Apache HttpClient工具类

1.测试：

package myHttpClient;
 
/**
 * Hello world!
 *
 */
public class myApp {
    public static void main(String[] args) throws Exception {
        String reString = HttpClientUtils.doGet("https://www.baidu.com/").getContent();
        System.out.print(reString);
    }
}

2.工具类：

package myHttpClient;
 
import java.io.IOException;
import java.io.UnsupportedEncodingException;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Map.Entry;
import java.util.Set;
 
import org.apache.http.HttpStatus;
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.CloseableHttpResponse;
import org.apache.http.client.methods.HttpDelete;
import org.apache.http.client.methods.HttpEntityEnclosingRequestBase;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.client.methods.HttpPut;
import org.apache.http.client.methods.HttpRequestBase;
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.message.BasicNameValuePair;
import org.apache.http.util.EntityUtils;
 
/**
 *  httpClient工具类
 */
public class HttpClientUtils {
 
    // 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;
    
    private static HttpClientResult httpClientResult;
 
    /**
     * 发送get请求；不带请求头和请求参数
     * 
     * @param url 请求地址
     * @return
     * @throws Exception
     */
    public static HttpClientResult doGet(String url) throws Exception {
        return doGet(url, null, null);
    }
    
    /**
     * 发送get请求；带请求参数
     * 
     * @param url 请求地址
     * @param params 请求参数集合
     * @return
     * @throws Exception
     */
    public static HttpClientResult doGet(String url, Map<String, String> params) throws Exception {
        return doGet(url, null, params);
    }
 
    /**
     * 发送get请求；带请求头和请求参数
     * 
     * @param url 请求地址
     * @param headers 请求头集合
     * @param params 请求参数集合
     * @return
     * @throws Exception
     */
    public static HttpClientResult doGet(String url, Map<String, String> headers, Map<String, String> params) throws Exception {
        // 创建httpClient对象
        CloseableHttpClient httpClient = HttpClients.createDefault();
 
        // 创建访问的地址
        URIBuilder uriBuilder = new URIBuilder(url);
        if (params != null) {
            Set<Entry<String, String>> entrySet = params.entrySet();
            for (Entry<String, String> entry : entrySet) {
                uriBuilder.setParameter(entry.getKey(), entry.getValue());
            }
        }
 
        // 创建http对象
        HttpGet httpGet = new HttpGet(uriBuilder.build());
        /**
         * setConnectTimeout：设置连接超时时间，单位毫秒。
         * setConnectionRequestTimeout：设置从connect Manager(连接池)获取Connection
         * 超时时间，单位毫秒。这个属性是新加的属性，因为目前版本是可以共享连接池的。
         * setSocketTimeout：请求获取数据的超时时间(即响应时间)，单位毫秒。 如果访问一个接口，多少时间内无法返回数据，就直接放弃此次调用。
         */
        RequestConfig requestConfig = RequestConfig.custom().setConnectTimeout(CONNECT_TIMEOUT).setSocketTimeout(SOCKET_TIMEOUT).build();
        httpGet.setConfig(requestConfig);
        
        // 设置请求头
        packageHeader(headers, httpGet);
 
        // 创建httpResponse对象
        CloseableHttpResponse httpResponse = null;
 
        try {
            // 执行请求并获得响应结果
            return getHttpClientResult(httpResponse, httpClient, httpGet);
        } finally {
            // 释放资源
            release(httpResponse, httpClient);
        }
    }
 
    /**
     * 发送post请求；不带请求头和请求参数
     * 
     * @param url 请求地址
     * @return
     * @throws Exception
     */
    public static HttpClientResult doPost(String url) throws Exception {
        return doPost(url, null, null);
    }
    
    /**
     * 发送post请求；带请求参数
     * 
     * @param url 请求地址
     * @param params 参数集合
     * @return
     * @throws Exception
     */
    public static HttpClientResult doPost(String url, Map<String, String> params) throws Exception {
        return doPost(url, null, params);
    }
 
    /**
     * 发送post请求；带请求头和请求参数
     * 
     * @param url 请求地址
     * @param headers 请求头集合
     * @param params 请求参数集合
     * @return
     * @throws Exception
     */
    public static HttpClientResult doPost(String url, Map<String, String> headers, Map<String, String> params) throws Exception {
        // 创建httpClient对象
        CloseableHttpClient httpClient = HttpClients.createDefault();
 
        // 创建http对象
        HttpPost httpPost = new HttpPost(url);
        /**
         * setConnectTimeout：设置连接超时时间，单位毫秒。
         * setConnectionRequestTimeout：设置从connect Manager(连接池)获取Connection
         * 超时时间，单位毫秒。这个属性是新加的属性，因为目前版本是可以共享连接池的。
         * setSocketTimeout：请求获取数据的超时时间(即响应时间)，单位毫秒。 如果访问一个接口，多少时间内无法返回数据，就直接放弃此次调用。
         */
        RequestConfig requestConfig = RequestConfig.custom().setConnectTimeout(CONNECT_TIMEOUT).setSocketTimeout(SOCKET_TIMEOUT).build();
        httpPost.setConfig(requestConfig);
        // 设置请求头
        /*httpPost.setHeader("Cookie", "");
        httpPost.setHeader("Connection", "keep-alive");
        httpPost.setHeader("Accept", "application/json");
        httpPost.setHeader("Accept-Language", "zh-CN,zh;q=0.9");
        httpPost.setHeader("Accept-Encoding", "gzip, deflate, br");
        httpPost.setHeader("User-Agent", "Mozilla/5.0 (Windows NT 10.0; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/65.0.3325.181 Safari/537.36");*/
        packageHeader(headers, httpPost);
        
        // 封装请求参数
        packageParam(params, httpPost);
 
        // 创建httpResponse对象
        CloseableHttpResponse httpResponse = null;
 
        try {
            // 执行请求并获得响应结果
            return getHttpClientResult(httpResponse, httpClient, httpPost);
        } finally {
            // 释放资源
            release(httpResponse, httpClient);
        }
    }
 
    /**
     * 发送put请求；不带请求参数
     * 
     * @param url 请求地址
     * @param params 参数集合
     * @return
     * @throws Exception
     */
    public static HttpClientResult doPut(String url) throws Exception {
        return doPut(url);
    }
 
    /**
     * 发送put请求；带请求参数
     * 
     * @param url 请求地址
     * @param params 参数集合
     * @return
     * @throws Exception
     */
    public static HttpClientResult doPut(String url, Map<String, String> params) throws Exception {
        CloseableHttpClient httpClient = HttpClients.createDefault();
        HttpPut httpPut = new HttpPut(url);
        RequestConfig requestConfig = RequestConfig.custom().setConnectTimeout(CONNECT_TIMEOUT).setSocketTimeout(SOCKET_TIMEOUT).build();
        httpPut.setConfig(requestConfig);
        
        packageParam(params, httpPut);
 
        CloseableHttpResponse httpResponse = null;
 
        try {
            return getHttpClientResult(httpResponse, httpClient, httpPut);
        } finally {
            release(httpResponse, httpClient);
        }
    }
 
    /**
     * 发送delete请求；不带请求参数
     * 
     * @param url 请求地址
     * @param params 参数集合
     * @return
     * @throws Exception
     */
    public static HttpClientResult doDelete(String url) throws Exception {
        CloseableHttpClient httpClient = HttpClients.createDefault();
        HttpDelete httpDelete = new HttpDelete(url);
        RequestConfig requestConfig = RequestConfig.custom().setConnectTimeout(CONNECT_TIMEOUT).setSocketTimeout(SOCKET_TIMEOUT).build();
        httpDelete.setConfig(requestConfig);
 
        CloseableHttpResponse httpResponse = null;
        try {
            return getHttpClientResult(httpResponse, httpClient, httpDelete);
        } finally {
            release(httpResponse, httpClient);
        }
    }
 
    /**
     * 发送delete请求；带请求参数
     * 
     * @param url 请求地址
     * @param params 参数集合
     * @return
     * @throws Exception
     */
    public static HttpClientResult doDelete(String url, Map<String, String> params) throws Exception {
        if (params == null) {
            params = new HashMap<String, String>();
        }
 
        params.put("_method", "delete");
        return doPost(url, params);
    }
    
    /**
     * Description: 封装请求头
     * @param params
     * @param httpMethod
     */
    public static void packageHeader(Map<String, String> params, HttpRequestBase httpMethod) {
        // 封装请求头
        if (params != null) {
            Set<Entry<String, String>> entrySet = params.entrySet();
            for (Entry<String, String> entry : entrySet) {
                // 设置到请求头到HttpRequestBase对象中
                httpMethod.setHeader(entry.getKey(), entry.getValue());
            }
        }
    }
 
    /**
     * Description: 封装请求参数
     * 
     * @param params
     * @param httpMethod
     * @throws UnsupportedEncodingException
     */
    public static void packageParam(Map<String, String> params, HttpEntityEnclosingRequestBase httpMethod)
            throws UnsupportedEncodingException {
        // 封装请求参数
        if (params != null) {
            List<NameValuePair> nvps = new ArrayList<NameValuePair>();
            Set<Entry<String, String>> entrySet = params.entrySet();
            for (Entry<String, String> entry : entrySet) {
                nvps.add(new BasicNameValuePair(entry.getKey(), entry.getValue()));
            }
 
            // 设置到请求的http对象中
            httpMethod.setEntity(new UrlEncodedFormEntity(nvps, ENCODING));
        }
    }
 
    /**
     * Description: 获得响应结果
     * 
     * @param httpResponse
     * @param httpClient
     * @param httpMethod
     * @return
     * @throws Exception
     */
    public static HttpClientResult getHttpClientResult(CloseableHttpResponse httpResponse,
            CloseableHttpClient httpClient, HttpRequestBase httpMethod) throws Exception {
        if (httpClientResult == null) {
            httpClientResult = new HttpClientResult();
        }
        // 执行请求
        httpResponse = httpClient.execute(httpMethod);
 
        // 获取返回结果
        if (httpResponse != null && httpResponse.getStatusLine() != null) {
            String content = "";
            if (httpResponse.getEntity() != null) {
                content = EntityUtils.toString(httpResponse.getEntity(), ENCODING);
 
            }
            httpClientResult.setCode(200);
            httpClientResult.setContent(content);
            return httpClientResult;
        }
        return new HttpClientResult();
    }
 
    /**
     * Description: 释放资源
     * 
     * @param httpResponse
     * @param httpClient
     * @throws IOException
     */
    public static void release(CloseableHttpResponse httpResponse, CloseableHttpClient httpClient) throws IOException {
        // 释放资源
        if (httpResponse != null) {
            httpResponse.close();
        }
        if (httpClient != null) {
            httpClient.close();
        }
    }
 
}

3.响应结果：

package myHttpClient;
 
import java.io.Serializable;
 
/**
 * Description: 封装httpClient响应结果
 * 
 */
public class HttpClientResult implements Serializable {
 
    /**
     * 响应状态码
     */
    private int code;
 
    /**
     * 响应数据
     */
    private String content;
 
    public int getCode() {
        return code;
    }
 
    public void setCode(int code) {
        this.code = code;
    }
 
    public String getContent() {
        return content;
    }
 
    public void setContent(String content) {
        this.content = content;
    }
 
}

其他示例：

package com.resafety.hefioc.util;

import org.apache.http.HttpEntity;
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.impl.client.CloseableHttpClient;
import org.apache.http.impl.client.HttpClients;
import org.apache.http.util.EntityUtils;

public class PortUtil {
    private RequestConfig requestConfig = RequestConfig.custom().setSocketTimeout(15000).setConnectTimeout(15000)
            .setConnectionRequestTimeout(15000).build();
    
    public String sendHttpGet(String httpUrl,String clientId,String loginCode,String loginPassword) {    
        HttpGet httpGet = new HttpGet(httpUrl);
        return sendHttpGet(httpGet,clientId,loginCode,loginPassword);
    }
    
    public String sendHttpGet(HttpGet httpGet,String clientId,String loginCode,String loginPassword) {
        CloseableHttpClient httpClient = null;
        CloseableHttpResponse response = null;
        HttpEntity entity = null;
        String responseContent = null;
        try {
            // 创建默认的httpClient实例
            httpClient = HttpClients.createDefault();
            httpGet.setConfig(requestConfig);
            httpGet.addHeader("ClientId", clientId);
            httpGet.addHeader("LoginCode", loginCode);
            httpGet.addHeader("LoginPassword", loginPassword);
            // 执行请求
            response = httpClient.execute(httpGet);
            entity = response.getEntity();
            responseContent = EntityUtils.toString(entity, "UTF-8");
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            try {
                if (response != null) {
                    response.close();
                }
                if (httpClient != null) {
                    httpClient.close();
                }
            } catch (Exception e2) {
                e2.printStackTrace();
            }
        }
        return responseContent;
    }
}