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浅谈J2ME与JSP实现通信技巧

J2ME与JSP实现通信首先当然是要用以下三个类了:

HttpConnectionconn=null;//用于连接到web服务  
InputStreaminput=null;//用于接收返回信息  
DataOutputStreamoutput=null;//用于发送数据

（当然也可以用OutputStream,只是DataOutputStream有更多实用的方法）然后就是用conn=(HttpConnection)Connector.open(url)方法来建立连接

url是String类型的如

Stringurl="http://202.103.191.61:80/test.jsp";  
stringurl2="http://www.express.com/test.jsp";

如果是用ip地址作为参数一定要加上端口号，用网址可不用默认就是80嘛！

接着设置web服务接收的一些参数

conn.setRequestMethod(HttpConnection.POST);//也可以用get  
conn.setRequestProperty("IF-Modified-Since","29May200415:17:19GMT");  
conn.setRequestProperty("User-Agent","Profile/MIDP-1.0Configuration/CLDC-1.0");  
conn.setRequestProperty("Content-Language","en-CA");  
conn.setRequestProperty("Content-Type","application/x-www-form-urlencoded");

打开输出流，传数据

output=c.openDataOutputStream();  
output.writeUTF("&test1="+test1);  
output.writeUTF("&test2="+test2);  
output.writeUTF("&test3="+test3);  
output.writeUTF("&test4="+test4);  
output.flush();

到这里实际上就是我们在浏览器中输入http//202.103.191.61:80/test.jsp&test1=test1&test2=test2&test3=test3&test4=test4
注意到没有test.jsp后面全是&参数名=值第一个不是以?开头(但如果参数是只有一个或两个时可以不第一个不用&都行，不知道为什么)!

然后就是取得返回信息了，

input=c.openDataInputStream();  
intch;  
StringBufferb=newStringBuffer;  
while((ch=is.read())!=-1){  
b.append((char)ch);  
System.out.println(b);  
}

最后别忘闭流!

JSP程序里就是用request.getParameter();来取数据，然后进行处理啦，就不多说了!

附J2ME与JSP实现通信源码

importjavax.microedition.lcdui.*;  
importjavax.microedition.midlet.*;  
importjavax.microedition.io.*;  
importjava.io.*;  
 
publicclassSendTestMidletextendsMIDletimplementsCommandListener{  
Displaydisplay=null;  
TextFieldttest1,ttest2,ttest3,ttest4;  
Formform;  
Stringurl="http://202.103.191.61:80/test.jsp";  
staticfinalCommandsend=newCommand("注册",Command.OK,2);  
staticfinalCommandexit=newCommand("退出",Command.EXIT,2);  
Stringmyname,pas1,pas2,test4;  
publicSendTestMidlet(){  
display=Display.getDisplay(this);  
ttest1=newTextField("Name:","",25,TextField.ANY);  
ttest2=newTextField("password:","",25,TextField.ANY);  
ttest3=newTextField("password2:","",25,TextField.ANY);  
ttest4=newTextField("note:","",25,TextField.ANY);  
form=newForm("注册信息");  
}  
publicvoidstartApp()throwsMIDletStateChangeException{  
form.append(ttest1);  
form.append(ttest2);  
form.append(ttest3);  
form.append(ttest4);  
form.addCommand(send);  
form.addCommand(exit);  
form.setCommandListener(this);  
display.setCurrent(form);  
}  
publicvoidpauseApp(){  
}  
publicvoiddestroyApp(booleanunconditional){  
notifyDestroyed();  
}  
publicvoidsendData(Stringurl)throwsIOException{  
HttpConnectionconn=null;  
InputStreaminput=null;  
DataOutputStreamoutput=null;  
StringBufferb=newStringBuffer();  
TextBoxt=null;  
try{  
conn=(HttpConnection)Connector.open(url);  
conn.setRequestMethod(HttpConnection.POST);  
conn.setRequestProperty("IF-Modified-Since","29Dec200115:17:19GMT");  
conn.setRequestProperty("User-Agent","Profile/MIDP-1.0Configuration/CLDC-1.0");  
conn.setRequestProperty("Content-Language","en-CA");  
conn.setRequestProperty("Content-Type","application/x-www-form-urlencoded");  
output=conn.openDataOutputStream();  
output.writeUTF("&name="+myname);  
output.writeUTF("&pas1="+pas1);  
output.writeUTF("&pas2="+pas2);  
output.writeUTF("&test4="+test4);//.getBytes());  
output.flush();  
input=conn.openDataInputStream();  
intch;  
while((ch=input.read())!=-1){  
b.append((char)ch);  
System.out.print((char)ch);  
}  
t=newTextBox("Date",b.toString(),1024,0);  
t.setCommandListener(this);  
}  
finally{  
if(input!=null){  
input.close();  
}  
if(output!=null){  
output.close();  
}  
if(conn!=null){  
conn.close();  
}  
}  
display.setCurrent(t);  
}  
 
publicvoidcommandAction(Commandconn,Displayabled){  
Stringlabel=conn.getLabel();  
if(label.equals("exit")){  
destroyApp(true);  
}elseif(label.equals("date?")){  
myname=ttest1.getString();  
pas1=ttest2.getString();  
pas2=ttest3.getString();  
test4=ttest4.getString();  
try{  
sendData(url);  
}catch(IOExceptione){}  
}  
}  
}