要实现Angular和Spring Boot之间的会话，可以使用基于Token的身份验证方法。下面是一个代码示例来解释这个解决方案：

1. 在Angular应用中，使用HttpClient发送登录请求并获取访问令牌（token）：

import { HttpClient } from '@angular/common/http';

// ...

export class AuthService {
  private loginUrl = 'http://localhost:8080/login';

  constructor(private http: HttpClient) { }

  login(username: string, password: string) {
    return this.http.post(this.loginUrl, { username, password });
  }
}

2. 在Spring Boot的身份验证过滤器中验证用户的凭据，并生成相应的访问令牌：

import org.springframework.security.authentication.AuthenticationManager;
import org.springframework.security.authentication.UsernamePasswordAuthenticationToken;
import org.springframework.security.core.Authentication;
import org.springframework.security.core.AuthenticationException;

// ...

public class JwtAuthenticationFilter extends UsernamePasswordAuthenticationFilter {
  private AuthenticationManager authenticationManager;

  public JwtAuthenticationFilter(AuthenticationManager authenticationManager) {
    this.authenticationManager = authenticationManager;
  }

  @Override
  public Authentication attemptAuthentication(HttpServletRequest request, HttpServletResponse response)
      throws AuthenticationException {
    String username = obtainUsername(request);
    String password = obtainPassword(request);

    UsernamePasswordAuthenticationToken authenticationToken = new UsernamePasswordAuthenticationToken(username,
        password);

    return authenticationManager.authenticate(authenticationToken);
  }

  // ...
}

3. 在Spring Boot的身份验证提供者中验证用户凭据，并生成访问令牌：

import org.springframework.security.authentication.AuthenticationProvider;
import org.springframework.security.authentication.UsernamePasswordAuthenticationToken;
import org.springframework.security.core.Authentication;
import org.springframework.security.core.AuthenticationException;
import org.springframework.security.core.userdetails.UserDetailsService;

// ...

public class JwtAuthenticationProvider implements AuthenticationProvider {
  private UserDetailsService userDetailsService;
  private JwtTokenUtil jwtTokenUtil;

  public JwtAuthenticationProvider(UserDetailsService userDetailsService, JwtTokenUtil jwtTokenUtil) {
    this.userDetailsService = userDetailsService;
    this.jwtTokenUtil = jwtTokenUtil;
  }

  @Override
  public Authentication authenticate(Authentication authentication) throws AuthenticationException {
    String username = authentication.getName();
    String password = authentication.getCredentials().toString();

    // 验证用户凭据，例如从数据库中查询用户
    UserDetails userDetails = userDetailsService.loadUserByUsername(username);
    if (!passwordEncoder.matches(password, userDetails.getPassword())) {
      throw new BadCredentialsException("Invalid username or password");
    }

    // 生成访问令牌
    String token = jwtTokenUtil.generateToken(userDetails);

    return new UsernamePasswordAuthenticationToken(userDetails, token, userDetails.getAuthorities());
  }

  // ...
}

4. 在Angular应用中，将访问令牌存储在本地存储中，并在每个后续请求中发送token：

import { HttpClient, HttpHeaders } from '@angular/common/http';

// ...

export class ApiService {
  private apiUrl = 'http://localhost:8080/api';

  constructor(private http: HttpClient, private authService: AuthService) { }

  getHeaders() {
    const token = localStorage.getItem('token');
    return new HttpHeaders().set('Authorization', `Bearer ${token}`);
  }

  getData() {
    const headers = this.getHeaders();
    return this.http.get(`${this.apiUrl}/data`, { headers });
  }
}

这是一个基本的解决方案，你可以根据你的实际需求进行调整和扩展。