java：HTTP连接池，设置代理

package com.picc.web.utils;

import org.apache.http.HttpHost;
import org.apache.http.client.HttpClient;
import org.apache.http.client.config.RequestConfig;
import org.apache.http.conn.HttpClientConnectionManager;
import org.apache.http.impl.client.HttpClientBuilder;
import org.apache.http.impl.conn.PoolingHttpClientConnectionManager;
import org.springframework.boot.context.properties.ConfigurationProperties;
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.converter.HttpMessageConverter;
import org.springframework.http.converter.StringHttpMessageConverter;
import org.springframework.web.client.RestTemplate;

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

/**
 * HttpClient的配置类---类似工具类
 * Configuration:标明这是一个配置类
 * ConfigurationProperties：加载application.properties属性文件
 *          prefix：前缀
 *          ignoreUnknownFields：忽略找不到的属性
 * 自动将属性文件中的值赋值该类中的属性
 *
 * 最终需要知道：
 * 1 SpringBoot推荐使用RestTemplate操作RestFul API
 * 2 RestTemplate底层需要借助HttpClient创建
 *
 *
 */
@Configuration
//@ConfigurationProperties(prefix = "http", ignoreUnknownFields = true)
public class HttpClientConfig {

    private Integer maxTotal=300;// 最大连接

    private Integer defaultMaxPerRoute=320;// 每个host的最大连接

    private Integer connectTimeout=5000;// 连接超时时间

    private Integer connectionRequestTimeout=5000;// 请求超时时间

    private Integer socketTimeout=5000;// 响应超时时间
    //代理IP
    static String host = "127.0.0.1";
    //代理端口
    static int port = 8088;
    /**
     * HttpClient连接池
     * @return
     */
    @Bean
    public HttpClientConnectionManager httpClientConnectionManager() {
        PoolingHttpClientConnectionManager connectionManager = new PoolingHttpClientConnectionManager();
        connectionManager.setMaxTotal(maxTotal);
        connectionManager.setDefaultMaxPerRoute(defaultMaxPerRoute);
        return connectionManager;
    }

    /**
     * 注册RequestConfig
     * @return
     */
    @Bean
    public RequestConfig requestConfig() {
        return RequestConfig.custom().setConnectTimeout(connectTimeout)
                .setConnectionRequestTimeout(connectionRequestTimeout).setSocketTimeout(socketTimeout)
                .build();
    }

    /**
     * 注册HttpClient
     * @param manager
     * @param config
     * @return
     */
    @Bean
    public HttpClient httpClient(HttpClientConnectionManager manager, RequestConfig config) {
        HttpHost proxy = null;
        try {
            proxy = new HttpHost(host, port, "http");
        } catch (Exception e) {
            e.printStackTrace();
        }
        return HttpClientBuilder.create().setConnectionManager(manager).setDefaultRequestConfig(config).setProxy(proxy)
                .build();
    }
    /**
     * 使用连接池管理连接
     * @param httpClient
     * @return
     */
    @Bean
    public ClientHttpRequestFactory requestFactory(HttpClient httpClient) {
        return new HttpComponentsClientHttpRequestFactory(httpClient);
    }
    /**
     * 使用HttpClient来初始化一个RestTemplate
     * @param requestFactory
     * @return
     */
    @Bean
    public RestTemplate restTemplate(ClientHttpRequestFactory requestFactory) {
        RestTemplate template = new RestTemplate(requestFactory);

        List<HttpMessageConverter<?>> list = template.getMessageConverters();
        for (HttpMessageConverter<?> mc : list) {
            if (mc instanceof StringHttpMessageConverter) {
                ((StringHttpMessageConverter) mc).setDefaultCharset(Charset.forName("UTF-8"));
            }
        }
        return template;
    }

    public Integer getMaxTotal() {
        return maxTotal;
    }

    public void setMaxTotal(Integer maxTotal) {
        this.maxTotal = maxTotal;
    }

    public Integer getDefaultMaxPerRoute() {
        return defaultMaxPerRoute;
    }

    public void setDefaultMaxPerRoute(Integer defaultMaxPerRoute) {
        this.defaultMaxPerRoute = defaultMaxPerRoute;
    }

    public Integer getConnectTimeout() {
        return connectTimeout;
    }

    public void setConnectTimeout(Integer connectTimeout) {
        this.connectTimeout = connectTimeout;
    }

    public Integer getConnectionRequestTimeout() {
        return connectionRequestTimeout;
    }

    public void setConnectionRequestTimeout(Integer connectionRequestTimeout) {
        this.connectionRequestTimeout = connectionRequestTimeout;
    }

    public Integer getSocketTimeout() {
        return socketTimeout;
    }

    public void setSocketTimeout(Integer socketTimeout) {
        this.socketTimeout = socketTimeout;
    }
}

private RestTemplate bean = SpringContextUtil.getBean(RestTemplate.class);
    @Override
    public void run() {
        ResponseEntity<String> forEntity = bean.getForEntity("http://www.baidu.com", String.class);
        System.out.println(forEntity.toString());
    }

org.springframework.web.client.ResourceAccessException: I/O error on POST request for
Caused by: org.apache.http.conn.HttpHostConnectException: Connect to 127.0.0.1:8088 [/127.0.0.1] failed: Connection refused: connect

@Autowired
    private RestTemplate restTemplate;
    
    Map<String, String> map = new HashMap<>();
    //个性化参数
    map.put("yearMonth",ny);
    HttpHeaders headers = new HttpHeaders();
    headers.set("Authorization", appCode);
    HttpEntity<Map> requestEntity = new HttpEntity<>(map, headers);
    String post =restTemplate.postForEntity(holidayUrl,requestEntity,String.class).getBody();