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Roman's questions

Martin Hope
Roman
Asked: 2022-08-09 15:14:27 +0800 CST
  • 0

我正在尝试从天气 apishka 获得响应 apishka 向城市坐标请求发送这样的响应

[
    {
        "name": "Moscow",
        "local_names": {
            "it": "Mosca",
            "zh": "莫斯科",
            "lv": "Maskava",
            "id": "Moskwa",
            "ay": "Mosku",
            "lt": "Maskva",
            "ascii": "Moscow",
            "sh": "Moskva",
            "uz": "Moskva",
            "st": "Moscow",
            "co": "Moscù",
            "bo": "མོ་སི་ཁོ།",
            "fi": "Moskova",
            "wo": "Mosku",
            "dz": "མོསི་ཀོ",
            "sl": "Moskva",
            "ps": "مسکو",
            "sc": "Mosca",
            "hr": "Moskva",
            "kv": "Мӧскуа",
            "tk": "Moskwa",
            "sr": "Москва",
            "mg": "Moskva",
            "ko": "모스크바",
            "wa": "Moscou",
            "sg": "Moscow",
            "sv": "Moskva",
            "ch": "Moscow",
            "mn": "Москва",
            "ta": "மாஸ்கோ",
            "am": "ሞስኮ",
            "an": "Moscú",
            "io": "Moskva",
            "su": "Moskwa",
            "ro": "Moscova",
            "oc": "Moscòu",
            "feature_name": "Moscow",
            "bg": "Москва",
            "nn": "Moskva",
            "en": "Moscow",
            "li": "Moskou",
            "ga": "Moscó",
            "ak": "Moscow",
            "ba": "Мәскәү",
            "da": "Moskva",
            "so": "Moskow",
            "ru": "Москва",
            "be": "Масква",
            "is": "Moskva",
            "eo": "Moskvo",
            "cu": "Москъва",
            "uk": "Москва",
            "cs": "Moskva",
            "sk": "Moskva",
            "vo": "Moskva",
            "ab": "Москва",
            "qu": "Moskwa",
            "kg": "Moskva",
            "cy": "Moscfa",
            "az": "Moskva",
            "pl": "Moskwa",
            "jv": "Moskwa",
            "fo": "Moskva",
            "ia": "Moscova",
            "lg": "Moosko",
            "hu": "Moszkva",
            "vi": "Mát-xcơ-va",
            "eu": "Mosku",
            "mt": "Moska",
            "nb": "Moskva",
            "pt": "Moscou",
            "tl": "Moscow",
            "ar": "موسكو",
            "he": "מוסקווה",
            "gv": "Moscow",
            "sw": "Moscow",
            "de": "Moskau",
            "gd": "Moscobha",
            "ja": "モスクワ",
            "yo": "Mọsko",
            "dv": "މޮސްކޯ",
            "cv": "Мускав",
            "bi": "Moskow",
            "fa": "مسکو",
            "gn": "Mosku",
            "no": "Moskva",
            "iu": "ᒨᔅᑯ",
            "na": "Moscow",
            "bs": "Moskva",
            "kk": "Мәскеу",
            "ml": "മോസ്കോ",
            "zu": "IMoskwa",
            "za": "Moscow",
            "ca": "Moscou",
            "hi": "मास्को",
            "ln": "Moskú",
            "la": "Moscua",
            "mi": "Mohikau",
            "av": "Москва",
            "gl": "Moscova - Москва",
            "es": "Moscú",
            "os": "Мæскуы",
            "af": "Moskou",
            "se": "Moskva",
            "ht": "Moskou",
            "nl": "Moskou",
            "kn": "ಮಾಸ್ಕೋ",
            "yi": "מאסקווע",
            "ty": "Moscou",
            "br": "Moskov",
            "el": "Μόσχα",
            "ce": "Москох",
            "tt": "Мәскәү",
            "tr": "Moskova",
            "ku": "Moskow",
            "te": "మాస్కో",
            "ie": "Moskwa",
            "sq": "Moska",
            "et": "Moskva",
            "ss": "Moscow",
            "hy": "Մոսկվա",
            "tg": "Маскав",
            "kl": "Moskva",
            "kw": "Moskva",
            "mr": "मॉस्को",
            "ka": "მოსკოვი",
            "ky": "Москва",
            "fr": "Moscou",
            "my": "မော်စကိုမြို့",
            "sm": "Moscow",
            "fy": "Moskou",
            "mk": "Москва",
            "ms": "Moscow",
            "th": "มอสโก",
            "ug": "Moskwa",
            "ur": "ماسکو",
            "bn": "মস্কো"
        },
        "lat": 55.7504461,
        "lon": 37.6174943,
        "country": "RU",
        "state": "Moscow"
    }
]

但作为回应，我得到了这样的例外

Exception in thread "main" org.springframework.web.client.RestClientException: Error while extracting response for type [class com.romanperkov.spring.rest.entity.cord] and content type [application/json;charset=utf-8]; nested exception is org.springframework.http.converter.HttpMessageNotReadableException: JSON parse error: Cannot deserialize instance of `com.romanperkov.spring.rest.entity.cord` out of START_ARRAY token; nested exception is com.fasterxml.jackson.databind.exc.MismatchedInputException: Cannot deserialize instance of `com.romanperkov.spring.rest.entity.cord` out of START_ARRAY token
 at [Source: (PushbackInputStream); line: 1, column: 1]
    at org.springframework.web.client.HttpMessageConverterExtractor.extractData(HttpMessageConverterExtractor.java:120)
    at org.springframework.web.client.RestTemplate.doExecute(RestTemplate.java:741)
    at org.springframework.web.client.RestTemplate.execute(RestTemplate.java:674)
    at org.springframework.web.client.RestTemplate.getForObject(RestTemplate.java:315)
    at com.romanperkov.spring.rest.Communication.test(Communication.java:81)
    at com.romanperkov.spring.rest.App.main(App.java:35)
Caused by: org.springframework.http.converter.HttpMessageNotReadableException: JSON parse error: Cannot deserialize instance of `com.romanperkov.spring.rest.entity.cord` out of START_ARRAY token; nested exception is com.fasterxml.jackson.databind.exc.MismatchedInputException: Cannot deserialize instance of `com.romanperkov.spring.rest.entity.cord` out of START_ARRAY token
 at [Source: (PushbackInputStream); line: 1, column: 1]
    at org.springframework.http.converter.json.AbstractJackson2HttpMessageConverter.readJavaType(AbstractJackson2HttpMessageConverter.java:284)
    at org.springframework.http.converter.json.AbstractJackson2HttpMessageConverter.read(AbstractJackson2HttpMessageConverter.java:242)
    at org.springframework.web.client.HttpMessageConverterExtractor.extractData(HttpMessageConverterExtractor.java:105)
    ... 5 more
Caused by: com.fasterxml.jackson.databind.exc.MismatchedInputException: Cannot deserialize instance of `com.romanperkov.spring.rest.entity.cord` out of START_ARRAY token
 at [Source: (PushbackInputStream); line: 1, column: 1]
    at com.fasterxml.jackson.databind.exc.MismatchedInputException.from(MismatchedInputException.java:59)
    at com.fasterxml.jackson.databind.DeserializationContext.reportInputMismatch(DeserializationContext.java:1468)
    at com.fasterxml.jackson.databind.DeserializationContext.handleUnexpectedToken(DeserializationContext.java:1242)
    at com.fasterxml.jackson.databind.DeserializationContext.handleUnexpectedToken(DeserializationContext.java:1190)
    at com.fasterxml.jackson.databind.deser.BeanDeserializer._deserializeFromArray(BeanDeserializer.java:604)
    at com.fasterxml.jackson.databind.deser.BeanDeserializer._deserializeOther(BeanDeserializer.java:190)
    at com.fasterxml.jackson.databind.deser.BeanDeserializer.deserialize(BeanDeserializer.java:166)
    at com.fasterxml.jackson.databind.ObjectMapper._readMapAndClose(ObjectMapper.java:4526)
    at com.fasterxml.jackson.databind.ObjectMapper.readValue(ObjectMapper.java:3521)
    at org.springframework.http.converter.json.AbstractJackson2HttpMessageConverter.readJavaType(AbstractJackson2HttpMessageConverter.java:273)
    ... 7 more

Process finished with exit code 1

我了解问题是apishka的响应以方括号开头，即它返回一个数组，但它没有名称，这种情况下如何进行？

描述要从响应 API 获取的实体的类

@Getter
@Setter
@NoArgsConstructor
public class cord {

    private List<String> name;
}

问题的解决方法是将类指定为数组

String url="http://api.openweathermap.org/geo/1.0/direct?q=QWERTY&limit=5&appid=fe7e6bcec3fedc63d4a158abd1c3c3eb";
        cord[] responseEntity=restTemplate.getForObject
                (url.replace("QWERTY","москва"), cord[].class);
        System.out.println(responseEntity[0]);
java json
Martin Hope
Roman
Asked: 2022-08-06 23:42:20 +0800 CST
  • 0

使用 Spring Boot 编写了一个电报机器人

一切都在 Intellij IDEA 中运行，但是当我尝试运行 JAR 文件时，它一直在抛出

Exception in thread "main" 
org.springframework.beans.factory.BeanCreationException: 
Error creating bean with name .

这已经是我最终解决的第三个问题了。我整个头都碎了，一定有办法不用手鼓跳舞就能跑 JAR，

请帮忙。

例子

.   ____          _            __ _ _
 /\\ / ___'_ __ _ _(_)_ __  __ _ \ \ \ \
( ( )\___ | '_ | '_| | '_ \/ _` | \ \ \ \
 \\/  ___)| |_)| | | | | || (_| |  ) ) ) )
  '  |____| .__|_| |_|_| |_\__, | / / / /
 =========|_|==============|___/=/_/_/_/
 :: Spring Boot ::                (v2.7.2)

Exception in thread "main" org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'resourceHandlerMapping' defined in class path resource [org/springframework/boot/autoconfigure/web/servlet/WebMvcAutoConfiguration$EnableWebMvcConfiguration.class]: Bean instantiation via factory method failed; nested exception is org.springframework.beans.BeanInstantiationException: Failed to instantiate [org.springframework.web.servlet.HandlerMapping]: Factory method 'resourceHandlerMapping' threw exception; nested exception is java.lang.IllegalStateException: No ServletContext set
        at org.springframework.beans.factory.support.ConstructorResolver.instantiate(ConstructorResolver.java:658)
        at org.springframework.beans.factory.support.ConstructorResolver.instantiateUsingFactoryMethod(ConstructorResolver.java:638)
        at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.instantiateUsingFactoryMethod(AbstractAutowireCapableBeanFactory.java:1352)
        at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBeanInstance(AbstractAutowireCapableBeanFactory.java:1195)
        at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:582)
        at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:542)
        at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:335)
        at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:234)
        at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:333)
        at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:208)
        at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:955)
        at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:918)
        at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:583)
        at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:734)
        at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:408)
        at org.springframework.boot.SpringApplication.run(SpringApplication.java:308)
        at org.springframework.boot.SpringApplication.run(SpringApplication.java:1306)
        at org.springframework.boot.SpringApplication.run(SpringApplication.java:1295)
        at com.example.demo.UltraGangstaMegaBotApplication.main(UltraGangstaMegaBotApplication.java:21)
Caused by: org.springframework.beans.BeanInstantiationException: Failed to instantiate [org.springframework.web.servlet.HandlerMapping]: Factory method 'resourceHandlerMapping' threw exception; nested exception is java.lang.IllegalStateException: No ServletContext set
        at org.springframework.beans.factory.support.SimpleInstantiationStrategy.instantiate(SimpleInstantiationStrategy.java:185)
        at org.springframework.beans.factory.support.ConstructorResolver.instantiate(ConstructorResolver.java:653)
        ... 18 more
Caused by: java.lang.IllegalStateException: No ServletContext set
        at org.springframework.util.Assert.state(Assert.java:76)
        at org.springframework.web.servlet.config.annotation.WebMvcConfigurationSupport.resourceHandlerMapping(WebMvcConfigurationSupport.java:591)
        at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
        at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.base/java.lang.reflect.Method.invoke(Method.java:566)
        at org.springframework.beans.factory.support.SimpleInstantiationStrategy.instantiate(SimpleInstantiationStrategy.java:154)
        ... 19 more

I:\Users\El_Chupa\Desktop\JAVA\JAVA Projects\gradleproject2\UltraGangstaMegaBot\out\artifacts\UltraGangstaMegaBot_jar>

pom.xml

<?xml version="1.0" encoding="UTF-8"?>
<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 https://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.7.2</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <groupId>com.example</groupId>
    <artifactId>demo</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>UltraGangstaMegaBot</name>
    <description>Demo project for Spring Boot</description>
    <properties>
        <java.version>11</java.version>
    </properties>
    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-data-jpa</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>

        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <scope>runtime</scope>
        </dependency>
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <optional>true</optional>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>

        <!--Библиотека для парсинга эмоджи-->
        <dependency>
            <groupId>com.vdurmont</groupId>
            <artifactId>emoji-java</artifactId>
            <version>5.1.1</version>
        </dependency>

        
        <dependency>
            <groupId>org.telegram</groupId>
            <artifactId>telegrambots</artifactId>
            <version>6.1.0</version>
        </dependency>
        <dependency>
            <groupId>org.slf4j</groupId>
            <artifactId>slf4j-nop</artifactId>
            <version>1.7.13</version>
        </dependency>

        <dependency>
            <groupId>log4j</groupId>
            <artifactId>log4j</artifactId>
            <version>1.2.17</version>
        </dependency>



    </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
                <configuration>
                    <excludes>
                        <exclude>
                            <groupId>org.projectlombok</groupId>
                            <artifactId>lombok</artifactId>
                        </exclude>
                    </excludes>
                </configuration>
            </plugin>
        </plugins>
    </build>

</project>
java spring
Martin Hope
Roman
Asked: 2022-07-23 20:52:43 +0800 CST
  • 0

我正在编写代码，其中不同的方法适用于一个静态集合。我开始写，然后 NullPointerException 开始向我飞来，起初我以为我在某个地方搞砸了，然后我在一个干净的项目中为每个人检查它。创建了一个类，该类有一个 List list 类型的字段；，然后在我写的主要方法中 list.add("111"); 我得到 NullPointerException。为什么？该字段对于整个类都是静态的。运动忘记了Java，请帮忙。我使用 jdks\az​​ul-11.0.14.1\bin\java.exe

问题：如何将元素添加到静态集合？

import java.util.ArrayList;
import java.util.List;

public class MiniDuckSimulator {

    static List<String> point;


    public static void main(String[] args) {





        point.add("111");
        System.out.println(point);



    }
}
java