Java网络请求工具类详解编程语言

Java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; 
     } 
}