读取 .txt 文件时每次输出后缺少一行

Question

获得已安装程序的列表后，我将它们全部写入 [=19=] 文件。

String filename="C:\Users\Zeeshan\Desktop\pro.txt";
FileWriter fileWriter =new FileWriter(filename);
BufferedWriter br =new BufferedWriter(fileWriter);
String  command = "powershell.exe  \"Get-ItemProperty HKLM:\Software\Wow6432Node\Microsoft\Windows\CurrentVersion\Uninstall\* | Select-Object DisplayName | Format-Table –AutoSize\"";
Process p = Runtime.getRuntime().exec(command);
p.getOutputStream().close();
BufferedReader input =new BufferedReader(new InputStreamReader(p.getInputStream()));
String line;
int number=0;
while ((input.readLine()) != null)
{
    line=input.readLine();
    br.write(++number+"."+line);
    br.newLine();
}
br.close();
input.close();

但是当我尝试使用缓冲 reader 读取该文件时，它总是在每次输出后漏掉一行。

FileReader fr=new FileReader(filename);
BufferedReader br1=new BufferedReader(fr);
String line1;
while(br1.readLine()!=null)
{
    line1=br1.readLine();
    System.out.println(line1);
}
br1.close();

我的输出是这样的形式也请指导我为什么 null 出现在最后。

2.                                                             
4.Google Chrome                                                
6.RuntimePack 15.7.22                                          
8.Scan                                                         
10.                                                             
12.                                                             
14.4500K710_Software_Min                                        
16.Apple Software Update                                        
18.Microsoft Visual C++ 2015 x86 Additional Runtime - 14.0.24215
20.WebReg                                                       
22.Update for Microsoft .NET Framework 4.6.1 (KB4014606)        
24.Adobe Refresh Manager                                        
26.Microsoft Visual C++ 2015 x86 Minimum Runtime - 14.0.24215   
28.4500K710                                                     
30.Apple Application Support (32-bit)                           
32.                                                             
34.                                                             
36.BufferChm                                                    
null

Answer 1

你每次循环读两行：

while(br1.readLine()!=null)  //first
{
    line1=br1.readLine(); //second
    System.out.println(line1);
}

改为

while((line1= br1.readLine())!=null)
{
    System.out.println(line1);
}

Answer 2

创建一个临时布尔变量以继续循环：

Boolean continueLoop = true;

while (continueLoop) {
    line = input.readLine();
    if(line == null) {
        continueLoop = false; // break;
    }
    br.write(++number+"."+line);
    br.newLine();
}

读取 .txt 文件时每次输出后缺少一行

Missing one line after each output while reading a .txt file

java

file

bufferedreader

bufferedwriter