使用httpClient处理get请求或post请求

另外一个版本: http://www.cnblogs.com/wenbronk/p/6671928.html

在java代码中调用http请求, 并将返回的参数进行处理

get请求:

    public static String doGet(String getUrl) throws IOException {
        String str = null;
        try {
            CloseableHttpClient httpclient = HttpClients.createDefault();
//        HttpClient httpclient = new DefaultHttpClient();
            // HttpGet("http://www.wenbronk.com/geosot-basis/getGeoNum?lng=21.12&lat=1&geoLevel=17");
            HttpGet httpgets = new HttpGet(getUrl);
            HttpResponse response = httpclient.execute(httpgets);
            HttpEntity entity = response.getEntity();
            if (entity != null) {
                InputStream instreams = entity.getContent();
                str = convertStreamToString(instreams);
                httpgets.abort();
            }
        }catch (Exception e) {

        }
        return str;
    }

最开始使用了过时的类DefaultHttpClient, 结果引发一大堆问题, 后台改成了CloseableHttpClient

post请求: 传入参数为字符串, 这里为业务需求所以传入的为json格式的字符串

    private static String doPost(String postUrl, JSONObject jsonObj) throws ClientProtocolException, IOException {
        CloseableHttpClient httpclient = HttpClients.createDefault();
//        HttpClient httpclient = new DefaultHttpClient();
        HttpPost post = new HttpPost(postUrl);
        post.setHeader("Content-Type", "application/json");
        post.addHeader("Authorization", "Basic YWRtaW46");
        String str = null;
        StringEntity s = new StringEntity(jsonObj.toString(), "utf-8");
        s.setContentEncoding(new BasicHeader(HTTP.CONTENT_TYPE, "application/json"));
        post.setEntity(s);
        CloseableHttpResponse response = httpclient.execute(post);
        HttpEntity entity = response.getEntity();
        if (entity != null) {
            InputStream instreams = entity.getContent();
            str = convertStreamToString(instreams);
            post.abort();
        }
        System.out.println(str);
        return str;
    }

响应信息处理类:

    private static String convertStreamToString(InputStream is) {
        BufferedReader reader = new BufferedReader(new InputStreamReader(is));
        StringBuilder sb = new StringBuilder();
        String line = null;
        try {
            while ((line = reader.readLine()) != null) {
                sb.append(line + "\n");
            }
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            try {
                is.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
        return sb.toString();
    }

2017/3/1: 后因频繁调用次数过多, 加入HttpClient连接池

package com.iwhere.util;

import java.io.IOException;
import java.io.InterruptedIOException;
import java.net.UnknownHostException;

import javax.net.ssl.SSLException;
import javax.net.ssl.SSLHandshakeException;

import org.apache.http.HttpEntityEnclosingRequest;
import org.apache.http.HttpRequest;
import org.apache.http.NoHttpResponseException;
import org.apache.http.client.HttpRequestRetryHandler;
import org.apache.http.client.protocol.HttpClientContext;
import org.apache.http.config.Registry;
import org.apache.http.config.RegistryBuilder;
import org.apache.http.conn.ConnectTimeoutException;
import org.apache.http.conn.socket.ConnectionSocketFactory;
import org.apache.http.conn.socket.LayeredConnectionSocketFactory;
import org.apache.http.conn.socket.PlainConnectionSocketFactory;
import org.apache.http.conn.ssl.SSLConnectionSocketFactory;
import org.apache.http.impl.client.CloseableHttpClient;
import org.apache.http.impl.client.HttpClients;
import org.apache.http.impl.conn.PoolingHttpClientConnectionManager;
import org.apache.http.protocol.HttpContext;

public class HttpClientPool {

    public static CloseableHttpClient getHttpClient() {
        ConnectionSocketFactory plainsf = PlainConnectionSocketFactory.getSocketFactory();
        LayeredConnectionSocketFactory sslsf = SSLConnectionSocketFactory.getSocketFactory();
        Registry<ConnectionSocketFactory> registry = RegistryBuilder.<ConnectionSocketFactory>create()
                .register("http", plainsf)
                .register("https", sslsf)
                .build();
        PoolingHttpClientConnectionManager cm = new PoolingHttpClientConnectionManager(registry);
        // 将最大连接数增加到200
        cm.setMaxTotal();
        // 将每个路由基础的连接增加到20
        cm.setDefaultMaxPerRoute();
        // 将目标主机的最大连接数增加到50
//        HttpHost localhost = new HttpHost("http://dev.iwhere.com",8010);
//        cm.setMaxPerRoute(new HttpRoute(localhost), 70);

        //请求重试处理
        HttpRequestRetryHandler httpRequestRetryHandler = new HttpRequestRetryHandler() {
            public boolean retryRequest(IOException exception,int executionCount, HttpContext context) {
                if (executionCount >= ) {// 如果已经重试了5次，就放弃
                    return false;
                }
                if (exception instanceof NoHttpResponseException) {// 如果服务器丢掉了连接，那么就重试
                    return true;
                }
                if (exception instanceof SSLHandshakeException) {// 不要重试SSL握手异常
                    return false;
                }
                if (exception instanceof InterruptedIOException) {// 超时
                    return false;
                }
                if (exception instanceof UnknownHostException) {// 目标服务器不可达
                    return false;
                }
                if (exception instanceof ConnectTimeoutException) {// 连接被拒绝
                    return false;
                }
                if (exception instanceof SSLException) {// ssl握手异常
                    return false;
                }

                HttpClientContext clientContext = HttpClientContext.adapt(context);
                HttpRequest request = clientContext.getRequest();
                // 如果请求是幂等的，就再次尝试
                if (!(request instanceof HttpEntityEnclosingRequest)) {
                    return true;
                }
                return false;
            }
        };  

        return HttpClients.custom().setConnectionManager(cm).setRetryHandler(httpRequestRetryHandler).build();
    }

}