web/demo/upload/index.jsp

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    <title>文件上传 - Struts2 学习</title>
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            <a href="/">🏠 首页</a> / 文件上传
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            <h1>📁 文件上传</h1>
            
            <h2>1. 单文件上传</h2>
            <div class="section">
                <pre><span class="comment">// Action</span>
<span class="keyword">public class</span> UploadAction <span class="keyword">extends</span> ActionSupport {
    
    <span class="comment">// 文件对象</span>
    <span class="keyword">private</span> File upload;
    
    <span class="comment">// 文件名 (格式: 属性名FileName)</span>
    <span class="keyword">private</span> String uploadFileName;
    
    <span class="comment">// 文件类型 (格式: 属性名ContentType)</span>
    <span class="keyword">private</span> String uploadContentType;
    
    <span class="annotation">@Override</span>
    <span class="keyword">public</span> String execute() <span class="keyword">throws</span> Exception {
        <span class="comment">// 保存文件</span>
        String path = ServletActionContext.getServletContext()
            .getRealPath(<span class="string">"/upload"</span>);
        <span class="keyword">new</span> File(path, uploadFileName).createNewFile();
        
        <span class="comment">// 复制文件</span>
        FileUtils.copyFile(upload, <span class="keyword">new</span> File(path, uploadFileName));
        
        <span class="keyword">return</span> SUCCESS;
    }
    
    <span class="comment">// getter/setter</span>
    <span class="keyword">public</span> File getUpload() { <span class="keyword">return</span> upload; }
    <span class="keyword">public void</span> setUpload(File upload) { <span class="keyword">this</span>.upload = upload; }
    <span class="keyword">public</span> String getUploadFileName() { <span class="keyword">return</span> uploadFileName; }
    <span class="keyword">public void</span> setUploadFileName(String uploadFileName) { <span class="keyword">this</span>.uploadFileName = uploadFileName; }
    <span class="keyword">public</span> String getUploadContentType() { <span class="keyword">return</span> uploadContentType; }
    <span class="keyword">public void</span> setUploadContentType(String uploadContentType) { <span class="keyword">this</span>.uploadContentType = uploadContentType; }
}</pre>
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            <h2>2. JSP 表单</h2>
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                <pre><span class="comment">&lt;%@ taglib prefix="s" uri="/struts-tags" %&gt;</span>
<span class="keyword">&lt;s:form</span> action=<span class="string">"upload"</span> method=<span class="string">"post"</span> enctype=<span class="string">"multipart/form-data"</span><span class="keyword">&gt;</span>
    <span class="keyword">&lt;s:file</span> name=<span class="string">"upload"</span> label=<span class="string">"选择文件"</span>/&gt;
    <span class="keyword">&lt;s:submit</span> value=<span class="string">"上传"</span>/&gt;
<span class="keyword">&lt;/s:form&gt;</span></pre>
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            <h2>3. 多文件上传</h2>
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                <pre><span class="comment">// 使用 List 接收多文件</span>
<span class="keyword">private</span> List&lt;File&gt; uploads;
<span class="keyword">private</span> List&lt;String&gt; uploadsFileName;

<span class="comment">// 表单</span>
<span class="keyword">&lt;s:file</span> name=<span class="string">"uploads"</span> multiple=<span class="string">"multiple"</span>/&gt;</pre>
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            <h2>4. 限制文件大小和类型</h2>
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                <pre><span class="comment">// struts.xml 配置</span>
<span class="keyword">&lt;action</span> name=<span class="string">"upload"</span> class=<span class="string">"com.demo.UploadAction"</span><span class="keyword">&gt;</span>
    <span class="keyword">&lt;interceptor-ref</span> name=<span class="string">"fileUpload"</span><span class="keyword">&gt;</span>
        <span class="keyword">&lt;param</span> name=<span class="string">"maximumSize"</span><span class="keyword">&gt;</span>10485760<span class="keyword">&lt;/param&gt;</span><span class="comment">&lt;!-- 10MB --&gt;</span>
        <span class="keyword">&lt;param</span> name=<span class="string">"allowedTypes"</span><span class="keyword">&gt;</span>image/png,image/jpeg<span class="keyword">&lt;/param&gt;</span>
    <span class="keyword">&lt;/interceptor-ref&gt;</span>
    <span class="keyword">&lt;result&gt;</span>/upload/success.jsp<span class="keyword">&lt;/result&gt;</span>
<span class="keyword">&lt;/action&gt;</span></pre>
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            <a href="/demo/ajax" class="btn">下一节：AJAX →</a>
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