目录
工作中能复用的技巧和代码，提高工作效率，成就美好人生！
0.建立SpringBoot工程
1.SpringBoot工程全局变量设置
打开工程路径src/main/resources/application.properties文件，定义变量 gVal = helloWorld。在类中通过如下方式引用。
@Value("${gVal}")
private String val;2.SpringBoot工程初始化函数
可以通过重写 ApplicationListener 类，也可以用定时器。
@Service
@EnableScheduling
public class InitService implements ApplicationListener<ContextRefreshedEvent> {
private String time;
public String getTime(){
return time;
}
//SpringBoot初始化服务
@Override
public void onApplicationEvent(ContextRefreshedEvent event) {
System.out.println(" init service running! ");
}
//定时器
@Scheduled(cron = "*/1 * * * * ?")
public void updateTime(){
SimpleDateFormat simpleDateFormat = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
time = simpleDateFormat.format(new Date());
}
}
3.不同类之间的引用
在其他服务类引用 InitService 类。
@Autowired
InitService initService;4.API接口定义，不同方式传递参数
@RestController
@CrossOrigin
public class Api {
@Autowired
InitService initService;
@Value("${gVal}")
private String val;
//输入 http://localhost:8080/get/val?s=123
//输出 helloWorld 123
@GetMapping("/get/val")
public String getVal(@RequestParam String s) {
return val + " " + s;
}
//输入 http://localhost:8080/get/json 在Postman添加Body: {"name":"peter","sex":1}
//输出 {"sex": 1,"name": "peter","time": "2022-04-12 21:24:46"}
@GetMapping("/get/json")
public JSONObject getJson(@RequestBody JSONObject json) {
json.put("time", initService.getTime());
return json;
}
}
5.Vue编译到SpringBoot工程的jar包
使用build命令编译vue工程，将生成的dist文件夹内的static文件夹和index.html文件拷贝到springboot工程的static文件夹下：
6.线程池的代码样例
import java.util.concurrent.*;
class ThreadPoolTest {
public void cachedThreadPool() {
ExecutorService threadPool = Executors.newCachedThreadPool();
for(int i=0;i<10;i++) {
threadPool.execute(()->{
while(true){
System.out.println(Thread.currentThread().getId());
try {
Thread.sleep(1000);
} catch (InterruptedException e) {
e.printStackTrace();
}
}
});
}
}
public void fixedThreadPool() {
ExecutorService threadPool = Executors.newFixedThreadPool(3);
for(int i=0;i<10;i++) {
int finalI = i;
threadPool.execute(()->{
int count = 5;
while(true){
System.out.println(Thread.currentThread().getId() + ":" + finalI);
if(0 == --count) {
break;
}
try {
Thread.sleep(1000);
} catch (InterruptedException e) {
e.printStackTrace();
}
}
});
}
}
public void scheduledThreadPool() {
ScheduledExecutorService scheduledExecutorService = Executors.newScheduledThreadPool(1);
scheduledExecutorService.scheduleAtFixedRate(()->{
System.out.println(Thread.currentThread().getId() + ":one second pass");
}, 0, 1, TimeUnit.SECONDS);
}
}
public class Main {
public static void main(String[] args) {
ThreadPoolTest threadPoolTest = new ThreadPoolTest();
threadPoolTest.scheduledThreadPool();
}
}7. http协议通信
import net.sf.json.JSONObject;
import org.springframework.http.ResponseEntity;
import org.springframework.web.client.RestTemplate;
public class http_test {
public JSONObject httpGet(){
RestTemplate rt = new RestTemplate();
String urlGet = "http://localhost:8886/Test/get";
ResponseEntity<JSONObject> response = rt.getForEntity(urlGet, JSONObject.class);
JSONObject body = response.getBody();
return body;
}
public JSONObject httpPost() {
JSONObject jobj = new JSONObject();
jobj.element("name","caoyi").element("password","123");
RestTemplate rt = new RestTemplate();
String urlGet = "http://localhost:8886/Test/set";
ResponseEntity<JSONObject> response = rt.postForEntity(urlGet, jobj, JSONObject.class);
JSONObject body = response.getBody();
return body;
}
public static void main(){
}
}8.使用mybatis
package com.cet34.cap.mapper;
import com.alibaba.fastjson.JSONObject;
import org.apache.ibatis.annotations.*;
import java.util.List;
@Mapper
public interface MysqlMapper {
@Update("CREATE TABLE all_data (\n" +
"`id` INT(32) NOT NULL AUTO_INCREMENT COMMENT '主键',\n" +
"`srcIp` VARCHAR(20) DEFAULT NULL COMMENT '源IP',\n" +
"`dstIp` VARCHAR(20) DEFAULT NULL COMMENT '目的IP',\n" +
"`srcPort` VARCHAR(10) DEFAULT NULL COMMENT '源端口',\n" +
"`dstPort` VARCHAR(10) DEFAULT NULL COMMENT '目的端口',\n" +
"`protocol` VARCHAR(10) DEFAULT NULL COMMENT '协议',\n" +
"`data` LONGTEXT DEFAULT NULL COMMENT '数据包内容',\n" +
"`time` VARCHAR(20) DEFAULT NULL COMMENT '数据包时间',\n" +
"PRIMARY KEY (`id`)\n" +
") ENGINE=INNODB DEFAULT CHARSET=utf8 COLLATE=utf8_bin")
void createTable();
@Select("SELECT COUNT(*) FROM information_schema.TABLES WHERE table_name ='#{tableName}'")
List<JSONObject> isExist(String tableName);
@Select("SELECT * FROM all_data")
List<JSONObject> selectAll();
@Select("SELECT * FROM all_data WHERE ${key} = #{value}")
List<JSONObject> select(String key, String value);
@Insert("INSERT INTO all_data VALUES (NULL,#{srcIp},#{dstIp},#{srcPort},#{dstPort},#{protocol},#{data},#{time})")
void insertData(String srcIp, String dstIp, String srcPort, String dstPort, String protocol, String data, String time);
@Update("UPDATE all_data set ${key}=#{value} where id = #{id}")
void updateData(String key, String value, int id);
@Delete("DELETE FROM all_data where id = #{id}")
void deleteData(int id);
}