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Commit dbd2164

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Merge pull request #72 from HarryDulaney/new-solutions
fix ex 31_02
2 parents f95e549 + b44b4ad commit dbd2164

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3 files changed

+67
-68
lines changed

3 files changed

+67
-68
lines changed

‎ch_31/exercise31_02/BmiDto.java

Lines changed: 2 additions & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -6,7 +6,8 @@
66
* This class is used to transfer data from the client to the server.
77
* For Exercise31_02, the client sends the weight and height for a person to the server.
88
*/
9-
public class BmiDto {
9+
public class BmiDto implements java.io.Serializable {
10+
private static final long serialVersionUID = 1L;
1011
private double weight;
1112
private double height;
1213

‎ch_31/exercise31_02/Exercise31_02Client.java

Lines changed: 21 additions & 35 deletions
Original file line numberDiff line numberDiff line change
@@ -11,55 +11,43 @@
1111
import java.io.DataInputStream;
1212
import java.io.DataOutputStream;
1313
import java.io.IOException;
14+
import java.io.ObjectOutputStream;
1415
import java.net.Socket;
16+
1517
public class Exercise31_02Client extends Application {
16-
DataOutputStream toServer = null;
18+
ObjectOutputStream toServer = null;
1719
DataInputStream fromServer = null;
20+
private TextField weightTextInput = new TextField();
21+
private TextField heightTextInput = new TextField();
1822

19-
// Text fields for BMI information
20-
private TextField tfWeight = new TextField();
21-
private TextField tfHeight = new TextField();
22-
23-
@Override // Override the start method in the Application class
23+
@Override
2424
public void start(Stage primaryStage) {
25-
// Main pane
2625
BorderPane pane = new BorderPane();
27-
28-
// Set text field alignment right
29-
tfWeight.setAlignment(Pos.BASELINE_RIGHT);
30-
tfHeight.setAlignment(Pos.BASELINE_RIGHT);
31-
32-
// Create button to send BMI info to server
26+
weightTextInput.setAlignment(Pos.BASELINE_RIGHT);
27+
heightTextInput.setAlignment(Pos.BASELINE_RIGHT);
3328
Button btSubmit = new Button("Submit");
34-
35-
// Pane to hold BMI information and submit button
3629
GridPane paneForBmiInfo = new GridPane();
3730
paneForBmiInfo.add(new Label("Weight in pounds"), 0, 0);
38-
paneForBmiInfo.add(tfWeight, 1, 0);
31+
paneForBmiInfo.add(weightTextInput, 1, 0);
3932
paneForBmiInfo.add(new Label("Height in inches"), 0, 1);
40-
paneForBmiInfo.add(tfHeight, 1, 1);
33+
paneForBmiInfo.add(heightTextInput, 1, 1);
4134
paneForBmiInfo.add(btSubmit, 2, 1);
42-
43-
// Text Area to display contents
4435
TextArea ta = new TextArea();
4536
pane.setTop(paneForBmiInfo);
4637
pane.setCenter(new ScrollPane(ta));
4738

48-
// Create a scene and place it in the stage
49-
Scene scene = new Scene(pane, 400, 200);
50-
primaryStage.setTitle("Exercise31_01Client"); // Set the stage title
51-
primaryStage.setScene(scene); // Place the scene in the stage
52-
primaryStage.show(); // Display the stage
39+
Scene scene = new Scene(pane, 560, 300);
40+
primaryStage.setTitle("Exercise31_02Client");
41+
primaryStage.setScene(scene);
42+
primaryStage.show();
5343

5444
btSubmit.setOnAction(e -> {
5545
try {
56-
// Get the weight and height from the text fields
57-
double weight = Double.parseDouble(tfWeight.getText().trim());
58-
double height = Double.parseDouble(tfHeight.getText().trim());
59-
46+
double weight = Double.parseDouble(weightTextInput.getText().trim());
47+
double height = Double.parseDouble(heightTextInput.getText().trim());
48+
BmiDto dto = new BmiDto(weight, height);
6049
// Send the BMI information to the server
61-
toServer.writeDouble(weight);
62-
toServer.writeDouble(height);
50+
toServer.writeObject(dto);
6351
toServer.flush();
6452

6553
// Get string from the server
@@ -69,8 +57,7 @@ public void start(Stage primaryStage) {
6957
ta.appendText("Weight: " + weight + '\n');
7058
ta.appendText("Height: " + height + '\n');
7159
ta.appendText(bmi + '\n');
72-
}
73-
catch (IOException ex) {
60+
} catch (IOException ex) {
7461
System.err.println(ex);
7562
}
7663
});
@@ -83,9 +70,8 @@ public void start(Stage primaryStage) {
8370
fromServer = new DataInputStream(socket.getInputStream());
8471

8572
// Create an output stream to send data to the server
86-
toServer = new DataOutputStream(socket.getOutputStream());
87-
}
88-
catch (IOException ex) {
73+
toServer = new ObjectOutputStream(socket.getOutputStream());
74+
} catch (IOException ex) {
8975
ta.appendText(ex.toString() + '\n');
9076
}
9177
}

‎ch_31/exercise31_02/Exercise31_02Server.java

Lines changed: 44 additions & 32 deletions
Original file line numberDiff line numberDiff line change
@@ -21,7 +21,7 @@ public class Exercise31_02Server extends Application {
2121
public void start(Stage primaryStage) {
2222
TextArea displayLogTextArea = new TextArea();
2323
Scene scene = new Scene(new ScrollPane(displayLogTextArea), 450, 200);
24-
primaryStage.setTitle("TicTacToeServer");
24+
primaryStage.setTitle("Exercise31_02Server");
2525
primaryStage.setScene(scene);
2626
primaryStage.show();
2727
new Thread(() -> {
@@ -32,50 +32,62 @@ public void start(Stage primaryStage) {
3232
+ new Date() + '\n'));
3333

3434
Socket socket = serverSocket.accept();
35-
DataInputStream inputFromClient = new DataInputStream(
35+
ObjectInputStream inputFromClient = new ObjectInputStream(
3636
socket.getInputStream());
3737
DataOutputStream outputToClient = new DataOutputStream(
3838
socket.getOutputStream());
3939

4040
while (true) {
41-
Date date = new Date();
42-
double weight = inputFromClient.readDouble();
43-
double height = inputFromClient.readDouble();
44-
double weightInKilograms = weight * KILOGRAMS_PER_POUND;
45-
double heightInMeters = height * METERS_PER_INCH;
46-
double bmi = calculateBmi(weightInKilograms, heightInMeters);
47-
StringBuilder bmiString = new StringBuilder("BMI is " +
48-
String.format("%.2f", bmi) + ". ");
41+
Object object = inputFromClient.readObject();
42+
String result = handleObjectInput(object);
43+
outputToClient.writeUTF(result);
4944

50-
if (bmi < 18.5) {
51-
bmiString.append("Underweight");
52-
} else if (bmi < 25) {
53-
bmiString.append("Normal");
54-
} else if (bmi < 30) {
55-
bmiString.append("Overweight");
56-
} else {
57-
bmiString.append("Obese");
58-
}
59-
outputToClient.writeUTF(bmiString.toString());
60-
61-
Platform.runLater(() -> {
62-
displayLogTextArea.appendText("Connected to a client at " + date + '\n');
63-
displayLogTextArea.appendText("Weight: " + weight + '\n');
64-
displayLogTextArea.appendText("Height: " + height + '\n');
65-
displayLogTextArea.appendText(bmiString.toString() + '\n');
66-
});
45+
log(result, new Date(), displayLogTextArea);
6746
}
68-
} catch (IOException ex) {
69-
ex.printStackTrace();
47+
} catch (IOException | ClassNotFoundExceptionex) {
48+
System.out.println("Sever Error: " + ex.getMessage());
7049
}
7150
}).start();
7251
}
7352

74-
private double calculateBmi(double weight, double height) {
75-
double weightInKilograms = weight * KILOGRAMS_PER_POUND;
76-
double heightInMeters = height * METERS_PER_INCH;
53+
private String handleObjectInput(Object object) throws IOException, ClassNotFoundException {
54+
BmiDto dto = (BmiDto) object;
55+
double bmi = calculateBmi(dto);
56+
return "BMI is " +
57+
String.format("%.2f", bmi) +
58+
". " +
59+
getBmiString(bmi) +
60+
". ";
61+
}
62+
63+
private double calculateBmi(BmiDto dto) {
64+
double weightInKilograms = dto.getWeight() * KILOGRAMS_PER_POUND;
65+
double heightInMeters = dto.getHeight() * METERS_PER_INCH;
7766
return weightInKilograms /
7867
(heightInMeters * heightInMeters);
7968
}
8069

70+
private String getBmiString(double bmi) {
71+
if (bmi < 18.5) {
72+
return "Underweight";
73+
}
74+
75+
if (bmi < 25) {
76+
return "Normal";
77+
}
78+
79+
if (bmi < 30) {
80+
return "Overweight";
81+
}
82+
return "Obese";
83+
}
84+
85+
private void log(String result,
86+
Date date,
87+
TextArea displayLogTextArea) {
88+
Platform.runLater(() -> {
89+
displayLogTextArea.appendText("Connected to a client at " + date + '\n');
90+
displayLogTextArea.appendText(result + '\n');
91+
});
92+
}
8193
}

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