项目历程—可视化文件系统

目标：实现C盘打开后，可以点开文件或者目录，并且新的界面依旧可以打开文件或目录，可以重复使用

1.实现一个界面

package People;import javax.swing.*;
import java.awt.*;
import java.io.File;public class FileSystem {static String rootPath="C:\\";public  void showUI(){JFrame jf=new JFrame();jf.setTitle("文件系统");jf.setSize(800,600);jf.setLocation(200,600);jf.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);File file=new File(rootPath);File[] files=file.listFiles();int column=4;int row=(files.length/column)+1;GridLayout gl=new GridLayout(row,column,10,10);jf.setLayout(gl);jf.setVisible(true);}
}

2.向该界面传入C盘文件，先把所有名字分类成目录和文件，存储进动态数组，再通过动态数组传入按钮，并给按钮接入监听器

package People;import javax.swing.*;
import java.awt.*;
import java.io.File;
import java.util.ArrayList;public class FileSystem {static String rootPath="C:\\";OPFileListener fol=new OPFileListener();public  void showUI(){JFrame jf=new JFrame();jf.setTitle("文件系统");jf.setSize(800,600);jf.setLocation(200,600);jf.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);File file=new File(rootPath);File[] files=file.listFiles();int column=4;int row=(files.length/column)+1;GridLayout gl=new GridLayout(row,column,10,10);jf.setLayout(gl);ArrayList<String> dirName=new ArrayList<>();ArrayList<String> fileName=new ArrayList<>();for(int i=0;i< files.length;i++){if(!files[i].isHidden()){if(files[i].isDirectory()){dirName.add(files[i].getName());}}}for(int i=0;i< files.length;i++){if(!files[i].isHidden()){if(files[i].isFile()){fileName.add(files[i].getName());}}}
//名字已经传入，接下来传入按钮for(int i=0;i<dirName.size();i++){JButton btn=new JButton(dirName.get(i));btn.addActionListener(fol);}for(int i=0;i<fileName.size();i++){JButton btn=new JButton(fileName.get(i));btn.addActionListener(fol);}jf.setVisible(true);}
}

package People;import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;public class OPFileListener implements ActionListener {@Overridepublic void actionPerformed(ActionEvent e) {}
}

3.实现点击进入后遇见与一开始的界面相同的界面，即目录和文件的同布局界面，因此将第一步的方法复制粘贴到监听器中

package People;import javax.swing.*;
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.io.File;
import java.util.ArrayList;public class OPFileListener implements ActionListener {@Overridepublic void actionPerformed(ActionEvent e) {}public  void showNewUI(){JFrame jf=new JFrame();jf.setTitle("文件系统");jf.setSize(800,600);jf.setLocation(200,600);jf.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);File file=new File(rootPath);File[] files=file.listFiles();int column=4;int row=(files.length/column)+1;GridLayout gl=new GridLayout(row,column,10,10);jf.setLayout(gl);ArrayList<String> dirName=new ArrayList<>();ArrayList<String> fileName=new ArrayList<>();for(int i=0;i< files.length;i++){if(!files[i].isHidden()){if(files[i].isDirectory()){dirName.add(files[i].getName());}}}for(int i=0;i< files.length;i++){if(!files[i].isHidden()){if(files[i].isFile()){fileName.add(files[i].getName());}}}
//名字已经传入，接下来传入按钮for(int i=0;i<dirName.size();i++){JButton btn=new JButton(dirName.get(i));btn.addActionListener(fol);}for(int i=0;i<fileName.size();i++){JButton btn=new JButton(fileName.get(i));btn.addActionListener(fol);}jf.setVisible(true);}
}

4.修改报错点，将fol改为this，去除File file=new file(rootPath)，在方法中传入file参数

package People;import javax.swing.*;
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.io.File;
import java.util.ArrayList;public class OPFileListener implements ActionListener {@Overridepublic void actionPerformed(ActionEvent e) {String dirName=e.getActionCommand();File file=new File(dirName);showNewUI(file);}public  void showNewUI(File file){JFrame jf=new JFrame();jf.setTitle("文件系统");jf.setSize(800,600);jf.setLocation(200,600);jf.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);File[] files=file.listFiles();int column=4;int row=(files.length/column)+1;GridLayout gl=new GridLayout(row,column,10,10);jf.setLayout(gl);ArrayList<String> dirName=new ArrayList<>();ArrayList<String> fileName=new ArrayList<>();for(int i=0;i< files.length;i++){if(!files[i].isHidden()){if(files[i].isDirectory()){dirName.add(files[i].getName());}}}for(int i=0;i< files.length;i++){if(!files[i].isHidden()){if(files[i].isFile()){fileName.add(files[i].getName());}}}
//名字已经传入，接下来传入按钮for(int i=0;i<dirName.size();i++){JButton btn=new JButton(dirName.get(i));btn.addActionListener(this);}for(int i=0;i<fileName.size();i++){JButton btn=new JButton(fileName.get(i));btn.addActionListener(this);}jf.setVisible(true);}
}

5.结合在FileSystem中File file=new File(rootPath)可得到C盘文件可知，需要在一个()中传入该文件目录的路径，才能进入该目录。因此返回到FIleSystem类的向目录传入名字的过程中去，将一个ActionCommand类的完整路径传入按钮

package People;import javax.swing.*;
import java.awt.*;
import java.io.File;
import java.util.ArrayList;public class FileSystem {static String rootPath="C:\\";OPFileListener fol=new OPFileListener();public  void showUI(){JFrame jf=new JFrame();jf.setTitle("文件系统");jf.setSize(800,600);jf.setLocation(200,600);jf.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);File file=new File(rootPath);File[] files=file.listFiles();int column=4;int row=(files.length/column)+1;GridLayout gl=new GridLayout(row,column,10,10);jf.setLayout(gl);ArrayList<String> dirName=new ArrayList<>();ArrayList<String> fileName=new ArrayList<>();for(int i=0;i< files.length;i++){if(!files[i].isHidden()){if(files[i].isDirectory()){dirName.add(files[i].getName());}}}for(int i=0;i< files.length;i++){if(!files[i].isHidden()){if(files[i].isFile()){fileName.add(files[i].getName());}}}
//名字已经传入，接下来传入按钮for(int i=0;i<dirName.size();i++){JButton btn=new JButton(dirName.get(i));btn.setActionCommand(rootPath+"\\"+dirName.get(i));btn.addActionListener(fol);}for(int i=0;i<fileName.size();i++){JButton btn=new JButton(fileName.get(i));btn.addActionListener(fol);}jf.setVisible(true);}
}

6.在监听器中也向目录按钮传入该文件的完整路径，点击进去后得到该文件的集体内容

package People;import javax.swing.*;
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.io.File;
import java.util.ArrayList;public class OPFileListener implements ActionListener {@Overridepublic void actionPerformed(ActionEvent e) {String dirName=e.getActionCommand();File file=new File(dirName);showNewUI(file);}public  void showNewUI(File file){JFrame jf=new JFrame();jf.setTitle("文件系统");jf.setSize(800,600);jf.setLocation(200,600);jf.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);File[] files=file.listFiles();int column=4;int row=(files.length/column)+1;GridLayout gl=new GridLayout(row,column,10,10);jf.setLayout(gl);ArrayList<String> dirName=new ArrayList<>();ArrayList<String> fileName=new ArrayList<>();for(int i=0;i< files.length;i++){if(!files[i].isHidden()){if(files[i].isDirectory()){dirName.add(files[i].getName());}}}for(int i=0;i< files.length;i++){if(!files[i].isHidden()){if(files[i].isFile()){fileName.add(files[i].getName());}}}
//名字已经传入，接下来传入按钮for(int i=0;i<dirName.size();i++){JButton btn=new JButton(dirName.get(i));btn.setActionCommand(file.getAbsolutePath()+"\\"+dirName.get(i));btn.addActionListener(this);}for(int i=0;i<fileName.size();i++){JButton btn=new JButton(fileName.get(i));btn.addActionListener(this);}jf.setVisible(true);}
}

7.向面板当中添加按钮。.创建主函数调用方法，至此全部完成，简单的文件点击系统实现

package People;import javax.swing.*;
import java.awt.*;
import java.io.File;
import java.util.ArrayList;public class FileSystem {static String rootPath="C:\\";OPFileListener fol=new OPFileListener();public  void showUI(){JFrame jf=new JFrame();jf.setTitle("文件系统");jf.setSize(800,600);jf.setLocation(200,200);jf.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);File file=new File(rootPath);File[] files=file.listFiles();int column=4;int row=(files.length/column)+1;GridLayout gl=new GridLayout(row,column,10,10);jf.setLayout(gl);ArrayList<String> dirName=new ArrayList<>();ArrayList<String> fileName=new ArrayList<>();for(int i=0;i< files.length;i++){if(!files[i].isHidden()){if(files[i].isDirectory()){dirName.add(files[i].getName());}}}for(int i=0;i< files.length;i++){if(!files[i].isHidden()){if(files[i].isFile()){fileName.add(files[i].getName());}}}
//名字已经传入，接下来传入按钮for(int i=0;i<dirName.size();i++){JButton btn=new JButton(dirName.get(i));btn.setActionCommand(rootPath+"\\"+dirName.get(i));btn.addActionListener(fol);jf.add(btn);}for(int i=0;i<fileName.size();i++){JButton btn=new JButton(fileName.get(i));btn.addActionListener(fol);jf.add(btn);}jf.setVisible(true);}public static void main(String[] args) {FileSystem fileSystem=new FileSystem();fileSystem.showUI();}
}

package People;import javax.swing.*;
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.io.File;
import java.util.ArrayList;public class OPFileListener implements ActionListener {@Overridepublic void actionPerformed(ActionEvent e) {String dirName=e.getActionCommand();File file=new File(dirName);showNewUI(file);}public  void showNewUI(File file){JFrame jf=new JFrame();jf.setTitle("文件系统");jf.setSize(800,600);jf.setLocation(200,200);jf.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);File[] files=file.listFiles();int column=4;int row=(files.length/column)+1;GridLayout gl=new GridLayout(row,column,10,10);jf.setLayout(gl);ArrayList<String> dirName=new ArrayList<>();ArrayList<String> fileName=new ArrayList<>();for(int i=0;i< files.length;i++){if(!files[i].isHidden()){if(files[i].isDirectory()){dirName.add(files[i].getName());}}}for(int i=0;i< files.length;i++){if(!files[i].isHidden()){if(files[i].isFile()){fileName.add(files[i].getName());}}}
//名字已经传入，接下来传入按钮for(int i=0;i<dirName.size();i++){JButton btn=new JButton(dirName.get(i));btn.setActionCommand(file.getAbsolutePath()+"\\"+dirName.get(i));btn.addActionListener(this);jf.add(btn);}for(int i=0;i<fileName.size();i++){JButton btn=new JButton(fileName.get(i));btn.addActionListener(this);jf.add(btn);}jf.setVisible(true);}
}