@Configuration
class RouterRouterConfiguration {

    @Bean
    fun mainRouter(userHandler: UserHandler) = router {
        accept(TEXT_HTML).nest {
            GET("/") { ok().render("index") }
            GET("/sse") { ok().render("sse") }
            GET("/users", userHandler::findAllView)
        }
        "/api".nest {
            accept(APPLICATION_JSON).nest {
                GET("/users", userHandler::findAll)
            }
            accept(TEXT_EVENT_STREAM).nest {
                GET("/users", userHandler::stream)
            }
        }
        resources("/**", ClassPathResource("static/"))
    }
}

val mockMvc: MockMvc = ...
mockMvc.get("/person/{name}", "Lee") {
    secure = true
    accept = APPLICATION_JSON
    headers {
        contentLanguage = Locale.FRANCE
    }
    principal = Principal { "foo" }
}.andExpect {
    status { isOk }
    content { contentType(APPLICATION_JSON) }
    jsonPath("$.name") { value("Lee") }
    content { json("""{"someBoolean": false}""", false) }
}.andDo {
    print()
}

dependencies {
        runtime("org.jetbrains.kotlin:kotlin-scripting-jsr223:${kotlinVersion}")
}

@Configuration
class KotlinScriptConfiguration {

    @Bean
    fun kotlinScriptConfigurer() = ScriptTemplateConfigurer().apply {
        engineName = "kotlin"
        setScripts("scripts/render.kts")
        renderFunction = "render"
        isSharedEngine = false
    }

    @Bean
    fun kotlinScriptViewResolver() = ScriptTemplateViewResolver().apply {
        setPrefix("templates/")
        setSuffix(".kts")
    }
}

dependencies {

    implementation("org.jetbrains.kotlinx:kotlinx-coroutines-core:${coroutinesVersion}")
    implementation("org.jetbrains.kotlinx:kotlinx-coroutines-reactor:${coroutinesVersion}")
}

@RestController
class CoroutinesRestController(client: WebClient, banner: Banner) {

    @GetMapping("/suspend")
    suspend fun suspendingEndpoint(): Banner {
        delay(10)
        return banner
    }

    @GetMapping("/flow")
    fun flowEndpoint() = flow {
        delay(10)
        emit(banner)
        delay(10)
        emit(banner)
    }

    @GetMapping("/deferred")
    fun deferredEndpoint() = GlobalScope.async {
        delay(10)
        banner
    }

    @GetMapping("/sequential")
    suspend fun sequential(): List<Banner> {
        val banner1 = client
                .get()
                .uri("/suspend")
                .accept(MediaType.APPLICATION_JSON)
                .awaitExchange()
                .awaitBody<Banner>()
        val banner2 = client
                .get()
                .uri("/suspend")
                .accept(MediaType.APPLICATION_JSON)
                .awaitExchange()
                .awaitBody<Banner>()
        return listOf(banner1, banner2)
    }

    @GetMapping("/parallel")
    suspend fun parallel(): List<Banner> = coroutineScope {
        val deferredBanner1: Deferred<Banner> = async {
            client
                    .get()
                    .uri("/suspend")
                    .accept(MediaType.APPLICATION_JSON)
                    .awaitExchange()
                    .awaitBody<Banner>()
        }
        val deferredBanner2: Deferred<Banner> = async {
            client
                    .get()
                    .uri("/suspend")
                    .accept(MediaType.APPLICATION_JSON)
                    .awaitExchange()
                    .awaitBody<Banner>()
        }
        listOf(deferredBanner1.await(), deferredBanner2.await())
    }

    @GetMapping("/error")
    suspend fun error() {
        throw IllegalStateException()
    }

    @GetMapping("/cancel")
    suspend fun cancel() {
        throw CancellationException()
    }

}

@Controller
class CoroutinesViewController(banner: Banner) {

    @GetMapping("/")
    suspend fun render(model: Model): String {
        delay(10)
        model["banner"] = banner
        return "index"
    }
}

@Configuration
class RouterConfiguration {

    @Bean
    fun mainRouter(userHandler: UserHandler) = coRouter {
        GET("/", userHandler::listView)
        GET("/api/user", userHandler::listApi)
    }
}

class UserHandler(builder: WebClient.Builder) {

    private val client = builder.baseUrl("...").build()

    suspend fun listView(request: ServerRequest): ServerResponse =
            ServerResponse.ok().renderAndAwait("users", mapOf("users" to
            client.get().uri("...").awaitExchange().awaitBody<User>()))

    suspend fun listApi(request: ServerRequest): ServerResponse =
                ServerResponse.ok().contentType(MediaType.APPLICATION_JSON).bodyAndAwait(
                client.get().uri("...").awaitExchange().awaitBody<User>())
}

import org.springframework.transaction.reactive.executeAndAwait

class PersonRepository(private val operator: TransactionalOperator) {

    suspend fun initDatabase() = operator.executeAndAwait {
        insertPerson1()
        insertPerson2()
    }

    private suspend fun insertPerson1() {
        // INSERT SQL statement
    }

    private suspend fun insertPerson2() {
        // INSERT SQL statement
    }
}

import org.springframework.transaction.reactive.transactional

class PersonRepository(private val operator: TransactionalOperator) {

    fun updatePeople() = findPeople().map(::updatePerson).transactional(operator)

    private fun findPeople(): Flow<Person> {
        // SELECT SQL statement
    }

    private suspend fun updatePerson(person: Person): Person {
        // UPDATE SQL statement
    }
}

class Person(val name: String, val age: Int)

data class Person(val name: String, val age: Int)

val jack = Person(name = "Jack", age = 1)
val olderJack = jack.copy(age = 2)

@Component
class YourBean(
    private val mongoTemplate: MongoTemplate,
    private val solrClient: SolrClient
)

@Component
class YourBean {

    @Autowired
    lateinit var mongoTemplate: MongoTemplate

    @Autowired
    lateinit var solrClient: SolrClient
}

@Bean
fun propertyConfigurer() = PropertySourcesPlaceholderConfigurer().apply {
    setPlaceholderPrefix("%{")
}

@Bean
fun kotlinPropertyConfigurer() = PropertySourcesPlaceholderConfigurer().apply {
    setPlaceholderPrefix("%{")
    setIgnoreUnresolvablePlaceholders(true)
}

@Bean
fun defaultPropertyConfigurer() = PropertySourcesPlaceholderConfigurer()

public @interface RequestMapping {

    @AliasFor("path")
    String[] value() default {};

    @AliasFor("value")
    String[] path() default {};

    RequestMethod[] method() default {};

    // ...
}

package org.springframework.scripting;

public interface Calculator {

    int add(int x, int y);
}

// from the file 'calculator.groovy'
package org.springframework.scripting.groovy

class GroovyCalculator implements Calculator {

    int add(int x, int y) {
        x + y
    }
}

<!-- from the file 'beans.xml' -->
<beans>
    <lang:groovy id="calculator" script-source="classpath:calculator.groovy"/>
</beans>

package org.springframework.scripting;

import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

public class Main {

    public static void main(String[] args) {
        ApplicationContext ctx = new ClassPathXmlApplicationContext("beans.xml");
        Calculator calc = ctx.getBean("calculator", Calculator.class);
        System.out.println(calc.add(2, 8));
    }
}

BeanShell 是一个小型、免费、可嵌入的 Java 源代码解释器，具有动态语言
功能，用Java编写。BeanShell 动态运行标准 Java 语法和
使用常见的脚本便利性对其进行扩展，例如松散类型、命令和方法
Perl 和 JavaScript 中的闭包。

package org.springframework.scripting;

public interface Messenger {

    String getMessage();
}

String message;

String getMessage() {
    return message;
}

void setMessage(String aMessage) {
    message = aMessage;
}

<lang:bsh id="messageService" script-source="classpath:BshMessenger.bsh"
    script-interfaces="org.springframework.scripting.Messenger">

    <lang:property name="message" value="Hello World!" />
</lang:bsh>

// from the file '/WEB-INF/groovy/FortuneController.groovy'
package org.springframework.showcase.fortune.web

import org.springframework.showcase.fortune.service.FortuneService
import org.springframework.showcase.fortune.domain.Fortune
import org.springframework.web.servlet.ModelAndView
import org.springframework.web.servlet.mvc.Controller

import javax.servlet.http.HttpServletRequest
import javax.servlet.http.HttpServletResponse

class FortuneController implements Controller {

    @Property FortuneService fortuneService

    ModelAndView handleRequest(HttpServletRequest request,
            HttpServletResponse httpServletResponse) {
        return new ModelAndView("tell", "fortune", this.fortuneService.tellFortune())
    }
}

<lang:groovy id="fortune"
        refresh-check-delay="3000"
        script-source="/WEB-INF/groovy/FortuneController.groovy">
    <lang:property name="fortuneService" ref="fortuneService"/>
</lang:groovy>

import org.springframework.validation.Validator
import org.springframework.validation.Errors
import org.springframework.beans.TestBean

class TestBeanValidator implements Validator {

    boolean supports(Class clazz) {
        return TestBean.class.isAssignableFrom(clazz)
    }

    void validate(Object bean, Errors errors) {
        if(bean.name?.trim()?.size() > 0) {
            return
        }
        errors.reject("whitespace", "Cannot be composed wholly of whitespace.")
    }
}

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xmlns:lang="http://www.springframework.org/schema/lang"
    xsi:schemaLocation="
        http://www.springframework.org/schema/beans https://www.springframework.org/schema/beans/spring-beans.xsd
        http://www.springframework.org/schema/lang https://www.springframework.org/schema/lang/spring-lang.xsd">

    <lang:groovy id="messenger" script-source="classpath:Messenger.groovy" scope="prototype">
        <lang:property name="message" value="I Can Do The RoboCop" />
    </lang:groovy>

    <bean id="bookingService" class="x.y.DefaultBookingService">
        <property name="messenger" ref="messenger" />
    </bean>

</beans>

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xmlns:lang="http://www.springframework.org/schema/lang"
    xsi:schemaLocation="
        http://www.springframework.org/schema/beans https://www.springframework.org/schema/beans/spring-beans.xsd
        http://www.springframework.org/schema/lang https://www.springframework.org/schema/lang/spring-lang.xsd">

    <!-- bean definitions here -->

</beans>