[英]Reading From directories+sub-directories
this is a semi homework and I've been trying for ages but without luck,basically I'm doing a Search engine-Like program,where i read files in my directory + their sub directory's and Read the text files to search for a match,i searched endlessly but without clear answer so I'd appreciate if any one could help. 这是一个半作业,我已经尝试了很长时间了,但是没有运气,基本上我正在做一个类似于搜索引擎的程序,在该程序中,我读取目录中的文件及其子目录,然后读取文本文件以查找匹配项,我无休止地搜索,但没有明确的答案,因此,如果有任何帮助,我将不胜感激。
this was my best try but the problem with it that it only took the files from the sub directory and ignored the main/root directory,tried to figure out why but couldn't. 这是我的最佳尝试,但问题是它仅从子目录中提取文件,而忽略了main / root目录,试图找出原因,但不能。
public void indexDirectory(File dir) {
for(int i=0;i<50;i++)
ls[i]=new LinkList();//array of Linked lists to store addresses of each Linked list that has a file
try{
files= dir.listFiles();
for (int i = 0; i < files.length; i++) {
if(files[i].isDirectory())
indexDirectory(files[i]);
if(files[i].isFile()){
if(files[i]!=null)
indexFile(files[i]);
} //end if(isFile)
} //end For loop
}catch(FileNotFoundException e){
System.out.println("error ");
}}
second version after serching the web and trying to emulate what i found,but didn't work sadly. 在浏览网络并尝试模仿我发现的内容之后的第二个版本,但并没有令人遗憾地工作。
public void indexDirectory(File dir) {
for(int i=0;i<50;i++)
ls[i]=new LinkList();
try{
if(dir.isFile()){
indexFile(dir); //this method takes each directory and read the words and save them in
// array of linked list
}
else if(dir.isDirectory()){
files= dir.listFiles();
if(files!=null) {
for (int i = 0; i < files.length; i++) {
if(files[i].isDirectory()){
indexDirectory(files[i]); //recursive call
}}
}catch(FileNotFoundException e){
System.out.println("error ");
}}
In the first version, you loop through the entire file.length and check only for file.isDirectory and after that (ie. after all files/folders have been traversed) you check if it is a file. 在第一个版本中,您遍历整个file.length并仅检查file.isDirectory,然后(即在遍历所有文件/文件夹之后)检查它是否是文件。 That's why you cannot read through current directory's files.
这就是为什么您无法读取当前目录的文件的原因。 Simply put the
简单地把
if(files[i].isFile()){
if(files[i]!=null)
indexFile(files[i]); //the method to read from these files and save to array of lists.
}
block in for loop and it should work in the first version. 阻止for循环,并且应该在第一个版本中运行。 One more thing I didn't understand the purpose of ls variable here.
还有一件我不了解ls变量的目的。
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