java中如何使用HttpClient调用接口

 public static String sendPutForm(String url,  Map<String,String> map, String encoding) throws ParseException, IOException {
        String body = "";
        // 打印了一下我推送的json数据
        log.info("我推送的json数据:" + map);
        log.info("我推送的url:" + url);
        CloseableHttpResponse response = null;
        ///获得Http客户端
        CloseableHttpClient client = HttpClients.createDefault();
        List<NameValuePair> parameters = new ArrayList<NameValuePair>();
        for (Map.Entry<String, String> entry : map.entrySet()) {
            System.out.println("key = " + entry.getKey() + ", value = " + entry.getValue());
            parameters.add(new BasicNameValuePair(entry.getKey(),entry.getValue()));
        }
        UrlEncodedFormEntity formEntity = new UrlEncodedFormEntity(parameters);
		// 配置信息
		// 设置连接超时时间(单位毫秒)
		// 设置请求超时时间(单位毫秒）
		// socket读写超时时间(单位毫秒)
        RequestConfig requestConfig = RequestConfig.custom()
                .setConnectTimeout(50000).setConnectionRequestTimeout(50000)
                .setSocketTimeout(50000).build();
        // 向指定资源位置上传内容// 创建Post请求
        HttpPost httpPost = new HttpPost(url);
        httpPost.setConfig(requestConfig);
        httpPost.addHeader("Content-Type", "application/x-www-form-urlencoded;charset=utf-8");
        httpPost.setEntity(formEntity);
        try {
            response = client.execute(httpPost);
            // 通过response中的getEntity()方法获取返回值
            HttpEntity entity = response.getEntity();
            if (entity != null) {
                body = EntityUtils.toString(entity, encoding);
            }
        } catch (Exception e) {
            // TODO: handle exception
            e.printStackTrace();
        } finally {
            httpPost.abort();
            if (response != null) {
                EntityUtils.consumeQuietly(response.getEntity());
            }
        }
        log.info("body:" + body);
        return body;
    }

<!-- httpClient -->
        <dependency>
            <groupId>org.apache.httpcomponents</groupId>
            <artifactId>httpclient</artifactId>
            <version>4.5.3</version>
        </dependency>

import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.net.URL;
import java.util.Map;
import java.util.Properties;
 
import org.apache.http.client.methods.CloseableHttpResponse;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.impl.client.CloseableHttpClient;
import org.apache.http.impl.client.HttpClients;
import org.apache.http.util.EntityUtils;
 
public class APIUtil {
 
	/**
	 * 返回API调用结果
	 * @param APIName 接口在api.properties中的名称
	 * @param params 访问api所需的参数及参数值
	 * @return 此处返回的是JSON格式的数据
	 */
	public static String API(String APIName, Map<String, Object> params) {
		 String content = "";
		 //请求结果  
                CloseableHttpResponse response = null;  
		//实例化httpclient  
                CloseableHttpClient httpclient = HttpClients.createDefault();  
       
            try {
        	 //读取配置文件的URL
                Properties properties = new Properties();
                URL fileURL = APIUtil.class.getClassLoader().getResource("api.properties");
		properties.load(new FileInputStream(new File(fileURL.getFile())));
		String API = properties.getProperty(APIName);
	        //构造url请求
	        StringBuilder url = new StringBuilder(API);
	        if(params!=null && params.size()>0) {
	        	url.append("?");
	        	for(Map.Entry<String, Object> entry : params.entrySet()) {
	            	url.append(entry.getKey()+"="+entry.getValue()+"&");
	            }
	        	url.substring(0, url.length()-1);
	        }
	        //实例化get方法  
	        HttpGet httpget = new HttpGet(url.toString()); 
	        //执行get请求
		response = httpclient.execute(httpget);
		if(response.getStatusLine().getStatusCode()==200) {
			content = EntityUtils.toString(response.getEntity(),"utf-8");
		}
	} catch (IOException e) {
		e.printStackTrace();
	}
        return content;
    }	
}