Apache HttpClient教程

1、引入依赖

<dependency>
			<groupId>org.apache.httpcomponents</groupId>
			<artifactId>httpclient</artifactId>
			<version>4.5.2</version>
		</dependency>

 

2、HttpUtil

import org.apache.http.auth.AuthScope;
import org.apache.http.auth.UsernamePasswordCredentials;
import org.apache.http.client.CredentialsProvider;
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.ContentType;
import org.apache.http.entity.StringEntity;
import org.apache.http.impl.client.BasicCredentialsProvider;
import org.apache.http.impl.client.CloseableHttpClient;
import org.apache.http.impl.client.HttpClientBuilder;
import org.apache.http.impl.client.HttpClients;
import org.apache.http.util.EntityUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.io.IOException;

public class HttpUtil {
    private static final Logger logger = LoggerFactory.getLogger(HttpUtil.class);

    public static CloseableHttpClient getHttpClient(String username,String password){
        HttpClientBuilder httpClientBuilder = HttpClientBuilder.create();

        // 设置BasicAuth
        CredentialsProvider provider = new BasicCredentialsProvider();
        // Create the authentication scope
        AuthScope scope = new AuthScope(AuthScope.ANY_HOST, AuthScope.ANY_PORT, AuthScope.ANY_REALM);
        // Create credential pair，在此处填写用户名和密码
        UsernamePasswordCredentials credentials = new UsernamePasswordCredentials(username,password);
        // Inject the credentials
        provider.setCredentials(scope, credentials);
        // Set the default credentials provider
        httpClientBuilder.setDefaultCredentialsProvider(provider);
        // HttpClient
        CloseableHttpClient httpClient = httpClientBuilder.build();
        return httpClient;
    }

    public static CloseableHttpClient getHttpClient(){
        CloseableHttpClient httpClient = HttpClients.createDefault();
        return httpClient;
    }


    public static String sendPost(CloseableHttpClient httpclient,String url,String jsonParam){
        HttpPost httpPost = new HttpPost(url);
        httpPost.setHeader("Content-Type", "application/json;charset=UTF-8");
        
        // json格式参数
        // StringEntity entity = new StringEntity(jsonParam, ContentType.APPLICATION_JSON);

        // 普通key-value参数
        List<NameValuePair> params = new ArrayList<>();
        params.add( new BasicNameValuePair("bookId",String.valueOf(bookId)));
        params.add( new BasicNameValuePair("userId",String.valueOf(userId)));
        UrlEncodedFormEntity entity = new UrlEncodedFormEntity(params,"utf-8");


        httpPost.setEntity(entity);
        CloseableHttpResponse response = null;
        try {
            response = httpclient.execute(httpPost);
        } catch (IOException e) {
            logger.error("post请求发送失败",e);
            return null;
        }
        int statusCode = response.getStatusLine().getStatusCode();
        logger.info("post请求发送成功，响应码："+statusCode);

        try {
            String result = EntityUtils.toString(response.getEntity(), "UTF-8");
            return result;
        } catch (IOException e) {
            logger.error("获取响应体失败：",e);
            return null;
        } finally {
            try {
                response.close();
                httpclient.close();
            } catch (IOException e) {
                logger.error("资源关闭失败",e);
            }

        }

    }

    public static String sendGet(CloseableHttpClient httpclient,String url){
        HttpGet httpGet = new HttpGet(url);
        CloseableHttpResponse response = null;
        try {
            response = httpclient.execute(httpGet);
        } catch (IOException e) {
            logger.error("get请求发送失败",e);
            return null;
        }
        int statusCode = response.getStatusLine().getStatusCode();
        logger.info("post请求发送成功，响应码："+statusCode);

        try {
            String result = EntityUtils.toString(response.getEntity(), "UTF-8");
            return result;
        } catch (IOException e) {
            logger.error("获取响应体失败：",e);
            return null;
        } finally {
            try {
                response.close();
                httpclient.close();
            } catch (IOException e) {
                logger.error("资源关闭失败",e);
            }
        }
    }



}