添加代码注释

src/main/java/com/lxg/springboot/HttpClient.java

@@ -33,17 +33,30 @@ public class HttpClient {
     @Value("${http.staleConnectionCheckEnabled}")
     private boolean staleConnectionCheckEnabled;
 
+    /**
+     * 首先实例化一个连接池管理器，设置最大连接数、并发连接数
+     * @return
+     */
     @Bean(name = "httpClientConnectionManager")
     public PoolingHttpClientConnectionManager getHttpClientConnectionManager(){
         PoolingHttpClientConnectionManager httpClientConnectionManager = new PoolingHttpClientConnectionManager();
+        //最大连接数
         httpClientConnectionManager.setMaxTotal(maxTotal);
+        //并发数
         httpClientConnectionManager.setDefaultMaxPerRoute(defaultMaxPerRoute);
         return httpClientConnectionManager;
     }
 
+    /**
+     * 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
+     * @param httpClientConnectionManager
+     * @return
+     */
     @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);
@@ -51,12 +64,23 @@ public class HttpClient {
         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
+     * 这里还可以设置proxy，cookieSpec等属性。有需要的话可以在此设置
+     * @return
+     */
     @Bean(name = "builder")
     public RequestConfig.Builder getBuilder(){
         RequestConfig.Builder builder = RequestConfig.custom();
@@ -66,6 +90,11 @@ public class HttpClient {
                 .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();

src/main/java/com/lxg/springboot/http/HttpAPIService.java

@@ -96,7 +96,7 @@ public class HttpAPIService {
             for (Map.Entry<String, Object> entry : map.entrySet()) {
                 list.add(new BasicNameValuePair(entry.getKey(), entry.getValue().toString()));
             }
-            // 构造佛from表单对象
+            // 构造from表单对象
             UrlEncodedFormEntity urlEncodedFormEntity = new UrlEncodedFormEntity(list, "UTF-8");
 
             // 把表单放到post里

src/main/java/com/lxg/springboot/http/IdleConnectionEvictor.java

@@ -1,7 +1,5 @@
 package com.lxg.springboot.http;
 
-import java.util.Date;
-
 import org.apache.http.conn.HttpClientConnectionManager;
 import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.stereotype.Component;