aaaa,123 bbbb,123 cccc,123
public class MyAction extends ActionSupport { private String textareaData; // 對應 private List<String> leftValues = new ArrayList<>(); private List<String> rightValues = new ArrayList<>(); public String execute() { if (textareaData == null) return SUCCESS; // 1. 按行分割（兼容 Windows \r\n、Linux \n、Mac \r） String[] lines = textareaData.split("\\r?\\n"); for (String line : lines) { line = line.trim(); if (line.isEmpty()) continue; // 跳過空行 // 2. 按逗號分割 String[] parts = line.split(",", 2); // 限制分割 2 段，防止值含逗號 if (parts.length == 2) { leftValues.add(parts[0].trim()); rightValues.add(parts[1].trim()); } else { // 格式錯誤處理：記錄日誌或設置默認值 leftValues.add(parts[0].trim()); rightValues.add(""); } } return SUCCESS; } // getters/setters... }</code></pre> <h2>關鍵點</h2> <ul> <li><code>split("\\r?\\n")</code> 兼容跨平台換行符。</li> <li><code>split(",", 2)</code> 限制分割段數，避免值中包含逗號導致多段。</li> <li>使用 <code>List<String></code> 而非固定數組，動態適應行數。</li> <li>前端提交前建議 <code>.trim()</code> 去除首尾空白。</li> </ul> <h2>JSP 顯示示例</h2> <pre><code><% 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