Create小程序

我有时候喜欢直接用命令行创建、编译、执行java文件， 每次创建一个文件都要新建一个.java文件,然后再编辑.java文件加入类名，主函数……

这些流程我有点厌倦，于是就编写了一个超级简单的自动创建工具。下面贴出代码：

import java.awt.EventQueue;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.io.BufferedReader;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.util.HashMap;
import java.util.Map;

import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JOptionPane;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTextArea;
import javax.swing.JTextField;
import javax.swing.border.EmptyBorder;

public class Create extends JFrame {

private String classname;
private JPanel contentPane;
private JTextField textField;
private JLabel lblNewLabel_1;
private JButton btnNewButton_1;
private JButton btnNewButton_2;

/**
* Launch the application.
*/
public static void main(String[] args) {
EventQueue.invokeLater(new Runnable() {
public void run() {
try {
Create frame = new Create();
frame.setVisible(true);
} catch (Exception e) {
e.printStackTrace();
}
}
});
}

/**
* Create the frame.
*/
public Create() {
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setBounds(100, 100, 450, 300);
contentPane = new JPanel();
contentPane.setBorder(new EmptyBorder(5, 5, 5, 5));
setContentPane(contentPane);
contentPane.setLayout(null);

JLabel lblNewLabel = new JLabel("Class name:");
lblNewLabel.setBounds(49, 0, 93, 42);
contentPane.add(lblNewLabel);

textField = new JTextField();
textField.setBounds(170, 7, 212, 26);
contentPane.add(textField);
textField.setColumns(10);

lblNewLabel_1 = new JLabel("");
lblNewLabel_1.setBounds(49, 34, 333, 18);
contentPane.add(lblNewLabel_1);

JButton btnNewButton = new JButton("create");
btnNewButton.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
try {
classname = textField.getText();
if(classname.equals("")){
lblNewLabel_1.setText("请输入需要创建的类名！");
}else{
PrintWriter out = new PrintWriter(new File(classname+".java"));
String str = "class "+classname+"{\n\tpublic "+classname+"(){}\n\tpublic static void main(String[] args){\n\t// TODO Auto-generated method stub\n\n\t}\n}";
out.print(str);
out.close();
textField.setText("");
lblNewLabel_1.setText(classname+".java 创建成功");
}

} catch (FileNotFoundException e1) {
// TODO Auto-generated catch block
JOptionPane.showMessageDialog(getComponent(0), "创建失败");
}
}
});
btnNewButton.setBounds(275, 62, 107, 23);
contentPane.add(btnNewButton);

JScrollPane scrollPane = new JScrollPane();
scrollPane.setBounds(10, 95, 414, 156);
contentPane.add(scrollPane);

JTextArea textArea = new JTextArea();
scrollPane.setViewportView(textArea);

btnNewButton_1 = new JButton("javac编译");
btnNewButton_1.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
if(classname.equals("")){
lblNewLabel_1.setText("你还没有创建类文件！");
}else{
final Map<String, String> env = new HashMap<String, String>(System.getenv());
final String[] strings=mapToStringArray(env);
BufferedReader reader=null;
Process p;
String error="";
try {
p = Runtime.getRuntime().exec("cmd /c javac "+classname+".java",strings);
p.waitFor();
reader=new BufferedReader(new InputStreamReader(p.getErrorStream()));
String line;
while((line = reader.readLine()) != null)
{
error+=line+"\n";
}
} catch (Exception e1) {
// TODO Auto-generated catch block
System.out.println("编译程序出错");
}
if(error.equals("")){
textArea.setText("编译成功。");
}else{
textArea.setText(error);
}
}
}
});
btnNewButton_1.setBounds(38, 62, 93, 23);
contentPane.add(btnNewButton_1);

btnNewButton_2 = new JButton("java运行");
btnNewButton_2.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
final Map<String, String> env = new HashMap<String, String>(System.getenv());
final String[] strings=mapToStringArray(env);
BufferedReader reader=null;
Process p;
String error="";
String success="";
try {
p = Runtime.getRuntime().exec("cmd /c java "+classname,strings);
p.waitFor();
reader=new BufferedReader(new InputStreamReader(p.getErrorStream()));
String line;
while((line = reader.readLine()) != null)
{
error+=line+"\n";
}
if(error.equals("")){
reader=new BufferedReader(new InputStreamReader(p.getInputStream()));
while((line = reader.readLine()) != null)
{
success+=line+"\n";
}
}
} catch (Exception e1) {
// TODO Auto-generated catch block
System.out.println("运行程序出错");
}
if(error.equals("")){
textArea.setText("运行成功.\n"+success);
}else{
textArea.setText(error);
}
}
});
btnNewButton_2.setBounds(159, 62, 93, 23);
contentPane.add(btnNewButton_2);

this.setDefaultCloseOperation(DISPOSE_ON_CLOSE);
}
String[] mapToStringArray(Map<String, String> map) {
final String[] strings = new String[map.size()];
int i = 0;
for (Map.Entry<String, String> e : map.entrySet()) {
strings[i] = e.getKey() + '=' + e.getValue();
i++;
}
return strings;
}
}

View Code
程序运行图：

我们在Class name栏目输入我们需要创建的类名。



点击create按钮后就会在当前路径下生成Hello.java文件。文件内容是：

class Hello{
public Hello(){}
public static void main(String[] args){
// TODO Auto-generated method stub

}
}

然后我们在源文件中添加一行测试代码：System.out.println("hello");

class Hello{
public Hello(){}
public static void main(String[] args){
// TODO Auto-generated method stub
System.out.println("hello");
}
}

点击编译就能编译成功生成.class文件。



点击运行就能出现运行结果：



虽然很简单，但是还是挺实用的，以后每次就用它来创建我的类文件了，O(∩_∩)O！

当然也可以写几行脚本来完成这个小小的功能……