JAVA設計模式 4【建立型】理解建造者模式

阿新 • • 發佈：2020-07-02

1.1 依賴包匯入
2.1 沒有安全機制下的一個web
3.1 做一個安全機制的web

官網https://spring.io/guides/gs/securing-web/
無情的翻譯官。。。。。。

1.1 依賴包匯入

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
	xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
	<modelVersion>4.0.0</modelVersion>
	<parent>
		<groupId>org.springframework.boot</groupId>
		<artifactId>spring-boot-starter-parent</artifactId>
		<version>2.2.2.RELEASE</version>
		<relativePath/> <!-- lookup parent from repository -->
	</parent>
	<groupId>com.example</groupId>
	<artifactId>securing-web</artifactId>
	<version>0.0.1-SNAPSHOT</version>
	<name>securing-web</name>
	<description>Demo project for Spring Boot</description>

	<properties>
		<java.version>1.8</java.version>
	</properties>

	<dependencies>
		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-thymeleaf</artifactId>
		</dependency>
		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-web</artifactId>
		</dependency>
		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-security</artifactId>
		</dependency>
		<dependency>
			<groupId>org.springframework.security</groupId>
			<artifactId>spring-security-test</artifactId>
			<scope>test</scope>
		</dependency>

		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-test</artifactId>
			<scope>test</scope>
			<exclusions>
				<exclusion>
					<groupId>org.junit.vintage</groupId>
					<artifactId>junit-vintage-engine</artifactId>
				</exclusion>
			</exclusions>
		</dependency>
	</dependencies>

	<build>
		<plugins>
			<plugin>
				<groupId>org.springframework.boot</groupId>
				<artifactId>spring-boot-maven-plugin</artifactId>
			</plugin>
		</plugins>
	</build>

</project>

裡面引入了測試要用到的web模組，thymeleaf引擎模組，以及咱們的security模組

2.1 沒有安全機制下的一個web

測試的專案有兩個頁面home.html和hello.html

src/main/resources/templates/home.html:

<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml" xmlns:th="https://www.thymeleaf.org" xmlns:sec="https://www.thymeleaf.org/thymeleaf-extras-springsecurity3">
    <head>
        <title>Spring Security Example</title>
    </head>
    <body>
        <h1>Welcome!</h1>

        <p>Click <a th:href="@{/hello}">here</a> to see a greeting.</p>
    </body>
</html>

home頁面提交到一個/hello請求，會返回一個hello.html:

src/main/resources/templates/hello.html:

<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml" xmlns:th="https://www.thymeleaf.org"
      xmlns:sec="https://www.thymeleaf.org/thymeleaf-extras-springsecurity3">
    <head>
        <title>Hello World!</title>
    </head>
    <body>
        <h1>Hello world!</h1>
    </body>
</html>

這個web專案依賴於springmvc，我們可以自定義一下檢視解析器：

src/main/java/com/example/securingweb/MvcConfig.java：

package com.example.securingweb;

import org.springframework.context.annotation.Configuration;
import org.springframework.web.servlet.config.annotation.ViewControllerRegistry;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurer;

@Configuration
public class MvcConfig implements WebMvcConfigurer {

	public void addViewControllers(ViewControllerRegistry registry) {
		registry.addViewController("/home").setViewName("home");
		registry.addViewController("/").setViewName("home");
		registry.addViewController("/hello").setViewName("hello");
		registry.addViewController("/login").setViewName("login");
	}

}

這種無安全機制的web任何人都可以通過localhost:8080/hello 直接訪問到hello.html.
假設我們要防止那些沒有經過授權的使用者進入到hello.html頁面，就需要用到我們的security模組。

3.1 做一個安全機制的web

在引入了我們的security包的情況下，我們需要自定義下我們的安全規則;

src/main/java/com/example/securingweb/WebSecurityConfig.java:

package com.example.securingweb;

import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.security.config.annotation.web.builders.HttpSecurity;
import org.springframework.security.config.annotation.web.configuration.EnableWebSecurity;
import org.springframework.security.config.annotation.web.configuration.WebSecurityConfigurerAdapter;
import org.springframework.security.core.userdetails.User;
import org.springframework.security.core.userdetails.UserDetails;
import org.springframework.security.core.userdetails.UserDetailsService;
import org.springframework.security.provisioning.InMemoryUserDetailsManager;

@Configuration
@EnableWebSecurity
public class WebSecurityConfig extends WebSecurityConfigurerAdapter {
	@Override
	protected void configure(HttpSecurity http) throws Exception {
		http
			.authorizeRequests()
				.antMatchers("/", "/home").permitAll()
				.anyRequest().authenticated()
				.and()
			.formLogin()
				.loginPage("/login")
				.permitAll()
				.and()
			.logout()
				.permitAll();
	}

	@Bean
	@Override
	public UserDetailsService userDetailsService() {
		UserDetails user =
			 User.withDefaultPasswordEncoder()
				.username("user")
				.password("password")
				.roles("USER")
				.build();

		return new InMemoryUserDetailsManager(user);
	}
}

@EnableWebSecurity:用於開啟springSecurity模組功能和提供與springmvc整合的功能
WebSecurityConfigurerAdapter：自定義的配置都要繼承這個類
configure(HttpSecurity)：定義了哪些http請求需要被安全加密，哪些可以被放行通過。這裡"/","home"這兩個路徑不需要任何授權請求，也就是說任何人都可以訪問。這裡注意鏈式寫法用.and()銜接。
formLogin()和logout()這兩個一般都是單獨定製，對於formLogin()我們把它轉向到我們自己寫的login頁面，否則SpringSecurity在攔截到一個非法請求的時候會返回你一個自帶的login頁面。當然對於這兩個頁面我們都是對放行的。
userDetailsService() ：定義了一個記憶體物件，這裡注意withDefaultPasswordEncoder(),高版本的SpringSecurity已經不允許明碼形式的密碼，必須對密碼進行加密再傳送。

src/main/resources/templates/login.html：

<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml" xmlns:th="https://www.thymeleaf.org"
      xmlns:sec="https://www.thymeleaf.org/thymeleaf-extras-springsecurity3">
    <head>
        <title>Spring Security Example </title>
    </head>
    <body>
        <div th:if="${param.error}">
            Invalid username and password.
        </div>
        <div th:if="${param.logout}">
            You have been logged out.
        </div>
        <form th:action="@{/login}" method="post">
            <div><label> User Name : <input type="text" name="username"/> </label></div>
            <div><label> Password: <input type="password" name="password"/> </label></div>
            <div><input type="submit" value="Sign In"/></div>
        </form>
    </body>
</html>

src/main/resources/templates/hello.html：

<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml" xmlns:th="https://www.thymeleaf.org"
      xmlns:sec="https://www.thymeleaf.org/thymeleaf-extras-springsecurity3">
    <head>
        <title>Hello World!</title>
    </head>
    <body>
        <h1 th:inline="text">Hello [[${#httpServletRequest.remoteUser}]]!</h1>
        <form th:action="@{/logout}" method="post">
            <input type="submit" value="Sign Out"/>
        </form>
    </body>
</html>