读取文件内容

import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
public class InputStreamTest {
    public static void main(String[] args) throws IOException {
        InputStream in = null;
        try{
            in = new FileInputStream(".\\src\\test.txt");
            StringBuilder sb = new StringBuilder();
            int n;
            while((n=in.read())!=-1){
                sb.append((char)n);
            }
            System.out.println(sb.toString());
        }finally {
            if(in != null) {
                in.close();
            }
        }
    }
}