HttpClient-优快云博客

本文链接：https://blog.youkuaiyun.com/zhangjunli/article/details/86236063

本文详细介绍了一个HTTP客户端的实现，包括POST请求传输map和json数据的方法，以及GET请求的处理。文章提供了具体的Java代码示例，展示了如何使用Apache HttpClient库进行网络请求，涵盖了参数设置、头部信息配置及响应处理等关键步骤。

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package com.hengyunsoft.ucm.ssoclient.plugin.http;

import java.io.IOException;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Map.Entry;

import org.apache.http.HttpStatus;
import org.apache.http.NameValuePair;
import org.apache.http.client.ClientProtocolException;
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.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;

import com.alibaba.fastjson.JSON;

/**
* http客户端
*
* @author joyray
* @date 2019年1月3日下午5:55:43
*/
public class HttpClient {

/**
* post请求传输map数据
*
* @param url
* @param map
* @param encoding
* @return
* @throws ClientProtocolException
* @throws IOException
*/
public static String sendPostDataByMap(String url, Map<String, String> map, String encoding) throws ClientProtocolException, IOException {
String result = "";

// 创建httpclient对象
CloseableHttpClient httpClient = HttpClients.createDefault();
// 创建post方式请求对象
HttpPost httpPost = new HttpPost(url);

// 装填参数
List<NameValuePair> nameValuePairs = new ArrayList<NameValuePair>();
if (map != null) {
for (Entry<String, String> entry : map.entrySet()) {
nameValuePairs.add(new BasicNameValuePair(entry.getKey(), entry.getValue()));
}
}

// 设置参数到请求对象中
httpPost.setEntity(new UrlEncodedFormEntity(nameValuePairs, encoding));

// 设置header信息
// 指定报文头【Content-type】、【User-Agent】
httpPost.setHeader("Content-type", "application/x-www-form-urlencoded");
httpPost.setHeader("User-Agent", "Mozilla/4.0 (compatible; MSIE 5.0; Windows NT; DigExt)");

// 执行请求操作，并拿到结果（同步阻塞）
CloseableHttpResponse response = httpClient.execute(httpPost);
// 获取结果实体
// 判断网络连接状态码是否正常(0--200都数正常)
if (response.getStatusLine().getStatusCode() == HttpStatus.SC_OK) {
result = EntityUtils.toString(response.getEntity(), "utf-8");
}
// 释放链接
response.close();

return result;
}

/**
* post请求传输json数据
*
* @param url
* @param json
* @param encoding
* @return
* @throws ClientProtocolException
* @throws IOException
*/
public static String sendPostDataByJson(String url, String json, String encoding) throws ClientProtocolException, IOException {
String result = "";

// 创建httpclient对象
CloseableHttpClient httpClient = HttpClients.createDefault();

// 创建post方式请求对象
HttpPost httpPost = new HttpPost(url);

// 设置参数到请求对象中
StringEntity stringEntity = new StringEntity(json, ContentType.APPLICATION_JSON);
stringEntity.setContentEncoding("utf-8");
httpPost.setEntity(stringEntity);

// 执行请求操作，并拿到结果（同步阻塞）
CloseableHttpResponse response = httpClient.execute(httpPost);

// 获取结果实体
// 判断网络连接状态码是否正常(0--200都数正常)
if (response.getStatusLine().getStatusCode() == HttpStatus.SC_OK) {
result = EntityUtils.toString(response.getEntity(), "utf-8");
}
// 释放链接
response.close();

return result;
}

/**
* get请求传输数据
*
* @param url
* @param encoding
* @return
* @throws ClientProtocolException
* @throws IOException
*/
public String sendGetData(String url, String encoding ) throws ClientProtocolException, IOException {
String result = "";

// 创建httpclient对象
CloseableHttpClient httpClient = HttpClients.createDefault();

// 创建get方式请求对象
HttpGet httpGet = new HttpGet(url);
httpGet.addHeader("Content-type", "application/json");

// 通过请求对象获取响应对象
CloseableHttpResponse response = httpClient.execute(httpGet);

return result;
}

@Test
public void testSendPostDataByMap() throws ClientProtocolException, IOException {
String url = "http://localhost:8080/httpService/sendPostDataByMap";
Map<String, String> map = new HashMap<String, String>();
map.put("name", "wyj");
map.put("city", "南京");
String body = sendPostDataByMap(url, map, "utf-8");
System.out.println("响应结果：" + body);
}

@Test
public void testSendPostDataByJson() throws ClientProtocolException, IOException {
String url = "http://localhost:8080/httpService/sendPostDataByJson";
Map<String, String> map = new HashMap<String, String>();
map.put("name", "wyj");
map.put("city", "南京");
String body = sendPostDataByJson(url, JSON.toJSONString(map), "utf-8");
System.out.println("响应结果：" + body);
}

@Test
public void testSendGetData() throws ClientProtocolException, IOException {
String url = "http://localhost:8080/httpService/sendGetData?name=wyj&city=南京";
String body = sendGetData(url, "utf-8");
System.out.println("响应结果：" + body);
}

}