struts2下传(图片带js预览) _JavaScript

struts2上传(图片带js预览)
jsp页面：
<%@ page language="java" contentType="text/html; charset=GBK"
    pageEncoding="GBK"%>
<%@ taglib prefix="s" uri="/struts-tags" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=GBK">
<title>Insert title here</title>
</head>
<script type="text/javascript">
// 显示图片的js
function viewimg(){
var imgup=document.getElementById("uploadimg");
var imgpath=getPath(imgup);
//判断是否是图片格式
var imgname=imgup.value.substring(imgup.value.lastIndexOf("."),imgup.value.length)
imgname=imgname.toLowerCase()
if ((imgname!='.jpg')&&(imgname!='.gif')&&(imgname!='.jpeg')&&(imgname!='.png')&&(imgname!='.bmp')){
alert("请选择图片文件，谢谢!");
imgup.focus();
//清空file里面的值
imgup.select();
document.selection.clear();

}
else{
//显示图片
document.getElementById("sig_preview").innerHTML="<img src='"+imgpath+"' border=0 width=100 height=60>"
}
}
//该函数解决iE下路径问题。兼容ie6，7，firefox add by exceljava 2010-1-6
function getPath(obj){
   if(obj){
   if (window.navigator.userAgent.indexOf("MSIE")>=1){
     obj.select();
     return document.selection.createRange().text;
   }else if(window.navigator.userAgent.indexOf("Firefox")>=1){
     if(obj.files){
         return obj.files.item(0).getAsDataURL();
     }
     return obj.value;
   }
   return obj.value;
   }
}

</script>
<body>
<s:form action ="fileUpload" namespace="/fileUploadDemo" method ="POST" enctype ="multipart/form-data">
<s:file id="uploadimg" size="40" name="upload" onchange="viewimg()"></s:file>
    <s:submit />
</s:form>


<div id="sig_preview"></div>
</body>
</html>

action代码：
package UploadImages;

import java.io.File;

import javax.servlet.ServletContext;

import org.apache.commons.io.FileUtils;
import org.apache.struts2.util.ServletContextAware;

import com.opensymphony.xwork2.ActionSupport;

public class FileUploadAction extends ActionSupport implements
        ServletContextAware {

    private File upload;// 实际上传文件

    private String uploadContentType; // 文件的内容类型

    private String uploadFileName; // 上传文件名

    private String fileCaption;// 上传文件时的备注

    private ServletContext context;

    public String execute() throws Exception {

        try {

            String targetDirectory = context.getRealPath("/UploadImages");
            String targetFileName = uploadFileName;
            File target = new File(targetDirectory, targetFileName);
            FileUtils.copyFile(upload, target);
       } catch (Exception e) {

            addActionError(e.getMessage());

            return INPUT;
        }

        return SUCCESS;

    }

    public String getFileCaption() {
        return fileCaption;
    }

    public void setFileCaption(String fileCaption) {
        this.fileCaption = fileCaption;
    }

    public File getUpload() {
        return upload;
    }

    public void setUpload(File upload) {
        this.upload = upload;
    }

    public String getUploadContentType() {
        return uploadContentType;
    }

    public void setUploadContentType(String uploadContentType) {
        this.uploadContentType = uploadContentType;
    }

    public String getUploadFileName() {
        return uploadFileName;
    }

    public void setUploadFileName(String uploadFileName) {
        this.uploadFileName = uploadFileName;
    }

    public void setServletContext(ServletContext context) {
        this.context = context;
    }

}
上传后显示页面：
<%@page contentType = "text/html;charset=GBK" pageEncoding = "GBK" %>
<%@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; border: solid 1px #cccccc; text-align: center">
        <img src ='/UploadImages/<s:property value ="uploadFileName" /> '/>
        <br/>
        <s:property value ="caption"/>
    </div>
</body>
</html>
struts配置文件：
<package name ="fileUploadDemo" extends ="struts-default" namespace="/fileUploadDemo">
        <action name ="fileUpload" class ="UploadImages.FileUploadAction">
            <interceptor-ref name ="fileUpload">
            <param name ="allowedTypes" >
                    image/bmp,image/png,image/gif,image/jpeg
                </param >
            </interceptor-ref>
            <interceptor-ref name ="defaultStack" />
            <result name ="success">/fileUploadDemo/showUpload.jsp</result>
        </action>
    </package>

1 楼 jjd020308 2010-06-18

你好，这个要调用别的jar文件吗？