Java Programming Tricks 2

1. Properties ResourceBundle类的路径问题

　　System.out.println(System.getProperty("user.dir"));  //这个是去工程的绝对路径的
  　System.out.println(Thread.currentThread().getContextClassLoader().getResource(""));//这个是去当　　　　　　前classpath的uri的!
  　new Properties().load(new FileInputStream("test.properties"));//这里说明test文件在工程的跟目录下!

　　new Properties().load(new FileInputStream("test/test.properties"));//说明,在工程底下的test的文件夹底下的文件test.properties!
  　ResourceBundle rs = ResourceBundle.getBundle("org.hello");//这里说明,hello文件就是在于classpath底下的,org包底下有这个文件hello.properties~也就是说.../bin/这个是classpath绝对路径!

 

2、一个http请求的头部

GET /index.html HTTP/1.1

Accept: image/gif, image/x-xbitmap, image/jpeg, image/pjpeg, application/x-shockwave-flash, application/msword, application/vnd.ms-excel, application/vnd.ms-powerpoint, */*

Accept-Language: en-us,zh-cn;q=0.5

Accept-Encoding: gzip, deflate

User-Agent: Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.0; .NET CLR 2.0.50727)

Host: localhost:8080

Connection: Keep-Alive

 

 

 

 

 

out.println("GET http://fxcm.fx-performance.com/SystemTickets.aspx?bkr=1"

 

+ "&SystemID=" + systemID + "&InstrumentID=" + instrumentID

+ "&FromDate=20090101&ToDate=20090701 HTTP/1.0");

out.println("Host: " + "fxcm.fx-performance.com");

out.println("User-Agent: " + "Mozilla/5.0 (Windows; U; Windows NT 5.0; en-US; rv:1.8.1.9) Gecko/20071025 Firefox/2.0.0.9");

out.println("Accept: " + "text/xml,application/xml,application/xhtml+xml,text/html;q=0.9,text/plain;q=0.8,image/png,*/*;q=0.5");

out.println("Accept-Language: " + "en-us,zh-cn;q=0.5");

//out.println("Accept-Encoding: " + "gzip,deflate");

out.println("Accept-Charset: " + "ISO-8859-1,utf-8;q=0.7,*;q=0.7");

out.println("Keep-Alive: " + "300");

out.println("Proxy-Connection: " + "keep-alive");

//out.println("Cookie: " + "BCSI-CSA9B5F27E=2; BCSI-CSA9B5CE25=2");

out.println("Cache-Control: " + "max-age=0");

out.println("");// 这句很关键，告诉server这段话说完了。然后server端的in.readLine的while循环才能跳出向后执行。

 

private void fetchData() {

  Socket socket = null;
  PrintWriter out = null;
  BufferedReader in = null;
  String fromServer = "";

  while (1 == 1) {

   try {
    
    Thread.sleep(10000);

    socket = new Socket("webproxy.ssmb.com", 8080);
    out = new PrintWriter(socket.getOutputStream(), true);
    in = new BufferedReader(new InputStreamReader(socket.getInputStream()));

    out.println("GET http://www.dailyfx.com.hk/informer/fxcm_pricedde_sc.php?temp=1");
    out.println("Host: www.dailyfx.com.hk");
    out.println("Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8");
    out.println("Accept-Language: en-us");
    out.println("Accept-Encoding: gzip,deflate");
    out.println("Accept-Charset: ISO-8859-1,utf-8;q=0.7,*;q=0.7");
    out.println("Keep-Alive: 300");
    out.println("Proxy-Connection: keep-alive");
    out.println("");

    while ((fromServer = in.readLine()) != null) {
     System.out.print(fromServer);
    }
    System.out.println();

   } catch (Exception e) {
    e.printStackTrace();
   } finally {
    try {
     out.close();
     in.close();
     socket.close();
    } catch (IOException e) {
     e.printStackTrace();
    }
   }
  }
 } 

 

 

 

 

 

 

 

3、inputstream to string

 

input是一个InputStream的对象。

public void parse() { // Read a set of characters from the socket StringBuffer request = new StringBuffer(2048); int i; byte[] buffer = new byte[2048]; try { i = input.read(buffer); } catch (IOException e) { e.printStackTrace(); i = -1; } for (int j = 0; j < i; j++) { request.append((char) buffer[j]); } System.out.print(request.toString()); uri = parseUri(request.toString()); }