HttpClient之GET请求

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";

@Test
public 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";

@Test
public 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();
}
}
}
}
}