前端用 `` 嵌入頁面，Action 查詢數據後需在 iframe 內顯示結果，而非整頁跳轉。</p> <h2>解決方案</h2> <h3>方案一：AJAX 回調（推薦）</h3> <pre><code>// 前端 jQuery $.post("queryAction", params, function(data) { // data 為 JSON 或 HTML 片段 $("#iframeContainer").html(data); // 或填充表格 });</code></pre> <p>Action 返回 JSON/String，不配置 `<result>` 跳轉。</p> <h3>方案二：Action 返回 void 直接寫響應</h3> <pre><code>public void query(HttpServletResponse response) throws IOException { List<Item> list = service.query(); response.setContentType("application/json;charset=UTF-8"); response.getWriter().write(JSON.toJSONString(list)); }</code></pre> <p>struts.xml 不配置該 action 的 `<result>`。</p> <h3>方案三：iframe 表單提交（舊式）</h3> <pre><code><form action="queryAction" target="myIframe" method="post"> <input name="param" /> <button type="submit">查詢</button> </form> <iframe name="myIframe" src="about:blank"></iframe></code></pre> <p>Action 正常返回 JSP 頁面，瀏覽器自動在 iframe 中渲染。</p> <h2>建議</h2> <ul> <li>現代項目優先 **AJAX + 前端渲染**，解耦前後端。</li> <li>若必須用 iframe，方案三最簡單，無需修改後端。</li> </ul> <div 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