springboot整合httpClient

创建httpClientConfig配置类

@Configuration
@PropertySource(value="classpath:/properties/httpClient.properties")
public class HttpClientConfig {
    @Value("${http.maxTotal}")
    private Integer maxTotal;                        //最大连接数

    @Value("${http.defaultMaxPerRoute}")
    private Integer defaultMaxPerRoute;                //最大并发链接数

    @Value("${http.connectTimeout}")
    private Integer connectTimeout;                    //创建链接的最大时间

    @Value("${http.connectionRequestTimeout}") 
    private Integer connectionRequestTimeout;        //链接获取超时时间

    @Value("${http.socketTimeout}")
    private Integer socketTimeout;                      //数据传输最长时间

    @Value("${http.staleConnectionCheckEnabled}")
    private boolean staleConnectionCheckEnabled;     //提交时检查链接是否可用

    //定义httpClient链接池
    @Bean(name="httpClientConnectionManager")
    public PoolingHttpClientConnectionManager getPoolingHttpClientConnectionManager() {
        PoolingHttpClientConnectionManager manager = new PoolingHttpClientConnectionManager();
        manager.setMaxTotal(maxTotal);  //设定最大链接数
        manager.setDefaultMaxPerRoute(defaultMaxPerRoute);  //设定并发链接数
        return manager;
    }

    //定义HttpClient
    /**
     * 实例化连接池，设置连接池管理器。
     * 这里需要以参数形式注入上面实例化的连接池管理器
      @Qualifier 指定bean标签进行注入
     */
    @Bean(name = "httpClientBuilder")
    public HttpClientBuilder getHttpClientBuilder(@Qualifier("httpClientConnectionManager")PoolingHttpClientConnectionManager httpClientConnectionManager){

        //HttpClientBuilder中的构造方法被protected修饰，所以这里不能直接使用new来实例化一个HttpClientBuilder,可以使用HttpClientBuilder提供的静态方法create()来获取HttpClientBuilder对象
        HttpClientBuilder httpClientBuilder = HttpClientBuilder.create();
        httpClientBuilder.setConnectionManager(httpClientConnectionManager);
        return httpClientBuilder;
    }

    /**
     *     注入连接池，用于获取httpClient
     * @param httpClientBuilder
     * @return
     */
    @Bean
    public CloseableHttpClient getCloseableHttpClient(@Qualifier("httpClientBuilder") HttpClientBuilder httpClientBuilder){

        return httpClientBuilder.build();
    }

    /**
     * Builder是RequestConfig的一个内部类
      * 通过RequestConfig的custom方法来获取到一个Builder对象
      * 设置builder的连接信息
     * @return
     */
    @Bean(name = "builder")
    public RequestConfig.Builder getBuilder(){
        RequestConfig.Builder builder = RequestConfig.custom();
        return builder.setConnectTimeout(connectTimeout)
                .setConnectionRequestTimeout(connectionRequestTimeout)
                .setSocketTimeout(socketTimeout)
                .setStaleConnectionCheckEnabled(staleConnectionCheckEnabled);
    }

    /**
     * 使用builder构建一个RequestConfig对象
     * @param builder
     * @return
     */
    @Bean
    public RequestConfig getRequestConfig(@Qualifier("builder") RequestConfig.Builder builder){
        return builder.build();
    }
}

创建HttpClientClose关闭配置类

@Component    //交给spring容器管理
public class HttpClientClose extends Thread{
    @Autowired
    private PoolingHttpClientConnectionManager manage;
    private volatile boolean shutdown;    //开关 volatitle表示多线程可变数据,一个线程修改,其他线程立即修改
    
    public HttpClientClose() {
        ///System.out.println("执行构造方法,实例化对象");
        //线程开启启动
        this.start();
    }
    
    
    @Override
    public void run() {
        try {
            //如果服务没有关闭,执行线程
            while(!shutdown) {
                synchronized (this) {
                    wait(5000);            //等待5秒
                    //System.out.println("线程开始执行,关闭超时链接");
                    //关闭超时的链接
                    PoolStats stats = manage.getTotalStats();
                    int av = stats.getAvailable();    //获取可用的线程数量
                    int pend = stats.getPending();    //获取阻塞的线程数量
                    int lea = stats.getLeased();    //获取当前正在使用的链接数量
                    int max = stats.getMax();
                    //System.out.println("max/"+max+":    av/"+av+":  pend/"+pend+":   lea/"+lea);
                    manage.closeExpiredConnections();
                }
            }
        } catch (Exception e) {
            e.printStackTrace();
            throw new RuntimeException();
        }

        super.run();
    }

    //关闭清理无效连接的线程
    @PreDestroy    //容器关闭时执行该方法.
    public void shutdown() {
        shutdown = true;
        synchronized (this) {
            //System.out.println("关闭全部链接!!");
            notifyAll(); //全部从等待中唤醒.执行关闭操作;
        }
    }

编写工具类HttpClientService

@Service
public class HttpClientService {

    @Autowired
    private CloseableHttpClient httpClient;
    @Autowired
    private RequestConfig requestConfig;

    /**
     * 通过给的url地址，获取服务器数据
     * @param url 服务器地址
     * @param params 封装用户参数
     * @param charset 设定字符编码
     * @return
     */
    public String doGet(String url, Map<String,String> params,String charset) {
        if (StringUtils.isEmpty(charset)) {
            charset = "utf-8";
        }
        //判断是否有参数
        if (params != null) {
            url +="?";
            for (Map.Entry<String,String> entry: params.entrySet()) {
                String key = entry.getKey();
                String value = entry.getValue();
                url += key +"="+value+"&";
            }
            url = url.substring(0,url.length() - 1);
        }
        HttpGet httpGet = new HttpGet(url);
        httpGet.setConfig(requestConfig);
        String result = "";
        try {
            CloseableHttpResponse response = httpClient.execute(httpGet);
            if (response.getStatusLine().getStatusCode() == 200) {
                result = EntityUtils.toString(response.getEntity(),charset);
            }
        } catch (IOException e) {
            e.printStackTrace();
            throw new RuntimeException(e);
        }
        return result;
    }

    public String doGet(String url, Map<String,String> params) {
            return doGet(url,params,null);
    }
    public String doGet(String url) {
        return doGet(url,null,null);
    }

    public <T> T doGet(String url,Class<T> tClass,Map<String,String> map, String charSet){
        String result = doGet(url,map,charSet);
        return ObjectMapperUtil.toObject(result, tClass);
    }

}

测试类：

@SpringBootTest
@RunWith(SpringRunner.class)
public class HttpClientTest {

@Autowired
private HttpClientService httpClientService;
 
@Test 
public void getTest1() {
　　　　//次url是通过nginx加hosts文件映射的，需要修改url才可以使用
        String url = "http://manage.jt.com/web/item/findItemDescById";
        Map<String,String> map = new HashMap<>();
        map.put("itemId","562379");
        String s = httpClientService.doGet(url, map);
        System.out.println(s);

    }