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文件同步java源代码 java文件同步系统

200分求JAVA 用socket进行文件的同步

客户端,Client.java:

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public class Client {

public static void main(String[] args) throws IOException {

Socket socket = null;

String host = "127.0.0.1";

socket = new Socket(host, 4444);

File file = new File("M:\\test.xml");

// Get the size of the file

long length = file.length();

byte[] bytes = new byte[16 * 1024];

InputStream in = new FileInputStream(file);

OutputStream out = socket.getOutputStream();

int count;

while ((count = in.read(bytes)) 0) {

out.write(bytes, 0, count);

}

out.close();

in.close();

socket.close();

}

}

服务端,Server.java:

public class Server {

public static void main(String[] args) throws IOException {

ServerSocket serverSocket = null;

try {

serverSocket = new ServerSocket(4444);

} catch (IOException ex) {

System.out.println("Can't setup server on this port number. ");

}

Socket socket = null;

InputStream in = null;

OutputStream out = null;

try {

socket = serverSocket.accept();

} catch (IOException ex) {

System.out.println("Can't accept client connection. ");

}

try {

in = socket.getInputStream();

} catch (IOException ex) {

System.out.println("Can't get socket input stream. ");

}

try {

out = new FileOutputStream("M:\\test2.xml");

} catch (FileNotFoundException ex) {

System.out.println("File not found. ");

}

byte[] bytes = new byte[16*1024];

int count;

while ((count = in.read(bytes)) 0) {

out.write(bytes, 0, count);

}

out.close();

in.close();

socket.close();

serverSocket.close();

}

}

java如何实现两台计算机之间文件夹同步更新

实现两台电脑同步文件夹的方法:

1、在登录完成之后,客户端会自动弹出配置向导。

2、选择目标文件夹之后,客户端会自动在该文件夹下面生成名为“”的同步文件夹。

即可实现成功。

java如何实现服务器之间的文件同步

给大家讲讲我的学习经历吧,开始的两年我学JAVA就是拿书看,练习书上的例子,但是一直没有好的效果。后来因为项目需要开始正式使用JAVA开发,我发现以前练习的东西都忘光了,所以不得不在拿起书看。也就是基本上做了无用功了。现在想来因为大部分是抄来的,不怎么动脑子,所以不清楚为什么要这样。所以我强烈建议你学习的时候给自己设定一个假想的项目目标,做一个东西出来,网页也好,application也好,这样你才会快速地学习。对java有了一定地感觉以后,你在去看他的DOCUMENT,看他的源码,我建议你从低版本的JAVA源码看起,因为他类少,看起来容易懂。然后你就会知道自己以前编码的东西那些是很幼稚的,是可以用一两句就能搞定的。如果你已经稍微有了些感觉,如果觉得合适也可以考虑参加一些培训,毕竟比自学要轻松些,另外还可以学到别人的一些经验,比如:“动力节点”或“王勇Java”一些学员反应不错的,也建议你们多了解一下其它的培训机构。Y.

高分求两个简单的JAVA设计源代码

上面 wuzhikun12同学写的不错,但我想还不能运行,并且还不太完善。我给个能运行的:(注意:文件名为:Test.java)

//要实现对象间的比较,就必须实现Comparable接口,它里面有个compareTo方法

//Comparable最好使用泛型,这样,无论是速度还是代码量都会减少

@SuppressWarnings("unchecked")

class Student implements ComparableStudent{

private String studentNo; //学号

private String studentName; //姓名

private double englishScore; //英语成绩

private double computerScore; //计算机成绩

private double mathScore; //数学成绩

private double totalScore; //总成绩

//空构造函数

public Student() {}

//构造函数

public Student(String studentNo,String studentName,double englishSocre,double computerScore,double mathScore) {

this.studentNo = studentNo;

this.studentName = studentName;

this.englishScore = englishSocre;

this.computerScore = computerScore;

this.mathScore = mathScore;

}

//计算总成绩

public double sum() {

this.totalScore = englishScore+computerScore+mathScore;

return totalScore;

}

//计算评测成绩

public double testScore() {

return sum()/3;

}

//实现compareTO方法

@Override

public int compareTo(Student student) {

double studentTotal = student.getTotalScore();

return totalScore==studentTotal?0:(totalScorestudentTotal?1:-1);

}

//重写toString方法

public String toString(){

return "学号:"+this.getStudentNo()+" 姓名:"+this.getStudentName()+" 英语成绩:"+this.getEnglishScore()+" 数学成绩:"+this.getMathScore()+" 计算机成绩:"+this.getComputerScore()+" 总成绩:"+this.getTotalScore();

}

//重写equals方法

public boolean equals(Object obj) {

if(obj == null){

return false;

}

if(!(obj instanceof Student)){

return false;

}

Student student = (Student)obj;

if(this.studentNo.equals(student.getStudentName())) { //照现实来说,比较是不是同一个学生,应该只是看他的学号是不是相同

return true;

} else {

return false;

}

}

/*以下为get和set方法,我个人认为,totalScore的set的方法没必要要,因为它是由其它成绩计算出来的

在set方法中,没设置一次值,调用一次sum方法,即重新计算总成绩

*/

public String getStudentNo() {

return studentNo;

}

public void setStudentNo(String studentNo) {

this.studentNo = studentNo;

sum();

}

public String getStudentName() {

return studentName;

}

public void setStudentName(String studentName) {

this.studentName = studentName;

sum();

}

public double getEnglishScore() {

return englishScore;

}

public void setEnglishScore(double englishScore) {

this.englishScore = englishScore;

sum();

}

public double getComputerScore() {

return computerScore;

}

public void setComputerScore(double computerScore) {

this.computerScore = computerScore;

sum();

}

public double getMathScore() {

return mathScore;

}

public void setMathScore(double mathScore) {

this.mathScore = mathScore;

sum();

}

public double getTotalScore() {

return totalScore;

}

}

//Student子类学习委员类的实现

class StudentXW extends Student {

//重写父类Student的testScore()方法

@Override

public double testScore() {

return sum()/3+3;

}

public StudentXW() {}

//StudentXW的构造函数

public StudentXW(String studentNo,String studentName,double englishSocre,double computerScore,double mathScore) {

super(studentNo,studentName,englishSocre,computerScore,mathScore);

}

}

//Student子类班长类的实现

class StudentBZ extends Student {

//重写父类Student的testScore()方法

@Override

public double testScore() {

return sum()/3+5;

}

public StudentBZ() {}

//StudentXW的构造函数

public StudentBZ(String studentNo,String studentName,double englishSocre,double computerScore,double mathScore) {

super(studentNo,studentName,englishSocre,computerScore,mathScore);

}

}

//测试类

public class Test {

public static void main(String[] args) {

//生成若干个student类、StudentXW类、StudentBZ类

Student student1 = new Student("s001","张三",70.5,50,88.5);

Student student2 = new Student("s002","李四",88,65,88.5);

Student student3 = new Student("s003","王五",67,77,90);

StudentXW student4 = new StudentXW("s004","李六",99,88,99.5);

StudentBZ student5 = new StudentBZ("s005","朱漆",56,65.6,43.5);

Student[] students = {student1,student2,student3,student4,student5};

for(int i = 0 ; istudents.length; i++){

double avgScore = students[i].testScore();

System.out.println(students[i].getStudentName()+"学生的评测成绩为:"+ avgScore+"分");

}

}

}

运行结果为:

张三学生的评测成绩为:69.66666666666667分

李四学生的评测成绩为:80.5分

王五学生的评测成绩为:78.0分

李六学生的评测成绩为:98.5分

朱漆学生的评测成绩为:60.03333333333333分


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