Java FileConnection.create方法代码示例

import javax.microedition.io.file.FileConnection; //导入方法依赖的package包/类
public static void dumpRMS (String pathPrefix) {
    if (pathPrefix == null)
        pathPrefix = DUMP_PATH_PREFIX_DEFAULT;
    String filepath = dumpFilePath(pathPrefix);

    try {
        FileConnection fc = (FileConnection)Connector.open("file:///" + filepath);
        if (fc.exists()) {
            System.err.println("Error: File " + filepath + " already exists");
            fail("Dump file " + filepath + " already exists");
        }

        fc.create();
        DataOutputStream out = fc.openDataOutputStream();

        dumpRMS(out);

        fc.close();
    } catch (IOException ioe) {
        fail(ioe, "ioexception");
    }
}
 

import javax.microedition.io.file.FileConnection; //导入方法依赖的package包/类
void generateData() throws IOException {
    String str = "";
    String part = "abcdefghilmnopqrstuvzABCDEFGHILMNOPQRSTUVZabcdefghilmnopqrstuvzABCDEFGHILMNOPQRSTUVZ";
    for (int i = 0; i < 2000; i++) {
      str += part;
    }

    cbuf = new char[str.length()];
    cbufReader = new char[cbuf.length];
    str.getChars(0, str.length(), cbuf, 0);

    String dirPath = System.getProperty("fileconn.dir.private");
    file = (FileConnection)Connector.open(dirPath + "test");
    if (file.exists()) {
        file.delete();
    }
    file.create();
}
 

import javax.microedition.io.file.FileConnection; //导入方法依赖的package包/类
public void startApp() {
    System.out.println("START - Background alarm started: " + startedBackgroundAlarm());

    receiveSMS();

    try {
        FileConnection file = (FileConnection)Connector.open("file:////startBackgroundService");
        if (!file.exists()) {
            file.create();
        }
        file.close();
    } catch (IOException e) {
        System.out.println("Unexpected exception: " + e);
        return;
    }

    System.out.println("DONE - Background alarm started: " + startedBackgroundAlarm());
}
 

import javax.microedition.io.file.FileConnection; //导入方法依赖的package包/类
/**
 * create() creates a new file
 */
public void test0001() {
	boolean passed = false;
	try {
		FileConnection conn = (FileConnection)Connector.open("file://"+getTestPath()+"test", Connector.READ_WRITE);
		try {
			addOperationDesc("Deleting file: " + conn.getURL());
			ensureNotExists(conn);
			
			addOperationDesc("Creating file");
			conn.create();

			boolean exists = conn.exists();
			addOperationDesc("exists() returned " + exists);
			
			passed = exists==true;
		} finally {
			conn.close();
		}
	} catch (Exception e) {
		logUnexpectedExceptionDesc(e);
		passed = false;
	}

	assertTrueWithLog("create() creates a new file", passed);
}
 

import javax.microedition.io.file.FileConnection; //导入方法依赖的package包/类
/**
 * @inheritDoc
 */
public OutputStream openOutputStream(Object connection) throws IOException {
    if(connection instanceof String) {
        FileConnection fc = (FileConnection)Connector.open((String)connection, Connector.READ_WRITE);
        if(!fc.exists()) {
            fc.create();
        }
        BufferedOutputStream o = new BufferedOutputStream(fc.openOutputStream(), (String)connection);
        o.setConnection(fc);
        return o;
    }
    return new BufferedOutputStream(((HttpConnection)connection).openOutputStream(), ((HttpConnection)connection).getURL());
}
 

import javax.microedition.io.file.FileConnection; //导入方法依赖的package包/类
/**
 * @inheritDoc
 */
public OutputStream openOutputStream(Object connection) throws IOException {
    if (connection instanceof String) {
        FileConnection fc = (FileConnection) Connector.open((String) connection, Connector.READ_WRITE);
        if (!fc.exists()) {
            fc.create();
        }
        BufferedOutputStream o = new BufferedOutputStream(fc.openOutputStream(), (String) connection);
        o.setConnection(fc);
        return o;
    }
    OutputStream os = new BlackBerryOutputStream(((HttpConnection) connection).openOutputStream());
    return new BufferedOutputStream(os, ((HttpConnection) connection).getURL());
}
 

import javax.microedition.io.file.FileConnection; //导入方法依赖的package包/类
void runBenchmark() {
    try {
        long start;

        String dirPath = System.getProperty("fileconn.dir.private");
        FileConnection file = (FileConnection)Connector.open(dirPath + "test");
        if (file.exists()) {
            file.delete();
        }
        file.create();

        OutputStream fileOut = file.openOutputStream();
        start = JVM.monotonicTimeMillis();
        writeUTF(fileOut);
        System.out.println("DataOutputStream::writeUTF in file: " + (JVM.monotonicTimeMillis() - start));

        InputStream fileIn = file.openInputStream();
        start = JVM.monotonicTimeMillis();
        readUTF(fileIn);
        System.out.println("DataInputStream::readUTF from file: " + (JVM.monotonicTimeMillis() - start));

        file.close();
    } catch (IOException e) {
        System.out.println("Unexpected exception: " + e);
        e.printStackTrace();
    }
}
 

import javax.microedition.io.file.FileConnection; //导入方法依赖的package包/类
protected void ensureFileExists(FileConnection conn) throws IOException {
	if (conn.exists()) {
		// if the file already exists, delete it to ensure zero length when created again
		recursiveDelete(conn);
	}
	
	try {
		conn.create();
	} catch (Exception e) {
		throw new IOException("could not create file <" + conn.getURL() + "> (" + e.getMessage() + ")");
	}
}
 

import javax.microedition.io.file.FileConnection; //导入方法依赖的package包/类
public static boolean save(byte[] bytes, String filename) {
    String path = "file://";
    if (DeviceMemory.useSDCard() && !DeviceMemory.forceInternalMemory) {
        path += "/SDCard/vika/";
    } else {
        path += "/store/home/user/vika/";
    }

    boolean result = DeviceMemory.makeDirectory(path);

/*
 * if (!result && useSDCard() && !forceInternalMemory) { forceInternalMemory = true; return
 * save(bytes, filename); }
 */

    if (!result) {
        return false;
    }

    path += filename;

    try {
        FileConnection fc = (FileConnection) Connector.open(path, Connector.READ_WRITE);
        if (!fc.exists()) {
            fc.create();
        }

        OutputStream out = fc.openOutputStream();
        out.write(bytes);
        out.close();
        fc.close();

        return true;
    } catch (IOException e) {
        return false;
    }
}
 

import javax.microedition.io.file.FileConnection; //导入方法依赖的package包/类
void runBenchmark() {
  try {
      long start, time = 0;

      client = (LocalMessageProtocolConnection)Connector.open("localmsg://nokia.image-processing");

      DataEncoder dataEncoder = new DataEncoder("Conv-BEB");
      dataEncoder.putStart(14, "event");
      dataEncoder.put(13, "name", "Common");
      dataEncoder.putStart(14, "message");
      dataEncoder.put(13, "name", "ProtocolVersion");
      dataEncoder.put(10, "version", "1.[0-10]");
      dataEncoder.putEnd(14, "message");
      dataEncoder.putEnd(14, "event");
      byte[] sendData = dataEncoder.getData();
      client.send(sendData, 0, sendData.length);

      LocalMessageProtocolMessage msg = client.newMessage(null);
      client.receive(msg);

      FileConnection originalImage = (FileConnection)Connector.open("file:////test.jpg", Connector.READ_WRITE);
      if (!originalImage.exists()) {
          originalImage.create();
      }
      OutputStream os = originalImage.openDataOutputStream();
      InputStream is = getClass().getResourceAsStream("/org/mozilla/io/test.jpg");
      os.write(TestUtils.read(is));
      os.close();

      MemorySampler.sampleMemory("Memory before nokia.image-processing benchmark");
      for (int i = 0; i < 1000; i++) {
        start = JVM.monotonicTimeMillis();
        String path = scaleImage();
        time += JVM.monotonicTimeMillis() - start;

        FileConnection file = (FileConnection)Connector.open(path);
        file.delete();
        file.close();
      }
      System.out.println("scaleImage: " + time);
      MemorySampler.sampleMemory("Memory after nokia.image-processing benchmark");

      originalImage.delete();
      originalImage.close();

      client.close();
  } catch (IOException e) {
    e.printStackTrace();
  }
}
 

import javax.microedition.io.file.FileConnection; //导入方法依赖的package包/类
/**
 * Opens the {@link FileConnection} and a {@link PrintStream}.
 * 
 * @param filenamePrefix prefix of the filename part of the file path.
 * @param append if <code>true</code> then don't use timestamp in the filename but append to existing log file.
 * @throws IOException if a file could not be created.
 * @throws SecurityException if no permission was given to create a file.
 * @throws NullPointerException if <code>filenamePrefix</code> is <code>null</code>.
 */
private static void openFileConnection(String filenamePrefix, boolean append) 
    throws IOException, SecurityException 
{
    if (!System.getProperty("microedition.io.file.FileConnection.version").equals("1.0")) {
        // FileConnection API version 1.0 isn't supported.
        // Probably a bit unnecessary check as if it isn't supported
        // a ClassNotFoundException would have been thrown earlier.
        throw new IOException("FileConnection not available");
    }
    
    final String filename = createLogFilename(filenamePrefix, !append);
    final String[] pathProperties = {"fileconn.dir.memorycard", "fileconn.dir.recordings"};
    String path = null;
    
    // Attempt to create a file to the directories specified by the 
    // system properties in array pathProperties.
    for (int i = 0; i < pathProperties.length; i++) {
        path = System.getProperty(pathProperties[i]);
        
        // Only throw declared exceptions if this is the last path
        // to try.
        try {
            
            if (path == null) {
                
                if (i < (pathProperties.length - 1)) {
                    continue;
                } else {
                    throw new IOException("Path not available: " + pathProperties[i]);
                }
            }

            FileConnection fConn = (FileConnection) 
                Connector.open(path + filename, Connector.READ_WRITE);
            OutputStream os = null;
            
            if (append) {

                if (!fConn.exists()) {
                    fConn.create();
                }
                
                os = fConn.openOutputStream(fConn.fileSize());
            } else {
                // Assume that createLogFilename creates such a filename
                // that is enough to separate filenames even if they
                // are created in a short interval (seconds).
                fConn.create();
                os = fConn.openOutputStream();
            }
            
            streams[FILE_INDX] = new PrintStream(os);
            
            // Opening the connection and stream was successful so don't
            // try other paths.
            fileConn = fConn;
            break;
        } catch (SecurityException se) {
            if (i == (pathProperties.length - 1)) {
                throw se;
            }
        } catch (IOException ioe) {
            if (i == (pathProperties.length - 1)) {
                throw ioe;
            }                
        }
    }
}
 

import javax.microedition.io.file.FileConnection; //导入方法依赖的package包/类
public void test(TestHarness th) {
    try {
        FileConnection file = (FileConnection)Connector.open("file:////prova");
        if (file.exists()) {
            file.delete();
        }
        file.create();

        RandomAccessStream ras = new RandomAccessStream();
        ras.connect("prova", Connector.READ_WRITE);

        OutputStream out = ras.openOutputStream();

        testWrite(th, out);

        out.close();

        ras.setPosition(0);

        InputStream in = ras.openInputStream();

        testRead(th, in);

        in.close();

        ras.disconnect();

        file.delete();
        th.check(!file.exists());
        file.create();

        out = file.openOutputStream();
        testWrite(th, out);
        out.close();
        in = file.openInputStream();
        testRead(th, in);
        in.close();

        file.delete();
        file.close();
    } catch (Exception e) {
        th.fail("Unexpected exception: " + e);
        e.printStackTrace();
    }
}