示例http client代码 MyHttpUtils.java 最后更新时间: 2023年08月30日

对应的httpclient版本为 4.5.11。

本代码仅做示例用，不建议在正式的生产环境中使用。

package com.amap.wia.openapi.test.lib;

import org.apache.http.HttpEntity;
import org.apache.http.NameValuePair;
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;

import java.io.IOException;
import java.net.URLEncoder;
import java.nio.charset.StandardCharsets;
import java.util.List;
import java.util.Map;

public class MyHttpUtils {
    private static boolean isDebugLogOpen = true;

    public static String get(String url) {
        HttpGet httpget = new HttpGet(url);
        log("get() with url:" + url);
        return doRequest(httpget);
    }

    protected static void println(String s) {
        System.out.println(s);
    }

    public static void log(String msg) {
        if (isDebugLogOpen) {
            println(msg);
        }
    }

    public static String attachParamsToUrl(String url, Map<String, Object> param) {
        String paramString = "";
        if (param == null || param.size() == 0) {
            return url;
        }
        for (Map.Entry<String, Object> entry : param.entrySet()) {
            String tmp = urlencode(entry.getKey()) + "=" + urlencode(entry.getValue().toString()) + "&";
            paramString += tmp;
        }
        if (url.contains("?")) {
            url = url + "&" + paramString;
        } else {
            url = url + "?" + paramString;
        }
        return url;

    }

    public static String urlencode(String value) {
        try {
            return URLEncoder.encode(value, "UTF-8");
        } catch (Exception e) {
            e.printStackTrace();
        }
        return "";
    }

    public static String postFormUrlencoded(String httpUrl, Map<String, Object> params) {
        log("postFormUrlencoded() with url:" + httpUrl);
        log("post arguments:" + params);
        HttpPost request = new HttpPost(httpUrl);
        List<NameValuePair> list = new ArrayList<NameValuePair>();
        if (params != null) {
            for (Map.Entry<String, Object> item : params.entrySet()) {
                list.add(new BasicNameValuePair(item.getKey(), item.getValue().toString()));
            }
        }
        UrlEncodedFormEntity formEntity = new UrlEncodedFormEntity(list, StandardCharsets.UTF_8);
        request.setEntity(formEntity);
        return doRequest(request);
    }

    public static String postApplicationJson(String httpUrl, String jsonString) {
        log("postApplicationJson() with url:" + httpUrl);
        log("post json string:" + jsonString);
        HttpPost request = new HttpPost(httpUrl);
        StringEntity entity = new StringEntity(jsonString, StandardCharsets.UTF_8);
        entity.setContentType("application/json");
        entity.setContentEncoding(StandardCharsets.UTF_8.toString());
        request.setEntity(entity);
        return doRequest(request);
    }

    protected static String doRequest(HttpRequestBase request) {
        String result = "";
        try (CloseableHttpClient httpClient = HttpClientBuilder.create().build()) {
            try (CloseableHttpResponse response = httpClient.execute(request)) {
                String printResult = "";
                HttpEntity responseEntity = response.getEntity();
                if (responseEntity != null) {
                    result = EntityUtils.toString(responseEntity, StandardCharsets.UTF_8);
                    printResult = "response result:" + result;
                } else {
                    printResult = "response empty result!";
                }
                log(printResult);
            }
        } catch (IOException e) {
            e.printStackTrace();
        }
        return result;
    }
}