读取内存卡的文件方法

读取内存卡的文件方法 J2ME读取手机内存卡里的文本文件.txt【原创】 2009-04-01 15:47 /* * To change this template, choose Tools | Templates * and open the template in the editor. * 2009-03-19 10:12 */ package Forms; import java.io.ByteArrayOutputStream; import java.io.IOException; import java.io.InputStream; import javax.microedition.io.Connection; import javax.microedition.io.Connector; import javax.microedition.io.file.FileConnection; /** * * 专门用来读取内存卡里的.txt文件 * @author Acheng */ public class ReadTextForm implements Runnable { /** * 文件路径 */ private String ref = null; /** * 读文件的线程 */ private Thread readThread; /** * 用来保存读取到的文本 */ private String s = null; public ReadTextForm() { } /** * 启动该线程 * @param ref 要读取的文件路径，比如读取内存卡里的help_en.txt文件 路径:"file://localhost/e:/SmartMacau/main/help_en.txt" */ public void startThread( String ref ) { this.ref = ref; if( readThread != null ) { readThread = null; } readThread = new Thread( this ); readThread.start(); } public void run() { InputStream in = null; Connection conn = null; ByteArrayOutputStream baos = null; if( ref.startsWith( "file:" ) )//读内存卡里的文件 { try { conn = ( FileConnection ) Connector.open( ref ); in = ( ( FileConnection ) conn ).openInputStream(); // in.skip( 2 ); baos = new ByteArrayOutputStream(); int ch = 0; while( ( ch = in.read() ) != -1 ) { baos.write( ch ); } byte[] tmp = baos.toByteArray(); //UTF-8编码,中文时,文件开头是框框,英文不会出现这个情 况 s = new String( tmp, "UTF-8" ); //跳过文件开头的框框 if( tmp[0] == -17 && tmp[1] == -69 && tmp[2] == -65 ) { s = s.substring( 1 ); } // String s = new String(baos.toString().getBytes("ISO8859_1"),"GBK");//乱码 // String s = new String(baos.toString().getBytes("ISO8859_1"),"UTF-8");//文件开头是框 框 // String s = baos.toString();//乱码 // String s = new String( tmp); } catch( IOException ex ) { ex.printStackTrace(); } finally { if( baos != null ) { try { baos.close(); } catch( IOException ex ) { ex.printStackTrace(); } baos = null; } if( in != null ) { try { in.close(); } catch( IOException ex ) { ex.printStackTrace(); } in = null; } if( conn != null ) { try { conn.close(); } catch( IOException ex ) { ex.printStackTrace(); } conn = null; } } } else { System.out.println( "ReadTextForm 路径有问题:" ); System.out.println( "Readurl::" + ref ); } } /** * 获取读取到的文本 */ public String getText() { return s; } }