ResolveUrls (apache-nutch 1.20 API)

java.lang.Object
- org.apache.nutch.tools.ResolveUrls

```
public class ResolveUrls
extends Object
```
A simple tool that will spin up multiple threads to resolve urls to ip addresses. This can be used to verify that pages that are failing due to UnknownHostException during fetching are actually bad and are not failing due to a dns problem in fetching.

Constructor Summary

Constructors
Constructor	Description
`ResolveUrls(String urlsFile)`	Create a new ResolveUrls with a file from the local file system.
`ResolveUrls(String urlsFile, int numThreads)`	Create a new ResolveUrls with a urls file and a number of threads for the Thread pool.

Method Summary

All Methods Static Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`static void`	`main(String[] args)`	Runs the resolve urls tool.
`void`	`resolveUrls()`	Creates a thread pool for resolving urls.

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Constructor Detail
  - ResolveUrls
```
public ResolveUrls(String urlsFile)
```
    Create a new ResolveUrls with a file from the local file system.
    
    Parameters:
    
    urlsFile - The local urls file, one url per line.
  - ResolveUrls
```
public ResolveUrls(String urlsFile,
                   int numThreads)
```
    Create a new ResolveUrls with a urls file and a number of threads for the Thread pool. Number of threads is 100 by default.
    
    Parameters:
    
    urlsFile - The local urls file, one url per line.
    
    numThreads - The number of threads used to resolve urls in parallel.
- Method Detail
  - resolveUrls
```
public void resolveUrls()
```
    Creates a thread pool for resolving urls. Reads in the url file on the local filesystem. For each url it attempts to resolve it keeping a total account of the number resolved, errored, and the amount of time.
  - main
```
public static void main(String[] args)
```
    Runs the resolve urls tool.
    
    Parameters:
    
    args - the input arguments for this tool. Running with 'help' will print parameter options.