Java Spring引导在创建自定义RestTemplate时出错

我有一个

sendGetREST

方法来发送一些

URL端点

，并获得响应：

@Component
public class HttpURLCommand {
    private static Logger logger = Logger.getLogger(HttpURLCommand.class);

public String sendGetREST(String soapUrl, Object[] parameters) throws IOException{
        final String SOAP_URL = MessageFormat.format(soapUrl, parameters);
        RestTemplate restTemplate = new RestTemplate();
        ResponseEntity<String> response = restTemplate.getForEntity(SOAP_URL, String.class);

    logger.info("status code is: "+response.getStatusCode());
    if(response.getStatusCode().equals(HttpStatus.OK)){
        logger.info("send success");
        return response.getBody();
    }
    else {
        logger.info("send failed");
        return null;
    }

  }
}

因此类将像这样调用restTemplate:

@Component
 public class HttpURLCommand {
    private static Logger logger = Logger.getLogger(HttpURLCommand.class);
    @Autowired
    RestTemplate restTemplate;

public String sendGetREST(String soapUrl, Object[] parameters) throws IOException{
        final String SOAP_URL = MessageFormat.format(soapUrl, parameters);
        ResponseEntity<String> response = restTemplate.getForEntity(SOAP_URL, String.class);

    logger.info("status code is: "+response.getStatusCode());
    if(response.getStatusCode().equals(HttpStatus.OK)){
        logger.info("send success");
        return response.getBody();
    }
    else {
        logger.info("send failed");
        return null;
    }

  }
}

仅供参考，错误远不止上述显示

第一行类似于：

org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'restTemplate' defined in class path resource .....

错误表明类路径有问题，可能是因为类路径中没有类或.apache.http.protocol.HttpContext。Spring RestTemplate经常使用这个类。通常我们可以在ApacheHttpClient库中找到这个类。您应该再次检查依赖项。如果找不到它，可以考虑添加以下依赖关系（如果使用Maven）

org.apache.httpcomponents
httpclient
4.5.2

成功了！我不明白为什么它一开始运行得很好（没有自定义超时）？嗯。有人能给我解释一下吗？默认情况下，RestTemplate依赖于标准JDK设施来建立HTTP连接。因此，第一个地方运作良好。但是，在第二个示例中，您确实“告诉”RestTemplate使用ApacheHttpComponent与web服务通信。因此，它抛出异常，因为找不到某些类。下面是您在第二节中的声明：@Bean public RestTemplate RestTemplate（）{返回新的RestTemplate（clientHttpRequestFactory（））；}。在第一个示例中，您使用默认的httpclHere是来自Spring网站的参考，它还提到了默认的http客户机。经过一个小时的寻找解决方案，这是唯一有效的方法。谢谢

Caused by: java.lang.NoClassDefFoundError: org/apache/http/protocol/HttpContext
at com.xl.MbbI.config.HTTPConfiguration.clientHttpRequestFactory(HTTPConfiguration.java:25) ~[classes/:na]
at com.xl.MbbI.config.HTTPConfiguration.restTemplate(HTTPConfiguration.java:21) ~[classes/:na]
at com.xl.MbbI.config.HTTPConfiguration$$EnhancerBySpringCGLIB$$191f99f.CGLIB$restTemplate$0(<generated>) ~[na:na]
at com.xl.MbbI.config.HTTPConfiguration$$EnhancerBySpringCGLIB$$191f99f$$FastClassBySpringCGLIB$$8330ce57.invoke(<generated>) ~[na:na]
at org.springframework.cglib.proxy.MethodProxy.invokeSuper(MethodProxy.java:228) ~[spring-core-4.3.0.RC2.jar:4.3.0.RC2]
at org.springframework.context.annotation.ConfigurationClassEnhancer$BeanMethodInterceptor.intercept(ConfigurationClassEnhancer.java:356) ~[spring-context-4.3.0.RC2.jar:4.3.0.RC2]
at com.xl.MbbI.config.HTTPConfiguration$$EnhancerBySpringCGLIB$$191f99f.restTemplate(<generated>) ~[na:na]
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:1.7.0_60]
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) ~[na:1.7.0_60]
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) ~[na:1.7.0_60]
at java.lang.reflect.Method.invoke(Unknown Source) ~[na:1.7.0_60]
at org.springframework.beans.factory.support.SimpleInstantiationStrategy.instantiate(SimpleInstantiationStrategy.java:162) ~[spring-beans-4.3.0.RC2.jar:4.3.0.RC2]
... 24 common frames omitted
Caused by: java.lang.ClassNotFoundException: org.apache.http.protocol.HttpContext
at java.net.URLClassLoader$1.run(Unknown Source) ~[na:1.7.0_60]
at java.net.URLClassLoader$1.run(Unknown Source) ~[na:1.7.0_60]
at java.security.AccessController.doPrivileged(Native Method) ~[na:1.7.0_60]
at java.net.URLClassLoader.findClass(Unknown Source) ~[na:1.7.0_60]
at java.lang.ClassLoader.loadClass(Unknown Source) ~[na:1.7.0_60]
at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source) ~[na:1.7.0_60]
at java.lang.ClassLoader.loadClass(Unknown Source) ~[na:1.7.0_60]
... 36 common frames omitted

org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'restTemplate' defined in class path resource .....

Caused by: java.lang.NoClassDefFoundError: org/apache/http/protocol/HttpContext

 <dependency>
    <groupId>org.apache.httpcomponents</groupId>
    <artifactId>httpclient</artifactId>
    <version>4.5.2</version>
</dependency>