HttpClientUtil工具类

import org.apache.http.NameValuePair;
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.client.utils.URIBuilder;
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 java.io.IOException;
import java.net.URI;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;

public class HttpClientUtil {

/**
 * @Auther: [email protected]
 * @Description: 带参数GET请求
 * @Param: [url, param]
 * @Return: java.lang.String
 * @Create: 2018-9-21 9:03
 */
public static String doGet(String url, Map param) {
    // 创建Httpclient对象
    CloseableHttpClient httpclient = HttpClients.createDefault();

    String resultString = "";
    CloseableHttpResponse response = null;
    try {
        // 创建uri
        URIBuilder builder = new URIBuilder(url);
        if (param != null) {
            for (String key : param.keySet()) {
                builder.addParameter(key, param.get(key));
            }
        }
        URI uri = builder.build();

        // 创建http GET请求
        HttpGet httpGet = new HttpGet(uri);

        // 执行请求
        response = httpclient.execute(httpGet);
        // 判断返回状态是否为200
        if (response.getStatusLine().getStatusCode() == 200) {
            resultString = EntityUtils.toString(response.getEntity(), "UTF-8");
        }
    } catch (Exception e) {
        e.printStackTrace();
    } finally {
        try {
            if (response != null) {
                response.close();
            }
            httpclient.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    return resultString;
}

/**
 * @Auther: [email protected]
 * @Description: 带参数和请求头的GET请求
 * @Param: [url, param, header]
 * @Return: java.lang.String
 * @Create: 2018-9-25 20:09
 */
public static String doGet(String url, Map param, Map header) {
    // 创建Httpclient对象
    CloseableHttpClient httpclient = HttpClients.createDefault();

    String resultString = "";
    CloseableHttpResponse response = null;
    try {
        // 创建uri
        URIBuilder builder = new URIBuilder(url);
        if (param != null) {
            for (String key : param.keySet()) {
                builder.addParameter(key, param.get(key).toString());
            }
        }
        URI uri = builder.build();

        // 创建http GET请求
        HttpGet httpGet = new HttpGet(uri);

        if (header != null) {
            for (String key : header.keySet()) {
                httpGet.setHeader(key, header.get(key).toString());
            }
        }

        // 执行请求
        response = httpclient.execute(httpGet);
        // 判断返回状态是否为200
        if (response.getStatusLine().getStatusCode() == 200) {
            resultString = EntityUtils.toString(response.getEntity(), "UTF-8");
        }
    } catch (Exception e) {
        e.printStackTrace();
    } finally {
        try {
            if (response != null) {
                response.close();
            }
            httpclient.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    return resultString;
}

/**
 * @Auther: [email protected]
 * @Description: 无参GET请求
 * @Param: [url]
 * @Return: java.lang.String
 * @Create: 2018-9-21 9:05
 */
public static String doGet(String url) {
    return doGet(url, null);
}

/**
 * @Auther: [email protected]
 * @Description: application/x-www-form-urlencoded编码方式带参POST请求
 * @Param: [url, param]
 * @Return: java.lang.String
 * @Create: 2018-9-21 9:05
 */
public static String doPost(String url, Map param) {
    // 创建Httpclient对象
    CloseableHttpClient httpClient = HttpClients.createDefault();
    CloseableHttpResponse response = null;
    String resultString = "";
    try {
        // 创建Http Post请求
        HttpPost httpPost = new HttpPost(url);
        // 创建参数列表
        if (param != null) {
            List paramList = new ArrayList();
            for (String key : param.keySet()) {
                paramList.add(new BasicNameValuePair(key, param.get(key)));
            }
            // 模拟表单
            UrlEncodedFormEntity entity = new UrlEncodedFormEntity(paramList,"utf-8");
            httpPost.setEntity(entity);
        }
        // 执行http请求
        response = httpClient.execute(httpPost);
        resultString = EntityUtils.toString(response.getEntity(), "utf-8");
    } catch (Exception e) {
        e.printStackTrace();
    } finally {
        try {
            response.close();
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
    }

    return resultString;
}

/**
 * @Auther: [email protected]
 * @Description: application/x-www-form-urlencoded编码方式带参数和请求头的POST请求
 * @Param: [url, param, header]
 * @Return: java.lang.String
 * @Create: 2018-9-27 14:54
 */
public static String doPost(String url, Map param, Map header) {
    // 创建Httpclient对象
    CloseableHttpClient httpClient = HttpClients.createDefault();
    CloseableHttpResponse response = null;
    String resultString = "";
    try {
        // 创建Http Post请求
        HttpPost httpPost = new HttpPost(url);

        //添加请求头信息
        if (header != null) {
            for (String key : header.keySet()) {
                httpPost.setHeader(key, header.get(key).toString());
            }
        }
        // 创建参数列表
        if (param != null) {
            List paramList = new ArrayList();
            for (String key : param.keySet()) {
                paramList.add(new BasicNameValuePair(key, param.get(key)));
            }
            // 模拟表单
            UrlEncodedFormEntity entity = new UrlEncodedFormEntity(paramList,"utf-8");
            httpPost.setEntity(entity);
        }
        // 执行http请求
        response = httpClient.execute(httpPost);
        resultString = EntityUtils.toString(response.getEntity(), "utf-8");
    } catch (Exception e) {
        e.printStackTrace();
    } finally {
        try {
            response.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    return resultString;
}

/**
 * @Auther: [email protected]
 * @Description: application/x-www-form-urlencoded编码方式无参POST请求
 * @Param: [url]
 * @Return: java.lang.String
 * @Create: 2018-9-21 9:10
 */
public static String doPost(String url) {
    return doPost(url, null);
}

/**
 * @Auther: [email protected]
 * @Description: application/json编码方式POST请求
 * @Param: [url, json]
 * @Return: java.lang.String
 * @Create: 2018-9-21 9:11
 */
public static String doPostJson(String url, String json) {
    // 创建Httpclient对象
    CloseableHttpClient httpClient = HttpClients.createDefault();
    CloseableHttpResponse response = null;
    String resultString = "";
    try {
        // 创建Http Post请求
        HttpPost httpPost = new HttpPost(url);
        // 创建请求内容
        StringEntity entity = new StringEntity(json, ContentType.APPLICATION_JSON);
        httpPost.setEntity(entity);
        // 执行http请求
        response = httpClient.execute(httpPost);
        resultString = EntityUtils.toString(response.getEntity(), "utf-8");
    } catch (Exception e) {
        e.printStackTrace();
    } finally {
        try {
            response.close();
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
    }

    return resultString;
}

/**
 * @Auther: [email protected]
 * @Description: application/json编码方式带请求头POST请求
 * @Param: [url, json, header]
 * @Return: java.lang.String
 * @Create: 2018-9-27 15:19
 */
public static String doPostJson(String url, String json, Map header) {
    // 创建Httpclient对象
    CloseableHttpClient httpClient = HttpClients.createDefault();
    CloseableHttpResponse response = null;
    String resultString = "";
    try {
        // 创建Http Post请求
        HttpPost httpPost = new HttpPost(url);

        //添加请求头信息
        if (header != null) {
            for (String key : header.keySet()) {
                httpPost.setHeader(key, header.get(key).toString());
            }
        }

        // 创建请求内容
        StringEntity entity = new StringEntity(json, "utf-8");
        httpPost.setEntity(entity);
        // 执行http请求
        response = httpClient.execute(httpPost);
        resultString = EntityUtils.toString(response.getEntity(), "utf-8");
    } catch (Exception e) {
        e.printStackTrace();
    } finally {
        try {
            response.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    return resultString;
}

}

1.doGet
1）
String responseStr = HttpClientUtil.doGet(url,null); 等价于 String responseStr = HttpClientUtil.doGet(url);
2）
Map param=new HashMap<>();
param.put(“token” ,jsonObject.getString(“token”));
String responseStr = HttpClientUtil.doGet(url,Param);
3）
Map headerParam=new HashMap<>();
headerParam.put(“Authorization” , param.get(“token”).replaceAll("\r|\n", “”));
String responseStr = HttpClientUtil.doGet(url,null,headerParam);
2.同理doPost