小编Rom*_*kiy的帖子

我的任务是使用nginx实现微缓存策略，即缓存一些POST端点的响应几秒钟。

在http部分nginx.conf我有以下内容：

proxy_cache_path /tmp/cache keys_zone=cache:10m levels=1:2 inactive=600s max_size=100m;

然后我location有server：

    location /my-url/ {
      root dir;
      client_max_body_size 50k;
      proxy_cache cache;
      proxy_cache_valid 10s;
      proxy_cache_methods POST;
      proxy_cache_key "$request_uri|$request_body";
      proxy_ignore_headers Vary;

      add_header X-Cached $upstream_cache_status;

      proxy_pass http://my-upstream;
    }

该应用程序位于输出处，如果我理解正确的my-upstream话Cache-Control: max-age=10，应该使响应可缓存。

但是当我在短时间内（不到10秒）使用curl发出重复请求时

curl -v --data "a=b&c=d" https://my-host/my-url/1573

它们全部到达后端（根据后端日志）。还有，X-Cached总是MISS。

请求和响应如下：

> POST /my-url/1573 HTTP/1.1
> Host: my-host
> User-Agent: curl/7.47.0
> Accept: */*
> Content-Length: 113
> Content-Type: application/x-www-form-urlencoded
> 
* upload …

我有以下测试。

@Test
void withoutColon_fails() {
    ZonedDateTime.parse("2019-01-24T12:10:58.036820+0400");
}

@Test
void withColon_ok() {
    ZonedDateTime.parse("2019-01-24T12:10:58.036820+04:00");
}

我试图解析的日期时间之间的唯一区别是，在第一种情况下，时区指定的小时和分钟之间没有冒号，而在第二种情况下有一个冒号。

第一个失败：

java.time.format.DateTimeParseException: Text '2019-01-24T12:10:58.036820+0400' could not be parsed, unparsed text found at index 29

    at java.base/java.time.format.DateTimeFormatter.parseResolved0(DateTimeFormatter.java:2049)
    at java.base/java.time.format.DateTimeFormatter.parse(DateTimeFormatter.java:1948)
    at java.base/java.time.ZonedDateTime.parse(ZonedDateTime.java:598)
    at java.base/java.time.ZonedDateTime.parse(ZonedDateTime.java:583)

根据 javadoc, parse(), through DateTimeFormatter.ISO_ZONED_DATE_TIME, 最终使用DateTimeFormatter.ISO_OFFSET_DATE_TIME, 反过来，我们可以读到它是

ISO 日期时间格式化程序，用于格式化或解析具有偏移量的日期时间，例如“2011-12-03T10:15:30+01:00”。

进一步遵循 javadoc 链接，我们会看到ZoneOffset.getId()它表示它接受：

Z - for UTC (ISO-8601)
+hh:mm or -hh:mm - if the seconds are zero (ISO-8601)
+hh:mm:ss or -hh:mm:ss - if the seconds are non-zero (not ISO-8601) …

我在部署 Web 应用程序时遇到问题。我使用 maven + spring security 并且服务器不断报告以下问题：

错误：com.sun.tools.javac.code.Symbol$CompletionFailure：找不到 org.springframework.security.ldap.DefaultSpringSecurityContextSource 的类文件

这是我的 pom 文件和依赖项列表：

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>

    <groupId>com.online_exchange</groupId>
    <artifactId>online_exchange</artifactId>
    <version>1.0.0</version>
    <packaging>war</packaging>

    <name>online_exchange</name>

    <properties>
        <springframework.version>4.1.6.RELEASE</springframework.version>
        <springsecurity.version>4.0.1.RELEASE</springsecurity.version>
        <hibernate.version>4.3.6.Final</hibernate.version>
        <mysql.connector.version>5.1.31</mysql.connector.version>
    </properties>

    <dependencies>

        <!-- Spring -->
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-core</artifactId>
            <version>${springframework.version}</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-web</artifactId>
            <version>${springframework.version}</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-webmvc</artifactId>
            <version>${springframework.version}</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-tx</artifactId>
            <version>${springframework.version}</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-orm</artifactId>
            <version>${springframework.version}</version>
        </dependency>


        <!-- Spring Security -->
        <dependency>
            <groupId>org.springframework.security</groupId>
            <artifactId>spring-security-web</artifactId>
            <version>${springsecurity.version}</version>
        </dependency>
        <dependency>
            <groupId>org.springframework.security</groupId>
            <artifactId>spring-security-config</artifactId>
            <version>${springsecurity.version}</version>
        </dependency>

        <!-- Hibernate -->
        <dependency>
            <groupId>org.hibernate</groupId>
            <artifactId>hibernate-core</artifactId> …

我有一个简单的回声控制器

@RestController
public class EchoController {
    @GetMapping(path = "/param", produces = MediaType.TEXT_PLAIN_VALUE)
    String echoParam(@RequestParam("p") String paramValue) {
        return paramValue;
    }

    @GetMapping(path = "/path-variable/{val}", produces = MediaType.TEXT_PLAIN_VALUE)
    String echoPathVariable(@PathVariable("val") String val) {
        return val;
    }
}

它的一种方法与它所呈现的参数的值相呼应；第二个对通过 URI 提供的值执行相同的操作。

我有以下测试：

@Autowired
private WebTestClient webTestClient;

@Test
public void rawPlus_inQueryParam() {
    String value = "1+1";

    String response = getValueEchoedThroughQueryParam(value);

    assertThat(response, is(equalTo(value)));
}

@Test
public void urlencodedPlus_inQueryParam() {
    String value = "1%2B1";

    String response = getValueEchoedThroughQueryParam(value);

    assertThat(response, is(equalTo(value)));
}

private String getValueEchoedThroughQueryParam(String value) { …

我有以下工作配置.gitlab-ci.yml:

job1:
  stage: test
  services:
    - name: mariadb
      alias: mysql
      entrypoint: [""]
      command: [...]

  script:
    - ...

job2:
  stage: test
  services:
    - name: mariadb
      alias: mysql
      entrypoint: [""]
      command: [...]

  script:
    - ...

job3:
  stage: test
  services:
    - name: mariadb
      alias: mysql
      entrypoint: [""]
      command: [...]

  script:
    - ...

services 所有3个工作的部分相同.

是否有可能避免这种重复？

I have something like this:

@RestController
@RequestMapping("/{id}")
public class MyController {
    @GetMapping
    public String get(@PathVariable String id) {
        ...
    }

    @PostMapping
    public String post(@PathVariable String id, Payload payload) {
        ...
    }

    @GetMapping("/deeper/{id}")
    public String getDeeper(@PathVariable String id) {
        ....
    }
}

This gives 3 mappings:

• /{id} (GET)
• /{id} (POST)
• /{id}/deeper/{id} (GET)

I would like the third of them to be just /deeper/{id} (GET).

Is it possible to do this leaving the method in the same controller and leaving that …

我有一个简单的接口及其实现：

interface Iface {
    fun doSomething(s: String)
}

class IfaceImpl : Iface {
    override fun doSomething(s: String) {
        println("Doing the job, s = $s")
    }
}

此外，还有两个相同的（至少我看不出区别）调用处理程序，一个在 Java 中，一个在 Kotlin 中：

public class JavaHandler implements InvocationHandler {
    private final Iface target;

    public JavaHandler(Iface target) {
        this.target = target;
    }

    @Override
    public Object invoke(Object proxy, Method method, Object[] args) throws Throwable {
        System.out.println("Java handler works");
        return method.invoke(target, args);
    }
}

class KotlinHandler(private val target: Iface) : InvocationHandler {
    override fun invoke(proxy: …

我是编程的新手,我想问为什么在我的代码中我不需要在构造函数和方法中使用return函数？

另外为什么在使用yearPasses函数之后,年龄增加3而不是1？

为漫长的代码道歉

public class Person
{
    private int age;

    public Person(int initialAge)
    {
        // Add some more code to run some checks on initialAge
        if (initialAge<0)
        {
            System.out.println("Age is not valid, setting age to 0.");
            initialAge = 0;
            age = initialAge;
        }
        else
        {
            age = initialAge;
        }
    }

    public void amIOld()
    {
        if (age<13)
        {
            System.out.println("You are young.");
        }
        else if (age>=13 && age<18)
        {
            System.out.println("You are a teenager.");
        }
        else
        {
            System.out.println("You are old.");
        }
    }

    public …