Java HttpUtil

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1 Maven引用

    org.apache.httpcomponents
    httpclient
    4.5.3


2 参考地址
http://hc.apache.org/


3 HttpUtil

import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.ResponseHandler;
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.BasicResponseHandler;
import org.apache.http.impl.client.CloseableHttpClient;
import org.apache.http.impl.client.HttpClients;
import org.apache.http.util.EntityUtils;

import java.io.IOException;

/**
 * @author Administrator
 * @version 1.0.0
 * @description Http传输工具
 * @datetime 2017/4/15 18:09
 */
public class HttpUtil {

    /**
     * This example
     * the process of processing the HTTP response and releasing associated resources.
     */
    public static void httpGet() throws IOException {
        CloseableHttpClient httpclient = HttpClients.createDefault();
        try {
            HttpGet httpget = new HttpGet("http://httpbin.org/");

            System.out.println("Executing request " + httpget.getRequestLine());

            // Create a custom response handler
            ResponseHandler responseHandler = new ResponseHandler() {

                @Override
                public String handleResponse(
                        final HttpResponse response) throws ClientProtocolException, IOException {
                    int status = response.getStatusLine().getStatusCode();
                    if (status >= 200 && status < 300) {
                        HttpEntity entity = response.getEntity();
                        return entity != null ? EntityUtils.toString(entity) : null;
                    } else {
                        throw new ClientProtocolException("Unexpected response status: " + status);
                    }
                }

            };
            String responseBody = httpclient.execute(httpget, responseHandler);
            System.out.println("----------------------------------------");
            System.out.println(responseBody);
        } finally {
            httpclient.close();
        }
    }


    /**
     * post json格式的字符串
     * @throws IOException
     */
    public static void httpPost() throws IOException {
        CloseableHttpClient httpclient = HttpClients.createDefault();

        try {
            HttpPost httppost = new HttpPost("http://httpbin.org/");

            //Interface HttpEntity
            //AbstractHttpEntity, BasicHttpEntity, BufferedHttpEntity, ByteArrayEntity, EntityTemplate, FileEntity, HttpEntityWrapper, InputStreamEntity, SerializableEntity, StringEntity
            httppost.setEntity(new StringEntity("{a:123}", ContentType.APPLICATION_JSON));
            System.out.println("Executing request " + httppost.getRequestLine());

            //All Known ResponseHandler Implementing Classes:
            //AbstractResponseHandler, BasicResponseHandler
            String responseBody = httpclient.execute(httppost, new BasicResponseHandler());
            System.out.println("----------------------------------------");
            System.out.println(responseBody);
        } finally {
            httpclient.close();
        }
    }


}