自己做网站怎么租服务器,网站备案查询接口,让公司做网站要注意什么,厦门孚珀科技 网站开发再介绍一下其他一些流的使用
数据操作流#xff0c;数据输入流允许应用程序以独立于机器的方式从底层输入流读取原始Java数据类型#xff0c;意思就是平台无关#xff0c;相关的两个类DataInputStream、DataOutputStream#xff0c;使用如下#xff1a;
public class Da…再介绍一下其他一些流的使用
数据操作流数据输入流允许应用程序以独立于机器的方式从底层输入流读取原始Java数据类型意思就是平台无关相关的两个类DataInputStream、DataOutputStream使用如下
public class DataInputStreamTest {public static void main(String[] args) {DataInputStreamTest test new DataInputStreamTest();test.testDataOutputStream();
// test.testDataInputStream();}public void testDataInputStream() {DataInputStream dataInputStream null;try {dataInputStream new DataInputStream(new FileInputStream(E:\\test\\input.doc));byte []b new byte[1024];dataInputStream.read(b);System.out.println(new String(b));} catch (FileNotFoundException e) {e.printStackTrace();} catch (IOException e) {e.printStackTrace();}finally {if (dataInputStream ! null) {try {dataInputStream.close();} catch (IOException e) {e.printStackTrace();}}}}public void testDataOutputStream() {DataOutputStream dataOutputStream null;try {byte []by new byte[2048];ByteArrayOutputStream byteArrayInputStream new ByteArrayOutputStream(2048);dataOutputStream new DataOutputStream(byteArrayInputStream);dataOutputStream.writeInt(5);dataOutputStream.writeChars(hahaha);dataOutputStream.writeInt(6);byte[] bs byteArrayInputStream.toByteArray();for (byte b : bs) {System.out.print (b );}//存入非字符型数据乱码还不知为何//0 0 0 53 0 104 0 97 0 104 0 97 0 104 0 97 0 0 0 6 } catch (Exception e) {}finally {try {if (dataOutputStream ! null) {dataOutputStream.close();}} catch (IOException e) {e.printStackTrace();}}}}
打印流可用于将对象的格式表示打印到文本输出流相关的类PrintWriter使用如下
public void testPrintWriter() {PrintWriter printWriter null;BufferedReader bufferedReader null;try {bufferedReader new BufferedReader(new FileReader(E:\\test\\input.txt));printWriter new PrintWriter(new File(E:\\test\\printwriter.txt));String s null;while((s bufferedReader.readLine()) ! null) {printWriter.write(s);}} catch (Exception e) {}finally {if (printWriter ! null) {printWriter.close();}if (bufferedReader!null) {try {bufferedReader.close();} catch (IOException e) {// TODO Auto-generated catch blocke.printStackTrace();}}}}
标准输入输出流相关操作如下
/*** 标准输入流使用*/private void testStandInputStream() {//标准输入流可用于键盘录入Scanner scanner new Scanner(System.in);System.out.println(课题选择);System.out.println(\t计算机原理001);System.out.println(\t信息系统论002);System.out.println(\t计算机网络003);System.out.println(\t数据库原理004);System.out.println();System.out.println(请输入要选择的课题代号按回车键确定);String nextLine scanner.nextLine();if (001.equals(nextLine)) {System.out.println(选择的课程是计算机原理);}else if (002.equals(nextLine)) {System.out.println(选择的课程是信息系统论);}else if (003.equals(nextLine)) {System.out.println(选择的课程是计算机网络);}else if (004.equals(nextLine)) {System.out.println(选择的课程是数据库原理);}System.out.println(系统关闭!);System.exit(-1);}//标准输出流 private void testStandOutputStream() {PrintStream out System.out;out.println(打印信息到控制台);}
对象输入输出流也叫做序列化流可用于对象的序列化和反序列化就是可以实现将对象写入文本、从文本中读取信息到对象中这里是读取数据到对象常用于网络信息传输和远程方法调用实例如下
/*** 测试对象输入输出流也叫做序列化流* 通过对象输出流可以进行序列化将对象写入到文本通过对象输入流可以实现反序列化从文本中读取对象*/
public class ObjectStreamTest {public static void main(String[] args) {ObjectStreamTest test new ObjectStreamTest();test.testObjectOutputStream();test.testObjectInputStream();}/*** 通过对象输出流可以进行序列化将对象写入到文本*/public void testObjectOutputStream() {ObjectOutputStream objectOutputStream null;try {objectOutputStream new ObjectOutputStream(new FileOutputStream(E:\\test\\user.txt));User user new User(小王, 13);objectOutputStream.writeObject(user);objectOutputStream.flush();objectOutputStream.close();} catch (Exception e) {e.printStackTrace();}}/*** 通过对象输入流可以实现反序列化从文本中读取对象*/public void testObjectInputStream() {ObjectInputStream objectInputStream null;try {objectInputStream new ObjectInputStream(new FileInputStream(E:\\test\\user.txt));Object readObject objectInputStream.readObject();System.out.println(readObject);//User [name小王, age0]objectInputStream.close();} catch (Exception e) {e.printStackTrace();}}}/*** 对象一定要实现序列化接口*/
class User implements Serializable{private static final long serialVersionUID -1796903937206347177L;private String name;private transient int age;//可以防止成员被序列化public User(String name,int age) {this.name name;this.age age;}public String getName() {return name;}public void setName(String name) {this.name name;}public int getAge() {return age;}public void setAge(int age) {this.age age;}Overridepublic String toString() {return User [name name , age age ];}}介绍最后一个合并流可用于将多个输入流中数据合并到一个流中使用如下
public class AddStreamTest {/*** 将两个流中的数据同时写到一个文件中*/public static void main(String[] args) throws IOException {FileOutputStream fileOutputStream new FileOutputStream(E:\\test\\input3.txt);FileInputStream fileInputStream1 new FileInputStream(E:\\test\\input.txt);FileInputStream fileInputStream2 new FileInputStream(E:\\test\\input2.txt);SequenceInputStream sequenceInputStream new SequenceInputStream(fileInputStream1,fileInputStream2);byte []b new byte[1024];int len 0;while((len sequenceInputStream.read(b, 0, b.length)) ! -1) {fileOutputStream.write(b, 0, len);}fileOutputStream.close();sequenceInputStream.close();fileInputStream1.close();fileInputStream2.close();}
}还有一些其他的流在这里就不做介绍了。
