java与c通过socket通信——传递对象与结构体

import java.net.*; /** * 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 Employee { private byte[] buf = new byte[28]; // 为说明问题，定死大小，事件中可以灵活处理 /** * 将int转为低字节在前，高字节在后的byte数组 */ private static byte[] tolh(int n) { byte[] b = new byte[4]; b[0] = (byte) (n & 0xff); b[1] = (byte) (n >> 8 & 0xff); b[2] = (byte) (n >> 16 & 0xff); b[3] = (byte) (n >> 24 & 0xff); return b; } /** * 将byte数组转化成String */ private static String toStr(byte[] valArr,int maxLen) { int index = 0; while(index < valArr.length && index < maxLen) { if(valArr[index] == 0) { break; } index++; } byte[] temp = new byte[index]; System.arraycopy(valArr, 0, temp, 0, index); return new String(temp); } /** * 将低字节在前转为int，高字节在后的byte数组 */ private static int vtolh(byte[] bArr) { int n = 0; for(int i=0;i<bArr.length&&i<4;i++){ int left = i*8; n+= (bArr[i] << left); } return n; } public String name = ""; public int id = 0; public float salary = 0; /** * 将float转为低字节在前，高字节在后的byte数组 */ private static byte[] tolh(float f) { return tolh(Float.floatToRawIntBits(f)); } private static Employee getEmployee(byte[] bArr) { String name = ""; int id = 0; float salary = 0; byte[] temp = new byte[20]; name = toStr(bArr,20); System.arraycopy(bArr, 20, temp, 0, 4); id = vtolh(temp); return new Employee(name, id, salary); } /** * 构造并转换 */ public Employee(String name, int id, float salary) { this.name = name; this.id = id; this.salary = salary; byte[] temp = name.getBytes(); System.arraycopy(temp, 0, buf, 0, temp.length); temp = tolh(id); System.arraycopy(temp, 0, buf, 20, temp.length); temp = tolh(salary); System.arraycopy(temp, 0, buf, 24, temp.length); } /** * 返回要发送的数组 */ public byte[] getbuf() { return buf; } /** * 发送测试 */ public static void main(String[] args) { try { int index = 0; byte[] receive = new byte[28]; int k=15; while(k>0){ Socket sock = new Socket("127.0.0.1", 5050); System.out.println("send content: name=kingfish "+"value="+(1+index)); sock.getOutputStream().write(new Employee("kingfish"+index, 1+index++, 10.99f + index).getbuf()); sock.getInputStream().read(receive); Employee ee = getEmployee(receive); System.out.println(" response: name="+ee.name+" "+"value="+ee.id); k--; sock.close(); } } catch (Exception e) { e.printStackTrace(); } } } // end