Java 套接字客户端永远阻塞
我正在用Java编写套接字客户端。 在程序中,我想从服务器获取信息。 当服务器接收到“GET_LIGHTS”命令时,它以JSON格式发回数据 但是在我的代码中,Java 套接字客户端永远阻塞,java,sockets,tcp,network-programming,java-io,Java,Sockets,Tcp,Network Programming,Java Io,我正在用Java编写套接字客户端。 在程序中,我想从服务器获取信息。 当服务器接收到“GET_LIGHTS”命令时,它以JSON格式发回数据 但是在我的代码中,bw.write()和bw.flush()在socket.close()之前不起作用。 因此,BufferedReader对象尚未就绪:br.ready()返回false 我的密码有错误吗 客户机代码如下所示 package monitor; import java.io.*; import java.net.InetSocketAdd
bw.write()
和bw.flush()
在socket.close()之前不起作用。
因此,BufferedReader对象尚未就绪:br.ready()
返回false
我的密码有错误吗
客户机代码如下所示
package monitor;
import java.io.*;
import java.net.InetSocketAddress;
import java.net.Socket;
import java.util.ArrayList;
public class SocketClient {
static private int port;
static private String hostName;
private Socket socket;
public SocketClient(String host, int port) {
this.hostName = host;
this.port = port;
}
// get lights by JSON
public void getLights() {
try {
// generate socket
InetSocketAddress endpoint = new InetSocketAddress(hostName, port);
socket = new Socket();
socket.connect(endpoint);
// setting
OutputStreamWriter out = new OutputStreamWriter(socket.getOutputStream());
BufferedWriter bw = new BufferedWriter(out);
InputStreamReader in = new InputStreamReader(socket.getInputStream());
BufferedReader br = new BufferedReader(in);
// send command
bw.write("GET_LIGHTS");
bw.flush();
// receive message from server
System.out.println(br.readLine());
socket.close();
} catch (IOException e) {
e.printStackTrace();
}
}
public void initLights(ArrayList<Light> lights) {
getLights();
}
}
包装监视器;
导入java.io.*;
导入java.net.InetSocketAddress;
导入java.net.Socket;
导入java.util.ArrayList;
公共类SocketClient{
静态专用int端口;
静态私有字符串主机名;
专用插座;
公共SocketClient(字符串主机,int端口){
this.hostName=host;
this.port=端口;
}
//通过JSON获取灯光
公共照明{
试一试{
//生成套接字
InetSocketAddress端点=新的InetSocketAddress(主机名、端口);
套接字=新套接字();
socket.connect(端点);
//背景
OutputStreamWriter out=新的OutputStreamWriter(socket.getOutputStream());
BufferedWriter bw=新的BufferedWriter(输出);
InputStreamReader in=新的InputStreamReader(socket.getInputStream());
BufferedReader br=新的BufferedReader(in);
//发送命令
写下(“获取灯光”);
bw.flush();
//从服务器接收消息
System.out.println(br.readLine());
socket.close();
}捕获(IOE异常){
e、 printStackTrace();
}
}
公共灯光(阵列列表灯光){
getLights();
}
}
编辑:
import com.fasterxml.jackson.core.JsonProcessingException;
import com.fasterxml.jackson.databind.ObjectMapper;
import java.io.*;
import java.net.ServerSocket;
import java.net.Socket;
import java.util.ArrayList;
public class SocketServer extends Thread{
static final int PORT = 44344;
static private ILS ils;
private ServerSocket serverSocket;
private Socket socket;
public SocketServer(ILS ils) {
this.ils = ils;
}
@Override
public void run() {
serverSocket = null;
System.out.println("Server: listening");
try {
serverSocket = new ServerSocket(PORT);
while(true){
socket = serverSocket.accept();
BufferedReader br = new BufferedReader(
new InputStreamReader(socket.getInputStream()));
ArrayList<String> cmd = new ArrayList<>();
String in;
while( (in = br.readLine()) != null ){
cmd.add(in);
}
command(cmd);
if( socket != null){
socket.close();
}
}
} catch (IOException e) {
e.printStackTrace();
}
if( serverSocket != null){
try {
serverSocket.close();
serverSocket = null;
} catch (IOException e) {
e.printStackTrace();
}
}
}
// send message to client
private void sendMessage(String str) {
System.out.println(str);
try {
OutputStream output = socket.getOutputStream();
BufferedWriter bw = new BufferedWriter(new OutputStreamWriter(output));
bw.write(str + "¥n");
bw.flush();
bw.close();
} catch (IOException e) {
e.printStackTrace();
}
}
// error
private void printError(String err) {
String str = "ERROR; ";
str += err;
sendMessage(str);
}
public void command(ArrayList<String> cmd) {
String mode = cmd.get(0);
if(mode == null){
}else switch(mode){
case "MANUAL_SIG-ALL":
System.out.println("全照明一括 信号値指定調光");
manualSigAll(cmd.get(1));
break;
case "MANUAL_SIG-INDIVIDUAL":
System.out.println("全照明独立 信号値指定調光");
manualSigIndividual(cmd.get(1));
break;
case "MANUAL_ID-SIG":
System.out.println("照明ID・信号値指定調光");
manualIDSig(cmd.get(1));
break;
case "MANUAL_ID-RELATIVE":
System.out.println("照明ID・相対信号値指定調光");
break;
case "DOWNLIGHT_ALL":
System.out.println("Downlight: All Control");
downlightAll(cmd.get(1));
break;
case "DOWNLIGHT_INDIVIDUAL":
System.out.println("Downlight: Individual control");
downlightIndividual(cmd.get(1));
break;
case "GET_LIGHTS":
System.out.println("Sending lights via JSON");
sendLights();
break;
default:
System.out.println("Error: 不明なmode command");
}
}
// 全照明一括 信号値指定調光
private void manualSigAll(String sigs) {
if(sigs == null) {
System.out.println("信号値のフォーマットを確認してください");
} else {
ArrayList<Integer> s = new ArrayList<>();
String[] buf = sigs.split(",");
for(String i:buf) s.add(Integer.parseInt(i));
for(Light l: ils.getLights()) {
l.setLumPct((double)s.get(0)/255.0*100.0);
l.setSignal(s.get(0), s.get(1));
}
}
// 調光
ils.downlightDimmer.send();
}
// 全照明独立 信号値指定調光
private void manualSigIndividual(String sigs) {
if(sigs == null) {
System.out.println("信号値のフォーマットを確認してください");
} else {
ArrayList<Integer> s = new ArrayList<>();
String[] buf = sigs.split(",");
for(String i:buf) s.add(Integer.parseInt(i));
for(int i=0; i<ils.getLights().size(); i++) {
ils.getLights().get(i).setSignal(s.get(0), s.get(1));
s.remove(0);
s.remove(0);
}
}
ils.downlightDimmer.send();
}
// 照明ID・信号値指定調光
private void manualIDSig(String sigs) {
if(sigs == null) {
System.out.println("信号値のフォーマットを確認してください");
} else {
ArrayList<Integer> s = new ArrayList<>();
String[] buf = sigs.split(",");
for(String i:buf) s.add(Integer.parseInt(i));
System.out.println(s.get(0));
ils.getLight(s.get(0)).setSignal(s.get(1), s.get(2));
}
ils.downlightDimmer.send();
}
private void downlightAll(String cmd) {
if(cmd == null) {
printError("Check for data command.");
} else {
ArrayList<Double> data = new ArrayList<>();
String[] buf = cmd.split(",");
for(String i:buf) data.add(Double.parseDouble(i));
for(Light l: ils.getLights()) {
l.setLumPct(data.get(0));
l.setTemperature(data.get(1));
}
}
// dimming
ils.downlightDimmer.send();
}
private void downlightIndividual(String cmd) {
if(cmd == null) {
printError("Check for data command.");
} else {
ArrayList<Integer> id = new ArrayList<>();
ArrayList<Double> lumPct = new ArrayList<>();
ArrayList<Integer> temp = new ArrayList<>();
String[] buf = cmd.split(",");
if(buf.length % 3 != 0) {printError("invalid number of data.");}
for(int i=0; i<buf.length/3; i++) {
int n = i*3;
try {
id.add(Integer.parseInt(buf[n]));
lumPct.add(Double.parseDouble(buf[n + 1]));
temp.add(Integer.parseInt(buf[n + 2]));
} catch (Exception e) {
printError(e.getMessage());
return;
}
}
while (id.size() > 0) {
// update light object
Light light = ils.getLight(id.get(0));
light.setLumPct(lumPct.get(0));
light.setTemperature(temp.get(0));
// remove data from array list
id.remove(0);
lumPct.remove(0);
temp.remove(0);
}
// dimming
ils.downlightDimmer.send();
}
}
private void sendLights() {
ObjectMapper mapper = new ObjectMapper();
String json = "";
try {
json = mapper.writeValueAsString(ils.getLights());
} catch (JsonProcessingException e) {
e.printStackTrace();
}
// output
sendMessage(json);
}
}
import com.fasterxml.jackson.core.JsonProcessingException;
导入com.fasterxml.jackson.databind.ObjectMapper;
导入java.io.*;
导入java.net.ServerSocket;
导入java.net.Socket;
导入java.util.ArrayList;
公共类SocketServer扩展线程{
静态最终int端口=44344;
静态专用ILS;
私有服务器套接字服务器套接字;
专用插座;
公共SocketServer(ILS){
this.ils=ils;
}
@凌驾
公开募捐{
serverSocket=null;
System.out.println(“服务器:侦听”);
试一试{
serverSocket=新的serverSocket(端口);
while(true){
socket=serverSocket.accept();
BufferedReader br=新的BufferedReader(
新的InputStreamReader(socket.getInputStream());
ArrayList cmd=新的ArrayList();
串入;
而((in=br.readLine())!=null){
cmd.add(in);
}
指挥部(cmd);
if(套接字!=null){
socket.close();
}
}
}捕获(IOE异常){
e、 printStackTrace();
}
if(serverSocket!=null){
试一试{
serverSocket.close();
serverSocket=null;
}捕获(IOE异常){
e、 printStackTrace();
}
}
}
//向客户端发送消息
私有void发送消息(字符串str){
系统输出打印项次(str);
试一试{
OutputStream输出=socket.getOutputStream();
BufferedWriter bw=新的BufferedWriter(新的OutputStreamWriter(输出));
bw.写入(str+“¥n”);
bw.flush();
bw.close();
}捕获(IOE异常){
e、 printStackTrace();
}
}
//错误
私有void打印错误(字符串错误){
String str=“ERROR;”;
str+=err;
发送消息(str);
}
public void命令(ArrayList cmd){
字符串模式=cmd.get(0);
如果(模式==null){
}else开关(模式){
案例“手动_SIG-ALL”:
System.out.println(“全照明一括 信号値指定調光");
手动信号发生器(指令get(1));
打破
案例“手动信号个人”:
System.out.println(“全照明独立 信号値指定調光");
手动信号发生器(指令get(1));
打破
案例“手动识别信号”:
System.out.println(“照明身份证件・信号値指定調光");
手动IDSIG(命令get(1));
打破
案例“手动识别-相关”:
System.out.println(“照明身份证件・相対信号値指定調光");
打破
案例“筒灯所有”:
System.out.println(“筒灯:所有控制”);
downlightAll(命令获取(1));
打破
案例“筒灯\个人”:
System.out.println(“筒灯:单独控制”);
筒灯个人(命令获取(1));
打破
案例“获取灯光”:
System.out.println(“通过JSON发送灯光”);
sendLights();
打破
违约:
System.out.println(“错误:不明な模式命令);
}
}
// 全照明一括 信号値指定調光
专用无效手动SIGALL(字符串sigs){
如果(sigs==null){
System.out.println(“信号値のフォーマットを確認してください");
}否则{
ArrayList s=新的ArrayList();
字符串[]buf=sigs.split(“,”);
对于(stringi:buf)s.add(Integer.parseInt(i));
对于(灯光l:ils.getLights()){
l、 setLumPct((双)s.get(0)/255.0*100.0);
l、 设置信号(s.get(0),s.get(1));
}
}
// 調光
ils.downlightDimmer.send();
}
// 全照明独立 信号値指定調光
私有无效手动sigs个人(字符串sigs){
如果(sigs==null){
System.out.println(“?
while( (in = br.readLine()) != null ){
cmd.add(in);
}