Reader和Writer代表字符输入流和字符输出流，它们读写是以字符为单位的，但在处理字符信息量比较多，性能较低。BufferedReader和BufferedWriter是对字符输入流和字符输出流包装，其内置缓冲区，允许一次读写一行，既提高了性能也带来了编程的方便，实际我们在字符IO处理时，使用这两个类场景比较多。常用方法列举如下：
String readLine();从流中读取一行字符，以\n作为行标记
writer(String);将字符串输出到目标流中。
newline();将换行符\n输出到目标字符流中。
示例1代码：
public class TestBufferedWriter{
public static void main(String[] args) {
Writer writer = null;
BufferedWriter bw=null;
try {
writer = new FileWriter("rw.txt");
bw=new BufferedWriter(writer);
bw.write("字符包装流");
bw.newLine();
bw.write("字符包装流");
bw.newLine();
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
} finally {
if (bw != null) {
try {
bw.flush();
bw.close();
} catch (IOException e) {
e.printStackTrace();
}
}
if (writer != null) {
try {
writer.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
}
}
示例2代码：
public class TestReader{
public static void main(String[] args) {
Reader reader = null;
BufferedReader br=null;
try {
reader = new FileReader("rw.txt");
br=new BufferedReader(reader);
String line=null;
while((line=br.readLine())!=null){
System.out.println(line);
}
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
} finally {
if (br != null) {
try {
br.close();
} catch (IOException e) {
e.printStackTrace();
}
}
if (reader != null) {
try {
reader.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
}
}
