來源:http://www.bjsxt.com/
一、S02E205_01手寫服務器httpserver_xml配置文件_sax解析基礎
XML
package com.test.xml;
import java.io.IOException;
import java.util.List;
import javax.xml.parsers.ParserConfigurationException;
import javax.xml.parsers.SAXParser;
import javax.xml.parsers.SAXParserFactory;
import org.xml.sax.SAXException;
public class ParseDemo {
public static void main(String[] args) throws ParserConfigurationException, SAXException, IOException {
//1、獲取解析工廠
SAXParserFactory factory = SAXParserFactory.newInstance();
//2、從解析工廠獲取解析器
SAXParser parser = factory.newSAXParser();
//3、加載文檔Document註冊處理器
//4、編寫處理器
PersonHandler handler = new PersonHandler();
parser.parse(Thread.currentThread().getContextClassLoader()
.getResourceAsStream("com/test/xml/person.xml")
,handler);
List<Person> persons = handler.getPersons();
for (Person p : persons) {
System.out.println(p.getName() + "-->>" + p.getAge());
}
}
}
package com.test.xml;
import java.util.ArrayList;
import java.util.List;
import org.xml.sax.Attributes;
import org.xml.sax.SAXException;
import org.xml.sax.helpers.DefaultHandler;
/**
* 存儲對象
*/
public class PersonHandler extends DefaultHandler{
private List<Person> persons;
private Person person;
private String tag;//記錄標籤名
public List<Person> getPersons() {
return persons;
}
public void setPersons(List<Person> persons) {
this.persons = persons;
}
@Override
public void startDocument() throws SAXException {
//System.out.println("處理文檔開始");
persons = new ArrayList<Person>();
}
@Override
public void startElement(String uri, String localName, String qName,
Attributes attributes) throws SAXException {
System.out.println("開始一個元素" + qName);
if(null!=qName){
tag = qName;
}
if(null!=qName && qName.equals("person")){
person = new Person();
}
}
@Override
public void characters(char[] ch, int start, int length)
throws SAXException {
//System.out.println(new String(ch,start,length));
String str = new String(new String(ch,start,length));
if(null!=tag && tag.equals("name")){
person.setName(str);
}else if(null!=tag && tag.equals("age")){
Integer age = Integer.valueOf(str);
person.setAge(age);
}
}
@Override
public void endElement(String uri, String localName, String qName)
throws SAXException {
//System.out.println("結束一個元素" + qName);
if(qName.equals("person")){
this.persons.add(person);
}
tag = null;
}
@Override
public void endDocument() throws SAXException {
System.out.println("處理文檔結束");
}
}
package com.test.xml;
public class Person {
private String name;
private int age;
public Person() {
}
public Person(String name, int age) {
super();
this.name = name;
this.age = age;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public int getAge() {
return age;
}
public void setAge(int age) {
this.age = age;
}
}
控制檯輸出:
開始一個元素persons
開始一個元素person
開始一個元素name
開始一個元素age
開始一個元素person
開始一個元素name
開始一個元素age
處理文檔結束
至尊寶-->>9000
白晶晶-->>7000
二、S02E206_01手寫服務器httpserver_xml配置文件_sax解析應用
<html>
<head>
<title>第一個表單</title>
</head>
<body>
<form method="get" action="http://localhost:8888/g">
用戶名:<input type="text" name="uname" id="name">
密碼:<input type="password" name="pwd" id="pass">
<input type="submit" value="登錄">
</form>
</body>
</html>
web.xml文件
<?xml version="1.0" encoding="UTF-8" ?>
<web_app>
<servlet>
<servlet-name>login</servlet-name>
<servlet-class>com.test.server2.LoginServlet</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>login</servlet-name>
<url-pattern>/login</url-pattern>
<url-pattern>/log</url-pattern>
<url-pattern>/g</url-pattern>
</servlet-mapping>
<servlet>
<servlet-name>reg</servlet-name>
<servlet-class>com.test.server2.RegisterServlet</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>reg</servlet-name>
<url-pattern>/reg</url-pattern>
</servlet-mapping>
</web_app>
源碼:
package com.test.server2;
import java.io.IOException;
import java.net.ServerSocket;
import java.net.Socket;
/**
* 創建服務器,並啓動
* 1、請求
* 2、響應
*/
public class Server {
private ServerSocket server;
private boolean isShutDown = false;
public static void main(String[] args) {
Server server = new Server();
server.start();
}
/**
* 啓動方法
*/
public void start(){
start(8888);
}
/**
* 指定端口的啓動方法
*/
public void start(int port){
try {
server = new ServerSocket(port);
this.receive();
} catch (IOException e) {
//e.printStackTrace();
stop();
}
}
/**
* 接收客戶端
*/
private void receive(){
try {
//請求及響應
while(!isShutDown){
new Thread(new Dispatcher(server.accept())).start();
}
} catch (IOException e) {
//e.printStackTrace();
stop();
}
}
/**
* 停止服務器
*/
public void stop(){
isShutDown = true;
try {
if(!(null==server)){
server.close();
}
} catch (IOException e) {
//e.printStackTrace();
}
}
}
package com.test.server2;
import java.io.IOException;
import java.net.Socket;
/**
* 一個請求與響應,就一個對象
*/
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) {
//e.printStackTrace();
code = 500;
try {
rep.pushToClient(code);
} catch (IOException e1) {
//e1.printStackTrace();
}
return;
}
}
@Override
public void run() {
try {
Servlet serv = WebApp.getServlet(req.getUrl());
if(null==serv){
this.code = 404;//找不到處理
}else{
serv.service(req, rep);
}
rep.pushToClient(code);//推送到客戶端
} catch (Exception e) {
//e.printStackTrace();
this.code = 500;
try {
rep.pushToClient(code);
} catch (IOException e1) {
e1.printStackTrace();
}
}
try {
client.close();
} catch (IOException e) {
//e.printStackTrace();
}
}
}
package com.test.server2;
import java.io.IOException;
import java.io.InputStream;
import java.io.UnsupportedEncodingException;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.StringTokenizer;
/**
* 封裝request
*/
public class Request {
//請求方式
private String method;
//請求資源
private String url;
//請求參數
private Map<String,List<String>> parameterMapValues;
//內部
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[204800];
int len = is.read(data);
requestInfo = new String(data,0,len);
} catch (IOException e) {
return;
}
//分析請求信息
parseRequestInfo();
}
public String getUrl() {
return url;
}
public void setUrl(String url) {
this.url = url;
}
/**
* 分析請求信息
*/
private void parseRequestInfo(){
if((null==requestInfo) || (requestInfo=requestInfo.trim()).equals("")){
return;
}
/**
* ====================================
* 從信息的首行分解出:請求方式 請求路徑 請求參數(get可能存在)
* 如:GET /index.html?uname=intputUname&pwd=inputPassword HTTP/1.1
*
* 如果爲post方式,請求參數可能在最後正文中
* ====================================
*/
String paramString = "";//接收請求參數
int positionCRLF = 0;
positionCRLF = requestInfo.indexOf(CRLF);
if (positionCRLF == -1){
return;
}
//1、獲取請求方式
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")){//post方式
this.url = urlStr;
paramString = requestInfo.substring(requestInfo.lastIndexOf(CRLF)).trim();
}else if(this.method.equalsIgnoreCase("get")){//get方式
if(urlStr.contains("?")){
String[] urlArray = urlStr.split("\\?");
this.url = urlArray[0];
paramString = urlArray[1];//接收請求參數
}else{
this.url = urlStr;
}
}
//2、將請求參數封裝到Map中
parseParams(paramString);
}
/**
* 將請求參數封裝到Map中
* @param paramString
*/
private void parseParams(String paramString){
//分割,將字符串轉成數組
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");
//分揀,轉換成Map
if(!parameterMapValues.containsKey(key)){
parameterMapValues.put(key, new ArrayList<String>());
}
List<String> values = parameterMapValues.get(key);
values.add(value);
}
}
/**
* 解決中文
* @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;
}
/**
* 根據頁面的name獲取對應的多個值
*/
public String[] getParameterValues(String name){
List<String> values = null;
if( (values=parameterMapValues.get(name))==null ){
return null;
}else{
return values.toArray(new String[0]);
}
}
/**
* 根據頁面的name獲取對應的單個值
*/
public String getParameterValue(String name){
String[] values = getParameterValues(name);
if(null==values){
return null;
}
return values[0];
}
}
package com.test.server2;
import java.io.BufferedWriter;
import java.io.IOException;
import java.io.OutputStream;
import java.io.OutputStreamWriter;
import java.net.Socket;
import java.util.Date;
/**
* 封裝響應信息
*/
public class Response {
//兩個常量
public static final String CRLF = "\r\n";
public static final String BLANK = " ";
//流
private BufferedWriter bw;
//正文
private StringBuilder content;
//存儲頭信息
private StringBuilder headInfo;
//存儲正文長度
private int len = 0;
public Response(){
headInfo = new StringBuilder();
content = new StringBuilder();
len = 0;
}
public Response(OutputStream os){
this();
bw = new BufferedWriter(new OutputStreamWriter(os));
}
public Response(Socket client){
this();
try {
bw = new BufferedWriter(new OutputStreamWriter(client.getOutputStream()));
} catch (IOException e) {
headInfo = null;
}
}
/**
* 構建正文
*/
public Response print(String info){
content.append(info);
len += (info + CRLF).getBytes().length;
return this;
}
/**
* 構建正文+回車
*/
public Response println(String info){
content.append(info).append(CRLF);
len += (info + CRLF).getBytes().length;
return this;
}
/**
* 構建響應頭
*/
private void createHeadInfo(int code){
//1)HTTP協議版本、狀態代碼、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 500:
headInfo.append("Server Error");
break;
}
headInfo.append(CRLF);
//2)響應頭(Response Head)
headInfo.append("Server:test Server/0.0.1").append(CRLF);
headInfo.append("Date:").append(new Date()).append(CRLF);
headInfo.append("Content-type:text/html;charset=GBK").append(CRLF);
//正文長度:字節長度
headInfo.append("Content-Length:").append(len).append(CRLF);
headInfo.append(CRLF);
}
/**
* 推送到客戶端
* @throws IOException
*/
void pushToClient(int code) throws IOException{
if(null==headInfo){
code = 500;
}
createHeadInfo(code);
//頭信息+分割符
bw.append(headInfo.toString());
//正文
bw.append(content.toString());
bw.flush();
bw.close();
}
}
package com.test.server2;
import java.io.IOException;
import java.util.List;
import java.util.Map;
import javax.xml.parsers.ParserConfigurationException;
import javax.xml.parsers.SAXParser;
import javax.xml.parsers.SAXParserFactory;
public class WebApp {
private static ServletContext contxt;
static{
try {
//獲取解析工廠
SAXParserFactory factory = SAXParserFactory.newInstance();
//獲取解析器
SAXParser sax = factory.newSAXParser();
//指定xml + 處理器
WebHandler web = new WebHandler();
sax.parse(Thread.currentThread().getContextClassLoader()
.getResourceAsStream("com/test/server2/web.xml")
,web);
//將List轉成Map
contxt = new ServletContext();
Map<String,String> servlet = contxt.getServlet();
//servlet-name,servlet-class
for (Entity entity : web.getEntityList()) {
servlet.put(entity.getName(), entity.getClz());
}
//url-pattern,servlet-name
Map<String,String> mapping = contxt.getMapping();
for (Mapping mapp : web.getMappingList()) {
List<String> urls = mapp.getUrlPattern();
for (String url : urls) {
mapping.put(url, mapp.getName());
}
}
} catch (ParserConfigurationException e) {
e.printStackTrace();
} catch (org.xml.sax.SAXException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
}
public static Servlet getServlet(String url) throws InstantiationException, IllegalAccessException, ClassNotFoundException{
if(null==url || (url=url.trim()).equals("")){
return null;
}
//return contxt.getServlet().get(contxt.getMapping().get(url));
//根據字符串(完整路徑)創建對象
String name = contxt.getServlet().get(contxt.getMapping().get(url));
return (Servlet)Class.forName(name).newInstance();//確保空構造存在
}
}
package com.test.server2;
/**
* 抽象爲一個父類
*/
public abstract class Servlet {
public void service(Request req,Response rep) throws Exception{
this.doGet(req,rep);
this.doPost(req,rep);
}
public abstract void doGet(Request req,Response rep) throws Exception;
public abstract void doPost(Request req,Response rep) throws Exception;
}
package com.test.server2;
import java.util.HashMap;
import java.util.Map;
/**
* 上下文
*/
public class ServletContext {
//爲每一個servlet取別名
// login-->com.test.server2.LoginServlet
private Map<String,String> servlet;
// url-->login
// /log-->login
// /login-->login
private Map<String,String> mapping;
public ServletContext() {
servlet = new HashMap<String,String>();
mapping = new HashMap<String,String>();
}
public Map<String, String> getServlet() {
return servlet;
}
public void setServlet(Map<String, String> servlet) {
this.servlet = servlet;
}
public Map<String, String> getMapping() {
return mapping;
}
public void setMapping(Map<String, String> mapping) {
this.mapping = mapping;
}
}
package com.test.server2;
public class LoginServlet extends Servlet{
@Override
public void doGet(Request req,Response rep) throws Exception {
String name = req.getParameterValue("uname");
String pwd = req.getParameterValue("pwd");
if(login(name, pwd)){
rep.println("登錄成功");
}else{
rep.println("登錄失敗");
}
}
public boolean login(String name,String pwd){
return name.equals("test") && pwd.equals("12346");
}
@Override
public void doPost(Request req,Response rep) throws Exception {
}
}
package com.test.server2;
public class RegisterServlet extends Servlet{
@Override
public void doGet(Request req, Response rep) throws Exception {
}
@Override
public void doPost(Request req, Response rep) throws Exception {
rep.println("<html><head><title>返回註冊</title>");
rep.println("</head><body>");
rep.println("你的用戶名爲:" + req.getParameterValue("uname"));
rep.println("</body></html>");
}
}