add io file

ctalk/src/com/db/letdb/file/InWrite.java

@@ -0,0 +1,50 @@
+package com.db.letdb.file;
+
+import java.io.BufferedReader;
+import java.io.BufferedWriter;
+import java.io.File;
+import java.io.FileReader;
+import java.io.FileWriter;
+import java.io.IOException;
+
+/**
+ * @created: 2011-11-16
+ * @author : jias chao<[email protected]>
+ */
+public class InWrite {
+
+	private String path = "";
+	private String fileName="";
+	private BufferedReader read;
+	private BufferedWriter write;
+
+	public static int indexOfLine = 0;
+
+	public InWrite(String _fileName) throws IOException{
+		this.fileName = _fileName;
+		openFile();
+	}
+
+	public void openFile() throws IOException{
+		File file = new File(this.fileName);
+		if (!file.exists()){
+			file.createNewFile();
+		}
+		FileReader fr = new FileReader(file);
+		FileWriter fw = new FileWriter(file,true);
+		read = new BufferedReader(fr);
+		write = new BufferedWriter(fw);
+	}
+
+	public void write(String context) throws IOException{
+		write.write(context);
+		write.newLine();
+		write.flush();
+	}
+
+	public String readNextLine() throws IOException{
+		read.skip(indexOfLine);
+		indexOfLine = indexOfLine + 5;
+		return read.readLine();
+	}
+}

ctalk/test/com/db/letdb/file/TestInWrite.java

@@ -0,0 +1,36 @@
+package com.db.letdb.file;
+
+import static org.junit.Assert.*;
+
+import java.io.IOException;
+
+import org.junit.Test;
+
+/**
+ * @created: 2011-11-16
+ * @author : jias chao<[email protected]>
+ */
+public class TestInWrite {
+
+	@Test
+	public void test() {
+		fail("Not yet implemented");
+	}
+
+	@Test
+	public void testWrite() throws IOException{
+		InWrite iw = new InWrite("context.txt");
+		iw.write("abc");
+		iw.write("123");
+
+	}
+
+	@Test
+	public void testRead() throws IOException{
+		InWrite iw = new InWrite("context.txt");
+		String str = iw.readNextLine();
+			System.out.print(str);
+
+	}
+
+}