft </p>
* <p> Company: jiahansoft </p>
* @author wanghw
* @version 1.0
*/
public class UpLoadAction extends Action {
public ActionForward execute(ActionMapping mapping,
ActionForm form,
HttpServletRequest request,
HttpServletResponse response)
throws Exception {
if (form instanceof uploadsForm) {//如果form是uploadsForm
String encoding = request.getCharacterEncoding();
if ((encoding != null) && (encoding.equalsIgnoreCase( "utf-8 ")))
{
response.setContentType( "text/html; charset=gb2312 ");//如果没有指定编码，编码格式为gb2312
}
UpLoadForm theForm = (UpLoadForm ) form;
FormFile file = theForm.getTheFile();//取得上传的文件
try {
InputStream stream = file.getInputStream();//把文件读入
String filePath = request.getRealPath( "/ ");//取当前系统路径
ByteArrayOutputStream baos = new ByteArrayOutputStream();
OutputStream bos = new FileOutputStream(filePath + "/ " +
file.getFileName());//建立一个上传文件的输出流
//System.out.println(filePath+ "/ "+file.getFileName());
int bytesRead = 0;
byte[] buffer = new byte[8192];
while ( (bytesRead = stream.read(buffer, 0, 8192)) != -1) {
bos.write(buffer, 0, bytesRead);//将文件写入服务器
}
bos.close();
stream.close();
}catch(Exception e){
System.err.print(e);
}
//request.setAttribute( "dat ",file.getFileName());
return mapping.findForward( "display ");
}
return null;
}
}
--------------------------------------------
UpLoadForm.java
--------------------------------------------
import javax.servlet.http.HttpServletRequest;
import org.apache.struts.action.*;
import org.apache.struts.upload.*;
/**
* <p> Title:UpLoadForm </p>
* <p> Description: QRRSMMS </p>
* <p> Copyright: Copyright (c) 2004 jiahansoft </p>
* <p> Company: jiahansoft </p>
* @author wanghw
* @version 1.0
*/
public class UpLoadForm extends ActionForm {
public static final String ERROR_PROPERTY_MAX_LENGTH_EXCEEDED = "org.apache.struts.webapp.upload.MaxLengthExceeded ";
protected FormFile theFile;
public FormFile getTheFile() {
return theFile;
}
public void setTheFile(FormFile theFile) {
this.theFile = theFile;
}
public ActionErrors validate(ActionMapping mapping, HttpServletRequest request)
{
ActionErrors errors = null;
//has the maximum length been exceeded?
Boolean maxLengthExceeded = (Boolean)
request.getAttribute(MultipartRequestHandler.ATTRIBUTE_MAX_LENGTH_EXCEEDED);
if ((maxLengthExceeded != null) && (maxLengthExceeded.booleanvalue()))
{
errors = new ActionErrors();
errors.add(ERROR_PROPERTY_MAX_LENGTH_EXCEEDED, new ActionError( "maxLengthExceeded "));
}
return errors;
}
}
//这是相对应的form，还有其他属性可以设置，具体可以参考struts的上传例子。
--------------------------------------------
struts-config.xml
--------------------------------------------
<?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= "uploadsForm " type= "UpLoadForm " />
</form-beans>
<action-mappings>
<action name= "uploadsForm " type= "UpLoadAction " path= "/uploadsAction ">
<forward name= "display " path= "/display.jsp " />
</action>
</action-mappings>
</struts-config>
<!--display.jsp就是随便写一个成功页-->
[解决办法]
首先定义控件名： "formFile " <input name= "formFile " type= "file ">
然后，在mapForm类里面定义FormFile属性及其get和set方法。属性名与控件名要相同：
private FormFile formFile;
这样的话：在其他类中就可以直接调了：
File f=mapForm.getFormFile();
================================
多个文件上传可定义多个不同控件名和mapForm的属性。
