HttpClient请求工具类

最新推荐文章于 2023-11-27 11:48:59 发布

原创最新推荐文章于 2023-11-27 11:48:59 发布 · 304 阅读

0 ·

CC 4.0 BY-SA版权

xiaojie

文章标签：

#java

笔记专栏收录该内容

23 篇文章

订阅专栏

该博客介绍了如何使用Apache HttpClient进行HTTP请求的封装，包括GET和POST方法的实现，以及参数和头部信息的处理。内容涵盖HttpClientUtil工具类的详细方法，如httpGetRequest和httpPostRequest，用于执行HTTP请求并获取响应结果。

依赖

<dependency>
	<groupId>org.apache.httpcomponents</groupId>
	<artifactId>httpclient</artifactId>
	<version>4.5.6</version>
</dependency>

下面为工具类


import java.io.*;
import java.net.*;
import java.util.ArrayList;
import java.util.Map;


import org.apache.http.HttpEntity;
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.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.impl.conn.PoolingHttpClientConnectionManager;
import org.apache.http.message.BasicNameValuePair;
import org.apache.http.util.EntityUtils;

/**
 * @author 阿杰
 * @effect http请求封装类
 * @date 2022/2/25
 * @versions 1.0
 */
public class HttpClientUtil {
    private static PoolingHttpClientConnectionManager cm;
    private static String EMPTY_STR = "";
    private static String UTF_8 = "UTF-8";

    private static void init() {
        if (cm == null) {
            cm = new PoolingHttpClientConnectionManager();
            cm.setMaxTotal(50);
            cm.setDefaultMaxPerRoute(5);
        }
    }

    /**
     * 初始化ttpClient
     * 
     * @return
     */
    private static CloseableHttpClient getHttpClient() {
        init();
        return HttpClients.custom().setConnectionManager(cm).build();
    }

    /**
     * 
     * @param url
     * @return
     */
    public static String httpGetRequest(String url) {
        HttpGet httpGet = new HttpGet(url);
        return getResult(httpGet);
    }

    public static String httpGetRequest(String url, Map<String, String> params) throws URISyntaxException, UnsupportedEncodingException {
        URIBuilder ub = new URIBuilder();
        ub.setPath(url);

        ArrayList<NameValuePair> pairs = covertParams2NVPS(params);
        ub.setParameters(pairs);

        HttpGet httpGet = new HttpGet(ub.build());
        return getResult(httpGet);
    }

    public static String httpGetRequest(String url, Map<String, Object> headers, Map<String, String> params)
            throws URISyntaxException, UnsupportedEncodingException {
        URIBuilder ub = new URIBuilder();
        ub.setPath(url);

        ArrayList<NameValuePair> pairs = covertParams2NVPS(params);
        ub.setParameters(pairs);

        HttpGet httpGet = new HttpGet(ub.build());
        for (Map.Entry<String, Object> param : headers.entrySet()) {
            httpGet.addHeader(param.getKey(), String.valueOf(param.getValue()));
        }
        return getResult(httpGet);
    }

    public static String httpPostRequest(String url) {
        HttpPost httpPost = new HttpPost(url);
        return getResult(httpPost);
    }

    /**
     * post请求
     * @param url  请求的地址
     * @param params  参数
     * @return
     * @throws UnsupportedEncodingException
     */
    public static String httpPostRequest(String url, Map<String, String> params) throws UnsupportedEncodingException {
        HttpPost httpPost = new HttpPost(url);
        ArrayList<NameValuePair> pairs = covertParams2NVPS(params);
        httpPost.setEntity(new UrlEncodedFormEntity(pairs, UTF_8));
        return getResult(httpPost);
    }


    /**
     * post请求
     * @param url  请求的地址
     * @param headers  头部信息
     * @param params  参数
     * @return
     * @throws UnsupportedEncodingException
     */
    public static String httpPostRequest(String url, Map<String, Object> headers, Map<String, String> params)
            throws UnsupportedEncodingException {
        HttpPost httpPost = new HttpPost(url);

        for (Map.Entry<String, Object> param : headers.entrySet()) {
            httpPost.addHeader(param.getKey(), String.valueOf(param.getValue()));
        }

        ArrayList<NameValuePair> pairs = covertParams2NVPS(params);
        httpPost.setEntity(new UrlEncodedFormEntity(pairs, UTF_8));

        return getResult(httpPost);
    }

    /**
     * 封装参数
     * @param params
     * @return
     * @throws UnsupportedEncodingException
     */
    private static ArrayList<NameValuePair> covertParams2NVPS(Map<String, String> params) throws UnsupportedEncodingException {
        ArrayList<NameValuePair> pairs = new ArrayList<NameValuePair>();
        for (Map.Entry<String, String> param : params.entrySet()) {
        	if( param.getValue().indexOf('&')!=-1||
        		param.getValue().indexOf('+')!=-1||
        		param.getValue().indexOf('/')!=-1||
        		param.getValue().indexOf('?')!=-1||
        		param.getValue().indexOf('%')!=-1||
        		param.getValue().indexOf('#')!=-1
        	){
                pairs.add(new BasicNameValuePair(param.getKey(), URLEncoder.encode(URLEncoder.encode(String.valueOf(param.getValue()),"UTF-8"),"UTF-8")));
        	}
        	else{
        		pairs.add(new BasicNameValuePair(param.getKey(), String.valueOf(param.getValue())));
        	}
        }

        return pairs;
    }

    /**
     * 请求
     * @param request
     * @return
     */
    private static String getResult(HttpRequestBase request) {
        // CloseableHttpClient httpClient = HttpClients.createDefault();
        CloseableHttpClient httpClient = getHttpClient();
        try {
            CloseableHttpResponse response = httpClient.execute(request);
            HttpEntity entity = response.getEntity();
            if (entity != null) {
                String result = EntityUtils.toString(entity);
                response.close();
                return result;
            }
        } catch (ClientProtocolException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        } finally {

        }
        return EMPTY_STR;
    }
}