一起写框架-MVC框架-基础功能-DispacherServlet控制器的实现(三)

 1 package org.webmvc.cofig; 2 ?3 import ioc.core.annotation.ComponentScan; 4 import ioc.core.annotation.Configuration; 5 ?6 //使用定义@Configuration定义该类是一个配置类 7 @Configuration 8 //使用ComponentScan设置扫描包的路径 9 @ComponentScan(basePackages={"org.webmvc.controller"})10 public class IocConfig {11 12 }

 1 <?xml version="1.0" encoding="UTF-8"?> 2 <web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd" id="WebApp_ID" version="3.0"> 3 ??<display-name>webmvc-demo-test-01</display-name> 4 ???<servlet> 5 ?????<servlet-name>dispacherServlet</servlet-name> 6 ?????<servlet-class>ioc.webmvc.DispacherServlet</servlet-class> 7 ?????<init-param> 8 ???????<!-- 设置配置类的类全名 --> 9 ???????<param-name>cofig</param-name>10 ???????<param-value>org.webmvc.cofig.IocConfig</param-value>11 ?????</init-param>12 ???</servlet>13 ???<servlet-mapping>14 ?????<servlet-name>dispacherServlet</servlet-name>15 ?????<url-pattern>*.do</url-pattern>16 ???</servlet-mapping>17 </web-app>

 1 package org.webmvc.controller; 2 ?3 import ioc.core.annotation.stereotype.Controller; 4 ?5 @Controller 6 public class UserController { 7 ?????8 ????public void login(){ 9 ????????System.out.println("-登录Controller-");10 ????}11 }

 1 package ioc.webmvc; 2 ?3 import java.io.IOException; 4 ?5 import javax.servlet.ServletConfig; 6 import javax.servlet.ServletException; 7 import javax.servlet.http.HttpServlet; 8 import javax.servlet.http.HttpServletRequest; 9 import javax.servlet.http.HttpServletResponse;10 11 import ioc.core.impl.AnntationApplicationContext;12 13 /**14 ?* 核心控制，用于拦截所有的请求，MVC框架的入口。15 ?* @author ranger16 ?* @date 2017-11-0817 ?*18 ?*/19 public class DispacherServlet extends HttpServlet {20 21 ????private static final long serialVersionUID = -5969172674760020122L;22 ????private AnntationApplicationContext contextApplication=null;23 ????24 ????25 ????/**26 ?????* 启动Web程序时，获得配置的参数27 ?????*/28 ????@Override29 ????public void init(ServletConfig config) throws ServletException {30 ????????//1.配置参数是配置类的类全名31 ????????String parameter = config.getInitParameter("config");32 ????????//2.查看是否有参数了33 ????????System.out.println(parameter);34 ????????try {35 ????????????//3.将字符串使用反射技术，转成一个Class类36 ????????????Class<?> classType = Class.forName(parameter);37 ????????????//4.将对象加载到容器里面38 ????????????this.contextApplication=new AnntationApplicationContext(classType);39 ????????} catch (ClassNotFoundException e) {40 ????????????e.printStackTrace();41 ????????}42 ????}43 44 45 46 ????@Override47 ????protected void service(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {48 ?????????System.out.println("-测试成功--");49 ????????super.service(request, response);50 ????}51 }

 1 package ioc.webmvc.annotation; 2 ?3 import java.lang.annotation.Documented; 4 import java.lang.annotation.ElementType; 5 import java.lang.annotation.Retention; 6 import java.lang.annotation.RetentionPolicy; 7 import java.lang.annotation.Target; 8 ?9 @Retention(RetentionPolicy.RUNTIME)10 /*11 ?* 12 ?* 指定可以在方法以及类上面使用面使用13 ?* 1.在方法上面，指定请求路径14 ?* 2.在类上面用于指定命名空间15 ?*/16 17 @Target(value={ElementType.METHOD,ElementType.TYPE})18 @Documented19 public @interface RequestMapping {20 ????/**21 ?????* 没有默认值，表示必须要填写22 ?????* @return23 ?????*/24 ????String value();25 26 }

package ioc.core;import java.util.Map;/** * Ioc框架的容器接口 * @author ranger * */public interface Context { ????????/** ?????* 用于获得容器中的所有对象 ?????* @return ?????*/ ????Map<String,Object> getObjects(); ?????????/** ?????* 用于获得容器中的所有业务控制器对象 ?????* @return ?????*/ ????Map<String,Object> getControllerObjects(); ?????????/** ?????* 用于增加容器中的对象 ?????* @param key ?????* @param value ?????*/ ????void addObject(String key, Object value); ?????????/** ?????* 根据类的类型以及设置的对象名返回容器对象 ?????* 如果传入的类型容器中有对应key的对象，而且返回类型是兼容的，直接返回对应的对象。 ?????* 如果传入的类型容器中有没有对应key的对象，那么判断传入的类型是否和容器的对象的找到唯一配置的。 ?????* 如果传入类型唯一匹配，返回对象。如果没有或者配配多个对象，都报一个RuntimeException异常 ?????* @param classType ?????* @return ?????*/ ????Object getObject(Class<?> classType,String key); ?????????}

 1 /** 2 ?????* 用于通过传入标识组件类型的注解，返回对应类型的注解 注解类型分别为： Controller Service Repository 3 ?????* Component 4 ?????* ?5 ?????* @param componentsType 6 ?????* @return 7 ?????*/ 8 ????public Map<String, Object> getObjectsByComponentType(Class<? extends Annotation> componentsType) { 9 ????????// 1.创建一个存储指定组件类型的Map10 ????????Map<String, Object> componentsObjects = new HashMap<String, Object>();11 ????????// 2.获得所有的容器对象12 ????????Map<String, Object> objects = this.getObjects();13 ????????// 3.获得Map中所有的对象的Set集合14 ????????Set<Entry<String, Object>> entrySet = objects.entrySet();15 ????????// 4.获得Set集合迭代器16 ????????Iterator<Entry<String, Object>> iterator = entrySet.iterator();17 ????????// 5.循环判断18 ????????while (iterator.hasNext()) {19 ????????????Entry<String, Object> entry = iterator.next();20 ????????????// 6.获得当前对象的类类型，用于获得该类的类结构中的组件注解21 ????????????Class<?> classType = entry.getValue().getClass();22 ????????????// 7.容器里的对象是否是指定注解类型的,如果是加入到componentsObjects中23 ????????????Annotation annotation = classType.getDeclaredAnnotation(componentsType);24 ????????????if (annotation != null) {25 ????????????????componentsObjects.put(entry.getKey(), entry.getValue());26 ????????????}27 28 ????????}29 ????????// 8.返回指定组件类型的对象30 ????????return componentsObjects;31 ????}32 33 ????/**34 ?????* 返回业务控制器Controller注解类型的所有对象35 ?????*/36 ????@Override37 ????public Map<String, Object> getControllerObjects() {38 ????????return this.getObjectsByComponentType(Controller.class);39 ????}

 1 package ioc.core.test; 2 ?3 import java.util.Map; 4 ?5 import org.junit.Test; 6 ?7 import ioc.core.annotation.stereotype.Service; 8 import ioc.core.impl.AnntationApplicationContext; 9 import ioc.core.impl.ContextImpl;10 import ioc.core.test.config.Config;11 12 public class ContextImplTest {13 ????14 ????15 ????@Test16 ????public void getObjectsByComponentsType(){17 ????????AnntationApplicationContext applicationContext=new AnntationApplicationContext(Config.class);18 ????????ContextImpl context = (ContextImpl) applicationContext.getContext();19 ????????Map<String, Object> componentObjects = context.getObjectsByComponentType(Service.class);20 ????????System.out.println(componentObjects+"==========================");21 ????????22 ????}23 24 }

 ?1 package ioc.webmvc.impl; ?2 ??3 import java.lang.reflect.InvocationTargetException; ?4 import java.lang.reflect.Method; ?5 import java.util.Collection; ?6 import java.util.Iterator; ?7 import java.util.Map; ?8 ??9 import javax.servlet.http.HttpServletRequest; 10 import javax.servlet.http.HttpServletResponse; 11 ?12 import ioc.core.Context; 13 import ioc.webmvc.annotation.RequestMapping; 14 ?15 public class ControllerRelolver { 16 ?17 ????/** 18 ?????* 通过传入的参数，执行路径对应的业务控制器（Controller）的方法 19 ?????* @param request 20 ?????* @param response 21 ?????* @param context 22 ?????* @return 23 ?????* @throws IllegalAccessException 24 ?????* @throws IllegalArgumentException 25 ?????* @throws InvocationTargetException 26 ?????*/ 27 ????public String execute(HttpServletRequest request,HttpServletResponse response,Context context) throws IllegalAccessException, IllegalArgumentException, InvocationTargetException{ 28 ????????//1.获得请求过来的路径 29 ????????String uri = request.getRequestURI(); 30 ????????//2.根据路径规则，获得映射路径 31 ????????String path = this.pathRule(uri); 32 ????????//3.通过路径获得容器中对应的业务控制器的对象和执行方法 33 ????????MappingEnttiy mappingEnttiy = this.getRequestMethod(path, context); 34 ????????//4.获得执行方法 35 ????????Method method = mappingEnttiy.getMethod(); 36 ????????//5.获得路径对应的业务控制器 37 ????????Object controller = mappingEnttiy.getController(); 38 ????????//6.执行方法，执行方法必须有request,response两个参数 39 ?????????Object resultObject = method.invoke(controller, request,response); 40 ?????????if(resultObject!=null){ 41 ?????????????//7.返回执行方法返回的映射字符串 42 ?????????????return (String) resultObject; 43 ?????????} 44 ????????return null; 45 ????} 46 ????/** 47 ?????* 设置路径的规则 48 ?????* 路径规则为，保留/,去掉后缀。 49 ?????* 如： 50 ?????* 请求路径：http://localhost:8080/webmvc-demo-test-01/test.do 51 ?????* 合法的映射路径为：/test 52 ?????* ?53 ?????* @param url 传入的为请求路径 54 ?????* @return ?符合规则的路径字符串 55 ?????* 56 ?????*/ 57 ????private String pathRule(String url){ 58 ????????//1.创建一个String构建字符串 59 ????????StringBuilder sb=new StringBuilder(url); 60 ????????System.out.println(url); 61 ????????//2.删除路径最后一个/之前的所有字符 62 ????????sb.delete(0, url.lastIndexOf("/")); 63 ????????System.out.println(sb.toString()+"删除后的字符串长度："+sb.length()); 64 ????????//3.删除(.)后面的后缀 65 ????????sb.delete(sb.lastIndexOf("."),sb.length()); 66 ????????return sb.toString(); 67 ????} 68 ?????69 ????/** 70 ?????* 通过路径获得对应的业务控制器对象和执行方法 71 ?????* @param path 72 ?????* @param context 73 ?????* @return 74 ?????*/ 75 ????private MappingEnttiy getRequestMethod(String path,Context context){ 76 ????????//1.获得Controller所有的Controller对象 77 ????????Map<String, Object> controllerObjects = context.getControllerObjects(); 78 ????????System.out.println("-getRequestMethod-业务控制器对象池："+controllerObjects); 79 ????????//2.获得业务控制器池里面的所有值 80 ????????Collection<Object> values = controllerObjects.values(); 81 ????????//3.遍历 82 ????????Iterator<Object> iterator = values.iterator(); 83 ????????while (iterator.hasNext()) { 84 ????????????//4.获得业务控制器池中当前对象 85 ????????????Object object = iterator.next(); 86 ????????????//5.获得当前对象的类类类型 87 ????????????Class<? extends Object> classType = object.getClass(); 88 ????????????//6.通过对象的类类型，获得对象的方法列表 89 ????????????Method[] methods = classType.getMethods(); 90 ????????????//7.循环判断方法是否有RequestMapping注解 91 ????????????for(Method method:methods){ 92 ????????????????RequestMapping mapping = method.getDeclaredAnnotation(RequestMapping.class); 93 ????????????????//8.RequestMapping注解存在，而且等于映射路径，返回该方法的方法和当前对象 94 ????????????????if(mapping!=null&&mapping.value().equals(path)){ 95 ????????????????????//9.声明内部类MappingEnttiy来封装映射的方法和对象。创建这个类的对象 96 ????????????????????MappingEnttiy entity=new MappingEnttiy(); 97 ????????????????????entity.setController(object); 98 ????????????????????entity.setMethod(method); 99 ????????????????????return entity;100 ????????????????}101 ????????????}102 ????????????103 ????????}104 ????????105 ????????return null;106 ????}107 ????/**108 ?????* 声明一个私有的内部类对象，用于存储执行检索业务控制器时返回的数据109 ?????* @author ranger110 ?????*111 ?????*/112 ????private class MappingEnttiy{113 ????????//1.当前映射路径对应的对象114 ????????private Object controller;115 ????????//2.当前映射路径对应的方法116 ????????private Method method;117 118 ????????public Object getController() {119 ????????????return controller;120 ????????}121 ????????public void setController(Object controller) {122 ????????????this.controller = controller;123 ????????}124 ????????public Method getMethod() {125 ????????????return method;126 ????????}127 ????????public void setMethod(Method method) {128 ????????????this.method = method;129 ????????}130 ????????131 ????}132 }

 1 package ioc.webmvc; 2 ?3 import java.io.IOException; 4 import java.lang.reflect.InvocationTargetException; 5 ?6 import javax.servlet.ServletConfig; 7 import javax.servlet.ServletException; 8 import javax.servlet.http.HttpServlet; 9 import javax.servlet.http.HttpServletRequest;10 import javax.servlet.http.HttpServletResponse;11 12 import ioc.core.impl.AnntationApplicationContext;13 import ioc.webmvc.impl.ControllerRelolver;14 15 /**16 ?* 核心控制，用于拦截所有的请求，MVC框架的入口。17 ?* 18 ?* @author ranger19 ?* @date 2017-11-0820 ?*21 ?*/22 public class DispacherServlet extends HttpServlet {23 24 ????private static final long serialVersionUID = -5969172674760020122L;25 ????private AnntationApplicationContext contextApplication = null;26 27 ????/**28 ?????* 启动Web程序时，获得配置的参数29 ?????*/30 ????@Override31 ????public void init(ServletConfig config) throws ServletException {32 ????????// 1.配置参数是配置类的类全名33 ????????String parameter = config.getInitParameter("config");34 ????????// 2.查看是否有参数了35 ????????System.out.println(parameter);36 ????????try {37 ????????????// 3.将字符串使用反射技术，转成一个Class类38 ????????????Class<?> classType = Class.forName(parameter);39 ????????????// 4.将对象加载到容器里面40 ????????????this.contextApplication = new AnntationApplicationContext(classType);41 42 ????????} catch (ClassNotFoundException e) {43 ????????????e.printStackTrace();44 ????????}45 ????}46 47 ????@Override48 ????protected void service(HttpServletRequest request, HttpServletResponse response)49 ????????????throws ServletException, IOException {50 ???????51 52 ????????ControllerRelolver rs = new ControllerRelolver();53 ????????try {54 ????????????String result= rs.execute(request, response, contextApplication.getContext());55 ????????????if(result!=null){56 ??????????????????????//返回执行方法57 ????????????????request.getRequestDispatcher(result).forward(request, response);58 ????????????}59 ????????} catch (IllegalAccessException e) {60 ????????????// TODO Auto-generated catch block61 ????????????e.printStackTrace();62 ????????} catch (IllegalArgumentException e) {63 ????????????// TODO Auto-generated catch block64 ????????????e.printStackTrace();65 ????????} catch (InvocationTargetException e) {66 ????????????// TODO Auto-generated catch block67 ????????????e.printStackTrace();68 ????????}69 ????}70 }

 1 package org.webmvc.cofig; 2 ?3 import ioc.core.annotation.ComponentScan; 4 import ioc.core.annotation.Configuration; 5 ?6 //使用定义@Configuration定义该类是一个配置类 7 @Configuration 8 //使用ComponentScan设置扫描包的路径 9 @ComponentScan(basePackages={"org.webmvc.controller"})10 public class IocConfig {11 12 }

 1 package org.webmvc.controller; 2 ?3 import javax.servlet.http.HttpServletRequest; 4 import javax.servlet.http.HttpServletResponse; 5 ?6 import ioc.core.annotation.stereotype.Controller; 7 import ioc.webmvc.annotation.RequestMapping; 8 ?9 @Controller10 public class UserController {11 ????12 ????/**13 ?????* 路径规则：14 ?????* 1.必须包括有/开头15 ?????* 2.后缀必须忽略不写16 ?????* 如：http://localhost:8080/webmvc-demo-test-01/test.do17 ?????* 对应的映射路径为：/test18 ?????* ?19 ?????*/20 ????@RequestMapping(value = "/login")21 ????public String login(HttpServletRequest request,HttpServletResponse response){22 ????????System.out.println("-登录Controller-");23 ????????return "/login.jsp";24 25 ????}26 27 }

<%@ page language="java" contentType="text/html; charset=ISO-8859-1" ???pageEncoding="ISO-8859-1"%><!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"><html><head><meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1"><title>Insert title here</title></head><body> ?<a href="${pageContext.request.contextPath }/login.do">test</a></body></html>

 1 <%@ page language="java" contentType="text/html; charset=UTF-8" 2 ????pageEncoding="UTF-8"%> 3 <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> 4 <html> 5 <head> 6 <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> 7 <title>Insert title here</title> 8 </head> 9 <body>10 ??登录成功!11 </body>12 </html>