java读写文件

对于任何文件，不管有没有扩展名，都可以读写。切记，最后要.close();，否则效果出不来。

读操作：

package com.wjy.read;

import java.io.BufferedReader;
import java.io.File;
import java.io.FileInputStream;
import java.io.InputStreamReader;

public class FileReader {
    public void readContent(){
        String content=null;
        BufferedReader br=null;
        try {
            br = new BufferedReader(new InputStreamReader(new FileInputStream(new File("E:/svndemo/repository/conf/passwd"))));
            while ((content=br.readLine())!=null) {
                System.out.println(content);
            }   
            br.close();
        } catch (Exception e) {
            // TODO: handle exception
        }
        
    }
}

写操作；

package com.wjy.write;

import java.io.BufferedWriter;
import java.io.FileOutputStream;
import java.io.OutputStreamWriter;

public class FileWriter {

    public void writeContent(){
        BufferedWriter bw=null;
        try {
            bw=new BufferedWriter(new OutputStreamWriter(new FileOutputStream("E:/svndemo/repository/conf/authzz")));
              bw.write("xxx");
              bw.close();
            
        } catch (Exception e) {
            // TODO: handle exception
        }
        
    }

}
  

main函数：

package com.wjy.main;

import com.wjy.read.FileReader;
import com.wjy.write.FileWriter;

public class MainOption {
public static void main(String args[]){
//    TxtReader reader=new TxtReader();
//    reader.readContent();
    FileWriter writer=new FileWriter();
    writer.writeContent();
}
}