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
1 import java.io.BufferedReader; 2 import java.io.IOException; 3 import java.io.InputStream; 4 import java.io.InputStreamReader; 5 import java.net.MalformedURLException; 6 import java.net.URL; 7 import java.net.URLConnection; 8 9 public class TestHttpGet { 10 11 public static void main(String[] args) { 12 new ReadByGet().start(); 13 } 14 static class ReadByGet extends Thread{ 15 @Override 16 public void run() { 17 try { 18 URL url = new URL("http://fanyi.youdao.com/openapi.do?keyfrom=jkxyuvi&key=1530995034&type=data&doctype=xml&version=1.1&q=welcom"); 19 URLConnection connection = url.openConnection(); 20 InputStream is = connection.getInputStream(); 21 InputStreamReader isr = new InputStreamReader(is); 22 BufferedReader br = new BufferedReader(isr); 23 24 String line; 25 StringBuilder builder = new StringBuilder(); 26 27 while((line = br.readLine())!=null){ 28 builder.append(line); 29 30 } 31 br.close(); 32 isr.close(); 33 is.close(); 34 35 System.out.println(builder.toString()); 36 37 } catch (MalformedURLException e) { 38 39 e.printStackTrace(); 40 } catch (IOException e) { 41 e.printStackTrace(); 42 } 43 } 44 } 45 46 }
2. 使用 Http 的 Post 方式与网络交互通信
1 import java.io.BufferedReader; 2 import java.io.BufferedWriter; 3 import java.io.IOException; 4 import java.io.InputStream; 5 import java.io.InputStreamReader; 6 import java.io.OutputStream; 7 import java.io.OutputStreamWriter; 8 import java.net.HttpURLConnection; 9 import java.net.MalformedURLException; 10 import java.net.URL; 11 12 public class TestHttpPost { 13 14 public static void main(String[] args) { 15 new ReadByPost().start(); 16 } 17 18 } 19 class ReadByPost extends Thread{ 20 @Override 21 public void run() { 22 try { 23 URL url = new URL("http://fanyi.youdao.com/openapi.do"); 24 HttpURLConnection connection = (HttpURLConnection) url.openConnection(); 25 connection.addRequestProperty("encoding", "UTF-8"); 26 connection.setDoInput(true); 27 connection.setDoOutput(true); 28 connection.setRequestMethod("POST"); 29 30 31 32 OutputStream os = connection.getOutputStream(); 33 OutputStreamWriter osw = new OutputStreamWriter(os); 34 BufferedWriter bw = new BufferedWriter(osw); 35 36 37 38 bw.write("keyfrom=jkxyuvi&key=1530995034&type=data&doctype=xml&version=1.1&q=welcome"); 39 bw.flush();//强制输出 40 41 InputStream is = connection.getInputStream(); 42 InputStreamReader isr = new InputStreamReader(is); 43 BufferedReader br = new BufferedReader(isr); 44 String line; 45 StringBuilder builder = new StringBuilder(); 46 while((line = br.readLine())!=null){ 47 builder.append(line); 48 } 49 50 bw.close(); 51 osw.close(); 52 os.close(); 53 br.close(); 54 isr.close(); 55 is.close(); 56 System.out.println(builder.toString()); 57 58 } catch (MalformedURLException e) { 59 // TODO Auto-generated catch block 60 e.printStackTrace(); 61 } catch (IOException e) { 62 // TODO Auto-generated catch block 63 e.printStackTrace(); 64 } 65 } 66 }
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
1 import java.io.IOException; 2 3 import org.apache.http.HttpEntity; 4 import org.apache.http.HttpResponse; 5 import org.apache.http.client.ClientProtocolException; 6 import org.apache.http.client.HttpClient; 7 import org.apache.http.client.methods.HttpGet; 8 import org.apache.http.impl.client.HttpClients; 9 import org.apache.http.util.EntityUtils; 10 11 public class TestHttpClientGet { 12 13 public static void main(String[] args) { 14 new Get().start(); 15 } 16 17 } 18 class Get extends Thread{ 19 20 HttpClient client = HttpClients.createDefault(); 21 22 23 @Override 24 public void run() { 25 26 HttpGet get = new HttpGet("http://www.bai.com"); 27 try { 28 HttpResponse response = client.execute(get); 29 HttpEntity entity = response.getEntity(); 30 String result = EntityUtils.toString(entity,"UTF-8"); 31 System.out.println(result); 32 } catch (ClientProtocolException e) { 33 e.printStackTrace(); 34 } catch (IOException e) { 35 e.printStackTrace(); 36 } 37 38 } 39 }
4. 使用 HttpClient 进行 Post 方式通信
1 import java.io.IOException; 2 import java.util.ArrayList; 3 import java.util.List; 4 5 import org.apache.http.HttpEntity; 6 import org.apache.http.HttpResponse; 7 import org.apache.http.client.ClientProtocolException; 8 import org.apache.http.client.HttpClient; 9 import org.apache.http.client.entity.UrlEncodedFormEntity; 10 import org.apache.http.client.methods.HttpPost; 11 import org.apache.http.impl.client.HttpClients; 12 import org.apache.http.message.BasicNameValuePair; 13 import org.apache.http.util.EntityUtils; 14 15 public class TestHttpClientPost { 16 17 public static void main(String[] args) { 18 new Post().start(); 19 } 20 21 } 22 class Post extends Thread{ 23 24 HttpClient client = HttpClients.createDefault(); 25 26 @Override 27 public void run() { 28 HttpPost post = new HttpPost("http://fanyi.youdao.com/openapi.do"); 29 30 try { 31 List<BasicNameValuePair> parameters = new ArrayList<>(); 32 parameters.add(new BasicNameValuePair("keyfrom", "jkxyuvi")); 33 parameters.add(new BasicNameValuePair("key", "1530995034")); 34 parameters.add(new BasicNameValuePair("type", "data")); 35 parameters.add(new BasicNameValuePair("doctype", "xml")); 36 parameters.add(new BasicNameValuePair("version", "1.1")); 37 parameters.add(new BasicNameValuePair("q", "welcome")); 38 post.setEntity(new UrlEncodedFormEntity(parameters,"UTF-8")); 39 40 HttpResponse response = client.execute(post); 41 HttpEntity entity = response.getEntity(); 42 String result = EntityUtils.toString(entity,"UTF-8"); 43 System.out.println(result); 44 45 } catch (ClientProtocolException e) { 46 e.printStackTrace(); 47 } catch (IOException e) { 48 e.printStackTrace(); 49 } 50 51 52 53 } 54 }
与java自带的http通信，HttpClient用起来确实方便的多。
