JSR75 FileConnection Optional Package 使用方法

package forrest.fcop;

import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.Enumeration;

import javax.microedition.io.Connector;
import javax.microedition.io.file.FileConnection;
import javax.microedition.midlet.MIDlet;
import javax.microedition.midlet.MIDletStateChangeException;

public class MyFCOP extends MIDlet {
    private void visitByFileConnection(String url) {
        // 首先你必须检查选定的设备是否支持FileConnection
        if(System.getProperty("microedition.io.file.FileConnection.version") != null ) { // file.separator
            FileConnection fconn = null;
            try {
                fconn = (FileConnection) Connector.open(url, Connector.READ_WRITE);
                // Always check whether the file or directory exists.
                if (!fconn.exists()) {
                	fconn.mkdir();
                	((FileConnection) Connector.open("file:///root1/navi/a", Connector.READ_WRITE)).mkdir(); // 创建navi/a文件夹
                	((FileConnection) Connector.open("file:///root1/navi/b", Connector.READ_WRITE)).mkdir(); // 创建navi/b文件夹
                }
                if (fconn.isDirectory()) {
                    Enumeration names = fconn.list();
                    while (names.hasMoreElements()) {
                        String name = (String) names.nextElement();
                        System.out.println("navi下有 " + name + " Dictionary");
                    }
                } else {
                    System.out.println("Not a Directory");
                }
                
                url += "/log.txt";
                fconn = (FileConnection) Connector.open(url, Connector.READ_WRITE);
                if (!fconn.exists()) { // 创建txt文件，并写入文字
                    fconn.create();
                    if (!fconn.canWrite()) fconn.setWritable(true);
                    OutputStream out = fconn.openOutputStream();
                    out.write("欢迎访问".getBytes("utf-8"));
                    out.write("\n".getBytes());
                    out.write("贴心网".getBytes());
                    out.flush();
                    out.close();
                } else {
                	if (!fconn.canRead()) fconn.setReadable(true);
                	InputStream in = fconn.openInputStream();
                	byte[] b = new byte[1024];
                	in.read(b);
                	System.out.println("写出的文件为：" + new String(b, "utf-8").trim());
                	fconn.delete();
                }
            } catch (IOException ex) {
                ex.printStackTrace();
            } finally {
            	if (fconn != null) {
            		try {
    					fconn.close();
    				} catch (IOException e) {
    					e.printStackTrace();
    				}
    				fconn = null;
            	}
            }
        } else {
            System.out.println("FCOP not available");
        }
    }
    protected void startApp() throws MIDletStateChangeException {
    	String url = "file:///root1/navi";
        visitByFileConnection(url);
    }
    protected void pauseApp() {
    }
    protected void destroyApp(boolean unconditional) throws MIDletStateChangeException {
    }
}

 

评论

1 楼 wayfarer 2009-08-23  

文章描述了如果写txt文件，那么如何读取txt文件？

// 先将png.txt放入res中
InputStream in = getClass().getResourceAsStream("/png.txt");
int length = in.available(); // 部分手机上取得的值为0 
byte[] buf = new byte[length];
in.read(buf);

String txt_content = new String(buf, 0, length); //如有中文，用utf-8
System.out.println(txt_content);