the difference
1, HttpURLConnection is standard java classes, packages do not use up compared to the original
2, HttpClient is open source framework, encapsulates access the HTTP request header, parameters, the contents thereof, and the like in response; HttpURLConnection input and output flow of operation in this interface are collectively packaged in a HttpPost (HttpGet) and HttpResponse. Thus, eliminating the trouble in operation.
And are given below HttpURLConnection HttpClient achieve GET, POST request example, as learning.
(1) HttpURLConnection achieve GET
package com.jingchenyong.test;
import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.URL;
public class Test_HttpURLConnection_GET
{
public static void main(String[] args) throws Exception
{
String urlString="http://15.6.46.35:8080/platform/index.html";
URL url=new URL(urlString);
HttpURLConnection conn = (HttpURLConnection)url.openConnection();
conn.setRequestProperty("Accept-Charset", "UTF-8");
conn.setRequestProperty("connection", "keep-Alive");
conn.setRequestMethod("GET");
conn.connect();
int code=conn.getResponseCode();
System.out.println(code);
//把流转为字符串方式一
//String result=IOUtils.toString(conn.getInputStream(),"UTF-8");
//把流转为字符串方式二
BufferedReader br=new BufferedReader(new InputStreamReader(conn.getInputStream(), "UTF-8"));
String result="";
String tmp="";
while((tmp=br.readLine())!=null){
result=result+tmp;
}
System.out.println(result);
//关闭流和连接
}
}(2) HttpURLConnection achieve POST
package com.jingchenyong.test;
import java.io.BufferedOutputStream;
import java.net.HttpURLConnection;
import java.net.URL;
import org.apache.commons.io.IOUtils;
import org.apache.commons.lang.StringUtils;
import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.JSONObject;
public class Test_HttpURLConnection_POST
{
public static void main(String[] args)
throws Exception
{
//设置连接
String urlString = "http://15.6.46.37:9200//henry/henry/_search";
URL url = new URL(urlString);
HttpURLConnection conn = (HttpURLConnection)url.openConnection();
conn.setRequestProperty("Accept-Charset", "UTF-8");
conn.setRequestProperty("connection", "keep-Alive");
conn.setRequestMethod("POST");
conn.setDoInput(true);
conn.setDoOutput(true);
conn.connect();
String jsonstring = getJOSNString();
if (StringUtils.isNotBlank(jsonstring))
{
/**
* post提交方式一
*/
/* OutputStream os = conn.getOutputStream();
BufferedWriter writer = new BufferedWriter(new OutputStreamWriter(os));
writer.write(jsonstring);
writer.flush();
writer.close();*/
BufferedOutputStream out = new BufferedOutputStream(conn.getOutputStream());
out.write(jsonstring.getBytes());
out.flush();
out.close();
//流转字符串的另一种方式见GET方式
String result=IOUtils.toString(conn.getInputStream(),"UTF-8");
System.out.println(result);
//注意关闭流和连接，这里省略
}
}
public static String getJOSNString()
{
JSONObject jsonobject = new JSONObject();
JSONObject jsonobject1 = new JSONObject();
JSONObject jsonobject2 = new JSONObject();
jsonobject2.put("name", "jingchenyong");
jsonobject1.put("match", jsonobject2);
jsonobject.put("query", jsonobject1);
String jsonstring = JSON.toJSONString(jsonobject);
return jsonstring;
}
}(3) HttpClient achieve GET
package com.jingchenyong.test;
import java.io.BufferedReader;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.util.HashMap;
import java.util.Map;
import java.util.Map.Entry;
import org.apache.commons.collections.MapUtils;
import org.apache.http.client.config.RequestConfig;
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;
public class Test_HttpClient_GET
{
public static void main(String[] args) throws Exception
{
String url="http://15.6.46.35:8080/platform/index.html";
URIBuilder builder = new URIBuilder(url);
CloseableHttpClient httpClient = HttpClients.createDefault();
Map<String,Object> map=getMap();
if(MapUtils.isNotEmpty(map)){
for(Entry<String,Object> entry:map.entrySet()){
builder.addParameter(entry.getKey(), String.valueOf(entry.getValue()));
}
url=builder.build().toString();
}
HttpGet get=new HttpGet(url);
// 增加超时设置
RequestConfig requestConfig = RequestConfig.custom().setConnectTimeout(1000).build();
get.setConfig(requestConfig);
//发送GET请求
CloseableHttpResponse response=httpClient.execute(get);
//获取状态码
System.out.println(response.getStatusLine().getStatusCode());
//把结果流转为字符串方式一
/*
String result=IOUtils.toString(response.getEntity().getContent());
System.out.println(result);
*/
//把结果流转为字符串方式二
StringBuilder reMsgBuider = new StringBuilder();
InputStream in = response.getEntity().getContent();
BufferedReader reader = new BufferedReader(new InputStreamReader(in, "UTF-8"));
String msg = null;
// 读取返回消息体
while ((msg = reader.readLine()) != null) {
reMsgBuider.append(msg);
}
String result = reMsgBuider.toString();
System.out.println(result);
//关闭流和连接
}
public static Map<String,Object> getMap(){
Map<String,Object> map=new HashMap<String,Object>();
//map.put("name", "jingchenyong");
//map.put("age", 26);
return map;
}
}(4) HttpClient achieve POST
package com.jingchenyong.test;
import org.apache.commons.io.IOUtils;
import org.apache.http.client.config.RequestConfig;
import org.apache.http.client.methods.CloseableHttpResponse;
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.HttpClients;
import org.apache.http.util.EntityUtils;
import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.JSONObject;
public class Test_HttpClient_POST
{
public static void main(String[] args) throws Exception{
String jsonstring=getJOSNString();
RequestConfig config = RequestConfig.custom().setSocketTimeout(30000).setConnectTimeout(30000).build();
CloseableHttpClient client = HttpClients.custom().setDefaultRequestConfig(config).build();
HttpPost post = new HttpPost("http://15.6.46.37:9200//henry/henry/_search");
//填充post体
post.setEntity(new StringEntity(jsonstring,"UTF-8"));
CloseableHttpResponse response = client.execute(post);
System.out.println("状态码为："+response.getStatusLine().getStatusCode());
//方式一
//System.out.println("获取的结果为(获取方式一)："+IOUtils.toString(response.getEntity().getContent()));
//方式二 见GET
//方式三
System.out.println("获取的结果为(获取方式二)："+EntityUtils.toString(response.getEntity(), "UTF-8"));
}
public static String getJOSNString()
{
JSONObject jsonobject = new JSONObject();
JSONObject jsonobject1 = new JSONObject();
JSONObject jsonobject2 = new JSONObject();
jsonobject2.put("name", "jingchenyong");
jsonobject1.put("match", jsonobject2);
jsonobject.put("query", jsonobject1);
String jsonstring = JSON.toJSONString(jsonobject);
return jsonstring;
}
}
