向指定url发送Get/Post请求

• 1、向指定url发送Get/Post请求
• 2、HttpUtil

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工具类–向指定url发送Get/Post请求

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1、向指定url发送Get/Post请求

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;
import java.io.PrintWriter;
import java.net.URL;
import java.net.URLConnection;
import java.util.List;
import java.util.Map;

public class HTTPRequest {

    /**
     * 向指定URL发送GET方法的请求
     *
     * @param url
     *            发送请求的URL
     * @param param
     *            请求参数，请求参数应该是 name1=value1&name2=value2 的形式。
     * @return URL 所代表远程资源的响应结果
     */
    public static String sendGet(String url, String param) {
        String result = "";
        BufferedReader in = null;
        try {
            String urlNameString = url + "?" + param;
            URL realUrl = new URL(urlNameString);
            // 打开和URL之间的连接
            URLConnection connection = realUrl.openConnection();
            // 设置通用的请求属性
            connection.setRequestProperty("accept", "*/*");
            connection.setRequestProperty("connection", "Keep-Alive");
            connection.setRequestProperty("user-agent",
                    "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1;SV1)");
            // 建立实际的连接
            connection.connect();
            // 获取所有响应头字段
            Map<String, List<String>> map = connection.getHeaderFields();
            // 遍历所有的响应头字段
            for (String key : map.keySet()) {
                System.out.println(key + "--->" + map.get(key));
            }
            // 定义 BufferedReader输入流来读取URL的响应
            in = new BufferedReader(new InputStreamReader(
                    connection.getInputStream()));
            String line;
            while ((line = in.readLine()) != null) {
                result += line;
            }
        } catch (Exception e) {
            System.out.println("发送GET请求出现异常！" + e);
            e.printStackTrace();
        }
        // 使用finally块来关闭输入流
        finally {
            try {
                if (in != null) {
                    in.close();
                }
            } catch (Exception e2) {
                e2.printStackTrace();
            }
        }
        return result;
    }

    /**
     * 向指定 URL 发送POST方法的请求
     *
     * @param url
     *            发送请求的 URL
     * @param param
     *            请求参数，请求参数应该是 name1=value1&name2=value2 的形式。
     * @return 所代表远程资源的响应结果
     */
    public static String sendPost(String url, String param) throws Exception{
        PrintWriter out = null;
        BufferedReader in = null;
        String result = "";
        try {
            URL realUrl = new URL(url);
            // 打开和URL之间的连接
            URLConnection conn = realUrl.openConnection();
            // 设置通用的请求属性
            conn.setRequestProperty("accept", "*/*");
            conn.setRequestProperty("connection", "Keep-Alive");
            conn.setRequestProperty("user-agent",
                    "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1;SV1)");
            // 发送POST请求必须设置如下两行
            conn.setDoOutput(true);
            conn.setDoInput(true);
            // 获取URLConnection对象对应的输出流
            out = new PrintWriter(new OutputStreamWriter(conn.getOutputStream(), "utf-8"));
            // 发送请求参数
            out.print(param);
            // flush输出流的缓冲
            out.flush();
            // 定义BufferedReader输入流来读取URL的响应
            in = new BufferedReader( new InputStreamReader(conn.getInputStream(), "utf-8"));
            String line;
            while ((line = in.readLine()) != null) {
                result += line;
            }
        } catch (Exception e) {
            System.out.println("发送 POST 请求出现异常！"+e);
            e.printStackTrace();
        }
        //使用finally块来关闭输出流、输入流
        finally{
            try{
                if(out!=null){
                    out.close();
                }
                if(in!=null){
                    in.close();
                }
            }
            catch(IOException ex){
                ex.printStackTrace();
            }
        }
        return result;
    } 

}

2、HttpUtil

import java.io.IOException
import java.util
import org.apache.http.client.ClientProtocolException
import org.apache.http.client.entity.UrlEncodedFormEntity
import org.apache.http.client.methods.{HttpGet, HttpPost}
import org.apache.http.impl.client.{DefaultHttpClient, HttpClients}
import org.apache.http.message.BasicNameValuePair
import org.apache.http.util.EntityUtils
import org.slf4j.LoggerFactory
import scala.collection.JavaConversions._
import scala.reflect.macros.ParseException

object HttpClientUtils {

  val logger = LoggerFactory.getLogger("out")

  def get(url: String): String = {
    val httpclient = new DefaultHttpClient()
    try {
      // 创建httpget.
      val httpget = new HttpGet(url)
      // 执行get请求.
      val response = httpclient.execute(httpget)
      try {
        // 获取响应实体
        val entity = response.getEntity()
        EntityUtils.toString(entity, "utf-8")
      } finally {
        response.close()
      }
    } catch {
        case ex: ClientProtocolException => {logger.error(ex.getMessage);null}
        case ex: ParseException => {logger.error(ex.getMessage);null}
        case ex: IOException => {logger.error(ex.getMessage);null}
    } finally {
      // 关闭连接,释放资源
      httpclient.close()
    }

  }

  def post(url: String, map: Map[String,String]): String = {
    //创建httpclient对象
    val client = HttpClients.createDefault
    try {
      //创建post方式请求对象
      val httpPost = new HttpPost(url)
      //装填参数
      val nvps:util.ArrayList[BasicNameValuePair] = new util.ArrayList[BasicNameValuePair]
      if (map != null) {
        for (entry <- map.entrySet) {
          nvps.add(new BasicNameValuePair(entry.getKey, entry.getValue))
        }
      }
      //设置参数到请求对象中
      httpPost.setEntity(new UrlEncodedFormEntity(nvps, "UTF-8"))
      //执行请求操作，并拿到结果（同步阻塞）
      val response = client.execute(httpPost)
      //获取结果实体
      val entity = response.getEntity
      var body = ""
      if (entity != null) { //按指定编码转换结果实体为String类型
        body = EntityUtils.toString(entity, "UTF-8")
      }
      //释放链接
      response.close()
      body
    } finally {
       client.close()
    }
  }
}