需求:
- 给10万个用户每个用户发一条祝福短信。
- 为了提高数程序的效率，请使用多线程技术分批发送据。
- 每开一个线程，都会占用CPU资源
- 服务器（电脑）配置 CPU 核数
建立项目名称:rain_thread_batch
新建用户实体类
package com.rain.entity;
public class UserEntity {
private String userid;
private String username;
public UserEntity() {
}
public UserEntity(String userid, String username) {
this.userid = userid;
this.username = username;
}
public String getUserid() {
return userid;
}
public void setUserid(String userid) {
this.userid = userid;
}
public String getUsername() {
return username;
}
public void setUsername(String username) {
this.username = username;
}
@Override
public String toString() {
return "UserEntity [userid=" + userid + ", username=" + username + "]";
}
}
建立多线程类UserThread执行发送短信
// 多线程类
class UserSendThread implements Runnable {
private List<UserEntity> listUser;
public UserSendThread(List<UserEntity> listUser) {
this.listUser = listUser;
}
@Override
public void run() {
for(UserEntity userEntity:listUser) {
System.out.println(Thread.currentThread().getName()+", "+userEntity.toString());;
}
System.out.println();
}
}
计算分页工具类
package com.rain.utils;
import java.util.ArrayList;
import java.util.List;
public class ListUtils {
/**
* @methodDesc分页工具
* @param list
* @param pageSize
* @return
*/
public static <T> List<List<T>> splitList(List<T> list, int pageSize) {
int listSize = list.size();
int page = (listSize + (pageSize - 1)) / pageSize;
List<List<T>>listArray = new ArrayList<List<T>>();
for (int i = 0; i<page; i++) {
List<T>subList = new ArrayList<T>();
for (int j = 0; j<listSize; j++) {
int pageIndex = ((j + 1) + (pageSize - 1)) / pageSize;
if (pageIndex == (i + 1)) {
subList.add(list.get(j));
}
if ((j + 1) == ((j + 1) * pageSize)) {
break;
}
}
listArray.add(subList);
}
return listArray;
}
}
初始化数据并实现发送短信
package com.rain;
import java.util.ArrayList;
import java.util.List;
import com.rain.entity.UserEntity;
import com.rain.utils.ListUtils;
public class BatchSms {
public static void main(String[] args) {
// 1、初始化数据
List<UserEntity> initUser = initUser();
// 2、定义每个线程分批发送大小
int userCount = 2;
// 3、计算每个线程需要分配跑的数据
List<List<UserEntity>> splitList = ListUtils.splitList(initUser,userCount);
for(int i=0; i<splitList.size(); i++) {
List<UserEntity> list = splitList.get(i);
// for(UserEntity u : list) {
// System.out.println(u.toString());
// }
UserSendThread userSendThread = new UserSendThread(list);
// 4、分配发送
Thread thread = new Thread(userSendThread,"线程："+i);
thread.start();
}
}
private static List<UserEntity> initUser() {
List<UserEntity> list = new ArrayList<UserEntity>();
for (int i = 0; i < 10; i++) {
list.add(new UserEntity("userId: "+i,"userName: "+i));
}
return list;
}
}
