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JAVA网络代码,JAVA 网络
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Java的网络连接代码如何测试？
如果是在局域网中测试，本地的话就是127.0.0.1或localhost,或改为局域网中的其它IP地址，如果是广域网的话，那就得搭建服务器，就是不搭建也得有一个固定的外网IP才行。
相关问答
Q1: 关于java网络编程的基础问题，已经附带源代码
你需要用一个list 管理 所有的客户端socket 。
Socket socket = ss.accept();
socketList.add(socket )
然后 再依次向么个socket 输出
for (Iterator iterator = socketList.iterator(); iterator.hasNext();) {
Socket object = (Socket) iterator.next();
OutputStream os = socket.getOutputStream();
DataOutputStream dis = new DataOutputStream(os);
dis.writeUTF( “message”);
}
Q2: java代码TCP/IP网络通信服务器客户端，实现双方信息交互。
package com.weixin.test;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.InetAddress;
import java.net.ServerSocket;
import java.net.Socket;
import org.junit.Test;
public class ScoketTest {
@Test
public void client() throws Exception{
InetAddress i=InetAddress.getByName("127.0.0.1");
Socket s=new Socket(i, 9000);
OutputStream outputStream = s.getOutputStream();
outputStream.write("服务端你好,我是客户端哦!".getBytes());
s.shutdownOutput();
InputStream inputStream=s.getInputStream();
int length=0;
byte[] bytes=new byte[1024];
while ((length=inputStream.read(bytes))!=-1) {
System.err.println(new String(bytes,0,length));
}
inputStream.close();
outputStream.close();
s.close();
}
@Test
public void server() throws Exception{
ServerSocket serverSocket=new ServerSocket(9000);
Socket socket = serverSocket.accept();
InputStream inputStream = socket.getInputStream();
OutputStream outputStream = socket.getOutputStream();
int length=0;
byte[] bytes=new byte[1024];
while ((length=inputStream.read(bytes))!=-1) {
System.err.println(new String(bytes, 0,length));
}
outputStream.write("客户端你好，本王已收到!".getBytes());
outputStream.close();
inputStream.close();
socket.close();
serverSocket.close();
}
}
Q3: 如何用70行Java代码实现深度神经网络算法
import java.util.Random;
public class BpDeep{
public double[][] layer;//神经网络各层节点
public double[][] layerErr;//神经网络各节点误差
public double[][][] layer_weight;//各层节点权重
public double[][][] layer_weight_delta;//各层节点权重动量
public double mobp;//动量系数
public double rate;//学习系数
public BpDeep(int[] layernum, double rate, double mobp){
this.mobp = mobp;
this.rate = rate;
layer = new double[layernum.length][];
layerErr = new double[layernum.length][];
layer_weight = new double[layernum.length][][];
layer_weight_delta = new double[layernum.length][][];
Random random = new Random();
for(int l=0;llayernum.length;l++){
layer[l]=new double[layernum[l]];
layerErr[l]=new double[layernum[l]];
if(l+1layernum.length){
layer_weight[l]=new double[layernum[l]+1][layernum[l+1]];
layer_weight_delta[l]=new double[layernum[l]+1][layernum[l+1]];
for(int j=0;jlayernum[l]+1;j++)
for(int i=0;ilayernum[l+1];i++)
layer_weight[l][j][i]=random.nextDouble();//随机初始化权重
}
}
}
//逐层向前计算输出
public double[] computeOut(double[] in){
for(int l=1;llayer.length;l++){
for(int j=0;jlayer[l].length;j++){
double z=layer_weight[l-1][layer[l-1].length][j];
for(int i=0;ilayer[l-1].length;i++){
layer[l-1][i]=l==1?in[i]:layer[l-1][i];
z+=layer_weight[l-1][i][j]*layer[l-1][i];
}
layer[l][j]=1/(1+Math.exp(-z));
}
}
return layer[layer.length-1];
}
//逐层反向计算误差并修改权重
public void updateWeight(double[] tar){
int l=layer.length-1;
for(int j=0;jlayerErr[l].length;j++)
layerErr[l][j]=layer[l][j]*(1-layer[l][j])*(tar[j]-layer[l][j]);
while(l--0){
for(int j=0;jlayerErr[l].length;j++){
double z = 0.0;
for(int i=0;ilayerErr[l+1].length;i++){
z=z+l0?layerErr[l+1][i]*layer_weight[l][j][i]:0;
layer_weight_delta[l][j][i]= mobp*layer_weight_delta[l][j][i]+rate*layerErr[l+1][i]*layer[l][j];//隐含层动量调整
layer_weight[l][j][i]+=layer_weight_delta[l][j][i];//隐含层权重调整
if(j==layerErr[l].length-1){
layer_weight_delta[l][j+1][i]= mobp*layer_weight_delta[l][j+1][i]+rate*layerErr[l+1][i];//截距动量调整
layer_weight[l][j+1][i]+=layer_weight_delta[l][j+1][i];//截距权重调整
}
}
layerErr[l][j]=z*layer[l][j]*(1-layer[l][j]);//记录误差
}
}
}
public void train(double[] in, double[] tar){
double[] out = computeOut(in);
updateWeight(tar);
}
}
参考资料
Q4: 求java网络聊天室（B/S模式)程序代码
共四个java文件，源代码如下：
import java.awt.*;
import java.net.*;
import java.awt.event.*;
import java.io.*;
import java.util.Hashtable;
public class ChatArea extends Panel implements ActionListener,Runnable
{
Socket socket=null;
DataInputStream in=null;
DataOutputStream out=null;
Thread threadMessage=null;
TextArea 谈话显示区,私聊显示区=null;
TextField 送出信息=null;
Button 确定,刷新谈话区,刷新私聊区;
Label 提示条=null;
String name=null;
Hashtable listTable;
List listComponent=null;
Choice privateChatList;
int width,height;
public ChatArea(String name,Hashtable listTable,int width,int height)
{
setLayout(null);
setBackground(Color.orange);
this.width=width;
this.height=height;
setSize(width,height);
this.listTable=listTable;
this.name=name;
threadMessage=new Thread(this);
谈话显示区=new TextArea(10,10);
私聊显示区=new TextArea(10,10);
确定=new Button("送出信息到:");
刷新谈话区=new Button("刷新谈话区");
刷新私聊区=new Button("刷新私聊区");
提示条=new Label("双击聊天者可私聊",Label.CENTER);
送出信息=new TextField(28);
确定.addActionListener(this);
送出信息.addActionListener(this);
刷新谈话区.addActionListener(this);
刷新私聊区.addActionListener(this);
listComponent=new List();
listComponent.addActionListener(this);
privateChatList=new Choice();
privateChatList.add("大家(*)");
privateChatList.select(0);
add(谈话显示区);
谈话显示区.setBounds(10,10,(width-120)/2,(height-120));
add(私聊显示区);
私聊显示区.setBounds(10+(width-120)/2,10,(width-120)/2,(height-120));
add(listComponent);
listComponent.setBounds(10+(width-120),10,100,(height-160));
add(提示条);
提示条.setBounds(10+(width-120),10+(height-160),110,40);
Panel pSouth=new Panel();
pSouth.add(送出信息);
pSouth.add(确定);
pSouth.add(privateChatList);
pSouth.add(刷新谈话区);
pSouth.add(刷新私聊区);
add(pSouth);
pSouth.setBounds(10,20+(height-120),width-20,60);
}
public void setName(String s)
{
name=s;
}
public void setSocketConnection(Socket socket,DataInputStream in,DataOutputStream out)
{
this.socket=socket;
this.in=in;
this.out=out;
try
{
threadMessage.start();
}
catch(Exception e)
{
}
}
public void actionPerformed(ActionEvent e)
{
if(e.getSource()==确定||e.getSource()==送出信息)
{
String message="";
String people=privateChatList.getSelectedItem();
people=people.substring(0,people.indexOf("("));
message=送出信息.getText();
if(message.length()0)
{
try {
if(people.equals("大家"))
{
out.writeUTF("公共聊天内容:"+name+"说:"+message);
}
else
{
out.writeUTF("私人聊天内容:"+name+"悄悄地说:"+message+"#"+people);
}
}
catch(IOException event)
{
}
}
}
else if(e.getSource()==listComponent)
{
privateChatList.insert(listComponent.getSelectedItem(),0);
privateChatList.repaint();
}
else if(e.getSource()==刷新谈话区)
{
谈话显示区.setText(null);
}
else if(e.getSource()==刷新私聊区)
{
私聊显示区.setText(null);
}
}
public void run()
{
while(true)
{
String s=null;
try
{
s=in.readUTF();
if(s.startsWith("聊天内容:"))
{
String content=s.substring(s.indexOf(":")+1);
谈话显示区.append("\n"+content);
}
if(s.startsWith("私人聊天内容:"))
{
String content=s.substring(s.indexOf(":")+1);
私聊显示区.append("\n"+content);
}
else if(s.startsWith("聊天者:"))
{
String people=s.substring(s.indexOf(":")+1,s.indexOf("性别"));
String sex=s.substring(s.indexOf("性别")+2);
listTable.put(people,people+"("+sex+")");
listComponent.add((String)listTable.get(people));
listComponent.repaint();
}
else if(s.startsWith("用户离线:"))
{
String awayPeopleName=s.substring(s.indexOf(":")+1);
listComponent.remove((String)listTable.get(awayPeopleName));
listComponent.repaint();
谈话显示区.append("\n"+(String)listTable.get(awayPeopleName)+"离线");
listTable.remove(awayPeopleName);
}
Thread.sleep(5);
}
catch(IOException e)
{
listComponent.removeAll();
listComponent.repaint();
listTable.clear();
谈话显示区.setText("和服务器的连接已中断\n必须刷新浏览器才能再次聊天");
break;
}
catch(InterruptedException e)
{
}
}
}
}
ChatServer.java
import java.io.*;
import java.net.*;
import java.util.*;
public class ChatServer
{
public static void main(String args[])
{
ServerSocket server=null;
Socket you=null;
Hashtable peopleList;
peopleList=new Hashtable();
while(true)
{
try
{
server=new ServerSocket(6666);
}
catch(IOException e1)
{
System.out.println("正在监听");
}
try {
you=server.accept();
InetAddress address=you.getInetAddress();
System.out.println("用户的IP:"+address);
}
catch (IOException e)
{
}
if(you!=null)
{
Server_thread peopleThread=new Server_thread(you,peopleList);
peopleThread.start();
}
else {
continue;
}
}
}
}
class Server_thread extends Thread
{
String name=null,sex=null;
Socket socket=null;
File file=null;
DataOutputStream out=null;
DataInputStream in=null;
Hashtable peopleList=null;
Server_thread(Socket t,Hashtable list)
{
peopleList=list;
socket=t;
try {
in=new DataInputStream(socket.getInputStream());
out=new DataOutputStream(socket.getOutputStream());
}
catch (IOException e)
{
}
}
public void run()
{
while(true)
{ String s=null;
try
{
s=in.readUTF();
if(s.startsWith("姓名:"))
{
name=s.substring(s.indexOf(":")+1,s.indexOf("性别"));
sex=s.substring(s.lastIndexOf(":")+1);
boolean boo=peopleList.containsKey(name);
if(boo==false)
{
peopleList.put(name,this);
out.writeUTF("可以聊天:");
Enumeration enum=peopleList.elements();
while(enum.hasMoreElements())
{
Server_thread th=(Server_thread)enum.nextElement();
th.out.writeUTF("聊天者:"+name+"性别"+sex);
if(th!=this)
{
out.writeUTF("聊天者:"+th.name+"性别"+th.sex);
}
}
}
else
{
out.writeUTF("不可以聊天:");
}
}
else if(s.startsWith("公共聊天内容:"))
{
String message=s.substring(s.indexOf(":")+1);
Enumeration enum=peopleList.elements();
while(enum.hasMoreElements())
{
((Server_thread)enum.nextElement()).out.writeUTF("聊天内容:"+message);
}
}
else if(s.startsWith("用户离开:"))
{
Enumeration enum=peopleList.elements();
while(enum.hasMoreElements())
{ try
{
Server_thread th=(Server_thread)enum.nextElement();
if(th!=thisth.isAlive())
{
th.out.writeUTF("用户离线:"+name);
}
}
catch(IOException eee)
{
}
}
peopleList.remove(name);
socket.close();
System.out.println(name+"用户离开了");
break;
}
else if(s.startsWith("私人聊天内容:"))
{
String 悄悄话=s.substring(s.indexOf(":")+1,s.indexOf("#"));
String toPeople=s.substring(s.indexOf("#")+1);
Server_thread toThread=(Server_thread)peopleList.get(toPeople);
if(toThread!=null)
{
toThread.out.writeUTF("私人聊天内容:"+悄悄话);
}
else
{
out.writeUTF("私人聊天内容:"+toPeople+"已经离线");
}
}
}
catch(IOException ee)
{
Enumeration enum=peopleList.elements();
while(enum.hasMoreElements())
{ try
{
Server_thread th=(Server_thread)enum.nextElement();
if(th!=thisth.isAlive())
{
th.out.writeUTF("用户离线:"+name);
}
}
catch(IOException eee)
{
}
}
peopleList.remove(name);
try
{
socket.close();
}
catch(IOException eee)
{
}
System.out.println(name+"用户离开了");
break;
}
}
}
}
import java.awt.*;
import java.io.*;
import java.net.*;
import java.applet.*;
import java.util.Hashtable;
ClientChat.java
public class ClientChat extends Applet implements Runnable
{
Socket socket=null;
DataInputStream in=null;
DataOutputStream out=null;
InputNameTextField 用户提交昵称界面=null;
ChatArea 用户聊天界面=null;
Hashtable listTable;
Label 提示条;
Panel north, center;
Thread thread;
public void init()
{
int width=getSize().width;
int height=getSize().height;
listTable=new Hashtable();
setLayout(new BorderLayout());
用户提交昵称界面=new InputNameTextField(listTable);
int h=用户提交昵称界面.getSize().height;
用户聊天界面=new ChatArea("",listTable,width,height-(h+5));
用户聊天界面.setVisible(false);
提示条=new Label("正在连接到服务器,请稍等...",Label.CENTER);
提示条.setForeground(Color.red);
north=new Panel(new FlowLayout(FlowLayout.LEFT));
center=new Panel();
north.add(用户提交昵称界面);
north.add(提示条);
center.add(用户聊天界面);
add(north,BorderLayout.NORTH);
add(center,BorderLayout.CENTER);
validate();
}
public void start()
{
if(socket!=nullin!=nullout!=null)
{ try
{
socket.close();
in.close();
out.close();
用户聊天界面.setVisible(false);
}
catch(Exception ee)
{
}
}
try
{
socket = new Socket(this.getCodeBase().getHost(), 6666);
in=new DataInputStream(socket.getInputStream());
out=new DataOutputStream(socket.getOutputStream());
}
catch (IOException ee)
{
提示条.setText("连接失败");
}
if(socket!=null)
{
InetAddress address=socket.getInetAddress();
提示条.setText("连接:"+address+"成功");
用户提交昵称界面.setSocketConnection(socket,in,out);
north.validate();
}
if(thread==null)
{
thread=new Thread(this);
thread.start();
}
}
public void stop()
{
try
{
socket.close();
thread=null;
}
catch(IOException e)
{
this.showStatus(e.toString());
}
}
public void run()
{
while(thread!=null)
{
if(用户提交昵称界面.get能否聊天()==true)
{
用户聊天界面.setVisible(true);
用户聊天界面.setName(用户提交昵称界面.getName());
用户聊天界面.setSocketConnection(socket,in,out);
提示条.setText("祝聊天愉快!");
center.validate();
break;
}
try
{
Thread.sleep(100);
}
catch(Exception e)
{
}
}
}
}
InputNameTextField。java
import java.awt.*;
import java.net.*;
import java.awt.event.*;
import java.io.*;
import java.util.Hashtable;
public class InputNameTextField extends Panel implements ActionListener,Runnable
{
TextField nameFile=null;
String name=null;
Checkbox male=null,female=null;
CheckboxGroup group=null;
Button 进入聊天室=null,退出聊天室=null;
Socket socket=null;
DataInputStream in=null;
DataOutputStream out=null;
Thread thread=null;
boolean 能否聊天=false;
Hashtable listTable;
public InputNameTextField(Hashtable listTable)
{
this.listTable=listTable;
nameFile=new TextField(10);
group=new CheckboxGroup();
male=new Checkbox("男",true,group);
female=new Checkbox("女",false,group);
进入聊天室=new Button("进入");
退出聊天室=new Button("退出");
进入聊天室.addActionListener(this);
退出聊天室.addActionListener(this);
thread=new Thread(this);
add(new Label("昵称:"));
add(nameFile);
add(male);
add(female);
add(进入聊天室);
add(退出聊天室);
退出聊天室.setEnabled(false);
}
public void set能否聊天(boolean b)
{
能否聊天=b;
}
public boolean get能否聊天()
{
return 能否聊天;
}
public String getName()
{
return name;
}
public void setName(String s)
{
name=s;
}
public void setSocketConnection(Socket socket,DataInputStream in,DataOutputStream out)
{
this.socket=socket;
this.in=in;
this.out=out;
try{
thread.start();
}
catch(Exception e)
{
nameFile.setText(""+e);
}
}
public Socket getSocket()
{
return socket;
}
public void actionPerformed(ActionEvent e)
{
if(e.getSource()==进入聊天室)
{
退出聊天室.setEnabled(true);
if(能否聊天==true)
{
nameFile.setText("您正在聊天:"+name);
}
else
{
this.setName(nameFile.getText());
String sex=group.getSelectedCheckbox().getLabel();
if(socket!=nullname!=null)
{
try{
out.writeUTF("姓名:"+name+"性别:"+sex);
}
catch(IOException ee)
{
nameFile.setText("没有连通服务器"+ee);
}
}
}
}
if(e.getSource()==退出聊天室)
{
try
{
out.writeUTF("用户离开:");
}
catch(IOException ee)
{
}
}
}
public void run()
{
String message=null;
while(true)
{
if(in!=null)
{
try
{
message=in.readUTF();
}
catch(IOException e)
{
nameFile.setText("和服务器断开"+e);
}
}
if(message.startsWith("可以聊天:"))
{
能否聊天=true;
break;
}
else if(message.startsWith("聊天者:"))
{
String people=message.substring(message.indexOf(":")+1);
listTable.put(people,people);
}
else if(message.startsWith("不可以聊天:"))
{
能否聊天=false;
nameFile.setText("该昵称已被占用");
}
}
}
}
Q5: 用java编写 网络爬虫求代码和流程 急
import java.awt.*;
import java.awt.event.*;
import java.io.*;
import java.net.*;
import java.util.*;
import java.util.regex.*;
import javax.swing.*;
import javax.swing.table.*;//一个Web的爬行者(注：爬行在这里的意思与抓取，捕获相同)
public class SearchCrawler extends JFrame{
//最大URL保存值
private static final String[] MAX_URLS={"50","100","500","1000"};
//缓存robot禁止爬行列表
private HashMap disallowListCache=new HashMap();
//搜索GUI控件
private JTextField startTextField;
private JComboBox maxComboBox;
private JCheckBox limitCheckBox;
private JTextField logTextField;
private JTextField searchTextField;
private JCheckBox caseCheckBox;
private JButton searchButton;
//搜索状态GUI控件
private JLabel crawlingLabel2;
private JLabel crawledLabel2;
private JLabel toCrawlLabel2;
private JProgressBar progressBar;
private JLabel matchesLabel2;
//搜索匹配项表格列表
private JTable table;
//标记爬行机器是否正在爬行
private boolean crawling;
//写日志匹配文件的引用
private PrintWriter logFileWriter;
//网络爬行者的构造函数
public SearchCrawler(){
//设置应用程序标题栏
setTitle("搜索爬行者");
//设置窗体大小
setSize(600,600);
//处理窗体关闭事件
addWindowListener(new WindowAdapter(){
public void windowClosing(WindowEvent e){
actionExit();
}
});
//设置文件菜单
JMenuBar menuBar=new JMenuBar();
JMenu fileMenu=new JMenu("文件");
fileMenu.setMnemonic(KeyEvent.VK_F);
JMenuItem fileExitMenuItem=new JMenuItem("退出",KeyEvent.VK_X);
fileExitMenuItem.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent e){
actionExit();
}
});
fileMenu.add(fileExitMenuItem);
menuBar.add(fileMenu);
setJMenuBar(menuBar);
