XenuLink Sleuth term introduced
"Xenu link detection detective" is a widely used tool to detect dead links. Links can be detected in ordinary web links, images, frames, plug-ins, backgrounds, style sheets, scripts and java program.
Then God when the horse appeared dead link:
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Under conditions of dynamic link database is no longer supported, become a dead link.
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Move a file or web page position, resulting in a link to it becomes a dead link.
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Web content updated and replaced by other links, the original link becomes a dead link.
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The server is set incorrectly.
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Basic operation Xenu Link Sleuth
Overall Screenshots
Before execution, first add the URL to be tested
Began setting box after clicking "checkurl" pop-up, which generally do not check external lin check, if you need to check external sites, check the box, otherwise we must cancel it, in order to prevent crawling of external sites
option settings: You can set up to 100 parallel threads, seemingly no limit to the maximum number of layers of testing, but the maximum recommended level of less than 6, otherwise there will be a lot of links, test the speed and effectiveness will be greatly reduced, I believe the general site nor link more than 6 layers. Report (Report) optional full. More concerned about the link is interrupted, interrupt internal links, statistics, effective text links.
Click on "option" OK, "point" OK, program execution begins, following execution status display screenshot
Threads - parallel thread execution maximum setting 100
74 of 165URLs (40%) DONE - percentage test performed
0:00: 06-- consuming
Finished status display
Analysis of the results
Skip external - External Links skip test
OK - Test by
Not found - dead link
View the final report, so that the entire test site links work is done in less than 2 minutes, but can also provide a source of the error to the developer, it is not very easy to use them! The report also very intuitive, can be set to automatically send mail.
当然是工具就有优缺点，我在这里罗列下自己的看法：
- 优点：
体积小巧（软件大小不到1MB），界面简单
检查完后，可生成链接情况报告，还能自动将报告发送到指定 email 信箱
给出死链接所在页面，方便修改或删除死链接；
可设置并列线程和测试最大层次
测试链接的工具也很多。
- 缺点：
只检查链接是否有效，不检查是否正确
只有Windows版本
网速慢，可能会发生超时（Timeout）错误，导致无法得知目标链接到底是不是死链接
存在检测不准确的问题（极少，大家可以通过点击死链接，查看是否能链接正确来再次确认）
当然除了XENU以外还有很多好用的测试链接小工具，大家可以自己下来看看，多数大同小异，这里发2个我自己觉得也不错的地址出来：
HTML Link Validator
http://lithopssoft.com/hlv/index.html
Web Link Validator
http://www.relsoftware.com/wlv/