Http（get，post）及HttpClient（get，post）的简单使用

  

1. 使用 Http 的 Get 方式读取网络数据

  

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.net.MalformedURLException;
import java.net.URL;
import java.net.URLConnection;

public class TestHttpGet {

    public static void main(String[] args) {
        new ReadByGet().start();
    }
    static class ReadByGet extends Thread{
        @Override
        public void run() {
            try {
                URL url = new URL("http://fanyi.youdao.com/openapi.do?keyfrom=jkxyuvi&key=1530995034&type=data&doctype=xml&version=1.1&q=welcom");
                URLConnection connection = url.openConnection();
                InputStream is = connection.getInputStream();
                InputStreamReader isr = new InputStreamReader(is);
                BufferedReader br = new BufferedReader(isr);
                
                String line;
                StringBuilder builder = new StringBuilder();
                
                while((line = br.readLine())!=null){
                    builder.append(line);
                    
                }
                br.close();
                isr.close();
                is.close();
                
                System.out.println(builder.toString());
                
            } catch (MalformedURLException e) {
                
                e.printStackTrace();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    }

}

2. 使用 Http 的 Post 方式与网络交互通信

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;

public class TestHttpPost {

    public static void main(String[] args) {
        new ReadByPost().start();
    }

}
class ReadByPost 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");
            connection.setDoInput(true);
            connection.setDoOutput(true);
            connection.setRequestMethod("POST");
            
            
            
            OutputStream os = connection.getOutputStream();
            OutputStreamWriter osw = new OutputStreamWriter(os);
            BufferedWriter bw = new BufferedWriter(osw);
            
            
            
            bw.write("keyfrom=jkxyuvi&key=1530995034&type=data&doctype=xml&version=1.1&q=welcome");
            bw.flush();//强制输出
            
            InputStream is = connection.getInputStream();
            InputStreamReader isr = new InputStreamReader(is);
            BufferedReader br = new BufferedReader(isr);
            String line;
            StringBuilder builder = new StringBuilder();
            while((line = br.readLine())!=null){
                builder.append(line);
            }
            
            bw.close();
            osw.close();
            os.close();
            br.close();
            isr.close();
            is.close();
            System.out.println(builder.toString());
            
        } catch (MalformedURLException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
    }
}

3. 使用HttpClient进行Get方式通信

先下载HttpClient相关依赖包，地址： http://hc.apache.org/downloads.cgi

import java.io.IOException;

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.methods.HttpGet;
import org.apache.http.impl.client.HttpClients;
import org.apache.http.util.EntityUtils;

public class TestHttpClientGet {

    public static void main(String[] args) {
        new Get().start();
    }

}
class Get extends Thread{
    
    HttpClient client = HttpClients.createDefault();
    
    
    @Override
    public void run() {
        
        HttpGet get = new HttpGet("http://www.bai.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();
        }
        
    }
}

4. 使用 HttpClient 进行 Post 方式通信

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.HttpPost;
import org.apache.http.impl.client.HttpClients;
import org.apache.http.message.BasicNameValuePair;
import org.apache.http.util.EntityUtils;

public class TestHttpClientPost {

    public static void main(String[] args) {
        new Post().start();
    }

}
class Post extends Thread{
    
    HttpClient client = HttpClients.createDefault();
    
    @Override
    public void run() {
        HttpPost post = new HttpPost("http://fanyi.youdao.com/openapi.do");
        
        try {
            List<BasicNameValuePair> parameters = new ArrayList<>();
            parameters.add(new BasicNameValuePair("keyfrom", "jkxyuvi"));
            parameters.add(new BasicNameValuePair("key", "1530995034"));
            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,"UTF-8"));
            
            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();
        }
        
         
        
    }
}

与java自带的http通信，HttpClient用起来确实方便的多。