java 发送 http请求——HttpClient

使用HttpClient来发送Http请求

引入两个包：^[1]org.apache.httpcomponents.httpclient_x.x.x.jar  ^[2]org.apache.httpcomponents.httpcore_x.x.x.jar

下载链接：Apache HttpComponents - HttpComponents Downloads

参考文档：^[1]HttpClient Tutorial  ^[2]HttpClient Example

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package http;

import java.io.IOException;
import java.io.InputStream;

import org.apache.http.Header;
import org.apache.http.HttpEntity;
import org.apache.http.ProtocolVersion;
import org.apache.http.StatusLine;
import org.apache.http.client.ClientProtocolException;
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.impl.client.CloseableHttpClient;
import org.apache.http.impl.client.HttpClients;



public class HttpConnector {
    public static void main(String[] args) {
        CloseableHttpClient httpClient = HttpClients.createDefault();
        RequestConfig requestConfig = RequestConfig.custom()
                .setConnectTimeout(1000)
                .setSocketTimeout(1000)
                .build();
        HttpGet get = new HttpGet("http://i.easou.com/s.m?q=电影&wver=t");
        get.setConfig(requestConfig);
        
        /*        
            HttpPost post = new HttpPost("http://i.easou.com/s.m");
            post.setConfig(requestConfig);
            List<NameValuePair> nameValuePairs = new ArrayList<NameValuePair>();
            nameValuePairs.add(new BasicNameValuePair("q", "电影"));
            nameValuePairs.add(new BasicNameValuePair("wver", "t"));
            UrlEncodedFormEntity urlEntity;
            urlEntity = new UrlEncodedFormEntity(nameValuePairs,Consts.UTF_8);
            post.setEntity(urlEntity);
        */
        CloseableHttpResponse response = null;
        try {
            response = httpClient.execute(get);
            /*
                response = httpClient.execute(post);
            */
            StatusLine statusLine = response.getStatusLine();
            ProtocolVersion protocolVersion = statusLine.getProtocolVersion();
            String reasonPhrase = statusLine.getReasonPhrase();
            int statusCode = statusLine.getStatusCode();
            System.out.println(statusLine + "
" + protocolVersion + " " + statusCode + " " + reasonPhrase);
            /*#############################################################################################*/
            HttpEntity httpEntity = response.getEntity();
            if(httpEntity != null) {
                Header contentType = httpEntity.getContentType();
                Header contentEncoding = httpEntity.getContentEncoding();
                long contentLength = httpEntity.getContentLength();
                boolean isStreaming = httpEntity.isStreaming();
                boolean isRepeatable = httpEntity.isRepeatable();
                boolean isChunked = httpEntity.isChunked();
                System.out.println(contentType + " | " + contentEncoding + " | " + contentLength + " | " + isStreaming + "/" + isRepeatable + "/" + isChunked);
                /*#############################################################################################*/
                InputStream is = httpEntity.getContent();
                byte[] buff = new byte[512];
                while(is.read(buff) > 0) {
                    for(byte b : buff) {
                        System.out.print((char) b);
                    }
                }
                is.close();
                /*#############################################################################################*/
            }
        } catch (ClientProtocolException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            if(response != null) {
                try {
                    response.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }
        try {
            httpClient.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
    
}