I'm having a bit of trouble with a college networks assignment at the moment. I've got a php bookstore project containing a database called "books", and a table called "books". I can create, update, delete books on my PHP Bookstore no problem, but the task of the assignment for college was to be able to create a HttpClientApp program that would be able to send a GET and POST to the bookstore adding in a new book into the database.
I'm not really sure if the code I've got for the HttpClient and HttpClientApp will be able to add a new book into the database. I was wondering if anyone could take a look at them both and see if I'm missing out on anything?
Here is the code in full for the MyHttpClient.java file: `
package com.example.bookstore;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.net.Socket;
public class MyHttpClient {
/*This creates the method MyHttpResponse execute, with a parameter of MyHttpRequest request which
* creates a variable called request that stores a reference to the MyHttpRequest object allowing us
* to use the objects methods in the MyHttpClient.java., we also add the throws IOException which
* will tell us if we have an error with the input or output in the program
*/
public MyHttpResponse execute(MyHttpRequest request) throws IOException {
/*
* Creates a variable called host of type string which
* stores reference for the method getHost() which is in
* the MyHttpRequest object. We then create a variable
* int port which also stores the reference to the method getPort()
* from the MyHttpRequest which gives us the port number of the avaya server
* we are contacting, if it is less than or equal to 0 it will be set to 80 as
* a default
*/
String host = request.getHost();
int port = request.getPort();
if (port <= 0) {
port = 80;
}
/*
* Create the variable bookSoc of type Socket and is given the paramters of host and port
* which is used in creating the socket to connect to the server
*/
Socket bookSoc = new Socket(host, port);
/*
* Declares a variable called response, which allows us to assign the MyHttpResponse object to the
* response variable. This stores a reference to the MyHttpResponse Object and allows us to reference and use
* the methods in the MyHttpResponse Object
*/
MyHttpResponse response = new MyHttpResponse();
/*
* Creates the a variable fromServer of type BufferedReader which is given the parameter of new
* InputStreamReader which then opens up the stream using the bookSoc.getInputStream method.
*/
BufferedReader fromServer = new BufferedReader(new InputStreamReader(bookSoc.getInputStream()));
/*The variable toServer of type PrintWriter creates the OutPutStream which allows to output to the
* Avaya Server
*/
PrintWriter toServer = new PrintWriter(bookSoc.getOutputStream(), true);
String method = request.getMethod();
/*
* The if statement works by checking if the the Method call equals a GET then
* create the string path and queryString to print out to the server the path and host
* which we require
*/
if (method.equals("GET")) {
String path = request.getPath();
String queryString = request.getQueryString();
toServer.println("GET " + path + " " + "HTTP/1.0");
toServer.println(queryString);
toServer.println("GET " + host);
toServer.println(+port);
/*
* Creates a variable called line of type String
* which will then be used to store the fromServer message, then we creates
* another var called status of type int which the substring which count the
* characters given. Then set the Status var equal to 200 OK
*/
String line;
line = fromServer.readLine();
int status = Integer.parseInt(line.substring(9, 12));
response.setStatus(status);
String descr = line.substring(13);
response.setDescription(descr);
/*
* Once the above code has been executed the do while do while loop,
* is then run, the first do while loop reads in a line from the server
* if the line is not null and line length is greater than 0,
* creates a name and value var and are added to the header.
*
* Then the while creates a var sbuf of type StringBuilder which
* creates a new StringBuilder, then the next do while prints out the body of the the
* repsonse, we then print the host and port number data.
*/
do {
line = fromServer.readLine();
if (line != null && line.length() > 0) {
String name = line.substring(0, line.indexOf(": "));
String value = line.substring(line.indexOf(": ") + 2);
response.addHeader(name, value);
}
} while (line != null && line.length() > 0);
StringBuilder sbuf = new StringBuilder();
do {
line = fromServer.readLine();
if (line != null) {
sbuf.append(line + "
");
}
} while (line != null);
String body = sbuf.toString();
response.setBody(body);
System.out.println("host: " + host);
System.out.println("port: " + String.valueOf(port));
}
/*
* if the method call is for the POST then the code below is executed which is
* executing the same code as the above if statment except for that it is a POST method instead
* of a GET method.
*/
else if (method.equalsIgnoreCase("POST")) {
String path = request.getPath();
String queryString = request.getQueryString();
toServer.println("POST " + path + " " + "HTTP/1.0");
toServer.println();
toServer.println(queryString);
String line;
line = fromServer.readLine();
int status = Integer.parseInt(line.substring(9, 12));
response.setStatus(status);
String descr = line.substring(13);
response.setDescription(descr);
do{
line = fromServer.readLine();
if (line != null && line.length() > 0) {
String name = line.substring(0, line.indexOf(": "));
String value = line.substring(line.indexOf(": ") + 2);
response.addHeader(name, value);
}
}
while (line != null && line.length() > 0);
StringBuilder sb = new StringBuilder();
do
{
line = fromServer.readLine();
if (line != null) {
sb.append(line).append("
");
}
} while (line != null);
String body = sb.toString();
response.setBody(body);
System.out.println("host: " + host);
System.out.println("port: " + String.valueOf(port));
}
/*Close the socket*/
bookSoc.close();
/*return the response*/
return response;
}
}
`
Here's the full code for the MyHttpClientApp.java file:
`
package com.example.bookstore;
import java.io.IOException;
import java.net.URI;
import java.net.URISyntaxException;
public class MyHttpClientApp {
public static void main(String[] args) {
String urlString = null;
URI uri;
MyHttpClient client;
MyHttpRequest request;
MyHttpResponse response;
try {
//==================================================================
// send GET request and print response
//==================================================================
urlString = "http://localhost:8888/bookstore/view_books.php";
uri = new URI(urlString);
client = new MyHttpClient();
request = new MyHttpRequest(uri);
request.setMethod("GET");
response = client.execute(request);
System.out.println("=============================================");
System.out.println(request);
System.out.println("=============================================");
System.out.println(response);
System.out.println("=============================================");
//==================================================================
// send POST request and print response
//==================================================================
urlString = "http://localhost:8888/bookstore/view_books.php";
uri = new URI(urlString);
client = new MyHttpClient();
request = new MyHttpRequest(uri);
request.setMethod("POST");
request.addParameter("title", "Fringe");
request.addParameter("firstName", "JJ");
request.addParameter("lastName", "Abrams");
request.addParameter("ISBN", "987654321349211");
request.addParameter("publisher", "Sci-fi");
request.addParameter("year", "2010");
request.addParameter("price", "19.99");
response = client.execute(request);
System.out.println("=============================================");
System.out.println(request);
System.out.println("=============================================");
System.out.println(response);
System.out.println("=============================================");
} catch (URISyntaxException e) {
String errorMessage = "Error parsing uri (" + urlString + "): " + e.getMessage();
System.out.println("MyHttpClientApp: " + errorMessage);
} catch (IOException e) {
String errorMessage = "Error downloading book list: " + e.getMessage();
System.out.println("MyHttpClientApp: " + errorMessage);
}
}
}
`
I'm well aware I may be giving a vauge question so please feel free to ask me to post some more code etc.
