InputStream只能读一遍
InputStream在被读出后，在下次读取的时候会出现null。因此在下次读取或者利用InputStream的时候要把它写回去。import java.io.BufferedReader;import java.io.ByteArrayInputStream;import java.io.File;import java.io.FileInputStream;import java.io.IOException;import java.io.InputStream;import java.io.InputStreamReader;public class Reader {public static void main(String[] args) throws IOException{InputStream in = new FileInputStream(new File("text.txt"));BufferedReader reader = new BufferedReader(new InputStreamReader(in));String str = null;StringBuffer sb = new StringBuffer();while((str = reader.readLine())!=null){System.err.println(str);sb.append(str);}ByteArrayInputStream bis = new ByteArrayInputStream(sb.toString().getBytes());BufferedReader reader2 = new BufferedReader(new InputStreamReader(bis));String str2 = null;while((str2 = reader2.readLine())!=null){System.out.println(str2);}}}
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