HttpClientUtil工具类

 依赖

　　org.apache.httpcomponents
　　httpclient
　　4.5.2

 

HttpClientUtil.java

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

import org.apache.http.NameValuePair;
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.impl.client.HttpClients;
import org.apache.http.message.BasicNameValuePair;
import org.apache.http.util.EntityUtils;

public class HttpClientUtil {
	
	public static String doGet(String url) {							// 无参数get请求
		return doGet(url, null);
	}

	public static String doGet(String url, Map param) {	// 带参数get请求
		CloseableHttpClient httpClient = HttpClients.createDefault();	// 创建一个默认可关闭的Httpclient 对象
		String resultMsg = "";											// 设置返回值
		CloseableHttpResponse response = null;							// 定义HttpResponse 对象
		try {
			URIBuilder builder = new URIBuilder(url);					// 创建URI,可以设置host，设置参数等
			if (param != null) {
				for (String key : param.keySet()) {
					builder.addParameter(key, param.get(key));
				}
			}
			URI uri = builder.build();
			HttpGet httpGet = new HttpGet(uri);							// 创建http GET请求
			response = httpClient.execute(httpGet);						// 执行请求
			if (response.getStatusLine().getStatusCode() == 200) {		// 判断返回状态为200则给返回值赋值
				resultMsg = EntityUtils.toString(response.getEntity(), "UTF-8");
			}
		} catch (Exception e) {
			e.printStackTrace();
		} finally {														// 不要忘记关闭
			try {
				if (response != null) {
					response.close();
				}
				httpClient.close();
			} catch (IOException e) {
				e.printStackTrace();
			}
		}
		return resultMsg;
	}
	
	public static String doPost(String url) {							// 无参数post请求
		return doPost(url, null);
	}

	public static String doPost(String url, Map param) {// 带参数post请求
		CloseableHttpClient httpClient = HttpClients.createDefault();	// 创建一个默认可关闭的Httpclient 对象
		CloseableHttpResponse response = null;
		String resultMsg = "";
		try {
			HttpPost httpPost = new HttpPost(url);						// 创建Http Post请求
			if (param != null) {										// 创建参数列表
				List paramList = new ArrayList();
				for (String key : param.keySet()) {
					paramList.add(new BasicNameValuePair(key, param.get(key)));
				}
				UrlEncodedFormEntity entity = new UrlEncodedFormEntity(paramList);// 模拟表单
				httpPost.setEntity(entity);
			}
			response = httpClient.execute(httpPost);					// 执行http请求
			if (response.getStatusLine().getStatusCode() == 200) {
				resultMsg = EntityUtils.toString(response.getEntity(), "utf-8");
			}
		} catch (Exception e) {
			e.printStackTrace();
		} finally {
			try {
				if (response != null) {
					response.close();
				}
				httpClient.close();
			} catch (IOException e) {
				e.printStackTrace();
			}
		}
		return resultMsg;
	}

	public static String doPostJson(String url, String json) {
		CloseableHttpClient httpClient = HttpClients.createDefault();
		CloseableHttpResponse response = null;
		String resultString = "";
		try {
			HttpPost httpPost = new HttpPost(url);
			StringEntity entity = new StringEntity(json, ContentType.APPLICATION_JSON);
			httpPost.setEntity(entity);
			response = httpClient.execute(httpPost);
			if (response.getStatusLine().getStatusCode() == 200) {
				resultString = EntityUtils.toString(response.getEntity(), "utf-8");
			}
		} catch (Exception e) {
			e.printStackTrace();
		} finally {
			try {
				if (response != null) {
					response.close();
				}
				httpClient.close();
			} catch (IOException e) {
				e.printStackTrace();
			}
		}
		return resultString;
	}
}

 http://www.365jz.com/article/24634