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