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Struts2-文件上传-<s:file>标签使用

2017-07-11 17:44 447 查看

-开发环境：IDE:
Intellij IDEA 2017tomcat:9.0os:archlinuxjdk:1.8.0._131
-
新建FileUploadDemo工程

勾选struts2选项

创建完后工程目录如下：

新建包com.action,在包下新建FileUploadAction.java类，内容如下

package com.action;

import com.opensymphony.xwork2.ActionSupport;

import java.io.File;

/**
* Created by sky on 7/11/17.
*/
public class FileUploadAction extends ActionSupport {
private File uploadFile;//对应index.jsp里的<s:file>标签里的name的值　　不一样无法获取
private String uploadFileFileName;
private String uploadFileContentType;

public void setUploadFile(File uploadFile) {
this.uploadFile = uploadFile;
}

public void setUploadFileFileName(String uploadFileFileName) {
this.uploadFileFileName = uploadFileFileName;
}

public void setUploadFileContentType(String uploadFileContentType) {
this.uploadFileContentType = uploadFileContentType;
}

public File getUploadFile() {
return uploadFile;
}

public String getUploadFileFileName() {
return uploadFileFileName;
}

public String getUploadFileContentType() {
return uploadFileContentType;
}

@Override
public String execute() throws Exception {
if(uploadFile!=null){
String dataDir="/home/sky/";
File saveFile=new File(dataDir,uploadFileFileName);
uploadFile.renameTo(saveFile);
}
else {
return INPUT;
}
return SUCCESS;
}
}

编辑struts.xml,内容如下：

<?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>
<package name="Struts2_AJAX_DEMO" namespace="/" extends="struts-default">
<action name="fileupload" class="com.action.FileUploadAction">
<result>/success.jsp</result>
<interceptor-ref name="defaultStack">

<param name="fileUpload.allowedTypes">image/jpg,image/jpeg,image/png</param>
</interceptor-ref>
</action>
</package>
</struts>

WEB-INF 目录下　web.xml　内容如下：

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns="http://xmlns.jcp.org/xml/ns/javaee"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd" version="3.1">
<filter>
<filter-name>struts2</filter-name>
<filter-class>org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter</filter-class>
</filter>
<filter-mapping>
<filter-name>struts2</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>
</web-app>

web目录下新建index.jsp和sucess.jsp
index.jsp内容如下:

<%--
Created by IntelliJ IDEA.
User: sky
Date: 7/11/17
Time: 4:18 PM
To change this template use File | Settings | File Templates.
--%>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<%@ taglib prefix="s" uri="/struts-tags" %>
<html>
<head>
<title>$Title$</title>
</head>
<body>
<center>
<s:form action="fileupload" enctype="multipart/form-data" method="POST">
<s:file name="uploadFile" label="选择文件"/>
<s:submit/>
</s:form>
</center>
</body>
</html>

sucess.jsp内容如下:
<%@ taglib prefix="s" uri="/struts-tags" %>
<%--
Created by IntelliJ IDEA.
User: sky
Date: 7/11/17
Time: 5:13 PM
To change this template use File | Settings | File Templates.
--%>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
<title>Title</title>

</head>
<body>
<center>
<h2>
文件名:<s:property value="uploadFileFileName"/><br/>
文件类型:<s:property value="uploadFileContentType"/>
</h2>
</center>
</body>
</html>
调试运行

注意：<s:file>标签里的name属性值务必跟　FileUploadAction类里的　private File xxx一样，例如：<s:file>里的name=pic,<s:file name="pic"> 对应FileUploadAction类里的 private File　　必须为pic,其他２个属性文件名和文件类型　则为picFileName和picContentType，本例中名为uploadFile。所以　<s:file name="uploadFile">

FileUploadAction类里3个字段名为　uploadFile　uploadFileFileName uploadFileContentType。

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