java之IO节点流示例，其他情况举一反三都是类似的

-I/O流的一般操作流程：-创建或者选择数据源-选择I/O流-创建操作对象-创建读取or存储的缓存区-具体操作，写入，读取，转换等等-**出现乱码原因**：字节转字符，**字节数不够**，导致乱码；**编码不一致**导致乱码-注意事项-`FileInput/OutputStream`最适合用于操作非文本文件（如图片、视频等）-`FileReader/Writer`最适合用于操作文本文件（如txt文件）-`BufferStream`可以加速节点流操作文件的速度```*抽象基类节点流（文件流）缓冲流字节流*InputStreamFileInputStreamBufferedInputStream*OutputStreamFileOutputStreamBufferedOutputStream字符流*ReaderFileReaderBufferedReader*WriterFileWriterBufferedWriter```-示例：文件<----->字节流：`BufferedInputStream(newFileInputStream(src))`----->`ByteArrayOutputStream`;  `ByteArrayInputStream`---->`newBufferedOutputStream(newFileOutputStream(dest)`-示例：```java/**文件转字节流*/publicstaticbyte[] fileToByteArray(StringfilePath){
//create sourceFilefile=newFile(filePath);
//select streamInputStreamis=null;
ByteArrayOutputStreamos=null;
try {
//create objectis=newFileInputStream(file);
os=newByteArrayOutputStream();
//create catch placebyte[] flush=newbyte[1024*10];
//do somethingintlen=-1;
while ((len=is.read(flush))!=-1){
Stringstr=newString(flush, 0, len);
os.write(str.getBytes());
                }
os.flush();
returnos.toByteArray();
            } catch (FileNotFoundExceptione) {
e.printStackTrace();
            } catch (IOExceptione) {
e.printStackTrace();
            } finally {
//先开后关try {
if (null!=os){
is.close();
                    }
                } catch (IOExceptione) {
e.printStackTrace();
                }
try {
if (null!=is){
is.close();
                    }
                } catch (IOExceptione) {
e.printStackTrace();
                }
            }
returnnull;
        }
``````java/**字节流转文件*/publicstaticbooleanbyteArrayToFile(byte[] bytesArray, StringfilePath){
//create sourceFilefile=newFile(filePath);
//select streamByteArrayInputStreamis=null;
FileOutputStreamos=null;
try {
//create objectis=newByteArrayInputStream(bytesArray);
os=newFileOutputStream(file);
//create catch placebyte[] flush=newbyte[1024*10];
//do somethingintlen=-1;
while ((len=is.read(flush))!=-1){
os.write(flush, 0, len);
                }
os.flush();
returntrue;
            } catch (FileNotFoundExceptione) {
e.printStackTrace();
            } catch (IOExceptione) {
e.printStackTrace();
            } finally {
//先开后关try {
if (null!=os){
is.close();
                    }
                } catch (IOExceptione) {
e.printStackTrace();
                }
try {
if (null!=is){
is.close();
                    }
                } catch (IOExceptione) {
e.printStackTrace();
                }
            }
returnfalse;
        }
``````javapublicstaticbooleanbyteArrayToFile(byte[] bytesArray, StringfilePath){
//create sourceFilefile=newFile(filePath);
//select stream(高版本JDK，无需close，try会帮你执行close, 操作字节流使用BufferedI/O，大大提高性能)try (ByteArrayInputStreamis=newByteArrayInputStream(bytesArray); OutputStreamos=newBufferedOutputStream(newFileOutputStream(file))){
//create catch placebyte[] flush=newbyte[1024*10];
intlen=-1;
while ((len=is.read(flush))!=-1){
os.write(flush, 0, len);
            }
os.flush();
returntrue;
        } catch (FileNotFoundExceptione) {
e.printStackTrace();
        } catch (IOExceptione) {
e.printStackTrace();
        }
returnfalse;
    }
```-字节流，字符流转换；页面源代码读取```javaimportjava.io.*;
importjava.net.URL;
/*** @author yyds* 字符流转字节流**/publicclassConvertTest {
publicstaticvoidmain(String[] args) {
//操作system,,in和system.outtry (
// InputStreamReader isr = new InputStreamReader(System.in);//OutputStreamWriter osw = new OutputStreamWriter(System.out);BufferedReaderisr=newBufferedReader(newInputStreamReader(System.in));
BufferedWriterosw=newBufferedWriter(newOutputStreamWriter(System.out));
BufferedReaderis=newBufferedReader(newInputStreamReader(newURL("http://www.baidu.com").openStream(), "UTF-8"));
BufferedWriterbw=newBufferedWriter(newOutputStreamWriter(newFileOutputStream("baidu.html"), "UTF-8"));
             ) {
inttemp;
Stringtemp2;
Stringtemp1;
while ((temp=is.read())!=-1){
System.out.print((char) temp);
bw.write(temp);
                }
while ((temp1=is.readLine())!=null){
bw.write(temp1);
bw.newLine();
                }
bw.flush();
while (!"exit".equals(temp2=isr.readLine())){
osw.write(temp2);
osw.newLine();
osw.flush();
            } } catch (IOExceptione) {
System.out.println(e.toString());
        }
    }
}
```