Java之网络请求工具类(依赖：org.apache.http;注：HttpClient 4.4,HttpCore 4.4)

到此处可以去下载依赖包：http://hc.apache.org/downloads.cgi 

import java.util.List;

import org.apache.http.HttpStatus;
import org.apache.http.NameValuePair;
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.impl.client.CloseableHttpClient;
import org.apache.http.impl.client.HttpClients;
import org.apache.http.util.EntityUtils;

/**
 * HttpServletUtil
 *
 * @author ysj
 * @Date: 2015-1-30 下午2:07:55
 */
public class HttpServletUtil {
    private static CloseableHttpClient httpclient;
    private static RequestConfig requestConfig = RequestConfig.custom().setSocketTimeout(5000).setConnectTimeout(5000).build();

    /**
     * Post:访问数据库并返回数据字符串
     * 
     * @param params
     *            向服务器端传的参数
     * @param url
     * @return String 数据字符串
     * @throws Exception
     */
    public static String doPost(List<NameValuePair> params, String url) throws Exception {
        String result = null;
        httpclient = HttpClients.createDefault();
        HttpPost httpPost = new HttpPost(url);
        httpPost.setEntity(new UrlEncodedFormEntity(params));
        //设置请求和传输超时时间
        httpPost.setConfig(requestConfig);
        CloseableHttpResponse httpResp = httpclient.execute(httpPost);
        try {
            int statusCode = httpResp.getStatusLine().getStatusCode();
            // 判断是够请求成功
            if (statusCode == HttpStatus.SC_OK) {
                System.out.println("状态码:" + statusCode);
                System.out.println("请求成功!");
                // 获取返回的数据
                result = EntityUtils.toString(httpResp.getEntity(), "UTF-8");
            } else {
                System.out.println("状态码:"
                        + httpResp.getStatusLine().getStatusCode());
                System.out.println("HttpPost方式请求失败!");
            }
        } finally {
            httpResp.close();
            httpclient.close();
        }
        return result;
    }

    /**
     * Get:访问数据库并返回数据字符串
     * 
     * @param url
     * @return String 数据字符串
     * @throws Exception
     */
     public static String doGet(String url) throws Exception{
        String result = null;
        httpclient = HttpClients.createDefault();
        HttpGet httpGet = new HttpGet(url);
        //设置请求和传输超时时间
        httpGet.setConfig(requestConfig);
        CloseableHttpResponse httpResp = httpclient.execute(httpGet);
        try {
            int statusCode = httpResp.getStatusLine().getStatusCode();
            // 判断是够请求成功
            if (statusCode == HttpStatus.SC_OK) {
                System.out.println("状态码:" + statusCode);
                System.out.println("请求成功!");
                // 获取返回的数据
                result = EntityUtils.toString(httpResp.getEntity(), "UTF-8");
            } else {
                System.out.println("状态码:"
                        + httpResp.getStatusLine().getStatusCode());
                System.out.println("HttpGet方式请求失败!");
            }
        } finally {
            httpResp.close();
            httpclient.close();
        }
        return result;
     }
}