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+"{
	public "+classname+"(){}
	public static void main(String[] args){
	// TODO Auto-generated method stub

	}
}";
                        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+"
";
                        }
                    } 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+"
";
                    }
                    if(error.equals("")){
                        reader=new BufferedReader(new InputStreamReader(p.getInputStream()));
                        while((line = reader.readLine()) != null) 
                        { 
                            success+=line+"
";
                        }
                    }
                } 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.
"+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;
    }
}

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……