HttpClientService

httpclient

import org.apache.http.NameValuePair;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.config.RequestConfig;
import org.apache.http.client.entity.UrlEncodedFormEntity;
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.client.utils.URIBuilder;
import org.apache.http.entity.ContentType;
import org.apache.http.entity.StringEntity;
import org.apache.http.impl.client.CloseableHttpClient;
import org.apache.http.message.BasicNameValuePair;
import org.apache.http.util.EntityUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import java.io.IOException;
import java.net.URISyntaxException;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;
@Service
public class HttpClientService {
    @Autowired
    private CloseableHttpClient httpClient;
    @Autowired
    private RequestConfig requestConfig;
    /**
     * 执行GET请求
     * 
     * @param url
     * @return
     * @throws IOException
     * @throws ClientProtocolException
     */
    public String doGet(String url) throws ClientProtocolException, IOException {
        // 创建http GET请求
        HttpGet httpGet = new HttpGet(url);
        httpGet.setConfig(this.requestConfig);
        CloseableHttpResponse response = null;
        try {
            // 执行请求
            response = httpClient.execute(httpGet);
            // 判断返回状态是否为200
            if (response.getStatusLine().getStatusCode() == 200) {
                return EntityUtils.toString(response.getEntity(), "UTF-8");
            }
        } finally {
            if (response != null) {
                response.close();
            }
        }
        return null;
    }
    /**
     * 带有参数的GET请求
     * 
     * @param url
     * @param params
     * @return
     * @throws URISyntaxException
     * @throws IOException
     * @throws ClientProtocolException
     */
    public String doGet(String url, Map<String, String> params)
            throws ClientProtocolException, IOException, URISyntaxException {
        URIBuilder uriBuilder = new URIBuilder(url);
        for (String key : params.keySet()) {
            uriBuilder.addParameter(key, params.get(key));
        }
        return this.doGet(uriBuilder.build().toString());
    }
    /**
     * 执行POST请求
     * 
     * @param url
     * @param params
     * @return
     * @throws IOException
     */
    public String doPost(String url, Map<String, String> params) throws IOException {
        // 创建http POST请求
        HttpPost httpPost = new HttpPost(url);
        httpPost.setConfig(this.requestConfig);
        if (params != null) {
            // 设置2个post参数，一个是scope、一个是q
            List<NameValuePair> parameters = new ArrayList<NameValuePair>();
            for (String key : params.keySet()) {
                parameters.add(new BasicNameValuePair(key, params.get(key)));
            }
            // 构造一个form表单式的实体
            UrlEncodedFormEntity formEntity = new UrlEncodedFormEntity(parameters, "UTF-8");
            // 将请求实体设置到httpPost对象中
            httpPost.setEntity(formEntity);
        }
        CloseableHttpResponse response = null;
        try {
            // 执行请求
            response = httpClient.execute(httpPost);
            return EntityUtils.toString(response.getEntity(), "UTF-8");
        } finally {
            if (response != null) {
                response.close();
            }
        }
    }
    /**
     * 执行POST请求
     * 
     * @param url
     * @return
     * @throws IOException
     */
    public String doPost(String url) throws IOException {
        return this.doPost(url, null);
    }
    /**
     * 提交json数据
     * 
     * @param url
     * @param json
     * @return
     * @throws ClientProtocolException
     * @throws IOException
     */
    public String doPostJson(String url, String json) throws ClientProtocolException, IOException {
        // 创建http POST请求
        HttpPost httpPost = new HttpPost(url);
        httpPost.setConfig(this.requestConfig);
        if (json != null) {
            // 构造一个form表单式的实体
            StringEntity stringEntity = new StringEntity(json, ContentType.APPLICATION_JSON);
            // 将请求实体设置到httpPost对象中
            httpPost.setEntity(stringEntity);
        }
        CloseableHttpResponse response = null;
        try {
            // 执行请求
            response = this.httpClient.execute(httpPost);
            return EntityUtils.toString(response.getEntity(), "UTF-8");
        } finally {
            if (response != null) {
                response.close();
            }
        }
    }
}

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