Spring security如何重写Filter实现json登录

public class UsernamePasswordAuthenticationFilter extends AbstractAuthenticationProcessingFilter {
    public static final String SPRING_SECURITY_FORM_USERNAME_KEY = "username";
    public static final String SPRING_SECURITY_FORM_PASSWORD_KEY = "password";
    private String usernameParameter = SPRING_SECURITY_FORM_USERNAME_KEY;
    private String passwordParameter = SPRING_SECURITY_FORM_PASSWORD_KEY;
    private boolean postOnly = true;
    public UsernamePasswordAuthenticationFilter() {
        super(new AntPathRequestMatcher("/login", "POST"));
    }
    public Authentication attemptAuthentication(httpservletRequest request, HttpServletResponse response) throws AuthenticationException {
        if (postOnly && !request.getMethod().equals("POST")) {
            throw new AuthenticationServiceException("Authentication method not supported: " + request.getMethod());
        }
        String username = obtainUsername(request);
        String password = obtainPassword(request);
        if (username == null) {
            username = "";
        }
        if (password == null) {
            password = "";
        }
        username = username.trim();
        UsernamePasswordAuthenticationToken authRequest = new UsernamePasswordAuthenticationToken(username, password);        // Allow subclasses to set the "details" property        
        setDetails(request, authRequest);
        return this.getAuthenticationManager().authenticate(authRequest);
    }
    protected String obtainPassword(HttpServletRequest request) {
        return request.getParameter(passwordParameter);
    }
    protected String obtainUsername(HttpServletRequest request) {
        return request.getParameter(usernameParameter);
    }    
    //...    
    //...
}

public class CustomAuthenticationFilter extends UsernamePasswordAuthenticationFilter {
    
    @Override
    public Authentication attemptAuthentication(HttpServletRequest request, HttpServletResponse response) throws AuthenticationException {
        if (request.getContentType().equals(MediaType.APPLICATION_JSON_UTF8_VALUE) || request.getContentType().equals(MediaType.APPLICATION_JSON_VALUE)) {
            ObjectMapper mapper = new ObjectMapper();
            UsernamePasswordAuthenticationToken authRequest = null;
            try (InputStream is = request.getInputStream()) {
                Map<String, String> authenticationBean = mapper.readValue(is, Map.class);
                authRequest = new UsernamePasswordAuthenticationToken(authenticationBean.get("username"), authenticationBean.get("password"));
            } catch (IOException e) {
                e.printStackTrace();
                authRequest = new UsernamePasswordAuthenticationToken("", "");
            } finally {
                setDetails(request, authRequest);
                return this.getAuthenticationManager().authenticate(authRequest);
            }
        } else {
            return super.attemptAuthentication(request, response);
        }
    }
}

@Override
protected void configure(HttpSecurity http) throws Exception {
            http.authorizeRequests().anyRequest().authenticated().and().formLogin().and().csrf().disable();
            http.addFilterAt(customAuthenticationFilter(), UsernamePasswordAuthenticationFilter.class);
}
@Bean
CustomAuthenticationFilter customAuthenticationFilter() throws Exception {
            CustomAuthenticationFilter filter = new CustomAuthenticationFilter();
            filter.setAuthenticationSuccesshandler(new AuthenticationSuccessHandler() {
                @Override
                public void onAuthenticationSuccess(HttpServletRequest req, HttpServletResponse resp, Authentication authentication) throws IOException, ServletException {
                    resp.setContentType("application/json;charset=utf-8");
                    PrintWriter out = resp.getWriter();
                    RespBean respBean = RespBean.ok("登录成功!");
                    out.write(new ObjectMapper().writeValueAsString(respBean));
                    out.flush();
                    out.close();
                }
            });
            filter.setAuthenticationFailureHandler(new AuthenticationFailureHandler() {
                @Override
                public void onAuthenticationFailure(HttpServletRequest req, HttpServletResponse resp, AuthenticationException e) throws IOException, ServletException {
                    resp.setContentype("application/json;charset=utf-8");
                    PrintWriter out = resp.getWriter();
                    RespBean respBean = RespBean.error("登录失败!");
                    out.write(new ObjectMapper().writeValueAsString(respBean));
                    out.flush();
                    out.close();
                }
            });
            filter.setAuthenticationManager(authenticationManagerBean());
            return filter;
        }

public class CustomUsernamePasswordAuthenticationFilter extends UsernamePasswordAuthenticationFilter {
 
    @Override
    @SneakyThrows(IOException.class) //lombok try catch
    public Authentication attemptAuthentication(HttpServletRequest request, HttpServletResponse response) throws AuthenticationException {
        if (request.getContentType().contains(MediaType.APPLICATION_JSON_VALUE)) {
            ObjectMapper mapper = new ObjectMapper();
            Map<String,String> map = mapper.readValue(request.getInputStream(), Map.class);
            String username = map.get(super.getUsernameParameter());
            String password = map.get(super.getPasswordParameter());
            if (username == null) {
                username = "";
            }
            if (password == null) {
                password = "";
            }
            username = username.trim();
            UsernamePasswordAuthenticationToken authRequest = new UsernamePasswordAuthenticationToken(
                    username, password);
            setDetails(request, authRequest);
            return this.getAuthenticationManager().authenticate(authRequest);
        }
        return super.attemptAuthentication(request, response);
    }
}

@EnableWEBSecurity
public class SecurityConfig extends WebSecurityConfigurerAdapter {
 
    @Override
    protected void configure(HttpSecurity http) throws Exception {
       http.addFilterAt(usernamePasswordAuthenticationFilter(), UsernamePasswordAuthenticationFilter.class)
    }
 
     CustomUsernamePasswordAuthenticationFilter usernamePasswordAuthenticationFilter() throws Exception {
        CustomUsernamePasswordAuthenticationFilter filter = new CustomUsernamePasswordAuthenticationFilter();
        filter.setAuthenticationManager(super.authenticationManagerBean());
        filter.setFilterProcessesUrl(customSecurityProperties.getLoginUrl());
        //处理登录成功
        filter.setAuthenticationSuccessHandler(new AuthenticationSuccessHandler());
        //处理登录失败
        filter.setAuthenticationFailureHandler(new AuthenticationFailureHandler());
        return filter;
    }
}