HttpClientUtils GET POST

package com.szlanyou.busicen.usc.org.uitl;

import java.io.BufferedReader; import java.io.IOException; import java.io.InputStreamReader; import java.net.URI; import java.util.ArrayList; import java.util.Iterator; import java.util.List; import java.util.Map;

import org.apache.http.HttpEntity; import org.apache.http.HttpResponse; import org.apache.http.HttpStatus; import org.apache.http.NameValuePair; import org.apache.http.StatusLine; import org.apache.http.client.HttpClient; 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.entity.StringEntity; import org.apache.http.impl.client.CloseableHttpClient; import org.apache.http.impl.client.DefaultHttpClient; import org.apache.http.impl.client.HttpClients; import org.apache.http.message.BasicNameValuePair; import org.apache.http.protocol.HTTP; import org.apache.http.util.EntityUtils; import org.slf4j.Logger; import org.slf4j.LoggerFactory;

/**

• @Author D
• @Time 2022年8月2日 上午11:23:12
• @Version 1.0

•      <p>
  

•      Description:
  

•      </p>
  

*/ public class HttpClientUtils {

private static Logger log = LoggerFactory.getLogger(HttpClientUtils.class);

/**
 * get请求
 * 
 * @return
 */
public static String doGet(String url) {
	try {
		HttpClient client = new DefaultHttpClient();
		// 发送get请求
		HttpGet request = new HttpGet(url);
		HttpResponse response = client.execute(request);

		/** 请求发送成功，并得到响应 **/
		if (response.getStatusLine().getStatusCode() == HttpStatus.SC_OK) {
			/** 读取服务器返回过来的json字符串数据 **/
			String strResult = EntityUtils.toString(response.getEntity());

			return strResult;
		}
	} catch (IOException e) {
		e.printStackTrace();
	}

	return null;
}

/**
 * post请求(用于key-value格式的参数)
 * 
 * @param url
 * @param params
 * @return
 */
public static String doPost(String url, Map params) {

	BufferedReader in = null;
	try {
		// 定义HttpClient
		HttpClient client = new DefaultHttpClient();
		// 实例化HTTP方法
		HttpPost request = new HttpPost();
		request.setURI(new URI(url));

		// 设置参数
		List<NameValuePair> nvps = new ArrayList<NameValuePair>();
		for (Iterator iter = params.keySet().iterator(); iter.hasNext();) {
			String name = (String) iter.next();
			String value = String.valueOf(params.get(name));
			nvps.add(new BasicNameValuePair(name, value));

			// System.out.println(name +"-"+value);
		}
		request.setEntity(new UrlEncodedFormEntity(nvps, HTTP.UTF_8));

		HttpResponse response = client.execute(request);
		int code = response.getStatusLine().getStatusCode();
		if (code == 200) { // 请求成功
			in = new BufferedReader(new InputStreamReader(response.getEntity().getContent(), "utf-8"));
			StringBuffer sb = new StringBuffer("");
			String line = "";
			String NL = System.getProperty("line.separator");
			while ((line = in.readLine()) != null) {
				sb.append(line + NL);
			}

			in.close();

			return sb.toString();
		} else { //
			System.out.println("状态码：" + code);
			return null;
		}
	} catch (Exception e) {
		e.printStackTrace();

		return null;
	}
}

/**
 * post请求（用于请求json格式的参数）
 * 
 * @param url
 * @param params
 * @return
 */
public static String doPost(String url, String params) throws Exception {

	CloseableHttpClient httpclient = HttpClients.createDefault();
	HttpPost httpPost = new HttpPost(url);// 创建httpPost
	httpPost.setHeader("Accept", "application/json");
	httpPost.setHeader("Content-Type", "application/json");
	String charSet = "UTF-8";
	StringEntity entity = new StringEntity(params, charSet);
	httpPost.setEntity(entity);
	CloseableHttpResponse response = null;

	try {

		response = httpclient.execute(httpPost);
		StatusLine status = response.getStatusLine();
		int state = status.getStatusCode();
		if (state == HttpStatus.SC_OK) {
			HttpEntity responseEntity = response.getEntity();
			String jsonString = EntityUtils.toString(responseEntity);
			return jsonString;
		} else {
			log.error("请求返回:" + state + "(" + url + ")");
		}
	} finally {
		if (response != null) {
			try {
				response.close();
			} catch (IOException e) {
				e.printStackTrace();
			}
		}
		try {
			httpclient.close();
		} catch (IOException e) {
			e.printStackTrace();
		}
	}
	return null;
}

}