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29 Cards in this Set
- Front
- Back
java class that reads bytes and decodes them into characters. |
InputStreamReader |
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Buffers an InputStreamReader, so you can read in line by line.
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BufferedReader
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What is the variable name for getting user input? |
System.in |
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takes a text file and converts it into a character stream
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FileReader |
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Writes Characters from stream |
FileWriter
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Buffers an outputstream, so you can write to it. |
BufferedWriter |
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Reads a binary input stream |
FileInputStream |
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writes a binary stream |
FileOutputStream |
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How do you copy a text file? |
FileReader fr = new FileReader("P:\\foo.txt"); BufferedReader br = new BufferedReader(fr); FileWriter fw = new FileWriter("b.txt"); BufferedWriter bw = new BufferedWriter(fw); String line = null; while ((line=br.readLine())!=null){ bw.write(line); } |
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What class do we need to import to do file reads/writes? |
java.io.* |
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How do i set up a java function that may have an error related to reading/writing? |
public static void main(String[] args) throws IOException{ } |
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How do you set up a Socket Server? |
try {
ServerSocket server = new ServerSocket(8888); while (true) { Socket incoming = server.accept(); // obtain a client socket // handle client request by reading from and writing to the socket … }} catch (IOException e) { // handle exception on creating a server socket} |
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How do you set up a Socket Client? |
try { Socket s = new Socket(“localhost”, 8888);
// send and receive data by using out and in … } catch (IOException e) { // handle exception …} |
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What is a Servlet? |
Basically, a java program that runs on theserver. It creates dynamic web pages
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What does a Servlet need? |
1.JavaServer Web Development Kit(JSWDK) E.g., eclipse or Netbeans
2.Servlet capable server (Tomcat is the most common one) 3.Servlet code |
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What are some examples of servlet servers? |
Weblogic, JBoss, Tomcat |
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What do we need to import to use a servlet? |
Javax.servlet.* |
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JVM means? |
Java Virtual Machine |
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print line to console in java |
System.out.println("blah); |
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type that can be true of false? (exact name in Java) |
boolean |
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class than contains multiple characters? (exact name in Java) |
String |
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declare an array in Java. |
int[] foo = new int[333]; |
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When can an array be initialized like so: int[] values = { 12, 24, -23, 47 }; |
Only when the variable is declared. |
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How do i get the total number of elements in a (full) array in Java? |
int length = array.length; |
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How to send some text between socket server and client? |
out.println(“Hello!”);
out.flush(); |
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How to read a line from a socket server? |
str = in.readLine() ;
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How to set up to read write with sockets? |
BufferedReader in = new BufferedReader(new InputStreamReader( socket.getInputStream()));
PrintWriter out = new PrintWriter(new OutputStreamWriter( socket.getOutputStream())); |
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How to get a variable from html in java |
String email = request.getParameter("email");
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How to get a part in java from html |
Part filePart = request.getPart("file");
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