Java 在DesktopApplication上使用RestTemplate（非基于Web）_Java_Spring_Spring Boot_Spring Mvc_Resttemplate

Java 在DesktopApplication上使用RestTemplate（非基于Web）

java spring spring-boot spring-mvc

Java 在DesktopApplication上使用RestTemplate（非基于Web）,java,spring,spring-boot,spring-mvc,resttemplate,Java,Spring,Spring Boot,Spring Mvc,Resttemplate,我正在使用OpenJfx和SpringBoot开发一个桌面应用程序。到目前为止，它运作良好但是，这个应用程序将使用一个Web服务，我想使用RestTemplate。当我将springweb依赖项添加到pom.xml文件时，springboot会尝试实例化一些我没有用过的东西依赖项添加了： <dependency> <groupId>org.springframework</groupId> <artifactId>spring-

我正在使用

OpenJfx

和

SpringBoot

开发一个桌面应用程序。到目前为止，它运作良好

但是，这个应用程序将使用一个Web服务，我想使用RestTemplate。当我将

springweb

依赖项添加到pom.xml文件时，springboot会尝试实例化一些我没有用过的东西

依赖项添加了：

<dependency>
    <groupId>org.springframework</groupId>
    <artifactId>spring-web</artifactId>
    <version>5.0.7.RELEASE</version>
</dependency>

根据回复，我添加了以下属性：

spring.main.web-application-type=none

再次运行应用程序时，会有更多内容尝试实例化：

[2020-08-11 10:29:47] - WARN  - Exception encountered during context initialization - cancelling refresh attempt: org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'jacksonObjectMapper' defined in class path resource [org/springframework/boot/autoconfigure/jackson/JacksonAutoConfiguration$JacksonObjectMapperConfiguration.class]: Unsatisfied dependency expressed through method 'jacksonObjectMapper' parameter 0; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'jacksonObjectMapperBuilder' defined in class path resource [org/springframework/boot/autoconfigure/jackson/JacksonAutoConfiguration$JacksonObjectMapperBuilderConfiguration.class]: Bean instantiation via factory method failed; nested exception is org.springframework.beans.BeanInstantiationException: Failed to instantiate [org.springframework.http.converter.json.Jackson2ObjectMapperBuilder]: Factory method 'jacksonObjectMapperBuilder' threw exception; nested exception is java.lang.NoSuchMethodError: org.springframework.http.converter.json.Jackson2ObjectMapperBuilder.visibility(Lcom/fasterxml/jackson/annotation/PropertyAccessor;Lcom/fasterxml/jackson/annotation/JsonAutoDetect$Visibility;)Lorg/springframework/http/converter/json/Jackson2ObjectMapperBuilder; [AbstractApplicationContext.java:558] 
[2020-08-11 10:29:47] - INFO  - 

Error starting ApplicationContext. To display the conditions report re-run your application with 'debug' enabled. [ConditionEvaluationReportLoggingListener.java:136] 
[2020-08-11 10:29:47] - ERROR - 

***************************
APPLICATION FAILED TO START
***************************

Description:

An attempt was made to call a method that does not exist. The attempt was made from the following location:

    org.springframework.boot.autoconfigure.jackson.JacksonAutoConfiguration$Jackson2ObjectMapperBuilderCustomizerConfiguration$StandardJackson2ObjectMapperBuilderCustomizer.configureVisibility(JacksonAutoConfiguration.java:258)

The following method did not exist:

    org.springframework.http.converter.json.Jackson2ObjectMapperBuilder.visibility(Lcom/fasterxml/jackson/annotation/PropertyAccessor;Lcom/fasterxml/jackson/annotation/JsonAutoDetect$Visibility;)Lorg/springframework/http/converter/json/Jackson2ObjectMapperBuilder;

The method's class, org.springframework.http.converter.json.Jackson2ObjectMapperBuilder, is available from the following locations:

    jar:file:/C:/Users/xxx/.m2/repository/org/springframework/spring-web/5.0.7.RELEASE/spring-web-5.0.7.RELEASE.jar!/org/springframework/http/converter/json/Jackson2ObjectMapperBuilder.class

It was loaded from the following location:

    file:/C:/Users/xxx/.m2/repository/org/springframework/spring-web/5.0.7.RELEASE/spring-web-5.0.7.RELEASE.jar


Action:

Correct the classpath of your application so that it contains a single, compatible version of org.springframework.http.converter.json.Jackson2ObjectMapperBuilder
 [LoggingFailureAnalysisReporter.java:40]

问题是，我只想使用RestTemplate来使用Rest服务。有没有一种方法可以将类添加到其他spring库中，而无需承担所有额外的负担？

RestTemplate

只是

HttpClient

实现的包装。该http客户机需要由某人提供，例如tomcat、undertow、netty、jetty等底层服务器实现，但也可以来自独立客户机

因此，如果我们仔细检查您的错误：

[2020-08-11 10:26:20] - WARN  - Exception encountered during context initialization - cancelling refresh attempt: org.springframework.context.ApplicationContextException: Unable to start web server; nested exception is org.springframework.context.ApplicationContextException: Unable to start ServletWebServerApplicationContext due to missing ServletWebServerFactory bean. [AbstractApplicationContext.java:558]

这意味着它无法启动服务器，因为您已经拉入了

springweb

，这是许多需要服务器的类。它尝试

autostart

许多类

spring.main.web-application-type=none

因此，使用此参数，基本上可以禁用所有将在web应用程序中运行的

autostart

类。这不会禁用spring上下文的创建（创建所有spring类都需要该上下文，以确保自动连接工作、bean等）

[2020-08-11 10:29:47]-警告-上下文初始化过程中遇到异常-取消刷新尝试：org.springframework.beans.factory.unsatifiedpendencyException:创建名为“jacksonObjectMapper”的bean时出错，该bean在类路径资源中定义[org/springframework/boot/autoconfigure/jackson/JacksonAutoConfiguration$JacksonObjectMapperConfiguration.class]：通过方法“jacksonObjectMapper”参数0表示的未满足的依赖关系；嵌套异常为org.springframework.beans.factory.BeanCreationException:创建类路径资源中定义的名为“jacksonObjectMapperBuilder”的bean时出错[org/springframework/boot/autoconfigure/jackson/JacksonAutoConfiguration$JacksonObjectMapperBuilderConfiguration.class]：通过工厂方法实例化Bean失败；嵌套异常为org.springframework.beans.beanstantiationexception:实例化[org.springframework.http.converter.json.Jackson2ObjectMapperBuilder]失败：工厂方法“jacksonObjectMapperBuilder”引发异常；嵌套异常为java.lang.NoSuchMethodError:org.springframework.http.converter.json.Jackson2ObjectMapperBuilder.visibility（Lcom/fasterxml/jackson/annotation/PropertyAccessor；Lcom/fasterxml/jackson/annotation/JsonAutoDetect$visibility；）Lorg/springframework/http/converter/json/Jackson2ObjectMapperBuilder；[AbstractApplicationContext.java:558]

因此，当您现在运行它时，它尝试创建上下文，但失败了，因为它找不到

Jackson

，因为Jackson是需要的，并且是使用您以前的参数禁用的

autostart

类创建的

它基本上是说你想用一辆车，但你不想要发动机、车轮、内饰、车门、方向盘等。如果你没有一个服务器或任何相关的东西来提供HttpClient，那么

RestTemplate

就没有什么可使用或包装的

如果您正在寻找一个独立的简单rest客户端，我建议您研究一下

RestTemplate

只是一个围绕着一个

HttpClient

实现的包装器。该http客户端需要有人提供，例如底层服务器实现，如tomcat、undertow、netty、jetty等，但也可以来自独立客户端