list转map，使用java8，stream流

直接上代码

转成Map<String,POJO>类型 对应整个实体类

List<Student> list = super.list();
Map<String, Student> map = list.stream().collect(Collectors.toMap(Student::getId, student -> student));

转成Map<String,String>类型 对应某个字段

List<Student> list = super.list();
Map<String, Student> map = list.stream().collect(Collectors.toMap(Student::getId, Student::getName));