Java中关于Struts图片上传到指定文件夹下并显示图片功能的实例
- 黄舟原创
- 2017-08-10 13:35:591131浏览
这篇文章主要介绍了Java Struts图片上传至指定文件夹并显示图片功能,需要的朋友可以参考下
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
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