使用springboot 中的 restTemplate

项目中想直接使用 restTemplate 发送请求。

import com.alibaba.fastjson.support.spring.FastJsonHttpMessageConverter4;
import org.apache.http.client.HttpClient;
import org.apache.http.impl.client.HttpClientBuilder;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.boot.autoconfigure.condition.ConditionalOnMissingBean;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.http.client.ClientHttpRequestFactory;
import org.springframework.http.client.HttpComponentsClientHttpRequestFactory;
import org.springframework.http.client.SimpleClientHttpRequestFactory;
import org.springframework.http.converter.HttpMessageConverter;
import org.springframework.http.converter.StringHttpMessageConverter;
import org.springframework.web.client.RestTemplate;

import java.nio.charset.StandardCharsets;
import java.util.List;

@Configuration
public class RestTemplateConfig {

    @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("${remote.connectTimeout:10000}")
    private int connectTimeout; //连接超时默认10s
    @Value("${remote.readTimeout:30000}")
    private int readTimeout; //读取超时默认30s

    //创建HTTP客户端工厂
    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;
    }

    //初始化RestTemplate,并加入spring的Bean工厂，由spring统一管理
    @Bean
    @ConditionalOnMissingBean(RestTemplate.class)
    public RestTemplate getRestTemplate() {
        RestTemplate restTemplate = new RestTemplate(this.createFactory());
        List<HttpMessageConverter<?>> converterList = restTemplate.getMessageConverters();

        //重新设置StringHttpMessageConverter字符集为UTF-8，解决中文乱码问题
        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));

        //加入FastJson转换器
        converterList.add(new FastJsonHttpMessageConverter4());
        return restTemplate;
    }


}

配置了 RestTemplateConfig  之后即可通过

    @Autowired
    private RestTemplate restTemplate;

即可使用