java - 如何将控制台输出重定向到 GUI 表单？

Question

我在学校上 Java 编程课，我们一直在类里面做一个项目 - 处理控制台应用程序。在接下来的一周，我们将继续致力于使用 JAVA 创建 GUI 应用程序，我对如何处理我的一个项目有了一个想法。

我想将控制台输出重定向到 GUI 内的文本区域。但我不知道这是否可能，或者如何去做。是否可能，如果可以，有人可以帮助我。我正在尝试设计我的表格，使其看起来像收银机(收据在收银机的一侧)。在这种情况下，收据将是重定向的控制台输出。

如有任何帮助，我们将不胜感激。

这是我的源代码:

package autoshop_invoice;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.text.NumberFormat;
import java.util.logging.Level;
import java.util.logging.Logger;

public class AutoShop_Invoice
  {

        public static void total_sales() throws IOException
      {
        String text = "";
        String part_number = "";
        int num_items = 0;
        double price = 0.0;
        double tax = 0.0;
        double total_sale = 0.0;

        //Prompt user for part number and store value in variable part_number.
        System.out.println("Enter Part Number then hit enter.");
        BufferedReader in = new BufferedReader(new InputStreamReader(System.in));
        try
          {
            part_number = in.readLine();
          } catch (IOException ex)
          {
            Logger.getLogger(AutoShop_Invoice.class.getName()).log(Level.SEVERE, null,     ex);
          }

        //Prompt user to enter number of items sold and store value in variable num_items.
        System.out.println("Enter Number of Items sold then hit enter.");
        in = new BufferedReader(new InputStreamReader(System.in));
        text = in.readLine();
        num_items = Integer.parseInt(text);

        //Prompt user to enter Price per Item and store value in variable num_items.
        System.out.println("Enter Price per Item then hit enter.");
        in = new BufferedReader(new InputStreamReader(System.in));
        text = in.readLine();
        price = Double.parseDouble(text);

        //Display the total sale WITH tax calculated.
        total_sale = num_items * price;
        tax = total_sale * .06;
        total_sale = total_sale + tax;
        //DecimalFormat df = new DecimalFormat("#.##"); 
        NumberFormat nf = NumberFormat.getCurrencyInstance();  //Get the current system locale currency
        System.out.println();
        System.out.println("***********************************");
        System.out.print("Part Number: " + part_number + " ");  //Display the Part Number being sold
        System.out.println("QTY: " + num_items);  //Display the quantity of items sold
        System.out.println("Sub-Total is: " + nf.format(total_sale));   //Display sub-total rounded to 2 decimal points
        System.out.println("MD Sales Tax due (6%): " + nf.format(tax));  //Display the calculated sales tax
        //Display grand-total rounded to 2 decimal points and formatted with the locale currency
        //System.out.println("Grand-Total sales is: " + df.format(nf.format(total_sale + tax)));
        System.out.println("Grand-Total sales is: " + nf.format(total_sale + tax)); 
        System.out.println("***********************************");
      }

    /**
     * @param args the command line arguments
     */
    public static void main(String[] args) throws IOException
      {
        // TODO code application logic here
        total_sales();
      }
  }

Answer 1

自己写OutputStream添加任何写入文本区域的字节的实现。然后将其包装在 PrintStream 中并将其传递给 System.setOut() :

System.setOut(new PrintStream(myTextAreaOutputStream));