Java IO 输入输出流 实例解释

package IO;
/*
* Java In Out 输入输出流
* Date:2014.02.21
* Author:璀若星辰
*reference
* */
import java.io.BufferedInputStream;
import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;
import java.util.ArrayList;
import java.util.List;

/*主要操作的内容：
* 1.字节流： 图片，     2.字符流  （字符文件 .html .java .txt）
*
*
* */
public class testIO {
//读 字符输入流
public static List<String>testCharInput() throws Exception {
FileInputStream fis = new FileInputStream("D:/1.txt");
try {
InputStreamReader isr = new InputStreamReader(fis, "gb2312");
try{
BufferedReader br = new BufferedReader(isr);
try{
List<String> all = new ArrayList<String>();
String temp = br.readLine();
while(temp!=null) {
System.out.println("temp="+temp);
all.add(temp);
System.out.println("all= "+all);
temp= br.readLine();
}
return all;
}finally{
br.close();
}
}finally{
isr.close();
}
} finally{
fis.close();
}

}
// 读 字节流
public static void testByteInputStream() throws Exception {
FileInputStream fis = new FileInputStream("D:/1.txt");
try {
BufferedInputStream bis = new BufferedInputStream(fis);
try {
byte[] bs = new byte[1024];  //1024的长度可改
while (bis.read(bs, 0, 1024) != -1) {
System.out.print("bs="+new String(bs));
}
} finally {
bis.close();
}
} finally {
fis.close();
}

}
//写 字符流
public static void testCharOutput(List<String>list) throws Exception{
FileOutputStream fos = new FileOutputStream("d:/1.txt");
try{
OutputStreamWriter osw = new OutputStreamWriter(fos,"utf-8");//文件的编码
try{
BufferedWriter bw = new BufferedWriter(osw);
try{
for(String line:list){
bw.write(line);
bw.newLine();//使用newLine()换行  \n
}
System.out.println("success");
}finally{
bw.close();
}
}finally{
osw.close();
}
}finally{
fos.close();
}
}
public static void main(String[] args) throws Exception {
//testIO.testCharInput();
//testIO.testByteInputStream();
ArrayList<String> list = new ArrayList<String>();
list.add("Happy");
list.add("Boy");
testIO.testCharOutput(list);
testIO.testByteInputStream();
}
//写入内容时不想删除原来的文本，可以先读出来保存下来，然后和新内容一起写入文本，此处不再赘述
}