自定义登录页面

在自定义的WebSecurityConfigurerAdapter的子类重写的configure方法中添加.loginPage(String url)方法指明登录页的路径。
由于登录页不需要身份验证，所以配置不认证该url。

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自定义登录成功处理

自定义类实现org.springframework.security.web.authentication.AuthenticationSuccessHandler，并重写其onAuthenticationSuccess()方法

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该方法接收一个Authentication接口实现对象，该对象封装了认证信息。
可以将该对象以json方式发送到前台。

@Component(value = "imoocAuthenticationSuccessHandler")
public class ImoocAuthenticationSuccessHandler implements AuthenticationSuccessHandler {

    @Autowired
    private ObjectMapper objectMapper;

    @Override
    public void onAuthenticationSuccess(HttpServletRequest httpServletRequest,
                                        HttpServletResponse httpServletResponse,
                                        Authentication authentication) throws IOException, ServletException {

        httpServletResponse.setContentType("application/json; charset=utf-8");
        httpServletResponse.getWriter().write(objectMapper.writeValueAsString(authentication));
    }
}

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配置successHandler

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自定义登录错误处理

自定义类实现AuthenticationFailureHandler，并重写其 onAuthenticationFailure方法

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该方法接收一个AuthenticationException，封装了认证错误信息。

@Component(value = "imoocAuthenticationFailureHandler")
public class ImoocAuthenticationFailureHandler implements AuthenticationFailureHandler {

    @Autowired
    private ObjectMapper objectMapper;

    @Override
    public void onAuthenticationFailure(HttpServletRequest httpServletRequest,
                                        HttpServletResponse httpServletResponse,
                                        AuthenticationException e) throws IOException, ServletException {
        httpServletResponse.setContentType("application/json; charset=utf-8");
        httpServletResponse.setStatus(HttpStatus.INTERNAL_SERVER_ERROR.value()); //500错误信息
        httpServletResponse.getWriter().write(objectMapper.writeValueAsString(e));
    }
}

配置失败处理器

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若要使用SpringSecurity默认的成功处理方式，则继承SavedRequestAwareAuthenticationSuccessHandler
默认认证失败的处理类SimpleUrlAuthenticationFailureHandler