The first grant of the reasons why the project would like to achieve is a need to be able to connect on database early to judge the results online to find a lot of ways basically isReachable are used () judgment, do not know why this method always return False, so only write yourself a a. The following code directly, to a method of first ping IP and port number
public boolean isHostConnection(String ip, int port) {
Socket socket = new Socket();
try {
socket.connect(new InetSocketAddress(ip, port),3000);
} catch (SocketTimeoutException s) {
return false;
} catch (IOException e) {
e.printStackTrace();
return false;
} finally {
try {
socket.close();
} catch (IOException e) {
e.printStackTrace();
}
}
return true;
}
// The following is a return connection state
public List<HashMap<String,Object>> getConnectionState(){
List<HashMap<String,Object>> listMap = new ArrayList<HashMap<String, Object>>();
try {
List<FactoryDataBaseConfig> fdb = factoryDataBaseConfigService.getFactoryState();
List<String> list = new ArrayList<String>();
HashMap<String,Object> map = new HashMap<String,Object>();
for(int i = 0; i < fdb.size(); i++){
boolean result = false;
result = this.isHostConnectable(fdb.get(i).getIpHost(), 1433);
if(result){
int factoryState = factoryDataBaseConfigService.updateStateTrue(fdb.get(i).getOrgfk());
if(factoryState == 1){
map.put("state", true);
}else{
map.put("state", false);
}
}else{
int factoryState = factoryDataBaseConfigService.updateStateFalse(fdb.get(i).getOrgfk());
if(factoryState == 1){
map.put("state", true);
}else{
map.put("state", false);
}
list.add(fdb.get(i).getOrgname());
}
}
map.put("list", list);
listMap.add(map);
} catch (Exception e) {
throw new RuntimeException(e.getMessage());
}
return listMap;
}