The JDK provides some support for stateless protocol requests (HTTP). Below I will describe a small example (component) I wrote:
First let's build a request class (HttpRequester).
This class encapsulates the code for JAVA to implement simple requests, as follows:
The code copy is as follows:
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.URL;
import java.nio.charset.Charset;
import java.util.Map;
import java.util.Vector;
/**
* HTTP request object
*
* @author YYmmiinngg
*/
public class HttpRequester {
private String defaultContentEncoding;
public HttpRequester() {
this.defaultContentEncoding = Charset.defaultCharset().name();
}
/**
* Send a GET request
*
* @param urlString
* URL address
* @return Response object
* @throws IOException
*/
public HttpRespons sendGet(String urlString) throws IOException {
return this.send(urlString, "GET", null, null);
}
/**
* Send a GET request
*
* @param urlString
* URL address
* @param params
* Parameter set
* @return Response object
* @throws IOException
*/
public HttpRespons sendGet(String urlString, Map<String, String> params)
throws IOException {
return this.send(urlString, "GET", params, null);
}
/**
* Send a GET request
*
* @param urlString
* URL address
* @param params
* Parameter set
* @param properties
* Request attributes
* @return Response object
* @throws IOException
*/
public HttpRespons sendGet(String urlString, Map<String, String> params,
Map<String, String> properties) throws IOException {
return this.send(urlString, "GET", params, properties);
}
/**
* Send POST request
*
* @param urlString
* URL address
* @return Response object
* @throws IOException
*/
public HttpRespons sendPost(String urlString) throws IOException {
return this.send(urlString, "POST", null, null);
}
/**
* Send POST request
*
* @param urlString
* URL address
* @param params
* Parameter set
* @return Response object
* @throws IOException
*/
public HttpRespons sendPost(String urlString, Map<String, String> params)
throws IOException {
return this.send(urlString, "POST", params, null);
}
/**
* Send POST request
*
* @param urlString
* URL address
* @param params
* Parameter set
* @param properties
* Request attributes
* @return Response object
* @throws IOException
*/
public HttpRespons sendPost(String urlString, Map<String, String> params,
Map<String, String> properties) throws IOException {
return this.send(urlString, "POST", params, properties);
}
/**
* Send HTTP request
*
* @param urlString
* @return Reflection object
* @throws IOException
*/
private HttpRespons send(String urlString, String method,
Map<String, String> parameters, Map<String, String> properties)
throws IOException {
HttpURLConnection urlConnection = null;
if (method.equalsIgnoreCase("GET") && parameters != null) {
StringBuffer param = new StringBuffer();
int i = 0;
for (String key : parameters.keySet()) {
if (i == 0)
param.append("?");
else
param.append("&");
param.append(key).append("=").append(parameters.get(key));
i++;
}
urlString += param;
}
URL url = new URL(urlString);
urlConnection = (HttpURLConnection) url.openConnection();
urlConnection.setRequestMethod(method);
urlConnection.setDoOutput(true);
urlConnection.setDoInput(true);
urlConnection.setUseCaches(false);
if (propertys != null)
for (String key : properties.keySet()) {
urlConnection.addRequestProperty(key, properties.get(key));
}
if (method.equalsIgnoreCase("POST") && parameters != null) {
StringBuffer param = new StringBuffer();
for (String key : parameters.keySet()) {
param.append("&");
param.append(key).append("=").append(parameters.get(key));
}
urlConnection.getOutputStream().write(param.toString().getBytes());
urlConnection.getOutputStream().flush();
urlConnection.getOutputStream().close();
}
return this.makeContent(urlString, urlConnection);
}
/**
* Get the response object
*
* @param urlConnection
* @return Response object
* @throws IOException
*/
private HttpRespons makeContent(String urlString,
HttpURLConnection urlConnection) throws IOException {
HttpRespons httpResponser = new HttpRespons();
try {
InputStream in = urlConnection.getInputStream();
BufferedReader bufferedReader = new BufferedReader(
new InputStreamReader(in));
httpResponser.contentCollection = new Vector<String>();
StringBuffer temp = new StringBuffer();
String line = bufferedReader.readLine();
while (line != null) {
httpResponser.contentCollection.add(line);
temp.append(line).append("/r/n");
line = bufferedReader.readLine();
}
bufferedReader.close();
String ecod = urlConnection.getContentEncoding();
if (ecod == null)
ecod = this.defaultContentEncoding;
httpResponser.urlString = urlString;
httpResponser.defaultPort = urlConnection.getURL().getDefaultPort();
httpResponser.file = urlConnection.getURL().getFile();
httpResponser.host = urlConnection.getURL().getHost();
httpResponser.path = urlConnection.getURL().getPath();
httpResponser.port = urlConnection.getURL().getPort();
httpResponser.protocol = urlConnection.getURL().getProtocol();
httpResponser.query = urlConnection.getURL().getQuery();
httpResponser.ref = urlConnection.getURL().getRef();
httpResponser.userInfo = urlConnection.getURL().getUserInfo();
httpResponser.content = new String(temp.toString().getBytes(), ecod);
httpResponser.contentEncoding = ecod;
httpResponser.code = urlConnection.getResponseCode();
httpResponser.message = urlConnection.getResponseMessage();
httpResponser.contentType = urlConnection.getContentType();
httpResponser.method = urlConnection.getRequestMethod();
httpResponser.connectTimeout = urlConnection.getConnectTimeout();
httpResponser.readTimeout = urlConnection.getReadTimeout();
return httpResponser;
} catch (IOException e) {
throw e;
} finally {
if (urlConnection != null)
urlConnection.disconnect();
}
}
/**
* The default response character set
*/
public String getDefaultContentEncoding() {
return this.defaultContentEncoding;
}
/**
* Set the default response character set
*/
public void setDefaultContentEncoding(String defaultContentEncoding) {
this.defaultContentEncoding = defaultContentEncoding;
}
}
Secondly, let’s take a look at the response object (HttpRespons). The response object is actually just a data BEAN, which encapsulates the result data of the request response, as follows:
The code copy is as follows:
import java.util.Vector;
/**
* Response object
*/
public class HttpRespons {
String urlString;
int defaultPort;
String file;
String host;
String path;
int port;
String protocol;
String query;
String ref;
String userInfo;
String contentEncoding;
String content;
String contentType;
int code;
String message;
String method;
int connectTimeout;
int readTimeout;
Vector<String> contentCollection;
public String getContent() {
return content;
}
public String getContentType() {
return contentType;
}
public int getCode() {
return code;
}
public String getMessage() {
return message;
}
public Vector<String> getContentCollection() {
return contentCollection;
}
public String getContentEncoding() {
return contentEncoding;
}
public String getMethod() {
return method;
}
public int getConnectTimeout() {
return connectTimeout;
}
public int getReadTimeout() {
return readTimeout;
}
public String getUrlString() {
return urlString;
}
public int getDefaultPort() {
return defaultPort;
}
public String getFile() {
return file;
}
public String getHost() {
return host;
}
public String getPath() {
return path;
}
public int getPort() {
return port;
}
public String getProtocol() {
return protocol;
}
public String getQuery() {
return query;
}
public String getRef() {
return ref;
}
public String getUserInfo() {
return userInfo;
}
}
Finally, let's write an application class to test whether the above code is correct
The code copy is as follows:
import com.yao.http.HttpRequester;
import com.yao.http.HttpRespons;
public class Test {
public static void main(String[] args) {
try {
HttpRequester request = new HttpRequester();
HttpRespons hr = request.sendGet("//www.VeVB.COM");
System.out.println(hr.getUrlString());
System.out.println(hr.getProtocol());
System.out.println(hr.getHost());
System.out.println(hr.getPort());
System.out.println(hr.getContentEncoding());
System.out.println(hr.getMethod());
System.out.println(hr.getContent());
} catch (Exception e) {
e.printStackTrace();
}
}
}