一、JDK自带的http通信机制--java.net.URL

package com.wjy;import java.io.BufferedReader;import java.io.BufferedWriter;import java.io.IOException;import java.io.InputStream;import java.io.InputStreamReader;import java.io.OutputStream;import java.io.OutputStreamWriter;import java.net.HttpURLConnection;import java.net.MalformedURLException;import java.net.URL;import java.net.URLConnection;public class TestURL {    public static void main(String[] args) {        new GetRun().start();//get请求        new PostRun().start();//post请求    }}class GetRun extends Thread{    public void run() {        try {            //doctype=xml/json/jsonp            URL url = new URL("http://fanyi.youdao.com/openapi.do?keyfrom=wjy-test&key=36384249&type=data&doctype=jsonp&callback=show&version=1.1&q=hello");            URLConnection connection = url.openConnection();            InputStream in = connection.getInputStream();            InputStreamReader isr = new InputStreamReader(in,"utf-8");            BufferedReader br = new BufferedReader(isr);            String line;            StringBuilder sb = new StringBuilder();            while((line = br.readLine()) != null)            {                sb.append(line);            }            br.close();            isr.close();            in.close();            System.out.println(sb.toString());        } catch (MalformedURLException e) {            e.printStackTrace();        } catch (IOException e) {            e.printStackTrace();        }    }}class PostRun extends Thread{    @Override    public void run() {        try {            URL url = new URL("http://fanyi.youdao.com/openapi.do");            HttpURLConnection connection = (HttpURLConnection) url.openConnection();            connection.addRequestProperty("encoding", "UTF-8");//添加请求属性            connection.setDoInput(true);//允许输入            connection.setDoOutput(true);//允许输出            connection.setRequestMethod("POST");//POST请求 要在获取输入输出流之前设置  否则报错            //输出            OutputStream os = connection.getOutputStream();            OutputStreamWriter osw = new OutputStreamWriter(os);            BufferedWriter bw = new BufferedWriter(osw);            bw.write("keyfrom=wjy-test&key=36384249&type=data&doctype=xml&version=1.1&q=welcome");            bw.flush();                        //输入            InputStream in = connection.getInputStream();            InputStreamReader isr = new InputStreamReader(in,"UTF-8");            BufferedReader br = new BufferedReader(isr);                        String line;            StringBuilder sb = new StringBuilder();            while((line = br.readLine()) != null)            {                sb.append(line);            }            bw.close();            osw.close();            os.close();            br.close();            isr.close();            in.close();                        System.out.println(sb.toString());                    } catch (MalformedURLException e) {            e.printStackTrace();        } catch (IOException e) {            e.printStackTrace();        }            }    }

 

二、apache中HttpComponents项目HttpClient工具

package com.wjy;import java.io.IOException;import java.util.ArrayList;import java.util.List;import org.apache.http.HttpEntity;import org.apache.http.HttpResponse;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.HttpClients;import org.apache.http.message.BasicNameValuePair;import org.apache.http.util.EntityUtils;public class TestHttpclient {    /**     * 从apache官网下载HttpComponents项目jar包     */    public static void main(String[] args) {        //new Get().start();        new Post().start();    }}class Get extends Thread{    HttpClient client = HttpClients.createDefault();        @Override    public void run() {        HttpGet get = new HttpGet("http://www.baidu.com");        try {            HttpResponse response = client.execute(get);            HttpEntity entity = response.getEntity();            String result = EntityUtils.toString(entity, "UTF-8");            System.out.println(result);        } catch (ClientProtocolException e) {            e.printStackTrace();        } catch (IOException e) {            e.printStackTrace();        }            }}class Post extends Thread{HttpClient client = HttpClients.createDefault();        @Override    public void run() {        HttpPost post = new HttpPost("http://fanyi.youdao.com/openapi.do");        try {            List
     
       parameters = new ArrayList
      
       ();            parameters.add(new BasicNameValuePair("keyfrom", "wjy-test"));            parameters.add(new BasicNameValuePair("key", "36384249"));            parameters.add(new BasicNameValuePair("type", "data"));            parameters.add(new BasicNameValuePair("doctype", "xml"));            parameters.add(new BasicNameValuePair("version", "1.1"));            parameters.add(new BasicNameValuePair("q", "welcome"));            post.setEntity(new UrlEncodedFormEntity(parameters));            HttpResponse response = client.execute(post);            HttpEntity entity = response.getEntity();            String result = EntityUtils.toString(entity, "UTF-8");            System.out.println(result);        } catch (ClientProtocolException e) {            e.printStackTrace();        } catch (IOException e) {            e.printStackTrace();        }            }}