小编Mic*_*ael的帖子

我不明白为什么我们使用劫持,因为我可以直接在响应体中写一些东西,有人可以解释一下吗？

func writeSome(w http.ResponseWriter, r *http.Request) {
    fmt.Fprintf(w, "write some thing")
}

它与此相同:

func hijack(w http.ResponseWriter, r *http.Request) {
    hj, _ := w.(http.Hijacker)
    _, buf, _ := hj.Hijack()
    buf.WriteString("write some thing")
    buf.Flush()
}

我很迷惑

我已经阅读了各种文章,但我仍然不知道为什么不应该使用instanceof.kindlylet我知道你的想法.

我正在尝试将String传递给我BufferedReader.我如何通过"测试" String而不是输入System.in？

String test = "test";
BufferedReader inFromUser = new BufferedReader(new InputStreamReader(System.in));

我们使用Powermockito和Mockito来模拟一些静态类.似乎java.lang.ExceptionInInitializerError每次都会抛出.

你能帮我找出问题所在吗？

正在测试的Java类

package com.myproject.myproduct.search.domain;
import org.elasticsearch.index.query.MultiMatchQueryBuilder;
import org.elasticsearch.index.query.QueryBuilders;

public class MyQueryBuilder {

    public MultiMatchQueryBuilder getMultiMatchQueryBuilder() {
        MultiMatchQueryBuilder builder = QueryBuilders.multiMatchQuery("term", "field1");
        builder.field("field1",200.9f);
        return builder;
    }
}

使用Powermock跑步者进行Junit测试

package com.myproject.myproduct.search.domain;

import org.elasticsearch.index.query.MultiMatchQueryBuilder;
import org.elasticsearch.index.query.QueryBuilders;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.powermock.api.mockito.PowerMockito;
import org.powermock.core.classloader.annotations.PrepareForTest;
import org.powermock.modules.junit4.PowerMockRunner;

@RunWith(PowerMockRunner.class)
@PrepareForTest(QueryBuilders.class)
public class MyQueryBuilderTest {

    private MyQueryBuilder myQueryBuilder;

    @Test
    public void test() {
        PowerMockito.mockStatic(QueryBuilders.class);
        MultiMatchQueryBuilder builder = PowerMockito.mock(MultiMatchQueryBuilder.class);
    }
}

而已.一旦我尝试模拟MultiMatchQueryBuilder,测试代码就无法运行.

这是例外:

位于org.elasticsearch.index.query.AbstractQueryBuilder的org.elasticsearch.common.ParseField.(ParseField.java:35)的org.elasticsearch.common.logging.DeprecationLogger.(DeprecationLogger.java:138)中的java.lang.ExceptionInInitializerError. (AbstractQueryBuilder.java:53)在sun.reflect.GeneratedSerializationConstructorAccessor7.newInstance(未知来源)在java.lang.reflect.Constructor.newInstance(Constructor.java:423)在org.objenesis.instantiator.sun.SunReflectionFactoryInstantiator.newInstance(SunReflectionFactoryInstantiator的.java:40)在org.objenesis.ObjenesisBase.newInstance(ObjenesisBase.java:59)在org.mockito.internal.creation.jmock.ClassImposterizer.createProxy(ClassImposterizer.java:128)在org.mockito.internal.creation. jmock.ClassImposterizer.imposterise(ClassImposterizer.java:63)atg.powermock.api.mockito.internal.mockcreation.MockCreator.createMethodInvocationControl(MockCreator.java:111)org.powermock.api.mockito.internal.mockcreation.MockCreator.模拟(MockCreator.java:6 0)在org.powermock.api.mockito.PowerMockito.mock(PowerMockito.java:143)的com.spartasystems.stratas.search.domain.MyQueryBuilderTest.testBoostSetProperly(MyQueryBuilderTest.java:22)at sun.reflect.NativeMethodAccessorImpl.invoke0 (本地方法)at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)at java.lang.reflect.Method.invoke(Method.java:498) )在org.junit的org.junit.internal.runners.TestMethod.invoke(TestMethod.java:68)org.powermock.modules.junit4.internal.impl.PowerMockJUnit44RunnerDelegateImpl $ …

import java.util.Scanner;
class MyClass
{
    public static void main(String args[])
    {
        Scanner scanner = new Scanner(System.in);
        int employeeId, supervisorId;
        String name;
        System.out.println("Enter employee ID:");
        employeeId = scanner.nextInt();
        System.out.println("Enter employee name:");
        name = scanner.next();
        System.out.println("Enter supervisor ID:");
        supervisorId = scanner.nextInt();
    }
}

我在尝试输入名字和姓氏时遇到了这个异常.

Enter employee ID:
101
Enter employee name:
firstname lastname
Enter supervisor ID:
Exception in thread "main" java.util.InputMismatchException
    at java.util.Scanner.throwFor(Unknown Source)
    at java.util.Scanner.next(Unknown Source)
    at java.util.Scanner.nextInt(Unknown Source)
    at java.util.Scanner.nextInt(Unknown Source)
    at com.controller.Menu.<init>(Menu.java:61)
    at com.tests.Employeetest.main(Employeetest.java:17)

但如果我只输入名字,它的工作.

Enter employee ID:
105 …

这是我的示例代码.查询编码为UTF-8:

HttpRequest request = HttpRequest.newBuilder()
    .header("content-type", "application/json;charset=UTF-8")
    .uri(URI.create("http://localhost:8080/test?param1=test%C5%84"))
    .GET()
    .build();

HttpClient.newBuilder()
    .version(HttpClient.Version.HTTP_2)
    .build()
    .send(request, HttpResponse.BodyHandler.asString(Charset.forName("UTF-8")));

运行此示例后,我得到以下异常:

java.lang.IllegalArgumentException: char=324
at jdk.incubator.httpclient/jdk.incubator.http.internal.hpack.Huffman.codeOf(Huffman.java:559)
at jdk.incubator.httpclient/jdk.incubator.http.internal.hpack.Huffman.lengthOf(Huffman.java:524)
at jdk.incubator.httpclient/jdk.incubator.http.internal.hpack.StringWriter.configure(StringWriter.java:79)
at jdk.incubator.httpclient/jdk.incubator.http.internal.hpack.StringWriter.configure(StringWriter.java:62)
at jdk.incubator.httpclient/jdk.incubator.http.internal.hpack.IndexNameValueWriter.value(IndexNameValueWriter.java:64)
at jdk.incubator.httpclient/jdk.incubator.http.internal.hpack.Encoder.literal(Encoder.java:422)
at jdk.incubator.httpclient/jdk.incubator.http.internal.hpack.Encoder.header(Encoder.java:245)
at jdk.incubator.httpclient/jdk.incubator.http.internal.hpack.Encoder.header(Encoder.java:198)
at jdk.incubator.httpclient/jdk.incubator.http.Http2Connection.encodeHeadersImpl(Http2Connection.java:927)
at jdk.incubator.httpclient/jdk.incubator.http.Http2Connection.encodeHeaders(Http2Connection.java:878)
at jdk.incubator.httpclient/jdk.incubator.http.Http2Connection.encodeHeaders(Http2Connection.java:951)
at jdk.incubator.httpclient/jdk.incubator.http.Http2Connection.sendFrame(Http2Connection.java:984)
at jdk.incubator.httpclient/jdk.incubator.http.Stream.sendHeadersAsync(Stream.java:547)
at jdk.incubator.httpclient/jdk.incubator.http.Exchange.lambda$responseAsyncImpl0$8(Exchange.java:322)
at java.base/java.util.concurrent.CompletableFuture$UniCompose.tryFire(CompletableFuture.java:1072)
at java.base/java.util.concurrent.CompletableFuture.postComplete(CompletableFuture.java:506)
at java.base/java.util.concurrent.CompletableFuture.complete(CompletableFuture.java:2073)
at jdk.incubator.httpclient/jdk.incubator.http.internal.common.SSLFlowDelegate.setALPN(SSLFlowDelegate.java:164)
at jdk.incubator.httpclient/jdk.incubator.http.internal.common.SSLFlowDelegate.access$200(SSLFlowDelegate.java:81)
at jdk.incubator.httpclient/jdk.incubator.http.internal.common.SSLFlowDelegate$Reader.processData(SSLFlowDelegate.java:340)
at jdk.incubator.httpclient/jdk.incubator.http.internal.common.SSLFlowDelegate$Reader$ReaderDownstreamPusher.run(SSLFlowDelegate.java:215)
at jdk.incubator.httpclient/jdk.incubator.http.internal.common.SequentialScheduler$SynchronizedRestartableTask.run(SequentialScheduler.java:175)
at jdk.incubator.httpclient/jdk.incubator.http.internal.common.SequentialScheduler$CompleteRestartableTask.run(SequentialScheduler.java:147)
at jdk.incubator.httpclient/jdk.incubator.http.internal.common.SequentialScheduler$TryEndDeferredCompleter.complete(SequentialScheduler.java:315)
at jdk.incubator.httpclient/jdk.incubator.http.internal.common.SequentialScheduler$CompleteRestartableTask.run(SequentialScheduler.java:149)
at jdk.incubator.httpclient/jdk.incubator.http.internal.common.SequentialScheduler$SchedulableTask.run(SequentialScheduler.java:198)
at jdk.incubator.httpclient/jdk.incubator.http.internal.common.SequentialScheduler.runOrSchedule(SequentialScheduler.java:271)
at jdk.incubator.httpclient/jdk.incubator.http.internal.common.SequentialScheduler.runOrSchedule(SequentialScheduler.java:224)
at jdk.incubator.httpclient/jdk.incubator.http.internal.common.SSLFlowDelegate$Reader.incoming(SSLFlowDelegate.java:242)
at jdk.incubator.httpclient/jdk.incubator.http.internal.common.SubscriberWrapper.incomingCaller(SubscriberWrapper.java:388)
at jdk.incubator.httpclient/jdk.incubator.http.internal.common.SubscriberWrapper.onNext(SubscriberWrapper.java:343) …

在Java 8，给出一个超类Super的包a和一个子类Sub的包b，谁拥有一个内部类SubInner：

// Super.java
package a;

public abstract class Super {
   private long value;
   protected final void setValue(long value) {
      this.value = value;
   }
}

//Sub.java
package b;

public class Sub extends Super {
  public void foo() {
    new SubInner().foo();
  }
  private class SubInner {
    void foo() {
      Optional.of(1L).ifPresent(Sub.this::setValue); // Will throw IllegalAccessError at runtime.
      Optional.of(1L).ifPresent(t -> setValue(t)); // However, lambda works.
      setValue(1L); // also works.
    }
  }
}

我的问题是，为什么在正常方法调用可以访问超类方法的情况下，方法引用在这种情况下无法工作 …

我正在尝试将此处找到的az_AZ_#LatnString转换为区域设置，但我无法解析该部分。#Latn

如果我这样做，new Locale("az_AZ_#Latn")我会丢失该#Latn部分（脚本代码）。

我也尝试过使用LocaleUtilsfrom commons-lang 但收到一条错误消息，指出它是无效格式。

Lombok.val允许你

使用val作为局部变量声明的类型,而不是实际写入类型.执行此操作时,将从初始化表达式推断出类型.局部变量也将成为最终变量.

而不是

final ArrayList<String> example = new ArrayList<String>();

你可以写

val example = new ArrayList<String>();

我试图对这实际上是如何工作进行一些研究,但似乎没有大量的信息.看一下github页面,我可以看到它val是一个注释类型.然后使用注释类型,而不是实际注释.

我甚至不知道你甚至可以用这种方式使用注释类型,但在测试它时,下面的代码确实有效.但是,我仍然不确定为什么你会想要以这种方式使用该类型.

public class Main
{
    public @interface Foo { }

    public static void main(String... args)
    {       
        Foo bar;
        System.out.println("End");
    }
}

如果Lombok不是注释,而是注释类型,它们如何处理这些用法？对于我(显然不正确)的理解,语法看起来应该更像:

@Val foo = new ArrayList<String>();

(我知道注释的约束意味着上面的语法不是有效的)

List<List<String>> superlist = new ArrayList<List<String>>();

List<String> list1 = new ArrayList<String>();
list1.add("a1");
list1.add("a2");

List<String> list2 = new ArrayList<String>();
list2.add("b1");
list2.add("b2");

List<String> list3= new ArrayList<String>();
list3.add("c1");
list3.add("c2");

superlist.add(list1);
superlist.add(list2);
superlist.add(list3);

List<String> result= new ArrayList<>();

现在我想创建一个包含所有值的新列表superList.这里的结果应该包含a1,a2,b1,b2,c1,c2