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fileLoad.jsp

代码如下:

<%@ taglib uri="/WEB-INF/struts-logic.tld" prefix="logic" %>
<%@ taglib uri="/WEB-INF/struts-bean.tld" prefix="bean" %>
<%@ taglib uri="/WEB-INF/struts-html.tld" prefix="html" %>
<%@ page contentType="text/html; charset=GBK" %>
<html:html>
<head>
<title>
fileLoad.jsp
</title>
</head>
<body>
<h1>JBuilder Generated Struts JSP for ActionForm forms.LoadForm</h1>
<p>
<html:form action="/loadAction.do" method="POST" enctype="multipart/form-data">
<html:file property="file"/><br />//对应于ActionFrom的FormFile file属性。

<html:submit property="submit" value="Submit"/>
<html:reset value ="Reset"/>
</html:form>
<p>
<logic:notEmpty name="loadForm" property="fname">
  name:<bean:write name="loadForm" property="fname"/>
  size:<bean:write name="loadForm" property="size"/>
</logic:notEmpty>
</p>
</body>
</html:html>
LoadForm的代码:

package forms;

import org.apache.struts.action.ActionForm;
import org.apache.struts.upload.FormFile;
import org.apache.struts.action.ActionErrors;
import org.apache.struts.action.ActionMapping;
import javax.servlet.http.HttpServletRequest;

public class LoadForm extends ActionForm {
    private FormFile file;
    private String fname;
    private String size;
    public FormFile getFile() {
        return file;
    }

    public void setFile(FormFile file) {
        this.file = file;
    }

    public void setSize(String size) {
        this.size = size;
    }

    public void setFname(String fname) {
        this.fname = fname;
    }

    public String getFname() {
        return fname;
    }

    public String getSize() {
        return size;
    }

    public ActionErrors validate(ActionMapping actionMapping,
                                 HttpServletRequest httpServletRequest) {
            /** @todo: finish this method, this is just the skeleton.*/
        return null;
    }

    public void reset(ActionMapping actionMapping,
                      HttpServletRequest servletRequest) {
    }
}
LoginAction代码如下:

package actions;

import org.apache.struts.action.ActionMapping;
import org.apache.struts.action.ActionForm;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.apache.struts.action.ActionForward;
import forms.LoadForm;
import org.apache.struts.action.Action;
import org.apache.struts.upload.FormFile;
import java.io.*;
public class LoadAction extends Action {
    public ActionForward execute(ActionMapping actionMapping,
                                 ActionForm actionForm,
                                 HttpServletRequest servletRequest,
                                 HttpServletResponse servletResponse)throws Exception {
        LoadForm loadForm = (LoadForm) actionForm;
       FormFile ff=loadForm.getFile();
       if(ff==null)
       {
           return actionMapping.findForward("success");
       }
       String fname=ff.getFileName();
       String size=Integer.toString(ff.getFileSize())+"bytes";
       InputStream in=ff.getInputStream();
       OutputStream out=new FileOutputStream("/"+fname);
       int bytesRead=0;
       byte[] buffer=new byte[8192];
       while((bytesRead=in.read(buffer,0,8192))!=-1)
       {
           out.write(buffer,0,bytesRead);
       }
       out.close();
       in.close();
      loadForm.setFname(fname);
      loadForm.setSize(size);
      ff.destroy();
      return actionMapping.findForward("success");
      }
}

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="loadForm" type="forms.LoadForm" />
  </form-beans>
  <action-mappings>
    <action name="loadForm" path="/loadAction" scope="request" type="actions.LoadAction" input="/fileLoad.jsp">
<forward name="success" path="/fileLoad.jsp">
</forward>
</action>  </action-mappings>
</struts-config>

说明:<html:file>标签可以方便的实现文件上传功能。

有以下几点需要注意:

1: <html:file>必须嵌套在<html:form>标签中。

2:<html:form>标签的method的属性必须设为"post".

3:<html:form>标签的编码类型enctype属性必须为"multipart/form-data"。

4:<html:file>标签必须设为property属性,这个属性和ActionForm Bean中FormFile类型的属性对应。

posted on 2006-08-17 18:56 SIMONE 阅读(264) 评论(0)  编辑  收藏

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