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最近开发了一个需求,定时任务从RPC加载全量数据缓存到redis中,周期性的刷新缓存中的数据。客户端调用API,通过参数key和当前页pageIndex和页大小pageSize,查询对应的页码的数据。我模拟的一下当时的代码:
package page;public class User { private int id; private Integer age; private String name; public User(){ } public User(int id, Integer age, String name) { this.id = id; this.age = age; this.name = name; } public int getId() { return id; } public void setId(int id) { this.id = id; } public Integer getAge() { return age; } public void setAge(Integer age) { this.age = age; } public String getName() { return name; } public void setName(String name) { this.name = name; } @Override public String toString() { return "User{" + "id=" + id + ", age=" + age + ", name="" + name + "\"" + "}"; }}package page;import java.util.ArrayList;import java.util.List;import java.util.stream.Collectors;public class PageTest { public static void main(String[] args) { String searchKey = "北京"; Integer pageIndex = 2; Integer pageSize = 2; List<User> userList = getUserPageList(searchKey,pageIndex,pageSize); System.out.println(userList); } private static List<User> getUserPageList(String searchKey,Integer pageIndex,Integer pageSize) { List<User> userList = getUsers(); List<User> users = userList.stream().filter(user -> user.getName().contains(searchKey)).skip((pageIndex-1)*pageSize).limit(pageSize).collect(Collectors.toList()); return users; } private static List<User> getUsers() { List<User> userList = new ArrayList<>(); userList.add(new User(1,1,"北京1")); userList.add(new User(2,2,"北京2")); userList.add(new User(3,3,"北京3")); userList.add(new User(4,4,"北京4")); userList.add(new User(5,5,"北京5")); userList.add(new User(6,6,"上海1")); userList.add(new User(7,7,"上海2")); userList.add(new User(8,8,"上海3")); userList.add(new User(9,9,"上海4")); userList.add(new User(10,10,"上海5")); userList.add(new User(11,11,"南京1")); userList.add(new User(12,12,"南京2")); userList.add(new User(13,13,"南京3")); userList.add(new User(14,14,"南京4")); userList.add(new User(15,15,"浙江1")); return userList; }}查询结果:
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