如何在Java 8中进行条件方法链接

Question

我有一个spring安全配置方法。我希望仅当条件匹配时才将特定方法链接到{dev == true ? .antMatchers("/**/**").permitAll(): ()->{}}。像这样的@Override protected void configure(HttpSecurity http) throws Exception { http .csrf().disable() .cors().disable() .authorizeRequests() {dev == true ? .antMatchers("/**/**").permitAll(): ()->{}} //dev only. NEVER enable on prod .antMatchers("/", "/signup", "/static/**", "/api/sigin", "/api/signup", "**/favicon.ico").permitAll() .anyRequest().authenticated() .and() .formLogin() .loginPage("/") .loginProcessingUrl("/api/signin") .successHandler(authSuccessHandler()) .failureHandler(authFailureHandler()) .permitAll() .and() .logout() .permitAll(); } 。当然，这不是有效的语法， MOST CONSISE 的实现方式是什么。寻找最简单的编码。

STDIN

Answer 1

唯一的方法是将中间对象分配给变量。

WhateverAuthorizeRequestsReturns partial = http
    .csrf().disable()
    .cors().disable()
    .authorizeRequests();

if (dev) // note: you don't need 'dev == true' like you had
{
    partial.someOptionalThing();
    // if the type is immutable then you need to reassign e.g.:
    // partial = partial.someOptionalThing()
}

partial.something()
    .somethingElse()
    .andTheRest();

Answer 2

如果您要做的就是允许基于布尔值访问某些路径，则可以尝试以下方法：

 http
        .csrf().disable()
        .cors().disable()
        .authorizeRequests()
        .antMatchers(dev ? "/**/**":"invalid-path").permitAll()
            .antMatchers("/", "/signup", "/static/**", "/api/sigin", "/api/signup", "**/favicon.ico").permitAll()
            .anyRequest().authenticated()
            .and()
        .formLogin()
            .loginPage("/")
            .loginProcessingUrl("/api/signin")
            .successHandler(authSuccessHandler())
            .failureHandler(authFailureHandler())
            .permitAll()
            .and()
        .logout()
            .permitAll();