前面所举例的InputStream，OutputStream，是针对字节流进行操作的。
FileReader，FileWriter是针对字符流进行操作的。
另外在写入的时候并未提供编码格式，极易造成中文乱码。
InputStreamReader/OutputStreamWriter，为字节流与字符流的转换提供了途径。
实例一：读取每个字节转为char
@Test
public void testInputStreamReader(){
BufferedReader br = null;
BufferedWriter bw = null;
try {
//此时文件是在项目下，即contextPath/
File file = new File("test1.txt");
File file1 = new File("test2.txt");
//输入流
InputStream in = new FileInputStream(file);
//输入转换器
InputStreamReader iReader = new InputStreamReader(in, "UTF-8");
// 输出流
OutputStream out = new FileOutputStream(file1);
//输出转换器
OutputStreamWriter osw = new OutputStreamWriter(out, "UTF-8");
//缓冲包装
br = new BufferedReader(iReader);
bw = new BufferedWriter(osw);
byte[] c = new byte[1024];
int len;
while((len = br.read())!= -1){
System.out.println("ASCII："+len+","+"vlaue :"+(char)len);
bw.write(len);
}
}catch (IOException e) {
e.printStackTrace();
}finally{
if(bw != null){
try {
bw.close();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
if(br != null){
try {
br.close();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
}实例二：读入到字符数组
@Test
public void testInputStreamReader(){
BufferedReader br = null;
BufferedWriter bw = null;
try {
//此时文件是在项目下，即contextPath/
File file = new File("test1.txt");
File file1 = new File("test2.txt");
//输入流
InputStream in = new FileInputStream(file);
//输入转换器
InputStreamReader iReader = new InputStreamReader(in, "UTF-8");
// 输出流
OutputStream out = new FileOutputStream(file1);
//输出转换器
OutputStreamWriter osw = new OutputStreamWriter(out, "UTF-8");
//缓冲包装
br = new BufferedReader(iReader);
bw = new BufferedWriter(osw);
/*读入到字符数组*/
char[] c = new char[1024];
int len;
while((len = br.read(c))!= -1){
System.out.println("字符长度："+len);
String str = new String(c, 0, len);
System.out.print(str);
bw.write(c, 0, len);
}
}catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}finally{
if(bw != null){
try {
bw.close();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
if(br != null){
try {
br.close();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
}实例三：每次读取一行
@Test
public void testInputStreamReader(){
BufferedReader br = null;
BufferedWriter bw = null;
try {
//此时文件是在项目下，即contextPath/
File file = new File("test1.txt");
File file1 = new File("test2.txt");
//输入流
InputStream in = new FileInputStream(file);
//输入转换器
InputStreamReader iReader = new InputStreamReader(in, "UTF-8");
// 输出流
OutputStream out = new FileOutputStream(file1);
//输出转换器
OutputStreamWriter osw = new OutputStreamWriter(out, "UTF-8");
//缓冲包装
br = new BufferedReader(iReader);
bw = new BufferedWriter(osw);
/*每次读取一行*/
String str;
while((str = br.readLine()) != null){
System.out.println(str);
bw.write(str + "\n");
bw.newLine();
bw.flush();
}
}catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}finally{
if(bw != null){
try {
bw.close();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
if(br != null){
try {
br.close();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
}
