新手java求解，关于文本文档的写入和读取。。

qq_21943455 2014-10-16 10:44:10

package sample;
import java.util.*;
import java.io.*;

public class Wenjian {

public static void main(String[] args) throws IOException {
// TODO Auto-generated method stub
double [] b=new double[5];
double [] d=new double[5];
System.out.println("请输入5个浮点数");
@SuppressWarnings("resource")
Scanner a=new Scanner(System.in);
for(int i=0;i<5;i++)
b[i]=a.nextDouble();
RandomAccessFile rand=new RandomAccessFile("D:\\aaa.txt","rw");
for(int i=0;i<b.length;i++)
rand.writeDouble(b[i]);
@SuppressWarnings("resource")
Scanner scanner=new Scanner(new FileInputStream("D:\\aaa.txt"));
while(scanner.hasNextDouble()){
for(int i=0;i<5;i++)
d[i]=scanner.nextDouble();}
Arrays.sort(d);
for(int i=d.length-1;i>0;i--)
System.out.print(" "+d[i]);
for(int i=0;i<d.length;i++)
rand.writeDouble(d[i]);
rand.close();
}

}

rand.writeDouble(b[i]);
就是这句为什么写入之后都是乱码。求大神讲解下

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qzw1210 2014-10-16

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while(rand.getFilePointer()>0){
                 System.out.println( new String(rand.readLine().getBytes("ISO-8859-1"), "gb2312")); //gb2312是你文本编码格式。    
 
        }

这段代码要放开

qq_21943455 2014-10-16

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引用 7 楼 qu1210 的回复:

读文件乱码是因为在RandomAccessFile下用readLine的方式会自动将编码变成ISO-8859-1。所以只要按照如下方式即可 RandomAccessFile fl=new RandomAccessFile(file,"rw"); while(fl.getFilePointer() System.out.println( new String(fl.readLine().getBytes("ISO-8859-1"), "gb2312")); //gb2312是你文本编码格式。 } 使用RandomAccessFile向数据库写入中文的时候， *使用write(String.getBytes()), 能够正常写入 *使用writeBytes(String), writeChars(String), writeUTF(String)均产生乱码。
import java.util.*;
import java.io.*;

public class Wenjian {

	public static void main(String[] args) throws IOException {
		// TODO Auto-generated method stub
		double[] b = new double[5];
		double[] d = new double[5];
		System.out.println("请输入5个浮点数");
		@SuppressWarnings("resource")
		Scanner a = new Scanner(System.in);
		for (int i = 0; i < 5; i++)
			b[i] = a.nextDouble();
		RandomAccessFile rand = new RandomAccessFile("D:\\aaa.txt", "rw");
		/*while(rand.getFilePointer()>0){
			     System.out.println( new String(rand.readLine().getBytes("ISO-8859-1"), "gb2312")); //gb2312是你文本编码格式。    

		}*/
		for (int i = 0; i < b.length; i++){
			System.out.println(b[i]);
			rand.write((b[i]+"").getBytes());
			rand.writeBytes(" ");
		}
		@SuppressWarnings("resource")
		Scanner scanner = new Scanner(new FileInputStream("D:\\aaa.txt"));
		while (scanner.hasNextDouble()) {
			for (int i = 0; i < 5; i++)
				d[i] = scanner.nextDouble();
		}
		Arrays.sort(d);
		for (int i = d.length - 1; i > 0; i--)
			System.out.print(" " + d[i]);
		for (int i = 0; i < d.length; i++)
			rand.writeDouble(d[i]);
		rand.close();
	}

}

受教了！

qzw1210 2014-10-16

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读文件乱码是因为在RandomAccessFile下用readLine的方式会自动将编码变成ISO-8859-1。所以只要按照如下方式即可

RandomAccessFile fl=new RandomAccessFile(file,"rw");
while(fl.getFilePointer()
System.out.println( new String(fl.readLine().getBytes("ISO-8859-1"), "gb2312")); //gb2312是你文本编码格式。

}

使用RandomAccessFile向数据库写入中文的时候，

*使用write(String.getBytes()), 能够正常写入

*使用writeBytes(String), writeChars(String), writeUTF(String)均产生乱码。



import java.util.*;

import java.io.*;



public class Wenjian {



	public static void main(String[] args) throws IOException {

		// TODO Auto-generated method stub

		double[] b = new double[5];

		double[] d = new double[5];

		System.out.println("请输入5个浮点数");

		@SuppressWarnings("resource")

		Scanner a = new Scanner(System.in);

		for (int i = 0; i < 5; i++)

			b[i] = a.nextDouble();

		RandomAccessFile rand = new RandomAccessFile("D:\\aaa.txt", "rw");

		/*while(rand.getFilePointer()>0){

			     System.out.println( new String(rand.readLine().getBytes("ISO-8859-1"), "gb2312")); //gb2312是你文本编码格式。    



		}*/

		for (int i = 0; i < b.length; i++){

			System.out.println(b[i]);

			rand.write((b[i]+"").getBytes());

			rand.writeBytes(" ");

		}

		@SuppressWarnings("resource")

		Scanner scanner = new Scanner(new FileInputStream("D:\\aaa.txt"));

		while (scanner.hasNextDouble()) {

			for (int i = 0; i < 5; i++)

				d[i] = scanner.nextDouble();

		}

		Arrays.sort(d);

		for (int i = d.length - 1; i > 0; i--)

			System.out.print(" " + d[i]);

		for (int i = 0; i < d.length; i++)

			rand.writeDouble(d[i]);

		rand.close();

	}



}