Java Socket编程 - 获取WEB站点主页信息

package com.gloomyfish.socket.tutorial.one;

import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;
import java.net.InetAddress;
import java.net.InetSocketAddress;
import java.net.Socket;
import java.net.SocketAddress;
import java.net.UnknownHostException;

public class HomePageVisitor {
private Socket client;
private SocketAddress address;
public HomePageVisitor(String hostName, int port) throws UnknownHostException, IOException {
client = new Socket();
address = new InetSocketAddress(hostName, port);
}
// GET http://localhost:8080/blank/Welcome.do HTTP/1.1\r\n
public void printHomePageInfo(String httpString)
{
try {
// Get local host info
        InetAddress inetAddress = InetAddress.getLocalHost();
        System.out.println("Host Address = " + inetAddress.getHostAddress());
        System.out.println("Hostname = " + inetAddress.getHostName());
       
        // visit the WEBSITE
client.connect(address);
BufferedWriter bufferedWriter = new BufferedWriter(new OutputStreamWriter(client.getOutputStream(), "UTF8"));
bufferedWriter.write(httpString);

// -- HTTP/1.1 400 Bad Request if not send \r\n
bufferedWriter.write("\r\n");
bufferedWriter.flush();
System.out.println("http request send out");

BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(client.getInputStream()));
String content = null;
while((content = bufferedReader.readLine()) != null) {
if(getStatusCde(content) == 400) {
System.err.println("HTTP/1.1 | HTTP/1.0 400 Bad Request");
break;
}
System.out.println("response contect -->> " + content);
}
} catch(Exception e) {
e.printStackTrace();
}

}

/**
* <p> try to parse the HTTP response content</p>
* @param content
* @return status of HTTP
*/
private static int getStatusCde(String content) {
int status = 200; // default OK response
if(content == null || "".equals(content))
return status;
else if (!content.contains("HTTP/1.1")&& !content.contains("HTTP/1.0"))
return status;
else if(content.contains("400") && content.contains("HTTP/1.1")
|| content.contains("HTTP/1.0")) {
status = 400;
}
return status;
}

public static void main(String[] args) {
try {
HomePageVisitor httpVisitor = new HomePageVisitor("www.csdn.net", 80);
httpVisitor.printHomePageInfo("GET http://www.csdn.net HTTP/1.0\r\n");
} catch (UnknownHostException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
}
}