RestTemplate推送数据无响应的解决办法

导读

• A平台在给其他平台推送数据时，A平台调用其他平台接口成功，但无返回结果，导致消费机数据不消费。

逻辑分析

• 应该有推送多长时间无返回结果就为推送失败，这样的逻辑。

代码分析

推送源码

RestTemplate restTemplate = new RestTemplate();
ResponseResult responseResult = restTemplate.postForObject(syncUrl, formEntity, ResponseResult.class);

• 感觉restTemplate有配置，但是查看了RestTemplate类，并没有相关配置。经过百度发现：SimpleClientHttpRequestFactory类。

SimpleClientHttpRequestFactory 部分源码

public class SimpleClientHttpRequestFactory implements ClientHttpRequestFactory, AsyncClientHttpRequestFactory {
    
    
    private static final int DEFAULT_CHUNK_SIZE = 4096;
    private Proxy proxy;
    private boolean bufferRequestBody = true;
    private int chunkSize = 4096;
    private int connectTimeout = -1;
    private int readTimeout = -1;
    private boolean outputStreaming = true;
    private AsyncListenableTaskExecutor taskExecutor;
    //...
    public void setConnectTimeout(int connectTimeout) {
        this.connectTimeout = connectTimeout;
    }
    //...
    public void setReadTimeout(int readTimeout) {
        this.readTimeout = readTimeout;
    }
}

• 发现有 setConnectTimeout 和 setReadTimeout 方法，且默认值为 -1。进而猜测是这里导致一直卡死。

修改推送代码（方式一）

SimpleClientHttpRequestFactory requestFactory = new SimpleClientHttpRequestFactory();
        requestFactory.setConnectTimeout(20000);
        requestFactory.setReadTimeout(20000);
        RestTemplate restTemplate = new RestTemplate(requestFactory);

思考

• 有没有配置文件可以进行配置，而不用每次set配置呢？

编写配置 RestTemplateConfiguration 类 （方式二）

@Configuration
@ConditionalOnClass(value = {RestTemplate.class, HttpClient.class})
public class RestTemplateConfiguration {
    
    
    @Value("${remote.maxTotalConnect:0}")
    private int maxTotalConnect; //连接池的最大连接数默认为0
    @Value("${remote.maxConnectPerRoute:200}")
    private int maxConnectPerRoute; //单个主机的最大连接数
    @Value("${remote.connectTimeout:2000}")
    private int connectTimeout; //连接超时默认2s
    @Value("${remote.readTimeout:30000}")
    private int readTimeout; //读取超时默认30s

    private ClientHttpRequestFactory createFactory() {
        if (this.maxTotalConnect <= 0) {
            SimpleClientHttpRequestFactory factory = new SimpleClientHttpRequestFactory();
            factory.setConnectTimeout(this.connectTimeout);
            factory.setReadTimeout(this.readTimeout);
            return factory;
        }
        HttpClient httpClient = HttpClientBuilder.create().setMaxConnTotal(this.maxTotalConnect)
                .setMaxConnPerRoute(this.maxConnectPerRoute).build();
        HttpComponentsClientHttpRequestFactory factory = new HttpComponentsClientHttpRequestFactory(
                httpClient);
        factory.setConnectTimeout(this.connectTimeout);
        factory.setReadTimeout(this.readTimeout);
        return factory;
    }

    @Bean
    @ConditionalOnMissingBean(RestTemplate.class)
    public RestTemplate getRestTemplate() {
        RestTemplate restTemplate = new RestTemplate(this.createFactory());
        List<HttpMessageConverter<?>> converterList = restTemplate.getMessageConverters();

        HttpMessageConverter<?> converterTarget = null;
        for (HttpMessageConverter<?> item : converterList) {
            if (StringHttpMessageConverter.class == item.getClass()) {
                converterTarget = item;
                break;
            }
        }
        if (null != converterTarget) {
            converterList.remove(converterTarget);
        }
        converterList.add(1, new StringHttpMessageConverter(StandardCharsets.UTF_8));

        converterList.add(new FastJsonHttpMessageConverter4());
        return restTemplate;
    }

}

该配置文件的使用

@Service
@Import({RestTemplateConfiguration.class})
public class AServiceImpl implements AService {
    
    
    private final ADao aDao;
    //...
}

• 本人原创，请勿抄袭，如果喜欢请转载，谢谢。