1.将方法的request和response参数封装到参数数组

1.SunDispatcherServlet.java

1.根据方法信息，返回实参列表

    /*** 根据方法信息，返回实参列表** @param request* @param method* @return*/private Object[] resolveMethodArguments(HttpServletRequest request, HttpServletResponse response, Method method) {// 1. 获取方法的参数列表Class<?>[] parameterTypes = method.getParameterTypes();// 2. 获取请求参数列表Object[] args = new Object[parameterTypes.length];// 3. 遍历参数列表，填充实参for (int i = 0; i < parameterTypes.length; i++) {Class<?> parameterType = parameterTypes[i];if (parameterType == HttpServletRequest.class) {args[i] = request;} else if (parameterType == HttpServletResponse.class) {args[i] = response;} else {// 其他参数类型}}return args;}

2.具体调用

2.测试

2.封装Http请求参数到参数数组

1.自定义@RequestParam注解

package com.sunxiansheng.springmvc.annotation;import java.lang.annotation.*;/*** Description: 自定义RequestParam注解* @Author sun* @Create 2024/8/6 16:09* @Version 1.0*/
@Retention(value = RetentionPolicy.RUNTIME) // 运行时生效
@Target(value = ElementType.PARAMETER) // 作用在参数上
@Documented // 生成文档
public @interface RequestParam {String name() default "";}

2.MonsterController.java 增加参数

3.SunDispatcherServlet.java

1.resolveMethodArguments 根据方法信息，返回实参列表

    /*** 根据方法信息，返回实参列表** @param request* @param method* @return*/private Object[] resolveMethodArguments(HttpServletRequest request, HttpServletResponse response, Method method) {// 1. 获取方法的参数列表Class<?>[] parameterTypes = method.getParameterTypes();// 2. 获取请求参数列表Object[] args = new Object[parameterTypes.length];// 3. 遍历参数列表，填充实参for (int i = 0; i < parameterTypes.length; i++) {Class<?> parameterType = parameterTypes[i];if (parameterType == HttpServletRequest.class) {args[i] = request;} else if (parameterType == HttpServletResponse.class) {args[i] = response;} else {// 查看是否有@RequestParam注解if (method.getParameters()[i].isAnnotationPresent(RequestParam.class)) {// 获取参数名String parameterName = method.getParameters()[i].getAnnotation(RequestParam.class).name();// 从请求参数中获取参数值，并填充到实参列表String parameter = request.getParameter(parameterName);args[i] = parameter;} else {// 没有注解，就取得参数名字，作为请求参数名String parameterName = method.getParameters()[i].getName();// 从请求参数中获取参数值，并填充到实参列表String parameter = request.getParameter(parameterName);// 判空if (parameter == null || parameter.isEmpty()) {log.error("参数名匹配失败:{}", parameter);}args[i] = parameter;}}}// 遍历实参列表统计参数个数int count = 0;for (Object arg : args) {if (arg != null) {count++;}}// 与参数列表长度比较，如果不相等，就返回nullif (count != parameterTypes.length) {throw new RuntimeException("参数个数不匹配");}return args;}

2.测试