package logic;
import java.io.*;
import java.util.zip.*;
public class javaIOTest {
static final int BUFFER = 2048;
public static void main(String [] args) throws IOException
{
//格式化输入输出
/*
* 为了加强IO操作的性能，这里使用BufferedOutputStream/BufferedInputStream来进行缓冲，
* 其中必须有close()方法(当然，调用flush()方法也行)，否则缓冲区内容不能刷新清空
*/
System.out.println("------------------------DataOutputStream,DataInputStream,FileOutputStream,FileInputStream----------------------------------");
DataOutputStream d = new DataOutputStream(new BufferedOutputStream(new FileOutputStream("a.txt")));
d.writeDouble(3.414);
d.writeBoolean(false);
d.writeByte('1');
d.writeFloat((float) 2.22323);
d.writeUTF("That was PI");
d.close();
DataInputStream d2 = new DataInputStream (new BufferedInputStream(new FileInputStream("a.txt")));
System.out.println(d2.readDouble());
System.out.println(d2.readBoolean());
System.out.println(d2.readByte());
System.out.println(d2.readFloat());
System.out.println(d2.readUTF());
/*
* PrintStream是字节流，它有处理raw byte的方法
* PrintWriter是字符流，它没有处理raw byte的方法
*/
System.out.println("------------------------printStream----------------------------------");
PrintStream printStream = new PrintStream(new FileOutputStream(new File("pi.txt")));
printStream.print("PI = ");
printStream.println(Math.PI);
printStream.close();
System.out.println("------------------------PrintWriter----------------------------------");
PrintWriter printWriter=null;
try{
//初始化对象
printWriter=new PrintWriter(
new FileOutputStream("m.txt"));
printWriter.println("字符类型");//添加内容
printWriter.println(1.22);
printWriter.print("PI = ");
printWriter.println(Math.PI);
printWriter.flush();//刷新内存
}catch(Exception e){
e.printStackTrace();//用trycatch捕捉异常如有则输出产生异常错误所作
}
if(printWriter!=null)
try{
printWriter.close();
}catch(Exception e){}//判断对象不为空关闭
/*
* InputStreamReader 是字节流通向字符流的桥梁
*/
System.out.println("------------------------InputStreamReader----------------------------------");
System.out.println("Pls input :");
InputStreamReader isr = new InputStreamReader(System.in);
BufferedReader br = new BufferedReader(isr);
try
{
String inputLine = br.readLine();
System.out.println(inputLine);
}
catch(IOException ioe)
{
System.out.println("Error: "+ioe);
}
System.out.println("------------------------InputStreamReader,OutputStreamWriter----------------------------------");
System.out.println("按回车后再按Ctrl+z结束输入，可输入中文");
try
{
InputStreamReader isr1 = new InputStreamReader (new FileInputStream (FileDescriptor.in));
OutputStreamWriter osw = new OutputStreamWriter (new FileOutputStream ("output.log"));
int is;
while ((is=isr1.read()) != -1)osw.write(is);
isr1.close();
osw.close();
}
catch(FileNotFoundException e)
{
System.out.println(e);
}
catch(IOException e)
{
System.out.println(e);
}
catch(Exception e)
{
System.out.println(e);
}
System.out.println("------------------------StreamTokenizer----------------------------------");
try {
FileReader fr = new FileReader("simple.txt");
StreamTokenizer st = new StreamTokenizer(fr);
st.ordinaryChar('/');
while (st.nextToken() != StreamTokenizer.TT_EOF) {
if (st.ttype == StreamTokenizer.TT_NUMBER) {
System.out.println("數字:" + Double.toString(st.nval));
}
else if (st.ttype == StreamTokenizer.TT_WORD) {
System.out.println("字串:" + st.sval);
}
else {
System.out.println("其他:" + (char) st.ttype);
}
}
fr.close();
}
catch (Exception e) {
System.out.println("發生了" + e + "例外");
}
System.out.println("------------------------StringReader----------------------------------");
System.out.println(getUnicodeFromChar('我')); //将字符转换成unicode编码，测试“我”<->25105
System.out.println("------------------------StringWriter----------------------------------");
System.out.println(getCharFromUnicode(25105)); //将unicode编码转换成字符，测试25105<->“我”
System.out.println("------------------------zip----------------------------------");
try {
BufferedInputStream origin = null;
FileOutputStream dest = new
FileOutputStream("myfigs.zip");
ZipOutputStream out = new ZipOutputStream(new
BufferedOutputStream(dest));
//out.setMethod(ZipOutputStream.DEFLATED);
byte data[] = new byte[BUFFER];
// get a list of files from current directory
File f = new File(".");
String files[] = f.list();
for (int i=0; i < files.length; i++) {
System.out.println("Adding: "+files[i]);
System.out.println("aaa" + files.length);
FileInputStream fi = new
FileInputStream(files[i]);
origin = new
BufferedInputStream(fi, BUFFER);
ZipEntry entry = new ZipEntry(files[i]);
out.putNextEntry(entry);
int count;
while((count = origin.read(data, 0,
BUFFER)) != -1) {
out.write(data, 0, count);
}
origin.close();
}
out.close();
} catch(Exception e) {
e.printStackTrace();
}
}
// 将unicode编码转换成字符
public static char getCharFromUnicode(int unicode) {
StringWriter sw = new StringWriter();
sw.write(unicode);
return sw.getBuffer().charAt(0);
}
// 将字符转换成unicode编码
public static int getUnicodeFromChar(char ch) {
StringReader sr = new StringReader(new String(new char[] {ch}));
try {
return sr.read();
}
catch (Exception ex) {
System.out.println(ex.toString());
return -1;
}
}
}