JAVA 用于比较 2 个或更多文本文件的程序

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 File 1 的每一行与 File 2 的所有行进行比较（即比较文件 1 的第 1 行与文件 2 的所有行）。当我运行下面的代码将文件 1 的第 1 行与文件 2 的所有行进行比较时，程序终止。

注意：我试过Danail Alexiev的想法（见答案）但是循环是运行ning无限, (也没有跳到文件 1 的第 2 行，文件 1 的第 1 行与文件 2 的所有行无限循环)

以下文件

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);
     }
    }
  }

O/P :

=---Matched----=1321sc231231a23d1a32df1adfsdfsdfsd -->1321sc231231a23d1a32df1adfsdfsdfsd =---Not Matched----=1321sc231231a23d1a32df1adfsdfsdfsd -->fsdfs4dfs =---Not Matched----=1321sc231231a23d1a32df1adfsdfsdfsd -->dfsdf =---Not Matched----=1321sc231231a23d1a32df1adfsdfsdfsd -->3sd1f =---Not Matched----=1321sc231231a23d1a32df1adfsdfsdfsd -->sdfs4df3s =---Not Matched----=1321sc231231a23d1a32df1adfsdfsdfsd -->df0 =---Not Matched----=1321sc231231a23d1a32df1adfsdfsdfsd -->sd4f =---Not Matched----=1321sc231231a23d1a32df1adfsdfsdfsd -->sdf =---Not Matched----=1321sc231231a23d1a32df1adfsdfsdfsd -->sdf1 =---Not Matched----=1321sc231231a23d1a32df1adfsdfsdfsd -->3sdf =---Not Matched----=1321sc231231a23d1a32df1adfsdfsdfsd -->sdfs4df6s =---Not Matched----=1321sc231231a23d1a32df1adfsdfsdfsd -->fs1df =---Not Matched----=1321sc231231a23d1a32df1adfsdfsdfsd -->3sdfsd =---Not Matched----=1321sc231231a23d1a32df1adfsdfsdfsd -->fs.d1f =---Not Matched----=1321sc231231a23d1a32df1adfsdfsdfsd -->s3d1 =---Not Matched----=1321sc231231a23d1a32df1adfsdfsdfsd -->sdf1s =---Not Matched----=1321sc231231a23d1a32df1adfsdfsdfsd -->df1 =---Not Matched----=1321sc231231a23d1a32df1adfsdfsdfsd -->sdf1sdf

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
}

一定要包括检查以检测文件行数不同的情况。

编辑：

经过OP的澄清，我想我知道了问题所在。

您正在尝试边读边读文件。当您将 File1 的第一行与 File2 的所有行进行比较时，嵌套的 while 循环将停止，因为您已经从文件中读取了所有行并且 readLine() 将 return null 每个时间.

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 中的行进行比较。

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;
}

InPut:

File1:

java
c++

test
stack
test
overflow
extraLine

File2:

stack
overflow
test
java
c++

test

Ouput

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

解决了，谢谢大家

JAVA 用于比较 2 个或更多文本文件的程序

JAVA program for 2 or more text files comparing

java

compare

file

filecompare