1 文件和网络I/O
1.1 文件处理
groovy向java所提供的File 类，新增了几个方便的方法。分别是：eachLine和.text。
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package file
class FileToConsole {
static main(args) { println("====将文件中的内容写入到控制台"); File file = new File("D:/tutorial/15groovy/code/GroovyTutorial/src/file/myfile.txt"); file.eachLine {line -> println line; };
println ("在每一行的前边加上一个行号，然后打印到控制台"); def lineNumber = 0; file = new File("D:/tutorial/15groovy/code/GroovyTutorial/src/file/myfile.txt"); file.eachLine {line -> lineNumber++; println ("$lineNumber:$line"); }; println ("读文件内容并写入到String"); String s = new File("D:/tutorial/15groovy/code/GroovyTutorial/src/file/myfile.txt").text; println s; }
} |
输出
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====将文件中的内容写入到控制台 hello world hello zuoys! 在每一行的前边加上一个行号，然后打印到控制台 1:hello world 2:hello zuoys! 读文件内容并写入到String hello world hello zuoys! |
File 对象提供了几个方法，如 eachFile, eachDir 和earchFileRecursively ，闭包使用。
1.2 向文件写入内容
写入文件，并且向文件中追加内容，以及从磁盘中删除文件。
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package file
class WriteAndAppendToFile { static def filePath = "D:/tutorial/15groovy/code/GroovyTutorial/src/file/output.txt"; static main(args) { File file = new File(filePath); file.write("Hello "); file.append("Testing "); file << "More appending... "; File result = new File(filePath); println (result.text); //从磁盘中删除该文件 file.delete(); }
} |
输出
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Hello Testing More appending... |
1.3 处理http的get请求
抓取http远端页面，类似读取一个文本文件。
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package file
class ReadHttpPage {
static main(args) { String url = "http://www.cnblogs.com/yaoyuan2/"; //法1 def data = new URL(url).text; //法2：使用groovy JDK方法 //data = url.toURL().text; println (data); }
}
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输出：
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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml" lang="zh-cn"> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8"/> <title>遥远2 - 博客园</title> <link type="text/css" rel="stylesheet" href="/bundles/blog-common.css?v=umTYGJ1Xbo61obX_Gqsil3krUSBXOilTLax6nesdN401"/> <link id="MainCss" type="text/css" rel="stylesheet" href="/skins/SimpleClear/bundle-SimpleClear.css?v=EVOKy_9d-0OzsDt7Iaw0OHSiRqKJoQVRFQeK_xCGZ6c1"/> <link title="RSS" type="application/rss+xml" rel="alternate" href="http://www.cnblogs.com/yaoyuan2/rss"/> <link title="RSD" type="application/rsd+xml" rel="EditURI" href="http://www.cnblogs.com/yaoyuan2/rsd.xml"/> <link type="application/wlwmanifest+xml" rel="wlwmanifest" href="http://www.cnblogs.com/yaoyuan2/wlwmanifest.xml"/> <script src="//common.cnblogs.com/script/jquery.js" type="text/javascript"></script> <script type="text/javascript">var currentBlogApp = 'yaoyuan2', cb_enable_mathjax=false;</script> <script src="/bundles/blog-common.js?v=5U27mPu5I0KkEyh-j235bo21EbCO9CoRnrVjj5DiOjI1" type="text/javascript"></script> </head> <body> <a name="top"></a>
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