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\n"); file.append("Testing\n"); file << "More appending...\n"; 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); } } |
输出：
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