java文件操作--Thinking in java，
java文件操作--Thinking in java，
文件操作应该是JAVA最基础但是也是最重要的一部分了，下面奉上几个简单的例子
package com.bird.thinking;
import java.io.BufferedReader;
import java.io.FileReader;
/**
* @use 缓冲读取文件
* @author Bird
*
*/
public class BufferedInputFile {
public static String read(String FileName) throws Exception{
BufferedReader in = new BufferedReader(new FileReader(FileName));//设立缓冲区
String s = null;
StringBuilder sb = new StringBuilder();//尽量使用StringBuilder，迅速
while((s = in.readLine()) != null){
sb.append(s + "\n");
}
in.close();
return sb.toString();
}
public static void main(String [] args) throws Exception{
System.out.println(read("d://book.xml"));
}
}
package com.bird.thinking;
import java.io.BufferedReader;
import java.io.PrintWriter;
import java.io.StringReader;
/**
* @use 基本写文件操作
* @author Bird
*
*/
public class BasicFileOutput {
public static String file = "d://egg.java";
public static void main(String [] args) throws Exception{
BufferedReader in = new BufferedReader(new StringReader(BufferedInputFile.read("d://book.xml")));//构建输入对象
// PrintWriter out = new PrintWriter(new BufferedWriter(new FileWriter(file)));//构建输出对象
PrintWriter out = new PrintWriter(file);//快捷方式写法，仍然使用缓冲区
String s = null;
while((s = in.readLine()) != null){
out.write(s);
}
out.close();//一定要关闭刷新缓冲区，否则文件不完整
in.close();
}
}
package com.bird.thinking;
import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.DataInputStream;
import java.io.DataOutputStream;
import java.io.FileInputStream;
import java.io.FileOutputStream;
/**
* @use 使用Data写入读取数据，无论读写平台的不同
* @author Bird
*
*/
public class StoringAndRecoveringData {
@SuppressWarnings("deprecation")
public static void main(String [] args) throws Exception{
DataOutputStream out = new DataOutputStream(new BufferedOutputStream(new FileOutputStream("d://egg.xml")));
out.writeDouble(3.1415926);//使用二进制写入文件
out.writeUTF("Fall in Love");
out.writeInt(5);
out.close();
Thread.sleep(500);//避免磁盘未写入完毕
DataInputStream in = new DataInputStream(new BufferedInputStream(new FileInputStream("d://egg.xml")));
while(in.available() != 0){
System.out.println(in.readLine());
}
}
}
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