Java I/O
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今天Sailesh那儿有个活想要找出所有cfmail出处的,他用的dreawaver,我用NP++找的慢死,于是我看他那有个xml export,我说把那个给我,他还说这个费劲啊,我想办法克服他不就行了。我的办法就是text processing,我用JAVA呗,我的新宠,可是不会用啊,let's 学!
首先是stream的概念,啥是流?官方解义:An I/O Stream represents an input source or anoutput destination, which means:就是在程序吃进去和吐出来的那串流。联想一下C++, there we go!
然后是Java里面的class,有好多,我先学了bytestream,character stream,区别就是前者是8位读写,后者是Unicode 16位。
最后学了个buffered stream,是因为来回从文件来回太慢,buffer顾名思义把它缓存,加快了。
总结如下,package import同名:
byte stream: FileInputStream / FileOutputStream,
character stream: FileReader / FileWriter,
buffered stream: BufferedReader / BufferedWriter.
另附CODES:
package test;import java.io.BufferedReader;import java.io.BufferedWriter;import java.io.FileReader;import java.io.FileWriter;import java.io.IOException;public class test { public static void main(String[] args) throws IOException { BufferedReader br = null; BufferedWriter bw = null; try { br = new BufferedReader(new FileReader("test.txt")); bw = new BufferedWriter(new FileWriter("results.txt")); String sCurrentLine;; while ((sCurrentLine = br.readLine()) != null) { bw.write(processOneLine(sCurrentLine, "mailto:")); bw.write("\n"); } } finally { if (br != null) { br.close(); } if (bw != null) { bw.close(); } } } public static String processOneLine(String line,String target) { String result = new String(); if (line.contains(target)) { int begin = line.indexOf(target)+target.length(); int end = begin; while (end < line.length()) { if (line.charAt(end) =='\"') break; end++; } result = line.substring(begin,end); } return result; }}
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