Java流读写数据
一个比较复杂的情况是流中的数据类型各不相同，可能是A+B+C，对A,B,C的读写处理是A,B,C的类型来决定。
1>在往流中写入数据之前要写入数据的类型,
2>从流中读数据的时候也要先判断数据类型
private int readInt(InputStream in) throws IOException { int ch1 = in.read(); int ch2 = in.read(); int ch3 = in.read(); int ch4 = in.read(); if ((ch1 | ch2 | ch3 | ch4) < 0) throw new EOFException(); return ((ch1 << 24) + (ch2 << 16) + (ch3 << 8) + (ch4 << 0)); } private byte readByte(InputStream in) throws IOException { int b = in.read(); if(b < 0) throw new EOFException(); return (byte)b; } private String readString(InputStream in) throws IOException { int len = readInt(in); byte b[] = new byte[len]; int l = 0; while(l < len) l += in.read(b, l, len - l); return new String(b); } private void writeInt(OutputStream out, int v) throws IOException { out.write((v >>> 24) & 0xFF); out.write((v >>> 16) & 0xFF); out.write((v >>> 8) & 0xFF); out.write((v >>> 0) & 0xFF); } private void writeString(OutputStream out, String v) throws IOException { byte[] b = v.getBytes(); writeInt(out, b.length); out.write(b); }