1.读txt文件

package com.review;import java.io.BufferedReader;import java.io.File;import java.io.FileInputStream;import java.io.FileNotFoundException;import java.io.IOException;import java.io.InputStream;import java.io.InputStreamReader;public class ReadFilePractice {	/**	 * @param args	 * @throws IOException 	 */	public static void main(String[] args) throws IOException {		// TODO Auto-generated method stub//		File file = new File("C:/Users/xqbigbear/Desktop/test.txt");//		FileInputStream fis = new FileInputStream(file);//		InputStreamReader isr = new InputStreamReader(fis, "gbk");//		BufferedReader br = new BufferedReader(isr);		/**		 * 装饰者模式简写		 */		InputStreamReader is = new InputStreamReader(new FileInputStream(new File("C:/Users/xqbigbear/Desktop/test.txt")),"GBK");//		如果直接对is使用read方法，效率不高，故将is用BufferedReader包装起来，每次缓冲一部分再读		BufferedReader br = new BufferedReader(is);				String s;		long start = System.currentTimeMillis();		while((s=br.readLine())!=null){			System.out.println((String)s);		}		long end = System.currentTimeMillis();		is.close();		br.close();		System.out.println("");		System.out.println("耗时 " + (end-start) + " ms");	}}

2.写入txt

package com.review;import java.io.BufferedWriter;import java.io.File;import java.io.FileNotFoundException;import java.io.FileOutputStream;import java.io.IOException;import java.io.OutputStreamWriter;import java.io.UnsupportedEncodingException;public class WriteFilePractice {	/**	 * @param args	 * @throws IOException 	 */	public static void main(String[] args) throws IOException {		// TODO Auto-generated method stub//		FileOutputStream fo = new FileOutputStream(new File("C:/Users/xqbigbear/Desktop/new.txt"));		OutputStreamWriter osw = new OutputStreamWriter(new FileOutputStream(new File("C:/Users/xqbigbear/Desktop/new.txt")), "GBK");		BufferedWriter bw = new BufferedWriter(osw);		String s = "这和FileReader并没有什么区别，事实上在FileReader";		bw.write(s);		bw.flush();		osw.close();	}}

3.读并写入数据库

package com.test.readTxt;import java.io.BufferedReader;import java.io.File;import java.io.FileInputStream;import java.io.IOException;import java.io.InputStreamReader;import java.sql.Connection;import java.sql.DriverManager;import java.sql.PreparedStatement;public class ReadText {	public static void main(String[] args) throws IOException, Exception {		// TODO Auto-generated method stub		Connection conn = null;		Class.forName("oracle.jdbc.driver.OracleDriver");		conn = DriverManager.getConnection(				"jdbc:oracle:thin:@202.114.3.5:1521:YQDB", "YQDB_USER_HU",				"xwdb");		conn.setAutoCommit(false);		PreparedStatement pst = conn				.prepareStatement("insert into YQ_SENSITIVITY_KEY values(yq_seq_SENSITIVITY_KEY.nextval, ?,10,'seqing')");		InputStreamReader isr = new InputStreamReader(new FileInputStream(new File("C:/Users/xqbigbear/Desktop/敏感词汇大全 绝对够用/敏感词库/2012年最新敏感词列表/领导名人类.txt")), "gb2312");		BufferedReader read = new BufferedReader(isr);		String s = null;		int i = 1;		long start = System.currentTimeMillis();		while ((s = read.readLine()) != null) {			// 当数据满100条批量插入			if (i % 100 == 0) {				// 语句执行完毕，提交本事务				pst.executeBatch();				// 此处的事务回滚是必须的，网上很多代码没有处理，会导致插入数据不完整。				try {					conn.commit();				} catch (Exception e) {					conn.rollback();				}			} else {				s=s.substring(0,s.indexOf('='));				pst.setString(1, s);				pst.addBatch();			}			System.err.println(s);			i++;		}		// 由于每次达到100条插入，如果数据不为100的倍数的话，最后一次会剩下一些。下面的代码正好处理剩下的数据		// 语句执行完毕，提交本事务		pst.executeBatch();		try {			conn.commit();		} catch (Exception e) {			conn.rollback();		}		long end = System.currentTimeMillis();		// 此处是打印插入效果		System.out.println("插入" + i + "条，耗时" + (end - start) + "ms");		read.close();	}}