java与c/c++进行socket通信的一些问题(2)

本部分提出另外一种做法, 供参考。


import java.net.*;
import java.io.*;

/**
* 与C语言通信(java做Client，c/c++做Server，传送一个结构)
* @author kingfish
* @version 1.0
*/
public class Employee2 {
private String name;
private int id;
private float salary;

/**
* 将int转为低字节在前，高字节在后的int
*/
private static int toLH(int in) {
int out = 0;
out = (in & 0xff) << 24;
out |= (in & 0xff00) << 8;
out |= (in & 0xff0000) >> 8;
out |= (in & 0xff000000) >> 24;
return out;
}

/**
* 将float转为低字节在前，高字节在后的int
*/
private static int toLH(float f) {
return toLH(Float.floatToRawIntBits(f));
}

/**
* 构造并转换
*/
public Employee2(String name, int id, float salary) {
this.name = name;
this.id = id;
this.salary = salary;
}

/**
* 取得名字，定长byte数组
*/
public byte[] getName() {
byte[] b = new byte[20];
System.arraycopy(name.getBytes(), 0, b, 0, name.getBytes().length);
return b;
}

/**
* 取得编号(低字节在前)
*/
public int getId() {
return toLH(id);
}

/**
* 取得工资(低字节在前)
*/
public int getSalary() {
return toLH(salary);
}

/**
* 发送测试
*/
public static void main(String[] args) {
try {
Employee2 p = new Employee2("kingfish", 123456789, 8888.99f);

Socket sock = new Socket("127.0.0.1", 8888);
DataOutputStream dos = new DataOutputStream(sock.getOutputStream());
dos.write(p.getName());
dos.writeInt(p.getId());
dos.writeInt(p.getSalary());
sock.close();
}
catch (Exception e) {
e.printStackTrace();
}
}
} //end

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如有任何问题，请指正！

kingfish

原文转自：http://www.ltesting.net