使用HttpCore（HttpComponents）在android上构建webService

使用HttpCore可以非常简单的构建HttpServer，HttpCore可以处理Http协议层。

工程里需要引入httpcore.jar，客户端开发需要引入httpclient.jar，下载地址：http://hc.apache.org/downloads.cgi。

服务器端代码如下（get请求返回“<xml><method>get</method><url>&uri</url></xml>"， post请求返回“<xml><method>post</method><url>&uri</url></xml>"）：

package com.mytest.http;
import java.io.File;
import java.io.IOException;
import java.io.InterruptedIOException;
import java.net.ServerSocket;
import java.net.Socket;
import java.net.URLDecoder;
import java.nio.charset.Charset;
import java.util.Locale;
import org.apache.http.ConnectionClosedException;
import org.apache.http.HttpEntity;
import org.apache.http.HttpEntityEnclosingRequest;
import org.apache.http.HttpException;
import org.apache.http.HttpRequest;
import org.apache.http.HttpResponse;
import org.apache.http.HttpResponseInterceptor;
import org.apache.http.HttpServerConnection;
import org.apache.http.HttpStatus;
import org.apache.http.MethodNotSupportedException;
import org.apache.http.entity.ContentType;
import org.apache.http.entity.FileEntity;
import org.apache.http.entity.StringEntity;
import org.apache.http.impl.DefaultConnectionReuseStrategy;
import org.apache.http.impl.DefaultHttpResponseFactory;
import org.apache.http.impl.DefaultHttpServerConnection;
import org.apache.http.params.BasicHttpParams;
import org.apache.http.params.CoreConnectionPNames;
import org.apache.http.params.CoreProtocolPNames;
import org.apache.http.params.HttpParams;
import org.apache.http.protocol.BasicHttpContext;
import org.apache.http.protocol.HttpContext;
import org.apache.http.protocol.HttpProcessor;
import org.apache.http.protocol.HttpRequestHandler;
import org.apache.http.protocol.HttpRequestHandlerRegistry;
import org.apache.http.protocol.HttpService;
import org.apache.http.protocol.ImmutableHttpProcessor;
import org.apache.http.protocol.ResponseConnControl;
import org.apache.http.protocol.ResponseContent;
import org.apache.http.protocol.ResponseDate;
import org.apache.http.protocol.ResponseServer;
import org.apache.http.util.EntityUtils;
/**
* Basic, yet fully functional and spec compliant, HTTP/1.1 file server.
* <p>
* Please note the purpose of this application is demonstrate the usage of
* HttpCore APIs. It is NOT intended to demonstrate the most efficient way of
* building an HTTP file server.
*
*
*/
publicclassHttpServer{
publicstaticvoid main(String[] args)throwsException{
Thread t =newRequestListenerThread(8080);
t.setDaemon(false);
t.start();//start the webservice server
}
staticclassWebServiceHandlerimplementsHttpRequestHandler{
publicWebServiceHandler(){
super();
}
publicvoid handle(finalHttpRequest request,
finalHttpResponse response,finalHttpContext context)
throwsHttpException,IOException{
String method = request.getRequestLine().getMethod()
.toUpperCase(Locale.ENGLISH);
//get uri
String target = request.getRequestLine().getUri();
if(method.equals("GET")){
response.setStatusCode(HttpStatus.SC_OK);
StringEntity entity =newStringEntity("<xml><method>get</method><url>"+ target +"</url></xml>");
response.setEntity(entity);
}
elseif(method.equals("POST"))
{
response.setStatusCode(HttpStatus.SC_OK);
StringEntity entity =newStringEntity("<xml><method>post</method><url>"+ target +"</url></xml>");
response.setEntity(entity);
}
else
{
thrownewMethodNotSupportedException(method
+" method not supported");
}
}
}
staticclassRequestListenerThreadextendsThread{
privatefinalServerSocket serversocket;
privatefinalHttpParamsparams;
privatefinalHttpService httpService;
publicRequestListenerThread(int port)
throwsIOException{
//
this.serversocket =newServerSocket(port);
// Set up the HTTP protocol processor
HttpProcessor httpproc =newImmutableHttpProcessor(
newHttpResponseInterceptor[]{
newResponseDate(),newResponseServer(),
newResponseContent(),newResponseConnControl()});
this.params=newBasicHttpParams();
this.params
.setIntParameter(CoreConnectionPNames.SO_TIMEOUT,5000)
.setIntParameter(CoreConnectionPNames.SOCKET_BUFFER_SIZE,
8*1024)
.setBooleanParameter(
CoreConnectionPNames.STALE_CONNECTION_CHECK,false)
.setBooleanParameter(CoreConnectionPNames.TCP_NODELAY,true)
.setParameter(CoreProtocolPNames.ORIGIN_SERVER,
"HttpComponents/1.1");
// Set up request handlers
HttpRequestHandlerRegistry reqistry =newHttpRequestHandlerRegistry();
reqistry.register("*",newWebServiceHandler());//WebServiceHandler用来处理webservice请求。
this.httpService =newHttpService(httpproc,
newDefaultConnectionReuseStrategy(),
newDefaultHttpResponseFactory());
httpService.setParams(this.params);
httpService.setHandlerResolver(reqistry);//为http服务设置注册好的请求处理器。
}
@Override
publicvoid run(){
System.out.println("Listening on port "
+this.serversocket.getLocalPort());
System.out.println("Thread.interrupted = "+Thread.interrupted());
while(!Thread.interrupted()){
try{
// Set up HTTP connection
Socket socket =this.serversocket.accept();
DefaultHttpServerConnection conn =newDefaultHttpServerConnection();
System.out.println("Incoming connection from "
+ socket.getInetAddress());
conn.bind(socket,this.params);
// Start worker thread
Thread t =newWorkerThread(this.httpService, conn);
t.setDaemon(true);
t.start();
}catch(InterruptedIOException ex){
break;
}catch(IOException e){
System.err
.println("I/O error initialising connection thread: "
+ e.getMessage());
break;
}
}
}
}
staticclassWorkerThreadextendsThread{
privatefinalHttpService httpservice;
privatefinalHttpServerConnection conn;
publicWorkerThread(finalHttpService httpservice,
finalHttpServerConnection conn){
super();
this.httpservice = httpservice;
this.conn = conn;
}
@Override
publicvoid run(){
System.out.println("New connection thread");
HttpContext context =newBasicHttpContext(null);
try{
while(!Thread.interrupted()&&this.conn.isOpen()){
this.httpservice.handleRequest(this.conn, context);
}
}catch(ConnectionClosedException ex){
System.err.println("Client closed connection");
}catch(IOException ex){
System.err.println("I/O error: "+ ex.getMessage());
}catch(HttpException ex){
System.err.println("Unrecoverable HTTP protocol violation: "
+ ex.getMessage());
}finally{
try{
this.conn.shutdown();
}catch(IOException ignore){
}
}
}
}
}

客户端代码如下（注意，在android 3.0及其后版本中，此端代码不能在main主线程里工作，否则会报网络异常导致退出）：

DefaultHttpClient client =newDefaultHttpClient();
HttpGet httpGet =newHttpGet(”http://localhost:8080/“);
HttpResponse httpResponse = client.execute(httpGet);
if(httpResponse.getStatusLine().getStatusCode()==200){
response =EntityUtils.toString(httpResponse.getEntity());
}

使用HttpCore（HttpComponents）在android上构建webService

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