Java--> Server Response (Servlet--doget&dopost)

--Servelet: for receiving requests (client, browser), responding, server-side, Java class

--Servletlogin--Java implementation of Web Project Server response

 PackageCom.dragon.java.servlet;Importjava.io.IOException;ImportJava.io.PrintWriter;Importjava.io.UnsupportedEncodingException;Importjavax.servlet.ServletException;ImportJavax.servlet.annotation.WebServlet;ImportJavax.servlet.http.HttpServlet;Importjavax.servlet.http.HttpServletRequest;ImportJavax.servlet.http.HttpServletResponse;/*** Servlet Implementation class Servletlogin*/@WebServlet ("/servletlogin") Public classServletloginextendsHttpServlet {Private Static Final LongSerialversionuid = 1L; protected voiddoget (httpservletrequest request, httpservletresponse response)throwsservletexception, IOException {String user= Parse (request.getparameter ("User")); String pwd= Parse (Request.getparameter ("pwd")); System.out.println (User+ ":" +pwd); Response.setcontenttype ("Text/html;charset=utf-8"); PrintWriter writer=Response.getwriter (); Writer.println (User+ "Successful landing!"); //The server will automatically turn off the stream    }    protected voidDoPost (httpservletrequest request, httpservletresponse response)throwsservletexception, IOException {request.setcharacterencoding ("Utf-8");//solve only POST request garbled problemdoget (request, response); }     PublicString Parse (String msg)throwsunsupportedencodingexception {return NewString (Msg.getbytes ("iso8859-1"), "Utf-8"); }}

1, Doget Method:

--Httpurlconnectionutil Tool class

 PackageCom.dragon.java.urlbyget;Importjava.io.IOException;ImportJava.io.InputStream;Importjava.net.HttpURLConnection;ImportJava.net.URL; Public classHttpurlconnectionutil { Public Staticinputstream getinputstreambyget (String url) {Try{HttpURLConnection conn= (httpurlconnection)Newurl (url). OpenConnection (); Conn.setrequestmethod ("GET"); Conn.setreadtimeout (10000); Conn.setconnecttimeout (10000); //Use this method to set the HTTP request header//conn.addrequestproperty ("Accept", "...");            if(Conn.getresponsecode () = =HTTPURLCONNECTION.HTTP_OK) {                //Get the encoding//String contentType = Conn.getcontenttype (); //string string = Contenttype.split ("=") [1];InputStream InputStream=Conn.getinputstream (); returnInputStream; }        } Catch(IOException e) {e.printstacktrace (); }        return NULL; }}

--Test class

 PackageCom.dragon.java.urlbyget;ImportJava.io.BufferedReader;Importjava.io.IOException;ImportJava.io.InputStream;ImportJava.io.InputStreamReader; Public classTest { Public Static voidMain (string[] args) {InputStream inputstreambyget=httpurlconnectionutil. Getinputstreambyget ("Http://www.baidu.com"); Try{bufferedreader br=NewBufferedReader (NewInputStreamReader (Inputstreambyget,"GB2312")); String Line= "";  while(line = Br.readline ())! =NULL) {System.out.println (line); }        } Catch(IOException e) {e.printstacktrace (); }    }}

----------------------------------the evil dividing line------------------------------------

2. DoPost method

--Httpurlconnectionutil Tool class

 PackageCom.dragon.java.urlbypost;Importjava.io.IOException;ImportJava.io.InputStream;ImportJava.io.OutputStream;Importjava.net.HttpURLConnection;ImportJava.net.URL; Public classHttpurlconnectionutil {Private StaticString CharSet;  Public Staticinputstream getinputstreambypost (string url, string parms) {Try{HttpURLConnection conn= (httpurlconnection)Newurl (url). OpenConnection (); Conn.setreadtimeout (5000); Conn.setconnecttimeout (5000); Conn.setrequestmethod ("POST"); Conn.setdooutput (true); OutputStream OutputStream=Conn.getoutputstream ();            Outputstream.write (Parms.getbytes ()); if(Conn.getresponsecode () = =HTTPURLCONNECTION.HTTP_OK) {String ContentType=Conn.getcontenttype (); CharSet= Contenttype.split ("=") [1]; InputStream InputStream=Conn.getinputstream (); returnInputStream; }        } Catch(IOException e) {e.printstacktrace (); }        return NULL; }     Public StaticString Getcharset () {returnCharSet; }}

--Inputstreamutil the conversion class to stream to string

 PackageCom.dragon.java.urlbypost;ImportJava.io.BufferedReader;Importjava.io.IOException;ImportJava.io.InputStream;ImportJava.io.InputStreamReader; Public classInputstreamutil { Public Staticstring inputstreamtostring (InputStream is, string charset) {StringBuffer sb=NewStringBuffer (); Try(BufferedReader br =NewBufferedReader (NewInputStreamReader (IS, CharSet));) {            Char[] buffer =New Char[1024]; intLen =-1;  while(len = br.read (buffer))! =-1) {sb.append (buffer,0, Len); }            returnsb.tostring (); } Catch(IOException e) {e.printstacktrace (); }        return NULL; }}

--Test class

 Package Com.dragon.java.urlbypost; Import Java.io.InputStream;  Public class Test {    publicstaticvoid  main (String args[]) {

　　　　The Chinese parameter in the URL needs to be encoded.
String user = Urlencoder.encode ("Zhang San", "Utf-8");
String pwd = urlencoder.encode ("Hello", "utf-8");
InputStream Inputstreambypost = Httpurlconnectionutil
. Getinputstreambypost (
"Http://192.168.2.11:8080/08-23/ServletLogin", "user="
+ user + "&pwd=" + pwd);

        System.out.println (inputstreamutil.inputstreamtostring (                inputstreambypost, Httpurlconnectionutil.getcharset ()));    }}

---> Note Import the Web project to the server and run ...

Java--> Server Response (Servlet--doget&dopost)