Java实现简易的文本编辑器

时间：2023-01-26 19:36:54

需求分析：

  1. 获得文本名称
  2. 实现尾部追加功能
  3. 实现覆盖式添加数据
  4. 删除数据
  5. 获取光标位置
  6. 在特定光标位置处添加数据
  7. 查找特定字符串在主串中第一次出现的位置

  8. 统计文本文件内出现的数字，汉字，英文字母，特殊字符的个数，及总的字符个数

    开发环境：
    windows7 + Eclipse luna + WindowsBuilder插件

代码实现：

import java.awt.EventQueue;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.File;
import java.io.FileOutputStream;
import java.io.FileReader;
import java.io.IOException;
import java.io.OutputStreamWriter;

import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JTextArea;
import javax.swing.border.EmptyBorder;
import javax.swing.event.CaretEvent;
import javax.swing.event.CaretListener;

public class Test extends JFrame {

private JPanel contentPane;
private static File file = null;
static int CursorPosition=-1;

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

/**
 * Create the frame.
 */
public Test() {
        file = new File("F://test.txt");
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        setBounds(100, 100, 720, 480);
        contentPane = new JPanel();
        contentPane.setBorder(new EmptyBorder(5, 5, 5, 5));
        setContentPane(contentPane);
        contentPane.setLayout(null);

        JTextArea taShow = new JTextArea();
        taShow.setLineWrap(true);
        taShow.setBounds(21, 41, 400, 359);


        JLabel label = new JLabel("\u6587\u672C\u9884\u89C8\u533A\uFF1A");
        label.setBounds(21, 16, 89, 15);
        contentPane.add(label);

        JTextArea taEdit = new JTextArea();
        taEdit.setLineWrap(true);
        taEdit.setBounds(449, 41, 233, 131);
        contentPane.add(taEdit);


        taShow.addCaretListener(new CaretListener() {

@Override
public void caretUpdate(CaretEvent e) {
// TODO Auto-generated method stub
                StringBuffer sb = new StringBuffer();
                String length = "";

                String fileTitle;
                String fileContent;
try {
                    BufferedReader reader = new BufferedReader(new FileReader(
"F://test.txt"));
while ((length = reader.readLine()) != null) {
                        sb.append(length);
                    }
                    fileContent = sb.toString();
                    taShow.setText("您打开的文件的内容是：" + fileContent);
                    CursorPosition = e.getDot();
                } catch (Exception e1) {
// TODO Auto-generated catch block
                    e1.printStackTrace();
                }

            }

        });
        contentPane.add(taShow);

        JButton btnGetName = new JButton("\u6587\u6863\u540D\u79F0");
        btnGetName.setBounds(449, 211, 93, 23);
        btnGetName.addActionListener(new ActionListener() {

@Override
public void actionPerformed(ActionEvent e) {
// TODO Auto-generated method stub
                StringBuffer sb = new StringBuffer();
                String length = "";

                String fileTitle;
                String fileContent;
try {
                    BufferedReader reader = new BufferedReader(new FileReader(
"F://test.txt"));
while ((length = reader.readLine()) != null) {
                        sb.append(length);
                    }
                    fileContent = sb.toString();
                    fileTitle = file.getName().toString();
                    taEdit.setText("您打开的文件的名称是：" + fileTitle);
                    taShow.setText("您打开的文件的内容是：" + fileContent);
                } catch (Exception e1) {
// TODO Auto-generated catch block
                    e1.printStackTrace();
                }
            }
        });
        contentPane.add(btnGetName);

        JButton btnAppend = new JButton("\u8FFD\u52A0");
        btnAppend.setBounds(449, 261, 93, 23);
        btnAppend.addActionListener(new ActionListener() {

@Override
public void actionPerformed(ActionEvent e) {
// TODO Auto-generated method stub
                String temp = taEdit.getText().toString();
                method1("F://test.txt", temp);
                StringBuffer sb = new StringBuffer();
                String length = "";

                String fileTitle;
                String fileContent;
try {
                    BufferedReader reader = new BufferedReader(new FileReader(
"F://test.txt"));
while ((length = reader.readLine()) != null) {
                        sb.append(length);
                    }
                    fileContent = sb.toString();
                    fileTitle = file.getName().toString();
                    taEdit.setText("您打开的文件的名称是：" + fileTitle);
                    taShow.setText("您打开的文件的内容是：" + fileContent);
                } catch (Exception e1) {
// TODO Auto-generated catch block
                    e1.printStackTrace();
                }
            }
        });
        contentPane.add(btnAppend);

        JButton btnOverride = new JButton("\u8986\u76D6");
        btnOverride.addActionListener(new ActionListener() {

@Override
public void actionPerformed(ActionEvent e) {
// TODO Auto-generated method stub
                BufferedWriter out = null;
try {
                    out = new BufferedWriter(new OutputStreamWriter(
new FileOutputStream(file)));
                    out.write(taEdit.getText().toString());
                } catch (Exception ex) {
                    ex.printStackTrace();
                } finally {
try {
if (out != null) {
                            out.close();
                        }
                    } catch (IOException le) {
                        le.printStackTrace();
                    }
                }

                StringBuffer sb = new StringBuffer();
                String length = "";

                String fileTitle;
                String fileContent;
try {
                    BufferedReader reader = new BufferedReader(new FileReader(
"F://test.txt"));
while ((length = reader.readLine()) != null) {
                        sb.append(length);
                    }
                    fileContent = sb.toString();
                    fileTitle = file.getName().toString();
                    taEdit.setText("您打开的文件的名称是：" + fileTitle);
                    taShow.setText("您打开的文件的内容是：" + fileContent);
                } catch (Exception e1) {
// TODO Auto-generated catch block
                    e1.printStackTrace();
                }
            }

        });
        btnOverride.setBounds(449, 308, 93, 23);

        contentPane.add(btnOverride);

        JButton btnSearch = new JButton("\u67E5\u627E");
        btnSearch.setBounds(449, 357, 93, 23);
        btnSearch.addActionListener(new ActionListener() {

@Override
public void actionPerformed(ActionEvent e) {
// TODO Auto-generated method stub
                StringBuffer sb = new StringBuffer();
                String length = "";

                String fileTitle;
                String fileContent;
try {
                    BufferedReader reader = new BufferedReader(new FileReader(
"F://test.txt"));
while ((length = reader.readLine()) != null) {
                        sb.append(length);
                    }
                    fileContent = sb.toString();
                    taShow.setText("您打开的文件的内容是：" + fileContent);
                    String p = taEdit.getText().toString().trim();
                    taShow.setText(fileContent+"\n\n"+"您查找的字符串第一次出现的位置是："+fileContent.indexOf(p));

                } catch (Exception e1) {
// TODO Auto-generated catch block
                    e1.printStackTrace();
                }
            }

        });



        contentPane.add(btnSearch);

        JButton btnPosition = new JButton("\u5149\u6807\u4F4D\u7F6E");
        btnPosition.setBounds(589, 211, 93, 23);
        btnPosition.enable(false);
        contentPane.add(btnPosition);

        JButton btnInsert = new JButton("\u5B9A\u70B9\u63D2\u5165");
        btnInsert.setBounds(589, 261, 93, 23);
        btnInsert.addActionListener(new ActionListener(){

@Override
public void actionPerformed(ActionEvent e) {
// TODO Auto-generated method stub
                StringBuffer sb = new StringBuffer();
                String length = "";

                String fileTitle;
                String fileContent;
try {
                    BufferedReader reader = new BufferedReader(new FileReader(
"F://test.txt"));
while ((length = reader.readLine()) != null) {
                        sb.append(length);
                    }
                    String temp=taEdit.getText().toString();
                    sb.insert(CursorPosition, temp);
                    method1("F://test.txt", sb.toString());
                    taShow.setText(sb.toString());
                    taEdit.setText("定点的数据插入成功执行！");
                }catch(Exception ev){
                    ev.printStackTrace();
                }
            }

        });
        contentPane.add(btnInsert);

        JButton btnDelete = new JButton("\u5220\u9664");
        btnDelete.setBounds(589, 308, 93, 23);
        btnDelete.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
// TODO Auto-generated method stub
                BufferedWriter out = null;
try {
                    out = new BufferedWriter(new OutputStreamWriter(
new FileOutputStream(file)));
                    out.write("");
                    taShow.setText("删除操作已完成，请到相应路径下查看！");
                } catch (Exception ex) {
                    ex.printStackTrace();
                } finally {
try {
if (out != null) {
                            out.close();
                        }
                    } catch (IOException le) {
                        le.printStackTrace();
                    }
                }
            }
        });
        contentPane.add(btnDelete);

        JButton btnTotal = new JButton("\u7EDF\u8BA1");
        btnTotal.setBounds(589, 357, 93, 23);
        btnTotal.addActionListener(new ActionListener() {

@Override
public void actionPerformed(ActionEvent e) {
// TODO Auto-generated method stub
                StringBuffer sb = new StringBuffer();
                String length = "";

                String fileTitle;
                String fileContent;
try {
                    BufferedReader reader = new BufferedReader(new FileReader(
"F://test.txt"));
while ((length = reader.readLine()) != null) {
                        sb.append(length);
                    }
                    fileContent = sb.toString();
new Total().find(fileContent);
                    String flag = "数据信息统计结果如下：" + "\n" + "汉字数目：";
                    flag += new Total().chineseCount;
                    flag += "\n英文字母个数：";
                    flag += new Total().englishCount;
                    flag += "\n特殊字符个数：";
                    flag += new Total().numberCount;
                    flag += "\n总的字符个数为："
                            + (new Total().chineseCount
                                    + new Total().englishCount + new Total().numberCount);
                    taShow.setText(flag);
new Total().chineseCount = 0;
new Total().englishCount = 0;
new Total().numberCount = 0;
                } catch (Exception ec) {
                    ec.printStackTrace();
                }
            }

        });
        contentPane.add(btnTotal);

        JLabel label_1 = new JLabel("\u6587\u672C\u7F16\u8F91\u533A\uFF1A");
        label_1.setBounds(449, 16, 93, 15);
        contentPane.add(label_1);
    }

public static void method1(String file, String conent) {
        BufferedWriter out = null;
try {
            out = new BufferedWriter(new OutputStreamWriter(
new FileOutputStream(file, true)));
            out.write(conent);
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
try {
if (out != null) {
                    out.close();
                }
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    }
}

下面解释一下为什么没有做好注释合作说明文档，因为我做注释做到一半的时候，出现了一点事故，导致没有来得及保存的文件丢失了，所以，请大家谨记，时刻记得保存编辑的被容，否则后果真的很严重。

代码追补解释，下面的代码块是我程序里面做的不好的，违背了代码的复用性原则，请予以为戒：

代码块1：

//代码的作用就是实现对特定的文件进行读取，并存入到String中，方便使用
StringBuffer sb = new StringBuffer();
String length = "";

String fileTitle;
String fileContent;
try {
                    BufferedReader reader = new BufferedReader(new FileReader(
"F://test.txt"));
while ((length = reader.readLine()) != null) {
                        sb.append(length);
                    }
                    fileContent = sb.toString();
                    taShow.setText("您打开的文件的内容是：" + fileContent);
                    CursorPosition = e.getDot();
                } catch (Exception e1) {
// TODO Auto-generated catch block
                    e1.printStackTrace();
                }

代码块2：

//代码实现了向特定的文件内追加数据，若想要覆盖式追加，把参数true去掉即可，默认为覆盖式添加数据
public static void method1(String file, String conent) {
        BufferedWriter out = null;
try {
out = new BufferedWriter(new OutputStreamWriter(
new FileOutputStream(file, true)));
out.write(conent);
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
try {
if (out != null) {
out.close();
                }
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    }

代码块3：
在统计模块中：

btnTotal.addActionListener(new ActionListener() {

            @Override
            public void actionPerformed(ActionEvent e) {
// TODO Auto-generated method stub
                StringBuffer sb = new StringBuffer();
String length = "";

String fileTitle;
String fileContent;
try {
                    BufferedReader reader = new BufferedReader(new FileReader(
"F://test.txt"));
while ((length = reader.readLine()) != null) {
                        sb.append(length);
                    }
                    fileContent = sb.toString();
new Total().find(fileContent);
String flag = "数据信息统计结果如下：" + "\n" + "汉字数目：";
                    flag += new Total().chineseCount;
                    flag += "\n英文字母个数：";
                    flag += new Total().englishCount;
                    flag += "\n特殊字符个数：";
                    flag += new Total().numberCount;
                    flag += "\n总的字符个数为："
                            + (new Total().chineseCount
                                    + new Total().englishCount + new Total().numberCount);
                    taShow.setText(flag);
new Total().chineseCount = 0;
new Total().englishCount = 0;
new Total().numberCount = 0;
                } catch (Exception ec) {
                    ec.printStackTrace();
                }
            }

其中使用到的new Total().find()方法，详见下面的代码：

package Editer;

/**
 * 分别统计出其中字符串中汉字，英文字母，数字，其他字符数量
 * @author wWX154783
 * 
 */
public class Total
{
static String E1,E2,E3;
    String str="a12中国3@b&4语*言3c";
static int chineseCount = 0;
static int englishCount = 0;
static int numberCount = 0;

public void find(String str)
    {


        String E1 = "[\u4e00-\u9fa5]";// 中文
        String E2 = "[a-zA-Z]";// 英文
        String E3 = "[0-9]";// 数字



        String temp;
for (int i = 0; i < str.length(); i++)
        {
            temp = String.valueOf(str.charAt(i));
if (temp.matches(E1))
            {
                chineseCount++;
            }
if (temp.matches(E2))
            {
                englishCount++;
            }
if (temp.matches(E3))
            {
                numberCount++;
            }
        }
        System.out.println("汉字数:" + chineseCount);
        System.out.println("英文数:" + englishCount);
        System.out.println("数字数:" + numberCount);
        System.out.println("特殊字符:" + (str.length() - (chineseCount + englishCount + numberCount)));
    }
}

好了，下面是程序运行后得到的界面，在此我要声明的是，程序仍然存在一些bug，表现在获得光标位置时的java.lang.IllegalStateException: Attempt to mutate in notification异常，主要还是线程相关，如果博友能解决，还望不吝赐教
Java实现简易的文本编辑器
Java实现简易的文本编辑器
Java实现简易的文本编辑器
Java实现简易的文本编辑器
能力有限，希望和大家一起进步，一同提高！

接下来的是我从网上找到的一份用C语言实现的简易的文本编辑器的实现，个人认为较之，我的简直就是太菜了，现在将代码贴出来，希望这篇C语言的经典能让更多的人知晓：

#include <stdio.h>
#define MAXLEN 80
#define MAXLINE 200
char buffer[MAXLEN],fname[120];
char *lineptr[MAXLINE];
FILE *fp;
void edit(),replace(),insert(),delete(),quit();
char comch[]="EeRrIiDdQq";/*命令符*/
void(*comfun[])()={edit,replace,insert,delete,quit};/*对应处理函数*/
int modified=0,/*正文被修改标志*/
    last;/*当前正文行数*/
char *chpt;/*输入命令行字符指针*/

main()
{
int j;

    last=0;
while(1)
    {
printf("\nInput a command:[e,r,i,d,q].\n");
        gets(buffer);/*读入命令行*/
for(chpt=buffer;*chpt=='\0'||*chpt=='\t';chpt++);/*掠过空白符*/
if(*chpt=='\0') continue;/*空行重新输入*/
for(j=0;comch[j]!='\0'&&comch[j]!=*chpt;j++);/*查命令符*/
if(comch[j]=='\0') continue;/*非法命令符*/
        chpt++;/*掠过命令符，指向参数*/
        (*comfun[j/2])();/*执行对应函数*/
fprintf(stdout,"The text is:\n");
for(j=0;j<last;j++)/*显示正文*/
fputs(lineptr[j],stdout);
    }
}
void quit()
{
int c;
if(modified)/* 如正文被修改 */
    {
printf("Save? (y/n)");
while(!(((c=getchar())>='a'&&c<='z')||(c>='A'&&c<='Z')));
if(c=='y'||c=='Y')
            save(fname); /* 保存被修改过的正文 */
    }
for(c=0;c<last;c++)
free(lineptr[c]);   /* 释放内存 */
exit(0);
}

void insert()
{
int k,m,i;
sscanf(chpt,"%d%d",&k,&m);  /* 读入参数 */
if(m<0||m>last||last+k>=MAXLINE)/* 检查参数合理性 */
    {
printf("Error!\n");
return;
    }
for(i=last;i>m;i--)/* 后继行向后移 */
        lineptr[i+k-1]=lineptr[i-1];
for(i=0;i<k;i++)   /* 读入k行正文，并插入 */
    {
        fgets(buffer,MAXLEN,stdin);
        lineptr[m+i]=(char *)malloc(strlen(buffer)+1);
strcpy(lineptr[m+i],buffer);
    }
    last+=k;    /* 修正正文行数 */
    modified=1; /* 正文被修改 */
}

void delete()
{
int i,j,m,n;
sscanf(chpt,"%d%d",&m,&n);  /* 读入参数 */
if(m<=0||m>last||n<m)   /* 检查参数合理性 */
    {
printf("Error!\n");
return;
    }
if(n>last)
        n=last;     /* 修正参数 */
for(i=m;i<=n;i++)   /* 删除正文 */
free(lineptr[i-1]);
for(i=m,j=n+1;j<=last;i++,j++)
        lineptr[i-1]=lineptr[j-1];
    last=i-1;   /* 修正正文行数 */
    modified=1; /* 正文被修改 */
}

void replace()
{
int k,m,n,i,j;
sscanf(chpt,"%d%d%d",&k,&m,&n); /* 读入参数 */
if(m<=0||m>last||n<m||last-(n-m+1)+k>=MAXLINE)/* 检查参数合理性 */
    {
printf("Error!\n");
return;
    }
/* 先完成删除 */
if(n>last)
        n=last;     /* 修正参数 */
for(i=m;i<=n;i++)   /* 删除正文 */
free(lineptr[i-1]);
for(i=m,j=n+1;j<=last;i++,j++)
        lineptr[i-1]=lineptr[j-1];
    last=i-1;
/* 以下完成插入 */
for(i=last;i>=m;i--)
        lineptr[i+k-1]=lineptr[i-1];
for(i=0;i<k;i++)
    {
        fgets(buffer,MAXLEN,stdin);
        lineptr[m+i-1]=(char *)malloc(strlen(buffer)+1);
strcpy(lineptr[m+i-1],buffer);
    }
    last+=k;    /* 修正正文行数 */
    modified=1; /* 正文被修改 */
}

save(char *fname)   /* 保存文件 */
{
int i;
    FILE *fp;
if((fp=fopen(fname,"w"))==NULL)
    {
fprintf(stderr,"Can't open %s.\n",fname);
exit(1);
    }
for(i=0;i<last;i++)
    {
fputs(lineptr[i],fp);
free(lineptr[i]);
    }
    fclose(fp);
}

void edit() /* 编辑命令 */
{
int i;
    FILE *fp;
    i=sscanf(chpt,"%s",fname);  /* 读入文件名 */
if(i!=1)
    {
printf("Enter file name.\n");
scanf("%s",fname);
    }
if((fp=fopen(fname,"r"))==NULL) /* 读打开 */
    {
        fp=fopen(fname,"w");    /* 如不存在，则创建文件 */
        fclose(fp);
        fp=fopen(fname,"r");    /* 重新读打开 */
    }
    i=0;
while(fgets(buffer,MAXLEN,fp)==buffer)
    {
        lineptr[i]=(char *)malloc(strlen(buffer)+1);
strcpy(lineptr[i++],buffer);
    }
    fclose(fp);
    last=i;
}
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