Java Struts图片上传至指定文件夹并显示图片功能
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2024-02-21 13:44:40
继上一次利用servlet实现图片上传，这次利用基于mvc的struts框架，封装了servlet并简化了jsp页面跳转。
jsp上传页面
上传一定要为form加上en...
继上一次利用servlet实现图片上传，这次利用基于mvc的struts框架，封装了servlet并简化了jsp页面跳转。
jsp上传页面
上传一定要为form加上enctype="multipart/form-data"，表示提交的数据时二进制的
并且必须是method="post"
<%@ page language="java" contenttype="text/html; charset=utf-8" pageencoding="utf-8"%> <%@taglib prefix="s" uri="/struts-tags"%> <html> <head> <meta http-equiv="content-type" content="text/html; charset=utf-8"> </head> <body> <s:form action="login" method="post" enctype="multipart/form-data"> <s:file name="img" label="头像" /> <s:submit value="上传" /> </s:form> <!-- <form action="login" method="post" enctype="multipart/form-data"> 头像:<input type="file" name="img"></input> <input type="submit" values="上传"></input> </form> --> </body> </html>
struts.xml配置(maven项目放在resources)
<?xml version="1.0" encoding="utf-8" ?>
<!doctype struts public
"-//apache software foundation//dtd struts configuration 2.3//en"
"http://struts.apache.org/dtds/struts-2.3.dtd">
<struts>
<constant name="struts.multipart.maxsize" value="20480000"/> 设置文件上传最大值
<package name="struts2" extends="struts-default">
<action name="login" class="com.controller.teststruts" method="logintest">
<result name="fail">/fail.jsp</result>
<result name="success">/success.jsp</result>
</action>
</package>
</struts>
teststruts.java控制类
一定要提供三个属性
file img; string imgfilename; string imgcontenttype;
然后为这3个属性提供getter setter方法
package com.controller;
import java.io.file;
import java.io.ioexception;
import java.util.map;
import javax.servlet.http.httpservletrequest;
import javax.servlet.http.httpservletresponse;
import org.apache.commons.io.fileutils;
import org.apache.struts2.servletactioncontext;
import com.opensymphony.xwork2.actioncontext;
import com.opensymphony.xwork2.actionsupport;
public class teststruts extends actionsupport{
private file img;
private string imgfilename;
private string imgcontenttype;
public file getimg(){
return img;
}
public string getimgfilename(){
return imgfilename;
}
public string getimgcontenttype(){
return imgcontenttype;
}
public void setimg(file img){
this.img = img;
}
public void setimgfilename(string imgfilename){
this.imgfilename = imgfilename;
}
public void setimgfilecontenttype(string imgcontenttype){
this.imgcontenttype = imgcontenttype;
}
@suppresswarnings("unchecked")
public string logintest() throws ioexception{
map p = actioncontext.getcontext().getsession();
p.put("imgfilename", imgfilename);
file f = new file("d://imagebystruts");
if (!f.exists()) {
f.mkdir();
}
fileutils.copyfile(img, new file(f, imgfilename));
return "success";
}
}
tomcat中server.xml文件配置虚拟路径
<context docbase="d:/imagebystruts" path="/imagebystruts" reloadable="true"/> <context docbase="sshtest" path="/sshtest" reloadable="true" source="org.eclipse.jst.j2ee.server:sshtest"/></host>
success.jsp显示图片
<%@ page language="java" contenttype="text/html; charset=utf-8"
pageencoding="utf-8"%>
<!doctype html public "-//w3c//dtd html 4.01 transitional//en" "http://www.w3.org/tr/html4/loose.dtd">
<%@ taglib prefix="s" uri="/struts-tags" %>
<html>
<head>
<meta http-equiv="content-type" content="text/html; charset=utf-8">
<title>success</title>
</head>
<body>
<h1>成功</h1>
<body>
<img src="/imagebystruts/${imgfilename}">
</body>
</body>
</html>
总结
以上所述是小编给大家介绍的java struts图片上传至指定文件夹并显示图片功能，希望对大家有所帮助
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