Java 8 新特性

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@Override    public List<String> getUserRoles(String username) {<br>　　　　//找到以ROLE_开头的，并且映射为字符串数组        return userDetailsService.loadUserByUsername(username).getAuthorities().stream()                .filter((GrantedAuthority a) -> a.getAuthority().startsWith("ROLE_"))                .map((GrantedAuthority a) -> a.getAuthority().substring(5))                .collect(Collectors.toList());    }

2、收集为Map

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1	Map<String, String> buMap = buList.stream().collect(Collectors.toMap(OrgHierarchy::getBuName, OrgHierarchy::getBuUniteCode, (key1, key2) -> key1));