大家好，又见面了，我是你们的朋友全栈君。
HttpClient 是apache 组织下面的一个用于处理HTTP 请求和响应的开源工具。所用jar包为httpclient-4.3.6.jar、httpcore-4.3.3.jar、httpmime-4.3.6.jar、commons-codec-1.6.jar。
发送Get请求代码如下：
package com.zkn.newlearn.httpclient;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.util.List;
import org.apache.http.Consts;
import org.apache.http.HttpEntity;
import org.apache.http.NameValuePair;
import org.apache.http.ParseException;
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.impl.client.CloseableHttpClient;
import org.apache.http.impl.client.HttpClients;
import org.apache.http.message.BasicNameValuePair;
import org.apache.http.util.EntityUtils;
import com.google.common.collect.Lists;
public class HttpClientTest02 {
public static void main(String[] args) {
CloseableHttpClient httpClient = HttpClients.createDefault();
CloseableHttpResponse response = null;
InputStream is = null;
String url = "http://localhost:8080/MyWebxTest/getCityByProvinceEname.do";
//封装请求参数
List<NameValuePair> params = Lists.newArrayList();
params.add(new BasicNameValuePair("cityEname", "henan"));
String str = "";
try {
//转换为键值对
str = EntityUtils.toString(new UrlEncodedFormEntity(params, Consts.UTF_8));
System.out.println(str);
//创建Get请求
HttpGet httpGet = new HttpGet(url+"?"+str);
//执行Get请求，
response = httpClient.execute(httpGet);
//得到响应体
HttpEntity entity = response.getEntity();
if(entity != null){
is = entity.getContent();
//转换为字节输入流
BufferedReader br = new BufferedReader(new InputStreamReader(is, Consts.UTF_8));
String body = null;
while((body=br.readLine()) != null){
System.out.println(body);
}
}
} catch (ParseException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
} finally{
//关闭输入流，释放资源
if(is != null){
try {
is.close();
} catch (IOException e) {
e.printStackTrace();
}
}
//消耗实体内容
if(response != null){
try {
response.close();
} catch (IOException e) {
e.printStackTrace();
}
}
//关闭相应 丢弃http连接
if(httpClient != null){
try {
httpClient.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
}
}
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