HttpClient方式模拟http请求

方式一：HttpClient

import org.apache.commons.lang.exception.ExceptionUtils;
import org.apache.http.*;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.HttpClient;
import org.apache.http.client.entity.UrlEncodedFormEntity;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.message.BasicNameValuePair;
import org.apache.http.util.EntityUtils;
import org.apache.log4j.Logger;

import java.io.*;
import java.util.*;

/**
 * Created by Chen Hongyu on 2016/5/17.
 */
public class HttpTookit {
    private static Logger LOGGER = Logger.getLogger(HttpTookit.class);

    /**
     * @param args
     * @throws IOException
     * @throws ClientProtocolException
     */
    public static void main(String[] args) throws ClientProtocolException, IOException {

        String urlPost = "http://localhost:8080/collectDataPost.do";
        String urlGet = "http://localhost:8080/collectDataGet.do?name=张三";
        
        Map<String, object> params = new HashMap<>();
        params.put("name", "jerry");
        params.put("age", "18");
        params.put("sex", "man");
        String respon = doPost(urlPost, params);
        System.out.println("================发送请求：" + params);
        System.out.println("================回掉结果：" + respon);
        
    }

    public static void doGet(String url) {
        try {
            // 创建HttpClient实例
            HttpClient httpclient = new DefaultHttpClient();
            // 创建Get方法实例
            HttpGet httpgets = new HttpGet(url);
            HttpResponse response = httpclient.execute(httpgets);
            HttpEntity entity = response.getEntity();
            if (entity != null) {
                InputStream instreams = entity.getContent();
                String str = convertStreamToString(instreams);
                System.out.println("Do something");
                System.out.println(str);
                // Do not need the rest
                httpgets.abort();
            }
        } catch (Exception e) {

        }
    }

    public static String convertStreamToString(InputStream is) {
        BufferedReader reader = new BufferedReader(new InputStreamReader(is));
        StringBuilder sb = new StringBuilder();

        String line = null;
        try {
            while ((line = reader.readLine()) != null) {
                sb.append(line + "
");
            }
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            try {
                is.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
        return sb.toString();
    }

    public static String doPost(String url, Map<String, String> map) {

        HttpClient httpClient = new DefaultHttpClient();
        HttpPost method = new HttpPost(url);
        method.setHeader("accept",
            "text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8");

        int status = 0;
        String body = null;

        if (method != null & map != null) {
            try {
                //建立一个NameValuePair数组，用于存储欲传送的参数
                List<NameValuePair> params = new ArrayList<NameValuePair>();
                for (Map.Entry<String, String> entry : map.entrySet()) {
                    params.add(new BasicNameValuePair(entry.getKey(), entry.getValue()));
                }
                //添加参数
                method.setEntity(new UrlEncodedFormEntity(params));

                long startTime = System.currentTimeMillis();

                HttpResponse response = httpClient.execute(method);

                System.out.println("the http method is:" + method.getEntity());
                long endTime = System.currentTimeMillis();
                int statusCode = response.getStatusLine().getStatusCode();
                LOGGER.info("状态码:" + statusCode);
                LOGGER.info("调用API 花费时间(单位：毫秒)：" + (endTime - startTime));
                if (statusCode != HttpStatus.SC_OK) {
                    LOGGER.error("请求失败:" + response.getStatusLine());
                    status = 1;
                }

                //Read the response body
                body = EntityUtils.toString(response.getEntity(), "UTF-8");

            } catch (IOException e) {
                //发生网络异常
                LOGGER.error("exception occurred!
" + ExceptionUtils.getFullStackTrace(e));
                //网络错误
                status = 3;
            } finally {
                LOGGER.info("调用接口状态：" + status);
            }

        }
        return body;
    }

}

方式二：HttpURLConnection

import java.io.*;
import java.net.HttpURLConnection;
import java.net.ProtocolException;
import java.net.URL;
import java.net.URLEncoder;
import java.util.HashMap;
import java.util.Map;

/**
 * HTTP工具
 * Created by Chen Hongyu on 2016/5/18.
 */
public class HttpUtil {
    /**
     * 请求类型： GET
     */
    public final static String GET  = "GET";
    /**
     * 请求类型： POST
     */
    public final static String POST = "POST";

    /**
     * HttpURLConnection方式 模拟Http Get请求
     * @param urlStr
     *             请求路径
     * @param paramMap
     *             请求参数
     * @return
     * @throws Exception
     */
    public static String get(String urlStr, Map<String, String> paramMap) throws Exception {
        urlStr = urlStr + "?" + getParamString(paramMap);
        HttpURLConnection conn = null;
        try {
            //创建URL对象
            URL url = new URL(urlStr);
            //获取URL连接
            conn = (HttpURLConnection) url.openConnection();
            //设置通用的请求属性
            setHttpUrlConnection(conn, GET);
            //建立实际的连接
            conn.connect();
            //获取响应的内容
            return readResponseContent(conn.getInputStream());
        } finally {
            if (null != conn)
                conn.disconnect();
        }
    }

    /**
     * HttpURLConnection方式 模拟Http Post请求
     * @param urlStr
     *             请求路径
     * @param paramMap
     *             请求参数
     * @return
     * @throws Exception
     */
    public static String post(String urlStr, Map<String, String> paramMap) throws Exception {
        HttpURLConnection conn = null;
        PrintWriter writer = null;
        try {
            //创建URL对象
            URL url = new URL(urlStr);
            //获取请求参数
            String param = getParamString(paramMap);
            //获取URL连接
            conn = (HttpURLConnection) url.openConnection();
            //设置通用请求属性
            setHttpUrlConnection(conn, POST);
            //建立实际的连接
            conn.connect();
            //将请求参数写入请求字符流中
            writer = new PrintWriter(conn.getOutputStream());
            writer.print(param);
            writer.flush();
            //读取响应的内容
            return readResponseContent(conn.getInputStream());
        } finally {
            if (null != conn)
                conn.disconnect();
            if (null != writer)
                writer.close();
        }
    }

    /**
     * 读取响应字节流并将之转为字符串
     * @param in
     *         要读取的字节流
     * @return
     * @throws IOException
     */
    private static String readResponseContent(InputStream in) throws IOException {
        Reader reader = null;
        StringBuilder content = new StringBuilder();
        try {
            reader = new InputStreamReader(in);
            char[] buffer = new char[1024];
            int head = 0;
            while ((head = reader.read(buffer)) > 0) {
                content.append(new String(buffer, 0, head));
            }
            return content.toString();
        } finally {
            if (null != in)
                in.close();
            if (null != reader)
                reader.close();
        }
    }

    /**
     * 设置Http连接属性
     * @param conn
     *             http连接
     * @return
     * @throws ProtocolException
     * @throws Exception
     */
    private static void setHttpUrlConnection(HttpURLConnection conn,
                                             String requestMethod) throws ProtocolException {
        conn.setRequestMethod(requestMethod);
        conn.setRequestProperty("content-encoding", "utf8");
        conn.setRequestProperty("accept", "application/json");
        conn.setRequestProperty("Accept-Charset", "UTF-8");
        conn.setRequestProperty("Accept-Language", "zh-CN");
        conn.setRequestProperty("User-Agent",
            "Mozilla/5.0 (compatible; MSIE 9.0; Windows NT 6.1; WOW64; Trident/5.0)");
        conn.setRequestProperty("Proxy-Connection", "Keep-Alive");

        System.out.println(conn.getRequestMethod());
        if (null != requestMethod && POST.equals(requestMethod)) {
            conn.setDoOutput(true);
            conn.setDoInput(true);
        }
    }

    /**
     * 将参数转为路径字符串
     * @param paramMap
     *             参数
     * @return
     */
    private static String getParamString(Map<String, String> paramMap) {
        if (null == paramMap || paramMap.isEmpty()) {
            return "";
        }
        StringBuilder builder = new StringBuilder();
        for (String key : paramMap.keySet()) {
            builder.append("&").append(key).append("=").append(paramMap.get(key));
        }
        return new String(builder.deleteCharAt(0).toString());
    }

    public static void main(String[] args) throws UnsupportedEncodingException {
        String url = "http://localhost:8080/collectData.do";

        Map<String, String> params = new HashMap<>();

　　　　params.put("name", "jerry");
        params.put("age", "18");
        params.put("sex", "man");

        try {
            System.out.println(post(url, mapParam));
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}

转自：其他（已找不到原文）

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