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Java Struts图片上传至指定文件夹并显示图片功能

程序员文章站 2024-02-14 17:31:58
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