java - 用于比较 2 个或更多文本文件的 JAVA 程序

Question

我想比较 2 个或更多文本文件以查找重复条目。O/P 应该说文件中的那些行是否匹配。

我想将文件 1的每一行与文件 2的所有行进行比较（即，将文件 1 的第 1 行与文件 2 的所有行进行比较）。当我运行以下代码时，将文件 1 的第 1 行与文件 2 的所有行进行比较，然后程序被终止。

注意：我尝试了Danail Alexiev的想法（见答案），但循环无限运行，（也没有跳到文件 1 的第 2 行，文件 1 的第 1 行与文件 2 的所有行的无限循环）

下面的文件

文件 1：内容

21321sc231231a23d1a32df1adfsdfsdfsd
fsdfs4dfs
dfsdf
3sd1f
sdfs4df3s 
df0 
sd4f 
sdf 
sdf1 
3sdf 
sdfs4df6s 
fs1df 
3sdfsd 
fs.d1f 
s3d1
sdf1s 
df1 
sdf1sdf

文件 2：内容

21321sc231231a23d1a32df1adfsdfsdfsd
fsdfs4dfs
dfsdf
3sd1f
sdfs4df3s 
df0 
sd4f 
sdf 
sdf1 
3sdf 
sdfs4df6s 
fs1df 
3sdfsd 
fs.d1f 
s3d1
sdf1s 
df1 
sdf1sdf

代码：

while ((sCurrentLine1 =file1.readLine()) != null )
 {
  while ((sCurrentLine2 =file2.readLine()) != null )
   {
    if(sCurrentLine1.equalsIgnoreCase(sCurrentLine2))
     {
      System.out.println("=---Matched----=" + sCurrentLine1 + " -->" + sCurrentLine2);
     }
     else
     {
      System.out.println("=---Not Matched----=" + sCurrentLine1 + " -->" + sCurrentLine2);
     }
    }
  }

开/关 ：

=---Matched----=1321sc231231a23d1a32df1adfsdfsdfsd -->1321sc231231a23d1a32df1adfsdfsdfsd =---Not Matched----=1321sc231231a23d1a32df1adfsdfsdfsd -->fsdfs4dfs =---Not Matched----=1321sc231231a23d1a32df1adfsdfsdfsd -->dfsdf =-- -不匹配----=1321sc231231a23d1a32df1adfsdfsdfsd -->3sd1f =---不匹配----=1321sc231231a23d1a32df1adfsdfsdfsd -->sdfs4df3s =---不匹配----=1321sc231231a23d1a32df1adfsdfsdfsd -->0不匹配匹配----=1321sc231231a23d1a32df1adfsdfsdfsd -->sd4f =---不匹配----=1321sc231231a23d1a32df1adfsdfsdfsd -->sdf =---不匹配----=1321sc231231a23d1a32df1adfsdfsdfsd -->sdf1 =---不匹配- ---=1321sc231231a23d1a32df1adfsdfsdfsd -->3sdf =---不匹配----=1321sc231231a23d1a32df1adfsdfsdfsd -->sdfs4df6s =---不匹配----=1321sc231231a23d1a32df1adfsdfsdfsd -->fs1df =---不匹配----=1321sc231231a23d1a32df1adfsdfsdfsd -->3sdfsd =---不匹配----=1321sc231231a23d1a32df1adfsdfsdfsd -->fs.d1f =---不匹配----=1321sc231231a23d1a32df1adfsdfsdfs s3d1 =---不匹配----=1321sc231231a23d1a32df1adfsdfsdfsd -->sdf1s =---不匹配----=1321sc231231a23d1a32df1adfsdfsdfsd -->df1 =---不匹配----=1321sc231231a23d1a32df1adfsdfsdfsd -->s

Answer 1

您正在将第二个文件的每一行与第一个文件的每一行进行比较。

为了进行正确的比较，您必须检查匹配的行号。

将您的 while 循环更改为：

while (((sCurrentLine1 = file1.readLine()) != null) && ((sCurrentLine2 = file2.readLine()) != null) {
    // your comparison
}

确保包括检查以检测文件具有不同行数的情况。

编辑：

经过OP的澄清后，我想我知道问题所在。

您正在尝试随时读取文件。当您将 File1 中的第一行与 File2 中的所有行进行比较时，嵌套的 while 循环将停止，因为您已经读取了文件中的所有行并且每次readLine()都会返回。null

要解决此问题，您需要提前读取 File2 中的所有行，并使用它们与 File1 的行进行比较。

Answer 2

public void CompareFileMain()
{
   /*int tempvar = 0;
   int tempvar1 =0 ;*/
   String Tlines1[] = new String [100];
   String Tlines2[] = new String [100];
   String tempstring1 = null;
   String tempstring2 = null;
   int file1lines;
   int file2lines ;
   System.out.println(file1lines = linesOffile1());
   System.out.println(file2lines = linesOffile2());
   try {
    file1 = new BufferedReader(new FileReader(SOAPFile));
    file2 = new BufferedReader(new FileReader(RestFile));
    int oplines = 1;
    while ((sCurrentLine1 =file1.readLine()) != null ) 
    {
        tempstring1 = sCurrentLine1;
        while ((sCurrentLine2 =file2.readLine()) != null )
        {
               tempstring2 = sCurrentLine2;
                }
        if ((sCurrentLine2 =file2.readLine()) == null)
        {
           System.out.println("File 1 --> line# "+oplines +"\t");
           CompareFileSub(tempstring1, tempstring2);
        }
        oplines = oplines+1;
    }
        } catch (IOException e) {
        e.printStackTrace();
        }
}
public void CompareFileSub(String t1, String t2) throws IOException  // reading file 2 
{
  file2 = new BufferedReader(new FileReader(RestFile));
  int oplines = 1;
  while ((sCurrentLine2 =file2.readLine()) != null )
  {
    t2 = sCurrentLine2;
    if((t1.contains(t2) && (t2.contains(t1))))
    {
          System.out.print(t1+"-->"+t2+"---->matched \t");
          System.out.println("File 2 --> line# "+oplines +"\n");
    }
    else
    {
          System.out.print(t1+"-->"+t2+"---->not matched \t");
          System.out.println("File 2 --> line# "+oplines +"\n");
    }
              oplines = oplines+1;
 }
}

public int linesOffile1() //Count file 1 lines
{
  try {
    while ((sCurrentLine1 =file1.readLine()) != null )
    {
        //System.out.println("Taken line sCurrentLine1 "+sCurrentLine1);
        //System.out.println("Taken line sCurrentLine1 "+i);
        i=i+1;
    }                                   
        } catch (IOException e) {
            e.printStackTrace();
            }
   finally {
    try {
           if (file1 == null)file1.close();
         } catch (IOException ex) {
                ex.printStackTrace();
                }
    }
   return i;

}      
public int linesOffile2() //Count file 2 lines
{
  try {
    while ((sCurrentLine2 =file2.readLine()) != null )
    {   
    //System.out.println("Taken line sCurrentLine2 "+sCurrentLine2);
    //System.out.println("Taken line sCurrentLine2 "+j);
    j=j+1;
    }
        } catch (IOException e) {
            e.printStackTrace();
            }   
  finally {
    try {
        if (file2 == null)file1.close();
    } catch (IOException ex) {
            ex.printStackTrace();
            }
    }
 return j;
}      

输入：

文件1：

java
c++

test
stack
test
overflow
extraLine

文件2：

stack
overflow
test
java
c++

test

输出

8
7
File 1 --> line# 1  
java-->stack---->not matched    File 2 --> line# 1

java-->overflow---->not matched     File 2 --> line# 2

java-->test---->not matched     File 2 --> line# 3

java-->java---->matched     File 2 --> line# 4

java-->c++---->not matched  File 2 --> line# 5

java-->---->not matched     File 2 --> line# 6

java-->test---->not matched     File 2 --> line# 7

File 1 --> line# 2  
c++-->stack---->not matched     File 2 --> line# 1

c++-->overflow---->not matched  File 2 --> line# 2

c++-->test---->not matched  File 2 --> line# 3

c++-->java---->not matched  File 2 --> line# 4

c++-->c++---->matched   File 2 --> line# 5

c++-->---->not matched  File 2 --> line# 6

c++-->test---->not matched  File 2 --> line# 7

File 1 --> line# 3  
-->stack---->not matched    File 2 --> line# 1

-->overflow---->not matched     File 2 --> line# 2

-->test---->not matched     File 2 --> line# 3

-->java---->not matched     File 2 --> line# 4

-->c++---->not matched  File 2 --> line# 5

-->---->matched     File 2 --> line# 6

-->test---->not matched     File 2 --> line# 7

File 1 --> line# 4  
test-->stack---->not matched    File 2 --> line# 1

test-->overflow---->not matched     File 2 --> line# 2

test-->test---->matched     File 2 --> line# 3

test-->java---->not matched     File 2 --> line# 4

test-->c++---->not matched  File 2 --> line# 5

test-->---->not matched     File 2 --> line# 6

test-->test---->matched     File 2 --> line# 7

File 1 --> line# 5  
stack-->stack---->matched   File 2 --> line# 1

stack-->overflow---->not matched    File 2 --> line# 2

stack-->test---->not matched    File 2 --> line# 3

stack-->java---->not matched    File 2 --> line# 4

stack-->c++---->not matched     File 2 --> line# 5

stack-->---->not matched    File 2 --> line# 6

stack-->test---->not matched    File 2 --> line# 7

File 1 --> line# 6  
test-->stack---->not matched    File 2 --> line# 1

test-->overflow---->not matched     File 2 --> line# 2

test-->test---->matched     File 2 --> line# 3

test-->java---->not matched     File 2 --> line# 4

test-->c++---->not matched  File 2 --> line# 5

test-->---->not matched     File 2 --> line# 6

test-->test---->matched     File 2 --> line# 7

File 1 --> line# 7  
overflow-->stack---->not matched    File 2 --> line# 1

overflow-->overflow---->matched     File 2 --> line# 2

overflow-->test---->not matched     File 2 --> line# 3

overflow-->java---->not matched     File 2 --> line# 4

overflow-->c++---->not matched  File 2 --> line# 5

overflow-->---->not matched     File 2 --> line# 6

overflow-->test---->not matched     File 2 --> line# 7

File 1 --> line# 8  
extraLine-->stack---->not matched   File 2 --> line# 1

extraLine-->overflow---->not matched    File 2 --> line# 2

extraLine-->test---->not matched    File 2 --> line# 3

extraLine-->java---->not matched    File 2 --> line# 4

extraLine-->c++---->not matched     File 2 --> line# 5

extraLine-->---->not matched    File 2 --> line# 6

extraLine-->test---->not matched    File 2 --> line# 7

得到解决方案，谢谢大家