初始化
niuniuniu
commit
528f61742a
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@ -0,0 +1,38 @@
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target/
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!.mvn/wrapper/maven-wrapper.jar
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!**/src/main/**/target/
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!**/src/test/**/target/
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### IntelliJ IDEA ###
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.idea/modules.xml
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.idea/jarRepositories.xml
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.idea/compiler.xml
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.idea/libraries/
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*.iws
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*.iml
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*.ipr
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### Eclipse ###
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.apt_generated
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.classpath
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.factorypath
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.project
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.settings
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.springBeans
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.sts4-cache
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### NetBeans ###
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/nbproject/private/
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/nbbuild/
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/dist/
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/nbdist/
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/.nb-gradle/
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build/
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!**/src/main/**/build/
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!**/src/test/**/build/
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### VS Code ###
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.vscode/
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### Mac OS ###
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.DS_Store
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# 默认忽略的文件
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/shelf/
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/workspace.xml
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# 基于编辑器的 HTTP 客户端请求
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/httpRequests/
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# Datasource local storage ignored files
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/dataSources/
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/dataSources.local.xml
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<?xml version="1.0" encoding="UTF-8"?>
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<project version="4">
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<component name="accountSettings">
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<option name="activeRegion" value="us-east-1" />
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<option name="recentlyUsedRegions">
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<list>
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<option value="us-east-1" />
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</list>
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</option>
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</component>
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</project>
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<?xml version="1.0" encoding="UTF-8"?>
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<project version="4">
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<component name="Encoding">
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<file url="file://$PROJECT_DIR$/src/main/java" charset="UTF-8" />
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<file url="file://$PROJECT_DIR$/src/main/resources" charset="UTF-8" />
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</component>
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</project>
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<?xml version="1.0" encoding="UTF-8"?>
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<project version="4">
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<component name="CodeInsightWorkspaceSettings">
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<option name="optimizeImportsOnTheFly" value="true" />
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</component>
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<component name="ExternalStorageConfigurationManager" enabled="true" />
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<component name="MarkdownSettingsMigration">
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<option name="stateVersion" value="1" />
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</component>
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<component name="MavenProjectsManager">
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<option name="originalFiles">
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<list>
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<option value="$PROJECT_DIR$/pom.xml" />
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</list>
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</option>
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</component>
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<component name="ProjectRootManager" version="2" languageLevel="JDK_17" project-jdk-name="17" project-jdk-type="JavaSDK">
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<output url="file://$PROJECT_DIR$/out" />
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</component>
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</project>
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<?xml version="1.0" encoding="UTF-8"?>
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<project version="4">
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<component name="VcsDirectoryMappings">
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<mapping directory="$PROJECT_DIR$" vcs="Git" />
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</component>
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</project>
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<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
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xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">
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<modelVersion>4.0.0</modelVersion>
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<groupId>com.brave</groupId>
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<artifactId>untitled7</artifactId>
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<packaging>war</packaging>
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<version>1.0-SNAPSHOT</version>
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<name>untitled7 Maven Webapp</name>
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<url>http://maven.apache.org</url>
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<dependencies>
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<dependency>
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<groupId>junit</groupId>
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<artifactId>junit</artifactId>
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<version>3.8.1</version>
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<scope>test</scope>
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</dependency>
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<dependency>
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<groupId>javax.servlet</groupId>
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<artifactId>javax.servlet-api</artifactId>
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<version>4.0.1</version>
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<scope>provided</scope>
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</dependency>
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<dependency>
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<groupId>org.reflections</groupId>
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<artifactId>reflections</artifactId>
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<version>0.9.11</version>
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</dependency>
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<dependency>
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<groupId>org.springframework.boot</groupId>
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<artifactId>spring-boot-maven-plugin</artifactId>
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<version>2.5.2</version>
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</dependency>
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</dependencies>
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<build>
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<resources>
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<resource>
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<directory>src/main/java</directory>
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<includes>
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<include>**/*.*</include>
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</includes>
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</resource>
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<resource>
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<directory>src/main/resources</directory>
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<includes>
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<include>**/*.*</include>
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</includes>
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</resource>
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</resources>
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<plugins>
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<plugin>
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<groupId>org.springframework.boot</groupId>
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<artifactId>spring-boot-maven-plugin</artifactId>
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<version>2.5.2</version>
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</plugin>
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</plugins>
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</build>
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</project>
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package com.brave.annotation;
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import java.lang.annotation.ElementType;
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import java.lang.annotation.Retention;
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import java.lang.annotation.RetentionPolicy;
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import java.lang.annotation.Target;
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@Target(ElementType.TYPE)
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@Retention(RetentionPolicy.RUNTIME)
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public @interface MyController {
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String value() default "";
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}
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package com.brave.annotation;
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import java.lang.annotation.ElementType;
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import java.lang.annotation.Retention;
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import java.lang.annotation.RetentionPolicy;
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import java.lang.annotation.Target;
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@Target({ElementType.TYPE,ElementType.METHOD})
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@Retention(RetentionPolicy.RUNTIME)
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public @interface MyRequestMapping {
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String value() default "";
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}
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package com.brave.controller;
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import com.brave.annotation.MyController;
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import com.brave.annotation.MyRequestMapping;
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@MyRequestMapping(value = "/test")
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@MyController
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public class TestController {
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@MyRequestMapping(value = "/test1")
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public void test1() {
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System.out.println("test1被调用");
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}
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@MyRequestMapping(value = "/test2")
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public void test2() {
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System.out.println("test2被调用了");
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}
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@MyRequestMapping(value = "/test3")
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public void test3(){
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System.out.println("test3被调用了");
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}
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}
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package com.brave.servlet;
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import com.brave.annotation.MyController;
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import com.brave.annotation.MyRequestMapping;
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import org.reflections.Reflections;
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import javax.servlet.ServletConfig;
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import javax.servlet.ServletException;
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import javax.servlet.http.HttpServlet;
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import javax.servlet.http.HttpServletRequest;
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import javax.servlet.http.HttpServletResponse;
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import java.io.IOException;
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import java.io.InputStream;
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import java.lang.reflect.InvocationTargetException;
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import java.lang.reflect.Method;
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import java.util.*;
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public class MyDispatcherServlet extends HttpServlet {
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/**
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* 配置扫描的包，放到一个.properties文件中，在初始化的时候读取
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*/
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private Properties properties=new Properties();
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/**
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* 需要一个set，把所有能够相应controller的存起来
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*/
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private Set<Class<?>> classSet=new HashSet<>();
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/**
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* SpringMVC容器
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*/
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private Map<String, Object> springMVCContext=new HashMap<>();
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/**
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* 映射处理器，存储所有的方法
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*/
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private Map<String, Method> handlerMapping=new HashMap<>();
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/**
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* 后端处理器的映射关系，存储所有controller
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*/
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private Map<String,Object> controllerMap=new HashMap<>();
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@Override
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public void init(ServletConfig config) throws ServletException {
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//加载配置文件，在web.xml中配置的初始化参数contextfigLocation
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String initParameter = config.getInitParameter("contextConfigLocation");
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try {
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loadConfigFile(initParameter);
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}catch (Exception e){
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e.printStackTrace();
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}
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//扫描controller
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scanPackage(properties.getProperty("package"));
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//初始化controller包
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initController();
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//初始化处理器映射器
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initHandlerMapping();
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}
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@Override
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protected void service(HttpServletRequest req, HttpServletResponse resp){
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//处理请求
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if (handlerMapping.isEmpty()){
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return;
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}
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//获取url
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String uri = req.getRequestURI();
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String contextPath = req.getContextPath();
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String url = uri.replace(contextPath, "");
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if (!handlerMapping.containsKey(url)){
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try {
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resp.getWriter().println("404");
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} catch (IOException e) {
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throw new RuntimeException(e);
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}
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}else {
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Method method = handlerMapping.get(url);
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Object controller = controllerMap.get(url);
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try {
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method.invoke(controller);
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} catch (IllegalAccessException e) {
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throw new RuntimeException(e);
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} catch (InvocationTargetException e) {
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throw new RuntimeException(e);
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}
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}
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}
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private void initHandlerMapping() {
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if (springMVCContext.isEmpty()){
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return;
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}
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for (Map.Entry<String, Object> entry : springMVCContext.entrySet()) {
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//获取class对象
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Class<?> aClass = entry.getValue().getClass();
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if (!aClass.isAnnotationPresent(MyController.class)){
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continue;
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}else {
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String baseUrl="";
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if (aClass.isAnnotationPresent(MyRequestMapping.class)){
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//如果类包含注解MyRequestMapping，获取注解值
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MyRequestMapping annotation = aClass.getAnnotation(MyRequestMapping.class);
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baseUrl=annotation.value();
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}
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//获取所有方法
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Method[] methods=aClass.getMethods();
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for (Method method : methods) {
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//判断方法上含有MyRequestMapping注解
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if (method.isAnnotationPresent(MyRequestMapping.class)){
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MyRequestMapping annotation = method.getAnnotation(MyRequestMapping.class);
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String url = annotation.value();
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url = baseUrl +url;
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//将该放入方法集
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handlerMapping.put(url,method);
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try {
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//放入controllerMap中
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controllerMap.put(url,aClass.newInstance());
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} catch (InstantiationException e) {
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throw new RuntimeException(e);
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} catch (IllegalAccessException e) {
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throw new RuntimeException(e);
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}
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}
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}
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}
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}
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}
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private void initController() {
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if (classSet.isEmpty()){
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return;
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}
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for (Class<?> controller : classSet) {
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try {
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springMVCContext.put(lowerFirstWord(controller.getSimpleName()), controller.newInstance());
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} catch (InstantiationException e) {
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throw new RuntimeException(e);
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} catch (IllegalAccessException e) {
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throw new RuntimeException(e);
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}
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}
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}
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private String lowerFirstWord(String simpleName) {
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char[] array = simpleName.toCharArray();
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array[0] +=32;
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return String.valueOf(array);
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}
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private void scanPackage(String packageName) {
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Reflections reflections = new Reflections(packageName);
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classSet=reflections.getTypesAnnotatedWith(MyController.class);
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}
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private void loadConfigFile(String fileName) {
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//以流的方式获取资源
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InputStream inputStream = this.getClass().getClassLoader().getResourceAsStream(fileName);
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try {
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properties.load(inputStream);
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} catch (IOException e) {
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throw new RuntimeException(e);
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}finally {
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try {
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inputStream.close();
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} catch (IOException e) {
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throw new RuntimeException(e);
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}
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}
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}
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}
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@ -0,0 +1,22 @@
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<?xml version="1.0" encoding="UTF-8"?>
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<web-app xmlns="http://xmlns.jcp.org/xml/ns/javaee"
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xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
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xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_4_0.xsd"
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version="4.0">
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<!-- 配置我们自己的前端控制器，MyDispatcherServlet就是一个servlet，拦截前端发送的请求-->
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<servlet>
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<servlet-name>dispatcherServlet</servlet-name>
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<servlet-class>com.brave.servlet.MyDispatcherServlet</servlet-class>
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<!-- 配置扫描包-->
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<init-param>
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<param-name>contextConfigLocation</param-name>
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<param-value>application.properties</param-value>
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</init-param>
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</servlet>
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<servlet-mapping>
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<servlet-name>dispatcherServlet</servlet-name>
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<!-- 拦截所有请求-->
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<url-pattern>/</url-pattern>
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</servlet-mapping>
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</web-app>
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@ -0,0 +1,5 @@
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<html>
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<body>
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<h2>Hello World!</h2>
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</body>
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</html>
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Loading…
Reference in New Issue