1. 增加 yudao-sso-demo-by-code 项目，实现基于授权码模式的单点登录

2. 完成 yudao-sso-demo-by-code 的跳转 SSO 流程

yudao-example/yudao-sso-demo-by-code/src/main/java/cn/iocoder/yudao/ssodemo/SSODemoApplication.java

@@ -0,0 +1,13 @@
+package cn.iocoder.yudao.ssodemo;
+
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+
+@SpringBootApplication
+public class SSODemoApplication {
+
+    public static void main(String[] args) {
+        SpringApplication.run(SSODemoApplication.class, args);
+    }
+
+}

yudao-example/yudao-sso-demo-by-code/src/main/java/cn/iocoder/yudao/ssodemo/controller/AuthController.java

@@ -0,0 +1,14 @@
+package cn.iocoder.yudao.ssodemo.controller;
+
+import org.springframework.stereotype.Controller;
+import org.springframework.web.bind.annotation.PostMapping;
+
+@Controller("/auth")
+public class AuthController {
+
+    @PostMapping("/login-by-code")
+    public void loginByCode() {
+
+    }
+
+}

yudao-example/yudao-sso-demo-by-code/src/main/java/cn/iocoder/yudao/ssodemo/framework/SecurityConfiguration.java

@@ -0,0 +1,20 @@
+package cn.iocoder.yudao.ssodemo.framework;
+
+import org.springframework.context.annotation.Configuration;
+import org.springframework.http.HttpMethod;
+import org.springframework.security.config.annotation.web.builders.HttpSecurity;
+import org.springframework.security.config.annotation.web.configuration.WebSecurityConfigurerAdapter;
+
+@Configuration
+public class SecurityConfiguration extends WebSecurityConfigurerAdapter {
+
+    @Override
+    protected void configure(HttpSecurity httpSecurity) throws Exception {
+        httpSecurity.authorizeRequests()
+                // 1. 静态资源，可匿名访问
+                .antMatchers(HttpMethod.GET, "/*.html", "/**/*.html", "/**/*.css", "/**/*.js").permitAll()
+                // last. 兜底规则，必须认证
+                .and().authorizeRequests()
+                .anyRequest().authenticated();
+    }
+}