1.任务要求：
在DOS窗口下，实现查看全文、统计总行数/总页码数、查找指定行、指定页码、翻页
2.阅读器实现方式
输入1(查看全文、统计总行数/总页码数、)
输入2（读取指定行，查找其上下行）
输入+显示下一行，输入-显示上一行，输入bye返回上一级
输入3（查找指定页码，实现翻页功能）
输入+显示下一页，输入-显示上一页，输入bye返回上一级
3.具体代码如下
主要分为三个子程序，然后在主程序中分别进行调用，以此来实现小说阅读器的各功能。
import java.io.*;import java.util.Scanner;class Display_txt {//查看全文（以每10个段落为一页，统计总行数）static void ReadAll (String fileName) throws IOException{BufferedReader br = new BufferedReader(new InputStreamReader (new FileInputStream (fileName)));//使用缓冲区的方法将数据读入到缓冲区中String str;int i=1;int a=0,b=1;while((str = br.readLine()) != null){System.out.println( "["+i+"]:" + str);System.out.println( );if(i==a+10) //分页(以每10个段落为一页){System.out.println("------------------------ page "+b+" ------------------------");a=a+10;b=b+1;}i=i+1;}System.out.println("------------------------ page "+b+" ------------------------\n");i=i-1;System.out.println("本文共有"+i +"行; 共有"+b+"页\n");}//查看指定页码，实现上下翻页static void getPage (String fileName) throws IOException{System.out.println("(提示：输入00返回上一级)");System.out.print("请输入查询页码：");Scanner sc=new Scanner(System.in);int pageNumber=sc.nextInt();while(pageNumber!=00){BufferedReader br = new BufferedReader(new InputStreamReader (new FileInputStream (fileName)));String line = br.readLine();int num=0;int startNumber=(pageNumber-1)*10+1;int endNumber=pageNumber*10;while(line!= null){if(startNumber==++num) {System.out.println("["+startNumber+"]:"+line);int i=startNumber;while(i<endNumber){i=i+1;line=br.readLine();System.out.println("["+i+"]:"+line);}System.out.println("-------------------page "+ pageNumber+"--------------------");System.out.println("(提示：输入+(下一页)；输入-(上一页);输入bye(返回上一级);");System.out.print("请输入：");Scanner sc1=new Scanner(System.in);String pageNumber1=sc1.next();int pn=pageNumber;while(!pageNumber1.equals("bye")){if(pageNumber1.equals("+")){BufferedReader br1 = new BufferedReader(new InputStreamReader (new FileInputStream (fileName)));String line1=br1.readLine();pn=pn+1;int num1=0;int startNumber1=(pn-1)*10+1,endNumber1=pn*10;while(line1!= null){if (startNumber1==++num1){System.out.println("["+startNumber1+"]:"+line1);int a=startNumber1;while(a<endNumber1){a=a+1;line1=br1.readLine();System.out.println("["+a+"]:"+line1);}System.out.println("-------------------page "+ pn+"--------------------");}line1=br1.readLine();}}if(pageNumber1.equals("-")){BufferedReader br2 = new BufferedReader(new InputStreamReader (new FileInputStream (fileName)));String line2=br2.readLine();pn=pn-1;int num2=0;int startNumber2=(pn-1)*10+1,endNumber2=pn*10;while(line2!= null){if (startNumber2==++num2){System.out.println("["+startNumber2+"]:"+line2);int b=startNumber2;while(b<endNumber2){b=b+1;line2=br2.readLine();System.out.println("["+b+"]:"+line2);}System.out.println("-------------------page "+ pn+"--------------------");}line2=br2.readLine();}}else{}System.out.print("请输入：");pageNumber1=sc1.next();}}line=br.readLine();}System.out.println("(提示：输入00返回上一级)");System.out.print("请输入查询页码：");pageNumber=sc.nextInt();}System.out.println("返回到上一级");}//读取指定行,并查看上下行static void readxxLine (String fileName) throws IOException{System.out.println("(提示：输入00返回上一级)");System.out.print("请输入查询行：");Scanner sc=new Scanner(System.in);int lineNumber=sc.nextInt();while(lineNumber!=00){BufferedReader br = new BufferedReader(new InputStreamReader (new FileInputStream (fileName)));//使用缓冲区的方法将数据读入到缓冲区中String line = br.readLine();int num=0;while(line!= null){if(lineNumber==++num) {System.out.println("["+lineNumber+"]:"+line);System.out.println("提示：输入+(下一行)；输入-(上一行)；输入bye(返回上一级)");System.out.print("请输入：");Scanner sc1=new Scanner(System.in);String lineNumber1=sc1.next();int ln=lineNumber;while(!lineNumber1.equals("bye")){if(lineNumber1.equals("+")){BufferedReader br1 = new BufferedReader(new InputStreamReader (new FileInputStream (fileName)));String line1=br1.readLine();ln=ln+1;int num1=0;while(line1!= null){if (ln==++num1){System.out.println("["+ln+"]:"+line1);}line1=br1.readLine();}}if(lineNumber1.equals("-")){BufferedReader br2 = new BufferedReader(new InputStreamReader (new FileInputStream (fileName)));String line2=br2.readLine();ln=ln-1;int num2=0;while(line2!= null){if (ln==++num2){System.out.println("["+ln+"]:"+line2);}line2=br2.readLine();}}else{}lineNumber1=sc1.next();}}line=br.readLine();}System.out.println("(提示：输入00返回上一级)");System.out.print("请输入查询行：");lineNumber=sc.nextInt();}System.out.println("返回上一级");}//主程序public static void main(String[] args) throws IOException{String fileName ="E:/java task/cookie reader/哲学家都干了些什么.txt";System.out.println("提示：输入1(查看全文,统计全文总行数和总页码数)；输入2(读取指定行，并查看上下行)；输入3(查看指定页码的内容，上下翻页)；");while(true){System.out.print("请输入：");Scanner sc=new Scanner(System.in);int j=sc.nextInt();if(j==1){ReadAll(fileName);j=0;}if(j==2){readxxLine(fileName);j=0;}if(j==3){getPage(fileName);j=0;}if(j==0){}else{System.out.println("输入错误");}System.out.println("提示：输入1(查看全文,统计全文总行数和总页码数)；输入2(读取指定行，并查看上下行)；输入3(查看指定页码的内容，上下翻页)；");}}}
java实现小说阅读器（功能：查看全文 统计总行数/总页码数 查找指定行 指定页码 实现翻页）
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