FileOutputStream读取文件夹时出错

[wangwffgqeg]

FileOutputStream fi = new FileOutputStream("C:\\test");
如果 C:\\test是文件夹时就会出现异常:
java.io.FileNotFoundException: E:\snake (拒绝访问。)
at java.io.FileOutputStream.open(Native Method)
at java.io.FileOutputStream.<init>(Unknown Source)
at java.io.FileOutputStream.<init>(Unknown Source)
at test_1.FileChannelTest.main(FileChannelTest.java:25)
这个问题怎么解决呀。怎么才能和文件夹建硫呀。

[梦_枫]

哪有和文件夹建流的啊，，，，

[cwjieNo1]

C:\\test是文件夹时就会出现异常:
这个只能读取文件啊，文件夹怎么可以读取啊

[hui135]

public FileOutputStream(String name)
throws FileNotFoundExceptionCreates an output file stream to write to the file with the specified name. A new FileDescriptor object is created to represent this file connection.
First, if there is a security manager, its checkWrite method is called with name as its argument.

If the file exists but is a directory rather than a regular file, does not exist but cannot be created, or cannot be opened for any other reason then a FileNotFoundException is thrown.
这里说得很清楚了啊！

[hui135]

Creates an output file stream to write to the file with the specified name
这里

[duiduiaa]

考 不能是文件夹！！！！！如果想读文件夹中的所有文件， 需要判断是否是文件夹，然后读子文件和文件


对于文件，用流读取，对于文件夹调用本身，一个递归函数。

[YouLoveApple]

可以先用File f=new File("c:\\test");if(f.isFile())如果是TRUE就直接使用FileInputStream建立流，否则就是一个问价夹了。

[liguang168]

楼上已经有答案了。回复内容太短了！

[wanbosen]

读取一个文件要这么多东西， 我天儿，学习中。。。。。。

[哈特中尉]

文件夹怎么读呢？读的是文件啊~！虽然file在Java中指的是文件和文件夹！

字符的写入和读取:

package IO;

import java.io.BufferedReader;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;
import java.io.Reader;
/**
 * 
 *用read和write实现文件的写入和读取(字符的写入和读取)
 *
 */
public class ReadAndWrite {
	//定义文件的路径，一边写入和读取使用
	String path="e:\\abc.txt";
	
	public static void main(String[] args) {
		ReadAndWrite r=new ReadAndWrite ();
		r.writeFile("我乃邪恶少年是也！");
		r.readFile();
	}
	private void readFile() {
		// TODO Auto-generated method stub
		try {
			Reader r=new BufferedReader (new FileReader(path));
			String test="";
			int temp=0;
			try {
				while ((temp=r.read())!=-1) {
					test+=(char)temp;
				}
				System.out.println(test);
			} catch (IOException e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			}
		} catch (FileNotFoundException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
	}
	private void writeFile(String content) {
		// TODO Auto-generated method stub
		File f=new File (path);
		if (f.exists()==false) {
			try {
				f.createNewFile();
				FileWriter fw=new FileWriter (f);
				fw.write(content);
				fw.flush();
				fw.close();
			} catch (IOException e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			}
			
		}else {
			System.out.println(path+"已存在,写入失败,源文件是");
		}
	}
}

字节的写入和读取:

package IO;

import java.io.BufferedInputStream;
import java.io.BufferedReader;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
/**
 * test.getBytes("iso8859-1"))
 * 用OutputStream和InputStream实现文件的写入和读取(字节的写入和读取)
 *
 */
public class InAndOut {
	String path="e:\\abc.txt";
	public static void main(String[] args) {
		InAndOut io=new InAndOut ();
		io.write("我是邪恶少年!");
		io.read();
	}
	public void write(String content)
	{
		File f=new File (path);
		boolean add=true;//是否写入
		try {
			if (f.exists()==false) {
				f.createNewFile();
				FileOutputStream os=new FileOutputStream (f);//不用判断是否写入
				//FileOutputStream os=new FileOutputStream (f,add);//要判断是否写入
				os.write(content.getBytes());
				os.flush();
				os.close();
			}
		} catch (IOException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
	}
	public void read()
	{
		try {
			InputStream is=new FileInputStream(path);
			//BufferedInputStream bis=new BufferedInputStream(new FileInputStream(path));
			int temp=0;
			String test="";
			try {
				while ((temp=is.read())!=-1) {
					test+=(char)temp;
				}
				System.out.println(new String (test.getBytes("iso8859-1")));//会出现乱码
			} catch (IOException e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			}
		} catch (FileNotFoundException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
	}
}