封装Response:
/**
* 封装响应信息
*/
public class Response {
//两个常量
public static final String CRLF="\r\n";
public static final String BLANK=" ";
//流
private BufferedWriter bw ;
//正文
private StringBuilder content;
//存储头信息
private StringBuilder headInfo;
//存储正文长度
private int len = 0;
public Response(){
headInfo = new StringBuilder();
content = new StringBuilder();
len = 0;
}
public Response(Socket client){
this();
try {
bw = new BufferedWriter(new OutputStreamWriter(client.getOutputStream()));
} catch (IOException e) {
headInfo=null;
}
}
public Response(OutputStream os){
this();
bw = new BufferedWriter(new OutputStreamWriter(os));
}
/**
* 构建正文
*/
public Response print(String info){
content.append(info);
len += info.getBytes().length;
return this;
}
/**
* 构建正文+回车
*/
public Response println(String info){
content.append(info).append(CRLF);
len += (info+CRLF).getBytes().length;
return this;
}
/**
* 构建响应头
*/
private void createHeadInfo(int code){
//1) HTTP协议版本、状态代码、描述
headInfo.append("HTTP/1.1").append(BLANK).append(code).append(BLANK);
switch(code){
case 200:
headInfo.append("OK");
break;
case 404:
headInfo.append("NOT FOUND");
break;
case 505:
headInfo.append("SEVER ERROR");
break;
}
headInfo.append(CRLF);
//2) 响应头(Response Head)
headInfo.append("Server:bjsxt Server/0.0.1").append(CRLF);
headInfo.append("Date:").append(new Date()).append(CRLF);
headInfo.append("Content-type:text/html;charset=GBK").append(CRLF);
//正文长度 ：字节长度
headInfo.append("Content-Length:").append(len).append(CRLF);
headInfo.append(CRLF); //分隔符
}
//推送到客户端
void pushToClient(int code) throws IOException{
if(null==headInfo){
code =500;
}
createHeadInfo(code);
//头信息+分割符
bw.append(headInfo.toString());
//正文
bw.append(content.toString());
bw.flush();
}
public void close(){
CloseUtil.closeIO(bw);
}
}
测试：
/**
* 创建服务器，并启动
* 1、请求
* 2、响应
*/
public class Server4 {
private ServerSocket server;
public static final String CRLF="\r\n";
public static final String BLANK=" ";
public static void main(String[] args) {
Server4 server = new Server4();
server.start();
}
/**
* 启动方法
*/
public void start(){
try {
server = new ServerSocket(8888);
this.receive();
} catch (IOException e) {
e.printStackTrace();
}
}
/**
* 接收客户端
*/
private void receive(){
try {
Socket client =server.accept();
byte[] data=new byte[20480];
int len =client.getInputStream().read(data);
//接收客户端的请求信息
String requestInfo=new String(data,0,len).trim();
System.out.println(requestInfo);
//响应
Response rep=new Response(client.getOutputStream());
rep.println("<html><head><title>HTTP响应示例</title>");
rep.println("</head><body>Hello server!</body></html>");
rep.pushToClient(200);
} catch (IOException e) {
}
}
public void stop(){
}
}
封装Request：
/**
* 封装request
*/
public class Request {
//请求方式
private String method;
//请求资源
private String url;
//请求参数
private Map<String,List<String>> parameterMapValues;
//内部
public static final String CRLF="\r\n";
private InputStream is;
private String requestInfo;
public Request(){
method ="";
url ="";
parameterMapValues=new HashMap<String,List<String>>();
requestInfo="";
}
public Request(InputStream is){
this();
this.is=is;
try {
byte[] data = new byte[20480];
int len = is.read(data);
requestInfo = new String(data, 0, len);
} catch (Exception e) {
return ;
}
//分析请求信息
parseRequestInfo();
}
/**
* 分析请求信息
*/
private void parseRequestInfo(){
if(null==requestInfo ||(requestInfo=requestInfo.trim()).equals("")){
return ;
}
/**
* =====================================
* 从信息的首行分解出 :请求方式 请求路径 请求参数(get可能存在)
* 如:GET /index.html?name=123&pwd=5456 HTTP/1.1
*
* 如果为post方式，请求参数可能在 最后正文中
*
* 思路:
* 1)请求方式 :找出第一个/ 截取即可
* 2)请求资源:找出第一个/ HTTP/
* =====================================
*/
String paramString =""; //接收请求参数
//1、获取请求方式
String firstLine =requestInfo.substring(0,requestInfo.indexOf(CRLF));
int idx =requestInfo.indexOf("/"); // /的位置
this.method=firstLine.substring(0, idx).trim();
String urlStr =firstLine.substring(idx,firstLine.indexOf("HTTP/")).trim();
if(this.method.equalsIgnoreCase("post")){
this.url=urlStr;
paramString=requestInfo.substring(requestInfo.lastIndexOf(CRLF)).trim();
}else if(this.method.equalsIgnoreCase("get")){
if(urlStr.contains("?")){ //是否存在参数
String[] urlArray=urlStr.split("\\?");
this.url=urlArray[0];
paramString=urlArray[1];//接收请求参数
}else{
this.url=urlStr;
}
}
//不存在请求参数
if(paramString.equals("")){
return ;
}
//2、将请求参数封装到Map中
parseParams(paramString);
}
private void parseParams(String paramString){
//分割 将字符串转成数组
StringTokenizer token=new StringTokenizer(paramString,"&");
while(token.hasMoreTokens()){
String keyValue =token.nextToken();
String[] keyValues=keyValue.split("=");
if(keyValues.length==1){
keyValues =Arrays.copyOf(keyValues, 2);
keyValues[1] =null;
}
String key = keyValues[0].trim();
String value = null==keyValues[1]?null:decode(keyValues[1].trim(),"gbk");
//转换成Map 分拣
if(!parameterMapValues.containsKey(key)){
parameterMapValues.put(key,new ArrayList<String>());
}
List<String> values =parameterMapValues.get(key);
values.add(value);
}
}
/**
* 解决中文
* @param value
* @param code
* @return
*/
private String decode(String value,String code){
try {
return java.net.URLDecoder.decode(value, code);
} catch (UnsupportedEncodingException e) {
//e.printStackTrace();
}
return null;
}
/**
* 根据页面的name 获取对应的多个值
* @param args
*/
public String[] getParameterValues(String name){
List<String> values=null;
if((values=parameterMapValues.get(name))==null){
return null;
}else{
return values.toArray(new String[0]);
}
}
/**
* 根据页面的name 获取对应的单个值
* @param args
*/
public String getParameter(String name){
String[] values =getParameterValues(name);
if(null==values){
return null;
}
return values[0];
}
public String getUrl() {
return url;
}
}
测试：
/**
* 创建服务器，并启动
* 1、请求
* 2、响应
*/
public class Server5 {
private ServerSocket server;
public static final String CRLF="\r\n";
public static final String BLANK=" ";
public static void main(String[] args) {
Server5 server = new Server5();
server.start();
}
/**
* 启动方法
*/
public void start(){
try {
server = new ServerSocket(8888);
this.receive();
} catch (IOException e) {
e.printStackTrace();
}
}
/**
* 接收客户端
*/
private void receive(){
try {
Socket client =server.accept();
//请求
Request req=new Request(client.getInputStream());
//响应
Response rep=new Response(client.getOutputStream());
rep.println("<html><head><title>HTTP响应示例</title>");
rep.println("</head><body>");
rep.println("欢迎:").println(req.getParameter("uname")).println("回来");
rep.println("</body></html>");
rep.pushToClient(200);
} catch (IOException e) {
}
}
/**
* 停止服务器
*/
public void stop(){
}
}
加入Servlet：
public class Servlet {
public void service(Request req,Response rep){
rep.println("<html><head><title>HTTP响应示例</title>");
rep.println("</head><body>"); rep.println("欢迎:").println(req.getParameter("uname")).println("回来");
rep.println("</body></html>");
}
}
/**
* 接收客户端
*/
private void receive(){
try {
Socket client =server.accept();
Servlet serv =new Servlet();
Request req =new Request(client.getInputStream());
Response rep =new Response(client.getOutputStream());
serv.service(req,rep);
rep.pushToClient(200); //通过流写出去
} catch (IOException e) {
}
}
服务端利用多线程：
/**
* 创建服务器，并启动
* 1、请求
* 2、响应
*/
public class Server7 {
private ServerSocket server;
public static final String CRLF="\r\n";
public static final String BLANK=" ";
private boolean isShutDown= false;
public static void main(String[] args) {
Server7 server = new Server7();
server.start();
}
/**
* 启动方法
*/
public void start(){
start(8888);
}
/**
* 指定端口的启动方法
*/
public void start(int port){
try {
server = new ServerSocket(port);
this.receive();
} catch (IOException e) {
//e.printStackTrace();
stop();//启动出错则stop。
}
}
/**
* 接收客户端
*/
private void receive(){
try {
while(!isShutDown){
new Thread(new Dispatcher(server.accept())).start();
}
} catch (IOException e) {
stop();
}
}
/**
* 停止服务器
*/
public void stop(){
isShutDown=true;
CloseUtil.closeSocket(server);
}
}
/**
* 一个请求与响应 就一个此对象
*/
public class Dispatcher implements Runnable{
private Socket client;
private Request req;
private Response rep;
private int code=200;
Dispatcher(Socket client){
this.client=client;
try {
req =new Request(client.getInputStream());
rep =new Response(client.getOutputStream());
} catch (IOException e) {
code =500;//统一到推送地方去推送。
return ;
}
}
@Override
public void run() {
Servlet serv =new Servlet();
serv.service(req,rep);
try {
rep.pushToClient(code); //流推送到客户端
} catch (IOException e) {
}
try {
rep.pushToClient(500);
} catch (IOException e) {
e.printStackTrace();
}
CloseUtil.closeSocket(client);
}
}
public class CloseUtil {
/**
* 关闭IO流
*/
/*
public static void closeIO(Closeable... io){
for(Closeable temp:io){
try {
if (null != temp) {
temp.close();
}
} catch (Exception e) {
}
}
}*/
/**
* 使用泛型方法实现关闭IO流
* @param io
*/
public static <T extends Closeable> void closeIO(T... io){
for(Closeable temp:io){
try {
if (null != temp) {
temp.close();
}
} catch (Exception e) {
}
}
}
public static void closeSocket(ServerSocket socket){
try {
if (null != socket) {
socket.close();
}
} catch (Exception e) {
}
}
public static void closeSocket(Socket socket){
try {
if (null != socket) {
socket.close();
}
} catch (Exception e) {
}
}
public static void closeSocket(DatagramSocket socket){
try {
if (null != socket) {
socket.close();
}
} catch (Exception e) {
}
}
}
