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

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;
}
}