feat(interactive): enhance struts learning pages with task cards and quick experiments

2026-03-09 23:57:50 +08:00
commit 0bbfdd1d7a
14 changed files with 941 additions and 0 deletions
--- a/src/main/java/com/example/struts2/CalculatorAction.java
+++ b/src/main/java/com/example/struts2/CalculatorAction.java
@@ -0,0 +1,77 @@
+package com.example.struts2;
+
+import com.opensymphony.xwork2.ActionSupport;
+
+/**
+ * 计算器 Action - 表单处理示例
+ * 
+ * 学习点：
+ * - Action 接收表单参数（通过 setter）
+ * - 数据验证（validate 方法）
+ * - 结果类型
+ */
+public class CalculatorAction extends ActionSupport {
+    
+    private Double num1;
+    private Double num2;
+    private String operator;
+    private Double result;
+    
+    // 默认执行方法
+    public String execute() {
+        return SUCCESS;
+    }
+    
+    // 计算方法
+    public String calculate() {
+        if (num1 == null || num2 == null || operator == null) {
+            return INPUT;
+        }
+        
+        switch (operator) {
+            case "+":
+                result = num1 + num2;
+                break;
+            case "-":
+                result = num1 - num2;
+                break;
+            case "*":
+                result = num1 * num2;
+                break;
+            case "/":
+                if (num2 == 0) {
+                    addFieldError("num2", "除数不能为0");
+                    return INPUT;
+                }
+                result = num1 / num2;
+                break;
+            default:
+                return INPUT;
+        }
+        return SUCCESS;
+    }
+    
+    // 验证方法
+    @Override
+    public void validate() {
+        if (num1 == null) {
+            addFieldError("num1", "请输入第一个数字");
+        }
+        if (num2 == null) {
+            addFieldError("num2", "请输入第二个数字");
+        }
+    }
+    
+    // Getter and Setter（Struts2 通过这些接收参数）
+    public Double getNum1() { return num1; }
+    public void setNum1(Double num1) { this.num1 = num1; }
+    
+    public Double getNum2() { return num2; }
+    public void setNum2(Double num2) { this.num2 = num2; }
+    
+    public String getOperator() { return operator; }
+    public void setOperator(String operator) { this.operator = operator; }
+    
+    public Double getResult() { return result; }
+    public void setResult(Double result) { this.result = result; }
+}