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Java框架Struts2实现图片上传 Java框架Struts2实现图片上传功能

yzj_xiaoyue 人气:0

Struts 2 框架为处理文件上传提供了内置支持,它使用“在 HTML 中基于表单的文件上传”。当上传一个文件时,它通常会被存储在一个临时目录中,而且它们应该由 Action 类进行处理或移动到一个永久的目录,用来确保数据不丢失。服务器在恰当的位置可能有一个安全策略,它会禁止你写到除了临时目录以外的目录,而且这个目录属于你的web应用应用程序。

通过预定义的名为文件上传的拦截器,Struts 的文件上传是可能的,这个拦截器在 org.apache.struts2.interceptor.FileUploadInterceptor 类是可用的,而且是 defaultStack 的一部分。

创建视图文件

让我们开始创建需要浏览和上传选定的文件的视图。因此,让我们创建一个带有简单的 HTML 上传表单的 index.jsp,它允许用户上传文件:(表单的编码类型设置为multipart/form-data)

<%--
 Created by IntelliJ IDEA.
 User: yzjxiaoyue
 Date: 2017/7/28
 Time: 19:11
 To change this template use File | Settings | File Templates.
--%>
<%@ page language="java" contentType="text/html; charset=utf-8"
     pageEncoding="utf-8"%>
<%@ 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>
  <title>File Upload</title>
</head>
<body>
<form action="upload" method="post" enctype="multipart/form-data">
  <label for="myFile">Upload your file</label>
  <input type="file" name="myFile" id="myFile"/>
  <input type="submit" value="Upload"/>
</form>
</body>
</html>

之后创建success.jsp页面:

<%--
 Created by IntelliJ IDEA.
 User: yzjxiaoyue
 Date: 2017/7/28
 Time: 19:14
 To change this template use File | Settings | File Templates.
--%>
<%@ page contentType="text/html; charset=UTF-8" %>
<%@ taglib prefix="s" uri="/struts-tags" %>
<html>
<head>
  <title>File Upload Success</title>
</head>
<body>
You have successfully uploaded <s:property value="myFileFileName"/>
</body>
</html>

创建error.jsp页面

<%--
 Created by IntelliJ IDEA.
 User: yzjxiaoyue
 Date: 2017/7/28
 Time: 20:05
 To change this template use File | Settings | File Templates.
--%>
<%@ page contentType="text/html; charset=UTF-8" %>
<%@ taglib prefix="s" uri="/struts-tags" %>
<html>
<head>
  <title>File Upload Error</title>
</head>
<body>
There has been an error in uploading the file.
</body>
</html>

创建 action 类

接下来让我们创建一个称为 uploadFile.java 的 Java 类,它负责上传文件,并且把这个文件存储在一个安全的位置:

package com.action;
 
import com.opensymphony.xwork2.ActionSupport;
import org.apache.commons.io.FileUtils;
 
import java.io.File;
import java.io.IOException;
public class uploadFile extends ActionSupport{
  private File myFile;
 
  public File getMyFile() {
    return myFile;
  }
  public void setMyFile(File myFile) {
    this.myFile = myFile;
  }
 
  private String myFileContentType;
 
  private String myFileFileName;
 
  private String destPath;
 
  public String execute()
  {
     /* Copy file to a safe location */
    destPath = "E:\\Program Files\\apache-tomcat-9.0.0\\apache-tomcat-9.0.0.M22\\work\\";
    try{
      System.out.println("Src File name: " + myFile);
      System.out.println("Dst File name: " + myFileFileName);
      File destFile = new File(destPath, myFileFileName);
      FileUtils.copyFile(myFile, destFile);
    }catch(IOException e){
      e.printStackTrace();
      return ERROR;
    }
    return SUCCESS;
  }
 
 
  public String getMyFileContentType() {
    return myFileContentType;
  }
  public void setMyFileContentType(String myFileContentType) {
    this.myFileContentType = myFileContentType;
  }
  public String getMyFileFileName() {
    return myFileFileName;
  }
  public void setMyFileFileName(String myFileFileName) {
    this.myFileFileName = myFileFileName;
  }
}

配置文件

<?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.devMode" value="true"/>
  <constant name="struts.multipart.maxSize" value="10000000"/>
 
  <constant name="struts.multipart.saveDir" value="/tmp"/>
  <constant name="struts.custom.i18n.resources" value="struts"></constant>
  <package name="default" namespace="/" extends="struts-default">
    <action name="upload" class="com.action.uploadFile">
      <!--<interceptor-ref name="basicStack"/>-->
      <interceptor-ref name="defaultStack"/>
      <interceptor-ref name="fileUpload">
        <param name="allowedTypes">image/jpeg,image/jpg,image/gif</param>
      </interceptor-ref>
      <result name="success">/success.jsp</result>
      <result name="error">/error.jsp</result>
    </action>
  </package>
</struts>

界面截图

以上就是本文的全部内容,希望对大家的学习有所帮助,也希望大家多多支持。

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