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 antMatchers("/**/**").permitAll()。像这样 {dev == true ? .antMatchers("/**/**").permitAll(): ()->{}} 。当然，这不是有效的语法，最简洁 的做法是什么。正在寻找最低编码。

@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();
    }

Answer 1

唯一的方法是将中间对象赋给一个变量。

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

如果你只想允许访问基于布尔值的特定路径，你可以试试这个：

 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();

如何在 Java 8 中进行条件方法链接

How to do Conditional Method chaining in Java 8

java

spring-boot

java-8

method-chaining