JavaEE或者Android的开发者对HttpClient一定不陌生，实际上这是一个在项目中经常被用到的框架，框架本身用法很简单，网上有很多这方面的资料，这里只是一个简单的使用总结。

当在实际的项目开发中需要作为客户端发送HTTP请求时，HttpClient是个不错的选择，下面简单介绍两种GET请求。

方法一，直接拼接参数

package com.zws.httpclient;import java.io.IOException;import org.apache.http.HttpEntity;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.methods.CloseableHttpResponse;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.impl.client.CloseableHttpClient;
import org.apache.http.impl.client.HttpClients;
import org.apache.http.util.EntityUtils;
import org.junit.Test;public class ClientGet {static String uri = "http://localhost:8080/resteasy/rest/user/";static String CHAR_SET = "UTF-8";@Testpublic void get0() {String path = "getUserDetail2?userId=23&status=1";//直接拼接参数CloseableHttpClient client = HttpClients.createDefault();HttpGet get = new HttpGet(getUri(path));CloseableHttpResponse resp = null;try {resp = client.execute(get);int code = resp.getStatusLine().getStatusCode();//响应码System.out.println("resp code:" + code);HttpEntity entity = resp.getEntity();String msg = EntityUtils.toString(entity, CHAR_SET);//响应信息System.out.println("receive msg:" + msg);} catch (ClientProtocolException e) {e.printStackTrace();} catch (IOException e) {e.printStackTrace();} finally {if (resp != null) {try {resp.close();} catch (IOException e) {e.printStackTrace();}}}}public String getUri(String path) {return uri + path;}
}

方法二，利用URIBuilder辅助构造URI

package com.zws.httpclient;import java.io.IOException;
import java.net.URI;
import java.net.URISyntaxException;import org.apache.http.HttpEntity;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.methods.CloseableHttpResponse;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.client.utils.URIBuilder;
import org.apache.http.impl.client.CloseableHttpClient;
import org.apache.http.impl.client.HttpClients;
import org.apache.http.util.EntityUtils;
import org.junit.Test;public class ClientGet {static String uri = "http://localhost:8080/resteasy/rest/user/";static String CHAR_SET = "UTF-8";@Testpublic void get1() {String path = "/resteasy/rest/user/getUserDetail2";CloseableHttpClient client = HttpClients.createDefault();CloseableHttpResponse resp = null;try {URIBuilder url = new URIBuilder();url.setScheme("http");url.setHost("localhost:8080");url.setPath(path);url.setParameter("userId", "23");url.setParameter("status", "1");URI uri = url.build();    System.out.println("url:" + uri.toString());HttpGet get = new HttpGet(uri);resp = client.execute(get);int code = resp.getStatusLine().getStatusCode();System.out.println("resp code:" + code);HttpEntity entity = resp.getEntity();String msg = EntityUtils.toString(entity, CHAR_SET);System.out.println("receive msg:" + msg);} catch (URISyntaxException e) {e.printStackTrace();} catch (ClientProtocolException e) {e.printStackTrace();} catch (IOException e) {e.printStackTrace();} finally {if (resp != null) {try {resp.close();} catch (IOException e) {e.printStackTrace();}}}}
}