我正在尝试为Android收集坐标的应用程序（客户端），它计算用户移动的速度，然后将它们发送到另一个Android应用程序（服务器）。在服务器上我检查用户是否运行得太快并且我发送消息（从服务器到客户端）以减慢速度，我还检查两个用户是否可能崩溃并且我发送了相应的消息。
我的问题是，当两个应用程序似乎工作正常（客户端正在运行并显示速度，服务器正在运行并显示正在侦听的端口及其IP）时，服务器不会收到我从客户端发送的数据。我无法理解有什么不对。我不确定服务器是否没有接收或客户端没有发送。
我的服务器代码是：
private static Socket socket;
TextView msg;
private ArrayList<String[]> client = new ArrayList<String[]>();
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
msg=(TextView)findViewById(R.id.msg);
try
{
int port = 8080;
ServerSocket serverSocket = new ServerSocket(port);
msg.setText("Server Started and listening to the port 8080"+" "+getIpAddress());
//Server is running always. This is done using this while(true) loop
while(true)
{
//Reading the message from the client
socket = serverSocket.accept();
InputStream is = socket.getInputStream();
InputStreamReader isr = new InputStreamReader(is);
BufferedReader br = new BufferedReader(isr);
String elements = br.readLine();
String[] parts = elements.split("_");
String part1 = parts[0]; // x1
String part2 = parts[1]; // y1
String part3 = parts[2]; // speed
String part4 = parts[3]; // direction 1
String part5 = parts[4]; // direction 2
String part6 = parts[5]; // x2
String part7 = parts[6]; // y2
parts[7] = Integer.toString(socket.getPort()); // client's port
msg.setText("Message received from client is "+elements);
if(client.contains(parts[7])) {
client.remove(client.indexOf(parts[7]));
client.add(parts);
}
else {
client.add(parts);
}
String returnMessage;
if (Integer.parseInt(parts[2])>130) {
try {
returnMessage = "Slow down, you are not the Flash!";
} catch (NumberFormatException e) {
returnMessage = e.toString();
}
//Sending the response back to the client.
OutputStream os = socket.getOutputStream();
OutputStreamWriter osw = new OutputStreamWriter(os);
BufferedWriter bw = new BufferedWriter(osw);
bw.write(returnMessage);
msg.setText("Message sent to the client is " + returnMessage);
bw.flush();
}
double x,y;
int distance;
if (Integer.parseInt(parts[2])>50){
for (int i=0; i<client.size(); i++){
String[] temp= new String[6];
temp=client.get(i);
distance= findDistance(Double.parseDouble(parts[0]), Double.parseDouble(parts[1]),Double.parseDouble(temp[0]), Double.parseDouble(temp[1]));
if (distance<500 && distance!=0){
if (Integer.parseInt(temp[2])>50){
//Βρίσκουμε τις συντεταγμένες του θεωρητικού σημείου πρόσκρουσης
x=findXIntersectionPoint(Double.parseDouble(parts[0]), Double.parseDouble(parts[1]),Double.parseDouble(temp[0]), Double.parseDouble(temp[1]),Double.parseDouble(parts[5]), Double.parseDouble(parts[6]),Double.parseDouble(temp[5]), Double.parseDouble(temp[6]));
y=findYIntersectionPoint(Double.parseDouble(parts[0]), Double.parseDouble(parts[1]), Double.parseDouble(parts[5]), Double.parseDouble(parts[6]),x);
//Βρίσκουμε αν η κατεύθυνση του κάθε οχήματος είναι προς το σημείο πρόσκρουσης
if ((findLongitude(Double.parseDouble(parts[0]),Double.parseDouble(parts[5])).equals(parts[3])) && (findLatitude(Double.parseDouble(parts[1]), Double.parseDouble(parts[6])).equals(parts[4])) && (findLongitude(Double.parseDouble(temp[0]),Double.parseDouble(temp[5])).equals(temp[3])) && (findLatitude(Double.parseDouble(temp[1]), Double.parseDouble(temp[6])).equals(temp[4]))){
int dist1, dist2;
float t1,t2;
dist1= findDistance(Double.parseDouble(parts[0]), Double.parseDouble(parts[1]), x,y);
dist2= findDistance(Double.parseDouble(temp[0]), Double.parseDouble(temp[1]), x,y);
t1= dist1/Float.parseFloat(parts[2]);
t2= dist2/Float.parseFloat(temp[2]);
if (t1-t2>-2 && t1-t2<2){
try {
returnMessage = "Possible Collision Slow Down!";
} catch (NumberFormatException e) {
returnMessage = e.toString();
}
OutputStream os = socket.getOutputStream();
OutputStreamWriter osw = new OutputStreamWriter(os);
BufferedWriter bw = new BufferedWriter(osw);
bw.write(returnMessage);
msg.setText("Message sent to the client is " + returnMessage);
bw.flush();
}
}
}
}
}
}
}
}
catch (Exception e)
{
e.printStackTrace();
}
finally
{
try
{
socket.close();
}
catch(Exception e){}
}
}
private int findDistance(final double a1, final double b1, final double a2, final double b2) {
double x1=a1;
double y1=b1;
double x2=a2;
double y2=b2;
int distance;
// Convert degrees to radians
x1=x1*Math.PI/180.0;
y1=y1*Math.PI/180.0;
x2=x2*Math.PI/180.0;
y2=y2*Math.PI/180.0;
// radius of earth in metres
double r = 6378100;
// P
double rho1 = r * Math.cos(y1);
double z1 = r * Math.sin(y1);
double k1 = rho1 * Math.cos(x1);
double l1 = rho1 * Math.sin(x1);
// Q
double rho2 = r * Math.cos(y2);
double z2 = r * Math.sin(y2);
double k2 = rho2 * Math.cos(x2);
double l2 = rho2 * Math.sin(x2);
// Dot product
double dot = (k1 * k2 + l1 * l2 + z1 * z2);
double cos_theta = dot / (r * r);
double theta = Math.acos(cos_theta);
// Distance in Metres
theta = (r*theta);
distance = (int)theta;
return distance;
}
public double findXIntersectionPoint(double x1, double y1, double x3, double y3, double x2, double y2, double x4, double y4)
{
double z1=x1, z2=x2, z3=x3, z4=x4;
double w1=y1, w2=y2, w3=y3, w4=y4;
double x, ya, yb, lamda1, lamda2;
lamda1=(w2-w1)/(z2-z1);
lamda2=(w4-w3)/(z4-z3);
x=(lamda1*z1-lamda2*z3-w1+w3)/(lamda1-lamda2); //Λύση του συστήματος των 2 ευθειών ως προς x
return x;
}
public double findYIntersectionPoint (double x1, double y1,double x2, double y2, double x)
{
double y, lamda;
double z=x, z1=x1, z2=x2;
double w1=y1, w2=y2;
lamda= (w2-w1)/(z2-z1);
y= lamda*(z-z1)+w1;
return y;
}
private String findLongitude(double x1, double x2) {
double z1=x1, z2=x2;
String dir1;
// Using the longitudes
if(z2>z1)
{
dir1="EAST";
}
else {
dir1="WEST";
}
return dir1;
}
private String findLatitude(double y1, double y2) {
double w1=y1, w2=y2;
String dir2;
//using the latitudes
if(w2>w1)
{
dir2="NORTH";
}
else
{
dir2="SOUTH";
}
return dir2;
}
public String getIpAddress() {
String ip = "";
try {
Enumeration<NetworkInterface> enumNetworkInterfaces = NetworkInterface
.getNetworkInterfaces();
while (enumNetworkInterfaces.hasMoreElements()) {
NetworkInterface networkInterface = enumNetworkInterfaces
.nextElement();
Enumeration<InetAddress> enumInetAddress = networkInterface
.getInetAddresses();
while (enumInetAddress.hasMoreElements()) {
InetAddress inetAddress = enumInetAddress
.nextElement();
if (inetAddress.isSiteLocalAddress()) {
ip += "Server running at : "
+ inetAddress.getHostAddress();
}
}
}
} catch (SocketException e) {
// TODO Auto-generated catch block
e.printStackTrace();
ip += "Something Wrong! " + e.toString() + "\n";
}
return ip;
}
我的客户端代码是：
private static Socket socket;
double x1,y1,x2,y2;
int sp;
String dir1, dir2;
String message;
Client(){}
public void run()
{
try
{
int port = 8080;
String address="192.168.1.65";
socket = new Socket(address, port);
//Send the message to the server
OutputStream os = socket.getOutputStream();
OutputStreamWriter osw = new OutputStreamWriter(os);
BufferedWriter bw = new BufferedWriter(osw);
String sendMessage;
sendMessage= Double.toString(x1)+"_"+Double.toString(y1)+"_"+Integer.toString(sp)+"_"+dir1+"_"+dir2+"_"+Double.toString(x2)+"_"+Double.toString(y2);
bw.write(sendMessage);
bw.flush();
//Get the return message from the server
InputStream is = socket.getInputStream();
InputStreamReader isr = new InputStreamReader(is);
BufferedReader br = new BufferedReader(isr);
message = br.readLine();
}
catch (Exception exception)
{
exception.printStackTrace();
}
finally
{
//Closing the socket
try
{
socket.close();
}
catch(Exception e)
{
e.printStackTrace();
}
}
}
public void setElements(double z1, double w1, double z2, double w2, int speed, String direction1, String direction2){
x1=z1;
y1=w1;
x2=z2;
y2=w2;
sp=speed;
dir1=direction1;
dir2=direction2;
}
public String getMessage(){
return message;
}
我将不胜感激，谢谢你们！
答案 0 :(得分：0)
使用netcat进行诊断。几乎每个操作系统都有一个netcat可执行文件（或二进制文件）。它也适用于所有主要的包装经理和＃34; apt-get＆＃34;，＆＃34; yum＆＃34;，macports等。终端命令为nc。
倾听：
nc -l <port>
要求：
nc localhost 8080