学步园

本示例从网上下载一本小说，并保存为 UTF-8 格式。

import java.io.BufferedReader;<br /> import java.io.File;<br /> import java.io.FileOutputStream;<br /> import java.io.IOException;<br /> import java.io.InputStreamReader;<br /> import java.io.OutputStreamWriter;<br /> import java.io.Writer;<br /> import java.net.MalformedURLException;<br /> import java.net.URL;<br /> import java.net.URLConnection;</p> <p>/**<br /> * 下载文本文件，并以指定的编码保存<br /> * @author hyd<br /> */<br /> public class DownloadTextAndSave {</p> <p> // 要下载的文件位置<br /> private static final String FILE_URL = "http://www.9251.com/DownLoad/File/Book/xh/DownloadFile/qzlz20091116.txt";</p> <p> // 要保存的文件名（或路径）<br /> private static final String SAVE_AS_FILE_NAME = "novel.txt";</p> <p> // 保存使用的编码<br /> private static final String SAVE_AS_ENCODING = "UTF-8";</p> <p> // 程序入口<br /> public static void main(String[] args) throws Exception {<br /> String content = download(FILE_URL);<br /> saveAs(content, SAVE_AS_FILE_NAME, SAVE_AS_ENCODING);<br /> }</p> <p> // 以指定编码保存文件<br /> private static void saveAs(String content, String filename, String SAVE_AS_ENCODING) throws IOException {<br /> // 创建文件<br /> File file=new File(filename);<br /> if (!file.exists()) {<br /> file.createNewFile();<br /> }</p> <p> // 写入内容<br /> Writer writer = new OutputStreamWriter(new FileOutputStream(file), SAVE_AS_ENCODING);<br /> try {<br /> writer.write(content);<br /> } finally {<br /> writer.close();<br /> System.out.println("文件保存完毕。");<br /> }<br /> }</p> <p> // 下载指定位置的文本文件，并返回文件内容<br /> private static String download(String FILE_URL) throws MalformedURLException, IOException {<br /> URLConnection conn = new URL(FILE_URL).openConnection();<br /> System.out.println("正在打开 /"" + FILE_URL + "/"...");</p> <p> BufferedReader reader = new BufferedReader(new InputStreamReader(conn.getInputStream()));</p> <p> try {<br /> String line;<br /> StringBuffer result = new StringBuffer();<br /> while ((line = reader.readLine()) != null) {<br /> result.append(line).append("/n");<br /> }<br /> System.out.println("一共读取 " + result.length() + " 个字符。");</p> <p> return result.toString();<br /> } finally {<br /> reader.close();<br /> }<br /> }<br /> }<br />