2
我还是java的新手,所以愚蠢的问题即将到来。我一直在使用一个简单的软件,使用JFrame
,PrintWriter
,File
和Scanner
来创建和读取文本文件,我用您输入的名称保存文件,然后将您输入的数据保存到JTextField
,问题是:只要你键入一个空格它不保存的文本空间到.txt
文件后:当字符串在java中有空格时,没有得到整个字符串
输入
等它
WriteToFile(textarea.getText(), name.getText());
// my function input text name
输出:
WAITFOR
但是,如果我输入文本手动这种方式:
WriteToFile("waitFor it", name.getText());
// my function input text name
输出:
等它
这使我认为,我的功能可能不会造成这一点,但我又是个菜鸟。
Main.java
package creator;
import java.awt.Font;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.KeyEvent;
import java.awt.event.KeyListener;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JScrollPane;
import javax.swing.JTextField;
import library.Database;
public class Main extends Database{
public static void main(String[] args) {
JFrame frame = new JFrame();
JButton button = new JButton("Erase");
JButton button2 = new JButton("Add");
JButton button3 = new JButton("Save to Database");
Font font = new Font("Courier", Font.BOLD, 12);
Font font2 = new Font("Courier", Font.BOLD, 14);
final JTextField name = new JTextField();
final JTextField editorPane = new JTextField();
final JTextField textarea = new JTextField();
final JScrollPane scroll = new JScrollPane (textarea,
JScrollPane.VERTICAL_SCROLLBAR_NEVER, JScrollPane.HORIZONTAL_SCROLLBAR_ALWAYS);
frame.setTitle("Array Creator");
frame.setSize(401, 250);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setLocationRelativeTo(null);
frame.setResizable(false);
frame.setLayout(null);
frame.add(button);
frame.add(name);
frame.add(button2);
frame.add(button3);
frame.add(editorPane);
frame.add(scroll);
button.setBounds(0, 200, 80, 22);
name.setBounds(82, 200, 80, 22);
button2.setBounds(164, 200, 80, 22);
button3.setBounds(246, 200, 148, 22);
editorPane.setBounds(100,175,200,18);
scroll.setBounds(50, 10, 300, 160);
textarea.setEditable(false);
button.setFont(font);
name.setFont(font);
button2.setFont(font);
button3.setFont(font);
editorPane.setFont(font);
textarea.setFont(font2);
textarea.setText("[");
frame.setVisible(true);
button.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent arg0) {
textarea.setText("[");
editorPane.setText("");
}
});
button2.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent arg0) {
textarea.setText(textarea.getText()+"["+editorPane.getText()+"],");
editorPane.setText("");
}
});
button3.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent arg0) {
String temp = textarea.getText();
temp = temp.substring(0, temp.length()-1);
textarea.setText(temp+"]");
editorPane.setText("");
WriteToFile(textarea.getText(), name.getText());
}
});
name.addKeyListener(new KeyListener() {
public void keyTyped(KeyEvent arg0) {
}
public void keyReleased(KeyEvent arg0) {
textarea.setText(readFile(name.getText()));
}
public void keyPressed(KeyEvent arg0) {
}
});
}
}
Database.java
package library;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.PrintWriter;
import java.io.UnsupportedEncodingException;
import java.util.Scanner;
public class Database {
public static String WriteToFile(String data, String name){
String output = "ERROR";
PrintWriter writer = null;
try {
writer = new PrintWriter(name+".txt", "UTF-8");
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (UnsupportedEncodingException e) {
e.printStackTrace();
}
writer.println(data);
writer.close();
File file = new File(name+".txt");
try {
@SuppressWarnings("resource")
Scanner sc = new Scanner(file);
output = sc.next();
} catch (FileNotFoundException e) {
e.printStackTrace();
}
return output;
}
public static String readFile(String name){
String output = "[";
File file = new File(name+".txt");
try {
@SuppressWarnings("resource")
Scanner sc = new Scanner(file);
output = sc.next();
} catch (FileNotFoundException e) {
}
return output;
}
}
月有人向我提供关于为什么这是一个解释?
相反'输出= sc.next();'用'输出= sc.nextLine() ;'。 – Satya
@Satya它的工作,感谢兄弟/ dudette +1 – Kyle
避免使用'null'布局,像素完美的布局是现代UI设计中的幻想。影响组件的个体大小的因素太多,其中没有一个可以控制。Swing旨在与布局经理一起工作,放弃这些将导致问题和问题的终结,您将花费越来越多的时间来尝试纠正 – MadProgrammer