專案環境：

jdk1.8+spring4.3.12

在專案開發中，經常用呼叫http介面，下面是封裝apache的httpclient工具類。

二、樣例程式碼：

package org.egg.utils;
import org.apache.http.client.config.RequestConfig;
import org.apache.http.client.methods.CloseableHttpResponse;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.client.methods.HttpPost;
 
import org.apache.http.entity.StringEntity;
import org.apache.http.impl.client.CloseableHttpClient;
import org.apache.http.impl.client.HttpClients;
import org.apache.http.impl.conn.PoolingHttpClientConnectionManager;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
 
import java.nio.charset.Charset;
/**
 * @author dataochen
 * @Description
* @date: 2017/11/7 17:49
 */
public class HttpRequestUtil {
    private static CloseableHttpClient httpClient;
    static {
        PoolingHttpClientConnectionManager cm = new PoolingHttpClientConnectionManager();
cm.setMaxTotal(100);
 
cm.setDefaultMaxPerRoute(20);
cm.setDefaultMaxPerRoute(50);
httpClient = HttpClients.custom().setConnectionManager(cm).build();
}

    public static String get(String url) {
        CloseableHttpResponse response = null;
BufferedReader in = null;
String result = "";
        try {
            HttpGet httpGet = new HttpGet(url);
RequestConfig requestConfig = RequestConfig.custom().setConnectTimeout(30000).setConnectionRequestTimeout(30000).setSocketTimeout(30000).build();
httpGet.setConfig(requestConfig);
httpGet.setConfig(requestConfig);
httpGet.addHeader("Content-type", "application/json; charset=utf-8");
httpGet.setHeader("Accept", "application/json");
response = httpClient.execute(httpGet);
in = new BufferedReader(new InputStreamReader(response.getEntity().getContent()));
StringBuffer sb = new StringBuffer("");
String line = "";
String NL = System.getProperty("line.separator");
            while ((line = in.readLine()) != null) {
                sb.append(line + NL);
}
            in.close();
result = sb.toString();
} catch (IOException e) {
            e.printStackTrace();
} finally {
            try {
                if (null != response) {
                    response.close();
}
            } catch (IOException e) {
                e.printStackTrace();
}
        }
        return result;
}

    public static String post(String url, String jsonString) {
        CloseableHttpResponse response = null;
BufferedReader in = null;
String result = "";
        try {
            HttpPost httpPost = new HttpPost(url);
RequestConfig requestConfig = RequestConfig.custom().setConnectTimeout(30000).setConnectionRequestTimeout(30000).setSocketTimeout(30000).build();
httpPost.setConfig(requestConfig);
httpPost.setConfig(requestConfig);
httpPost.addHeader("Content-type", "application/json; charset=utf-8");
httpPost.setHeader("Accept", "application/json");
httpPost.setEntity(new StringEntity(jsonString, Charset.forName("UTF-8")));
response = httpClient.execute(httpPost);
in = new BufferedReader(new InputStreamReader(response.getEntity().getContent()));
StringBuffer sb = new StringBuffer("");
String line = "";
String NL = System.getProperty("line.separator");
            while ((line = in.readLine()) != null) {
                sb.append(line + NL);
}
            in.close();
result = sb.toString();
} catch (IOException e) {
            e.printStackTrace();
} finally {
            try {
                if (null != response) {
                    response.close();
}
            } catch (IOException e) {
                e.printStackTrace();
}
        }
        return result;
}

}

程式碼所用jar包maven座標：

<!-- https://mvnrepository.com/artifact/org.apache.httpcomponents/httpclient -->
<dependency>
    <groupId>org.apache.httpcomponents</groupId>
    <artifactId>httpclient</artifactId>
    <version>4.5.3</version>
</dependency>

<!-- https://mvnrepository.com/artifact/org.apache.httpcomponents/httpcore -->
<dependency>
    <groupId>org.apache.httpcomponents</groupId>
    <artifactId>httpcore</artifactId>
    <version>4.4.8</version>
</dependency>

宣告：此專案僅是拋磚引玉，內容不是特別完善。如有轉載，請註明此處。