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SpringBoot性能太差?試試這幾招!

今天這篇文章介紹七種常見(jiàn)的Spring Boot 性能優(yōu)化方向。

目前成都創(chuàng)新互聯(lián)公司已為1000+的企業(yè)提供了網(wǎng)站建設(shè)、域名、網(wǎng)絡(luò)空間、網(wǎng)站運(yùn)營(yíng)、企業(yè)網(wǎng)站設(shè)計(jì)、朝陽(yáng)網(wǎng)站維護(hù)等服務(wù),公司將堅(jiān)持客戶(hù)導(dǎo)向、應(yīng)用為本的策略,正道將秉承"和諧、參與、激情"的文化,與客戶(hù)和合作伙伴齊心協(xié)力一起成長(zhǎng),共同發(fā)展。

1. 異步執(zhí)行

實(shí)現(xiàn)方式二種:

  • 使用異步注解@Aysnc?、啟動(dòng)類(lèi):添加@EnableAsync 注解。
  • JDK 8 本身有一個(gè)非常好用的 Future 類(lèi)——CompletableFuture。
@AllArgsConstructor  
public class AskThread implements Runnable{
private CompletableFuture re = null;

public void run() {
int myRe = 0;
try {
myRe = re.get() * re.get();
} catch (Exception e) {
e.printStackTrace();
}
System.out.println(myRe);
}

public static void main(String[] args) throws InterruptedException {
final CompletableFuture future = new CompletableFuture<>();
new Thread(new AskThread(future)).start();
//模擬長(zhǎng)時(shí)間的計(jì)算過(guò)程
Thread.sleep(1000);
//告知完成結(jié)果
future.complete(60);
}
}

在該示例中,啟動(dòng)一個(gè)線程,此時(shí) AskThread? 對(duì)象還沒(méi)有拿到它需要的數(shù)據(jù),執(zhí)行到 myRe = re.get() * re.get() 會(huì)阻塞。

我們用休眠 1 秒來(lái)模擬一個(gè)長(zhǎng)時(shí)間的計(jì)算過(guò)程,并將計(jì)算結(jié)果告訴 future? 執(zhí)行結(jié)果,AskThread 線程將會(huì)繼續(xù)執(zhí)行。

public class Calc {  
public static Integer calc(Integer para) {
try {
//模擬一個(gè)長(zhǎng)時(shí)間的執(zhí)行
Thread.sleep(1000);
} catch (InterruptedException e) {
e.printStackTrace();
}
return para * para;
}

public static void main(String[] args) throws ExecutionException, InterruptedException {
final CompletableFuture future = CompletableFuture.supplyAsync(() -> calc(50))
.thenApply((i) -> Integer.toString(i))
.thenApply((str) -> "\"" + str + "\"")
.thenAccept(System.out::println);
future.get();
}
}

CompletableFuture.supplyAsync? 方法構(gòu)造一個(gè) CompletableFuture? 實(shí)例,在 supplyAsync() 方法中,它會(huì)在一個(gè)新線程中,執(zhí)行傳入的參數(shù)。

在這里它會(huì)執(zhí)行 calc()? 方法,這個(gè)方法可能是比較慢的,但這并不影響 CompletableFuture? 實(shí)例的構(gòu)造速度,supplyAsync() 會(huì)立即返回。

而返回的 CompletableFuture 實(shí)例就可以作為這次調(diào)用的契約,在將來(lái)任何場(chǎng)合,用于獲得最終的計(jì)算結(jié)果。

supplyAsync? 用于提供返回值的情況,CompletableFuture? 還有一個(gè)不需要返回值的異步調(diào)用方法 runAsync(Runnable runnable)?,一般我們?cè)趦?yōu)化 Controller 時(shí),使用這個(gè)方法比較多。

這兩個(gè)方法如果在不指定線程池的情況下,都是在 ForkJoinPool.common 線程池中執(zhí)行,而這個(gè)線程池中的所有線程都是 Daemon(守護(hù))線程,所以,當(dāng)主線程結(jié)束時(shí),這些線程無(wú)論執(zhí)行完畢都會(huì)退出系統(tǒng)。

核心代碼:

CompletableFuture.runAsync(() ->  
this.afterBetProcessor(betRequest,betDetailResult,appUser,id)
);

異步調(diào)用使用 Callable 來(lái)實(shí)現(xiàn):

@RestController    
public class HelloController {

private static final Logger logger = LoggerFactory.getLogger(HelloController.class);

@Autowired
private HelloService hello;

@GetMapping("/helloworld")
public String helloWorldController() {
return hello.sayHello();
}

/**
* 異步調(diào)用restful
* 當(dāng)controller返回值是Callable的時(shí)候,springmvc就會(huì)啟動(dòng)一個(gè)線程將Callable交給TaskExecutor去處理
* 然后DispatcherServlet還有所有的spring攔截器都退出主線程,然后把response保持打開(kāi)的狀態(tài)
* 當(dāng)Callable執(zhí)行結(jié)束之后,springmvc就會(huì)重新啟動(dòng)分配一個(gè)request請(qǐng)求,然后DispatcherServlet就重新
* 調(diào)用和處理Callable異步執(zhí)行的返回結(jié)果, 然后返回視圖
*
* @return
*/
@GetMapping("/hello")
public Callable helloController() {
logger.info(Thread.currentThread().getName() + " 進(jìn)入helloController方法");
Callable callable = new Callable() {

@Override
public String call() throws Exception {
logger.info(Thread.currentThread().getName() + " 進(jìn)入call方法");
String say = hello.sayHello();
logger.info(Thread.currentThread().getName() + " 從helloService方法返回");
return say;
}
};
logger.info(Thread.currentThread().getName() + " 從helloController方法返回");
return callable;
}
}

異步調(diào)用的方式 WebAsyncTask:

@RestController    
public class HelloController {

private static final Logger logger = LoggerFactory.getLogger(HelloController.class);

@Autowired
private HelloService hello;

/**
* 帶超時(shí)時(shí)間的異步請(qǐng)求 通過(guò)WebAsyncTask自定義客戶(hù)端超時(shí)間
*
* @return
*/
@GetMapping("/world")
public WebAsyncTask worldController() {
logger.info(Thread.currentThread().getName() + " 進(jìn)入helloController方法");

// 3s鐘沒(méi)返回,則認(rèn)為超時(shí)
WebAsyncTask webAsyncTask = new WebAsyncTask<>(3000, new Callable() {

@Override
public String call() throws Exception {
logger.info(Thread.currentThread().getName() + " 進(jìn)入call方法");
String say = hello.sayHello();
logger.info(Thread.currentThread().getName() + " 從helloService方法返回");
return say;
}
});
logger.info(Thread.currentThread().getName() + " 從helloController方法返回");

webAsyncTask.onCompletion(new Runnable() {

@Override
public void run() {
logger.info(Thread.currentThread().getName() + " 執(zhí)行完畢");
}
});

webAsyncTask.onTimeout(new Callable() {

@Override
public String call() throws Exception {
logger.info(Thread.currentThread().getName() + " onTimeout");
// 超時(shí)的時(shí)候,直接拋異常,讓外層統(tǒng)一處理超時(shí)異常
throw new TimeoutException("調(diào)用超時(shí)");
}
});
return webAsyncTask;
}

/**
* 異步調(diào)用,異常處理,詳細(xì)的處理流程見(jiàn)MyExceptionHandler類(lèi)
*
* @return
*/
@GetMapping("/exception")
public WebAsyncTask exceptionController() {
logger.info(Thread.currentThread().getName() + " 進(jìn)入helloController方法");
Callable callable = new Callable() {

@Override
public String call() throws Exception {
logger.info(Thread.currentThread().getName() + " 進(jìn)入call方法");
throw new TimeoutException("調(diào)用超時(shí)!");
}
};
logger.info(Thread.currentThread().getName() + " 從helloController方法返回");
return new WebAsyncTask<>(20000, callable);
}

}

2. 增加內(nèi)嵌 Tomcat 的最大連接數(shù)

代碼如下:

@Configuration  
public class TomcatConfig {
@Bean
public ConfigurableServletWebServerFactory webServerFactory() {
TomcatServletWebServerFactory tomcatFactory = new TomcatServletWebServerFactory();
tomcatFactory.addConnectorCustomizers(new MyTomcatConnectorCustomizer());
tomcatFactory.setPort(8005);
tomcatFactory.setContextPath("/api-g");
return tomcatFactory;
}
class MyTomcatConnectorCustomizer implements TomcatConnectorCustomizer {
public void customize(Connector connector) {
Http11NioProtocol protocol = (Http11NioProtocol) connector.getProtocolHandler();
//設(shè)置最大連接數(shù)
protocol.setMaxConnections(20000);
//設(shè)置最大線程數(shù)
protocol.setMaxThreads(2000);
protocol.setConnectionTimeout(30000);
}
}

}

3. 使用 @ComponentScan()

使用 @ComponentScan()? 定位掃包比 @SpringBootApplication 掃包更快。

4. 默認(rèn) Tomcat 容器改為 Undertow

默認(rèn) Tomcat 容器改為 Undertow(Jboss 下的服務(wù)器,Tomcat 吞吐量 5000,Undertow 吞吐量 8000)

  

org.springframework.boot
spring-boot-starter-tomcat

改為:

  
org.springframework.boot
spring-boot-starter-undertow

5. 使用 BufferedWriter 進(jìn)行緩沖

這里不給大家舉例,可自行嘗試。

6. Deferred 方式實(shí)現(xiàn)異步調(diào)用

代碼如下:

@RestController  
public class AsyncDeferredController {
private final Logger logger = LoggerFactory.getLogger(this.getClass());
private final LongTimeTask taskService;

@Autowired
public AsyncDeferredController(LongTimeTask taskService) {
this.taskService = taskService;
}

@GetMapping("/deferred")
public DeferredResult executeSlowTask() {
logger.info(Thread.currentThread().getName() + "進(jìn)入executeSlowTask方法");
DeferredResult deferredResult = new DeferredResult<>();
// 調(diào)用長(zhǎng)時(shí)間執(zhí)行任務(wù)
taskService.execute(deferredResult);
// 當(dāng)長(zhǎng)時(shí)間任務(wù)中使用deferred.setResult("world");這個(gè)方法時(shí),會(huì)從長(zhǎng)時(shí)間任務(wù)中返回,繼續(xù)controller里面的流程
logger.info(Thread.currentThread().getName() + "從executeSlowTask方法返回");
// 超時(shí)的回調(diào)方法
deferredResult.onTimeout(new Runnable(){

@Override
public void run() {
logger.info(Thread.currentThread().getName() + " onTimeout");
// 返回超時(shí)信息
deferredResult.setErrorResult("time out!");
}
});

// 處理完成的回調(diào)方法,無(wú)論是超時(shí)還是處理成功,都會(huì)進(jìn)入這個(gè)回調(diào)方法
deferredResult.onCompletion(new Runnable(){

@Override
public void run() {
logger.info(Thread.currentThread().getName() + " onCompletion");
}
});

return deferredResult;
}
}

7. 異步調(diào)用可以使用 AsyncHandlerInterceptor 進(jìn)行攔截

代碼如下:

@Component  
public class MyAsyncHandlerInterceptor implements AsyncHandlerInterceptor {

private static final Logger logger = LoggerFactory.getLogger(MyAsyncHandlerInterceptor.class);

@Override
public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler)
throws Exception {
return true;
}

@Override
public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler,
ModelAndView modelAndView) throws Exception {
// HandlerMethod handlerMethod = (HandlerMethod) handler;
logger.info(Thread.currentThread().getName()+ "服務(wù)調(diào)用完成,返回結(jié)果給客戶(hù)端");
}

@Override
public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex)
throws Exception {
if(null != ex){
System.out.println("發(fā)生異常:"+ex.getMessage());
}
}

@Override
public void afterConcurrentHandlingStarted(HttpServletRequest request, HttpServletResponse response, Object handler)
throws Exception {

// 攔截之后,重新寫(xiě)回?cái)?shù)據(jù),將原來(lái)的hello world換成如下字符串
String resp = "my name is chhliu!";
response.setContentLength(resp.length());
response.getOutputStream().write(resp.getBytes());

logger.info(Thread.currentThread().getName() + " 進(jìn)入afterConcurrentHandlingStarted方法");
}

}


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