1、FruitController

• FruitController已经和Web没有关系了，和Web容器解耦，可以脱离Web容器做单元测试

package com.csdn.fruit.controller;
import com.csdn.fruit.dto.PageInfo;
import com.csdn.fruit.dto.PageQueryParam;
import com.csdn.fruit.dto.Result;
import com.csdn.fruit.pojo.Fruit;
import com.csdn.fruit.service.FruitService;
import com.csdn.mymvc.annotation.*;
@Controller
@RequestMapping("/fruit")
public class FruitController {@Autowireprivate FruitService fruitService;@GetMapping("/index")public Result index(Integer pageNo,String keyword) {if (pageNo == null) {pageNo = 1;}if (keyword == null) {keyword = "";}PageQueryParam pageQueryParam = new PageQueryParam(pageNo, 5, keyword);PageInfo<Fruit> pageInfo = fruitService.getFruitPageInfo(pageQueryParam);return Result.OK(pageInfo);}@PostMapping("/add")public Result add(@RequestBody Fruit fruit)  {fruitService.addFruit(fruit);return Result.OK();}@GetMapping("/del")public Result del(Integer fid){fruitService.delFruit(fid);return Result.OK();}@GetMapping("/edit")public Result edit(Integer fid){Fruit fruit = fruitService.getFruitById(fid);return Result.OK(fruit);}@GetMapping("/getFname")public Result getFname(String fname){ //fname是请求参数Fruit fruit = fruitService.getFruitByFname(fname);return fruit == null ? Result.OK() : Result.Fail();}@PostMapping("/update")public Result update(@RequestBody Fruit fruit){ //fruit是请求体参数fruitService.updateFruit(fruit);return Result.OK();}
}

2、DispatcherServlet

package com.csdn.mymvc.core;
import com.csdn.fruit.dto.Result;
import com.csdn.fruit.util.ResponseUtil;
import jakarta.servlet.RequestDispatcher;
import jakarta.servlet.ServletContext;
import jakarta.servlet.ServletException;
import jakarta.servlet.annotation.WebServlet;
import jakarta.servlet.http.HttpServlet;
import jakarta.servlet.http.HttpServletRequest;
import jakarta.servlet.http.HttpServletResponse;
import org.junit.Test;
import java.io.IOException;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.util.Arrays;
import java.util.Map;
@WebServlet("/*")
public class DispatcherServlet extends HttpServlet {private final String BEAN_FACTORY = "beanFactory";private final String CONTROLLER_BEAN_MAP = "controllerBeanMap";@Testpublic void uri() {String uri = "/fruit/index";String[] arr = uri.split("/");System.out.println(Arrays.toString(arr));//[, fruit, index]}@Overrideprotected void service(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {String[] staticResourceSuffixes = {".html", ".jsp", ".jpg", ".png", ".gif", ".css", ".js", ".ico"};String uri = req.getRequestURI();if (Arrays.stream(staticResourceSuffixes).anyMatch(uri::endsWith)) {RequestDispatcher defaultDispatcher = req.getServletContext().getNamedDispatcher("default");defaultDispatcher.forward(req, resp);} else {String[] arr = uri.split("/");if (arr == null || arr.length != 3) {throw new RuntimeException(uri + "非法！");}//[, fruit, index]String requestMapping = "/" + arr[1];String methodMapping = "/" + arr[2];ServletContext application = getServletContext();ControllerDefinition controllerDefinition = ((Map<String, ControllerDefinition>) application.getAttribute(CONTROLLER_BEAN_MAP)).get(requestMapping);if (controllerDefinition == null) {throw new RuntimeException(requestMapping + "对应的controller组件不存在！");}//获取请求方式，例如：get或者postString requestMethodStr = req.getMethod().toLowerCase();//get_/indexMethod method = controllerDefinition.getMethodMappingMap().get(requestMethodStr + "_" + methodMapping);Object controllerBean = controllerDefinition.getControllerBean();try {//第 1 步：参数处理//第 2 步：方法调用//调用controllerBean对象中的method方法method.setAccessible(true);Object returnObj = method.invoke(controllerBean, req, resp);if (returnObj != null && returnObj instanceof Result) {Result result= (Result) returnObj;ResponseUtil.print(resp,result);}} catch (IllegalAccessException e) {e.printStackTrace();throw new RuntimeException(e);} catch (InvocationTargetException e) {e.printStackTrace();throw new RuntimeException(e);}}}
}