发布于2021-07-18 20:34 阅读(590) 评论(0) 点赞(24) 收藏(2)
import java.io.*;
public class Keyboard {
public static void main(String[] args) throws IOException {
InputStreamReader isr = new InputStreamReader(System.in);
BufferedReader br = new BufferedReader(isr);
FileOutputStream fos = new FileOutputStream("myfile.txt");
OutputStreamWriter osw = new OutputStreamWriter(fos);
BufferedWriter bw = new BufferedWriter(osw);
System.out.println("请输入字符串(按Ctrl+Z结束):");
String str = null;
while ((str = br.readLine()) != null) {
bw.write(str);
bw.write("\n");
}
br.close();
bw.close();
System.out.println("创建文件完毕!");
}
}
运行结果为
import java.io.*;
public class TextFileCopy {
public static void main(String[] args) {
try {
FileReader input = new FileReader(args[0]);
BufferedReader br = new BufferedReader(input);
FileWriter output = new FileWriter(args[1]);
BufferedWriter bw = new BufferedWriter(output);
String str = br.readLine();
while (str != null) {
bw.write(str);
bw.newLine();
str = br.readLine();
}
bw.flush();
bw.close();
br.close();
} catch (IOException e) {
e.printStackTrace();
} catch (NullPointerException e) {
e.printStackTrace();
} catch (ArrayIndexOutOfBoundsException e) {
e.printStackTrace();
}
System.out.println("文件复制完毕!");
}
}
此处问题有些多,捣鼓了我快一个小时,总结的一些小东西
1.如何给 main 函数中的 args[ ] 字符串数组赋值
这种情况就是你没有给字符串数组赋值
我转载别人的,一搜就有,一眼就能看懂,根据软件不同
idea的
https://blog.csdn.net/David_jiahuan/article/details/90780518
eclipse的
https://blog.csdn.net/wangyin970774934/article/details/52252669
2.系统提示找不到指定的文件
这个时候不能简单的输入你所创建的 类名.java 了
要输入根路径,即你所创建的文件在的具体位置
最简单的方式就是你将你所创建的 .java 文件直接复制某个盘上
此时的根路径就是C:\xxxx(你创建类的名字).java
你也可以直接找到你 .java 的路径,然后直接复制一大串
但是如果你的根路径中有
由此符号的,他会报错并在此处停下。
最后运行结果为
然后你找到你的 .txt 打开后即为
import java.awt.Button;
import java.awt.Dialog;
import java.awt.FileDialog;
import java.awt.Frame;
import java.awt.Label;
import java.awt.Menu;
import java.awt.MenuBar;
import java.awt.MenuItem;
import java.awt.TextArea;
import java.awt.TextField;
import java.awt.Toolkit;
import java.awt.datatransfer.Clipboard;
import java.awt.datatransfer.DataFlavor;
import java.awt.datatransfer.StringSelection;
import java.awt.datatransfer.Transferable;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;
class MyMenuBar extends MenuBar {
private static final long serialVersionUID = 1L;
public MyMenuBar(Frame parent) {
parent.setMenuBar(this);
}
public void addMenus(String[] menus) {
for (int i = 0; i < menus.length; i++)
add(new Menu(menus[i]));
}
public void addMenuItems(int menuNumber, String[] items) {
for (int i = 0; i < items.length; i++) {
if (items[i] != null)
getMenu(menuNumber).add(new MenuItem(items[i]));
else
getMenu(menuNumber).addSeparator();
}
}
public void addActionListener(ActionListener al) {
for (int i = 0; i < getMenuCount(); i++)
for (int j = 0; j < getMenu(i).getItemCount(); j++)
getMenu(i).getItem(j).addActionListener(al);
}
}
class MyFile {
private FileDialog fDlg;
public MyFile(Frame parent) {
fDlg = new FileDialog(parent, "", FileDialog.LOAD);
}
private String getPath() {
return fDlg.getDirectory() + "\\" + fDlg.getFile();
}
public String getData() throws IOException {
fDlg.setTitle("打开");
fDlg.setMode(FileDialog.LOAD);
fDlg.setVisible(true);
BufferedReader br = new BufferedReader(new FileReader(getPath()));
StringBuffer sb = new StringBuffer();
String aline;
while ((aline = br.readLine()) != null)
sb.append(aline + '\n');
br.close();
return sb.toString();
}
public void setData(String data) throws IOException {
fDlg.setTitle("保存");
fDlg.setMode(FileDialog.SAVE);
fDlg.setVisible(true);
BufferedWriter bw = new BufferedWriter(new FileWriter(getPath()));
bw.write(data);
bw.close();
}
}
class MyClipboard {
private Clipboard cb;
public MyClipboard() {
cb = Toolkit.getDefaultToolkit().getSystemClipboard();
}
public void setData(String data) {
cb.setContents(new StringSelection(data), null);
}
public String getData() {
Transferable content = cb.getContents(null);
try {
return (String) content.getTransferData(DataFlavor.stringFlavor);
} catch (Exception ue) {
}
return null;
}
}
class MyFindDialog extends Dialog implements ActionListener {
private static final long serialVersionUID = 1L;
private Label lFind = new Label("查找字符串:");
private Label lReplace = new Label("替换字符串:");
private TextField tFind = new TextField(10);
private TextField tReplace = new TextField(10);
private Button bFind = new Button("查找");
private Button bReplace = new Button("替换");
private TextArea ta;
public MyFindDialog(Frame owner, TextArea ta) {
super(owner, "查找", false);
this.ta = ta;
setLayout(null);
lFind.setBounds(10, 30, 80, 20);
lReplace.setBounds(10, 70, 80, 20);
tFind.setBounds(90, 30, 90, 20);
tReplace.setBounds(90, 70, 90, 20);
bFind.setBounds(190, 30, 80, 20);
bReplace.setBounds(190, 70, 80, 20);
add(lFind);
add(tFind);
add(bFind);
add(lReplace);
add(tReplace);
add(bReplace);
setResizable(false);
bFind.addActionListener(this);
bReplace.addActionListener(this);
addWindowListener(new WindowAdapter() {
public void windowClosing(WindowEvent e) {
MyFindDialog.this.dispose();
}
});
}
public void showFind() {
setTitle("查找");
setSize(280, 60);
setVisible(true);
}
public void showReplace() {
setTitle("查找替换");
setSize(280, 110);
setVisible(true);
}
private void find() {
String text = ta.getText();
String str = tFind.getText();
int end = text.length();
int len = str.length();
int start = ta.getSelectionEnd();
if (start == end)
start = 0;
for (; start <= end - len; start++) {
if (text.substring(start, start + len).equals(str)) {
ta.setSelectionStart(start);
ta.setSelectionEnd(start + len);
return;
}
}
ta.setSelectionStart(end);
ta.setSelectionEnd(end);
}
private void replace() {
String str = tReplace.getText();
if (ta.getSelectedText().equals(tFind.getText()))
ta.replaceRange(str, ta.getSelectionStart(), ta.getSelectionEnd());
else
find();
}
public void actionPerformed(ActionEvent e) {
if (e.getSource() == bFind)
find();
else if (e.getSource() == bReplace)
replace();
}
}
public class MyMemo extends Frame implements ActionListener {
private static final long serialVersionUID = 1L;
private TextArea editor = new TextArea();
private MyFile mf = new MyFile(this);
private MyClipboard cb = new MyClipboard();
private MyFindDialog findDlg = new MyFindDialog(this, editor);
public MyMemo(String title) {
super(title);
MyMenuBar mb = new MyMenuBar(this);
mb.addMenus(new String[] { "文件", "编辑", "查找", "帮助" });
mb.addMenuItems(0, new String[] { "新建", "打开", "保存", null, "退出" });
mb.addMenuItems(1, new String[] { "剪切", "复制", "粘贴", "清除", null, "全选" });
mb.addMenuItems(2, new String[] { "查找", null, "查找替换" });
mb.addMenuItems(3, new String[] { "我的记事本信息" });
add(editor);
mb.addActionListener(this);
addWindowListener(new WindowAdapter() {
public void windowClosing(WindowEvent e) {
MyMemo.this.dispose();
}
});
}
public void actionPerformed(ActionEvent e) {
String selected = e.getActionCommand();
if (selected.equals("新建"))
editor.setText("");
else if (selected.equals("打开")) {
try {
editor.setText(mf.getData());
} catch (IOException ie) {
}
} else if (selected.equals("保存")) {
try {
mf.setData(editor.getText());
} catch (IOException ie) {
}
} else if (selected.equals("退出")) {
dispose();
} else if (selected.equals("剪贴")) {
cb.setData(editor.getSelectedText());
editor.replaceRange("", editor.getSelectionStart(), editor.getSelectionEnd());
} else if (selected.equals("复制")) {
cb.setData(editor.getSelectedText());
} else if (selected.equals("粘贴")) {
String str = cb.getData();
editor.replaceRange(str, editor.getSelectionStart(), editor.getSelectionEnd());
} else if (selected.equals("清除")) {
editor.replaceRange("", editor.getSelectionStart(), editor.getSelectionEnd());
} else if (selected.equals("全选")) {
editor.setSelectionStart(0);
editor.setSelectionEnd(editor.getText().length());
} else if (selected.equals("查找")) {
findDlg.showFind();
} else if (selected.equals("查找替换")) {
findDlg.showReplace();
}
}
public static void main(String[] args) {
MyMemo memo = new MyMemo("我的记事本");
memo.setSize(300, 300);
memo.setVisible(true);
}
}
运行结果为
原文链接:https://blog.csdn.net/basinle/article/details/117871151
作者:风雨雷电
链接:http://www.pythonpdf.com/blog/article/97/7d2a25daaaab8d2ccaae/
来源:编程知识网
任何形式的转载都请注明出处,如有侵权 一经发现 必将追究其法律责任
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