HttpClientUtil工具类

依赖

<dependency>
<groupId>org.apache.httpcomponents</groupId>
<artifactId>httpclient</artifactId>
<version>4.5.11</version>
</dependency>

package com.example.http;

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

import org.apache.http.HttpEntity;
import org.apache.http.NameValuePair;
import org.apache.http.client.config.RequestConfig;
import org.apache.http.client.entity.UrlEncodedFormEntity;
import org.apache.http.client.methods.*;
import org.apache.http.entity.StringEntity;
import org.apache.http.impl.client.CloseableHttpClient;
import org.apache.http.impl.client.HttpClientBuilder;
import org.apache.http.message.BasicNameValuePair;
import org.apache.http.util.EntityUtils;

public class HttpClientUtil {
// 编码格式。发送编码格式统一用UTF-8
private static final String ENCODING = "UTF-8";

// 设置连接超时时间，单位毫秒。
private static final int CONNECT_TIMEOUT = 5000;

// 请求获取数据的超时时间(即响应时间)，单位毫秒。
private static final int SOCKET_TIMEOUT = 5000;

/**
* Description: get请求
*
* @param url 路径
* @return 响应结果
*/
public static String get(String url) throws Exception {
return get(url, null);
}

/**
* Description: post请求
*
* @param url    路径
* @param params 参数
* @return 响应结果
*/
public static String post(String url, Map<String, Object> params) throws Exception {
return post(url, params, null);
}

/**
* Description: post请求（用于请求json格式的参数）
*
* @param url    路径
* @param params json参数
* @return 响应结果
*/
public static String jsonPost(String url, String params) throws Exception {
return jsonPost(url, params, null);
}

/**
* Description: get请求
*
* @param url     路径
* @param headers 请求头信息
* @return 响应结果
*/
public static String get(String url, Map<String, String> headers) throws Exception {
CloseableHttpClient httpClient = null;
HttpGet httpGet;
CloseableHttpResponse httpResponse = null;
String result;
try {
httpClient = HttpClientBuilder.create().build();

httpGet = new HttpGet(url);
//设置请求头
setHeader(headers, httpGet);
RequestConfig config = RequestConfig.custom().setConnectTimeout(CONNECT_TIMEOUT).setSocketTimeout(SOCKET_TIMEOUT).build();
httpGet.setConfig(config);
result = getHttpClientResult(httpResponse, httpClient, httpGet);
} finally {
release(httpResponse, httpClient);
}
return result;
}

/**
* Description: post请求
*
* @param url     路径
* @param params  参数
* @param headers 请求头信息
* @return 响应结果
*/
public static String post(String url, Map<String, Object> params, Map<String, String> headers) throws Exception {
CloseableHttpClient httpClient = null;
HttpPost httpPost;
CloseableHttpResponse httpResponse = null;
String result;
try {
httpClient = HttpClientBuilder.create().build();
httpPost = new HttpPost(url);
//设置请求头
setHeader(headers, httpPost);
//设置参数
setParam(params, httpPost);

RequestConfig config = RequestConfig.custom().setConnectTimeout(CONNECT_TIMEOUT).setSocketTimeout(SOCKET_TIMEOUT).build();
httpPost.setConfig(config);

result = getHttpClientResult(httpResponse, httpClient, httpPost);
} finally {
release(httpResponse, httpClient);
}
return result;
}

/**
* Description: post请求（用于请求json格式的参数）
*
* @param url     路径
* @param params  json参数
* @param headers 请求头信息
* @return 响应结果
*/
public static String jsonPost(String url, String params, Map<String, String> headers) throws Exception {
CloseableHttpClient httpClient = null;
HttpPost httpPost;
CloseableHttpResponse httpResponse = null;
String result;
try {
httpClient = HttpClientBuilder.create().build();
httpPost = new HttpPost(url);
httpPost.addHeader("Content-type", "application/json; charset=utf-8");
httpPost.setHeader("Accept", "application/json");
//设置请求头
setHeader(headers, httpPost);
//设置参数
httpPost.setEntity(new StringEntity(params, ENCODING));
RequestConfig config = RequestConfig.custom().setConnectTimeout(CONNECT_TIMEOUT).setSocketTimeout(SOCKET_TIMEOUT).build();
httpPost.setConfig(config);

result = getHttpClientResult(httpResponse, httpClient, httpPost);
} finally {
release(httpResponse, httpClient);
}
return result;
}

/**
* Description: 封装请求头
*
* @param headers    请求头
* @param httpMethod httpMethod
*/
public static void setHeader(Map<String, String> headers, HttpRequestBase httpMethod) {
// 封装请求头
if (headers != null) {
for (Entry<String, String> entry : headers.entrySet()) {
httpMethod.addHeader(entry.getKey(), entry.getValue());
}
}
}

/**
* Description: 封装请求参数
*
* @param params     请求参数
* @param httpMethod httpMethod
*/
public static void setParam(Map<String, Object> params, HttpEntityEnclosingRequestBase httpMethod) throws UnsupportedEncodingException {

List<NameValuePair> list = new ArrayList<>();
if (null != params) {
for (Entry<String, Object> entry : params.entrySet()) {
String key = entry.getKey();
String value = entry.getValue() != null ? entry.getValue().toString() : "";
list.add(new BasicNameValuePair(key, value));
}
}
if (list.size() > 0) {
UrlEncodedFormEntity entity = new UrlEncodedFormEntity(list, ENCODING);
httpMethod.setEntity(entity);
}
}

/**
* Description: 获取响应结果
*
* @param httpResponse httpResponse
* @param httpClient   httpClient
* @param httpMethod   httpMethod
* @return 响应结果
* @throws Exception Exception
*/
public static String getHttpClientResult(CloseableHttpResponse httpResponse, CloseableHttpClient httpClient, HttpRequestBase httpMethod) throws Exception {
String result = null;
// 执行请求
httpResponse = httpClient.execute(httpMethod);

// 获取返回结果
if (httpResponse != null) {
HttpEntity resEntity = httpResponse.getEntity();
if (resEntity != null) {
result = EntityUtils.toString(resEntity, ENCODING);
}
}
return result;
}

/**
* Description: 释放资源
*
* @param httpResponse HttpResponse
* @param httpClient   HttpClient
* @throws IOException IOException
*/
public static void release(CloseableHttpResponse httpResponse, CloseableHttpClient httpClient) throws IOException {
if (httpResponse != null) {
httpResponse.close();
}
if (httpClient != null) {
httpClient.close();
}
}
}

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