Java and flex Study Notes (21) -- WebService for communication between flex and Java

Today, the third method of communication between flex and Java is finally completed. I didn't figure it out because I don't know how to create a WebService. The free weather forecast service is used on the Internet. All right, you just want to learn this communication style for weather forecast, but I am not sure. Fortunately, we finally got it out today.

We know that flex and Java have three communication methods:

1. Flex communicates with common Java classes through remoteobject.

2. Flex communicates with the server class through httpservice, such as servlet.

3. Flex communicates with Java through WebService.

I will not talk about WebService, but flex uses WebService to communicate with Java in a very simple way.

Create a WebService address.

Create a web project webservicedemo in eclipse and create a loginservice. Java class in it. The Code is as follows:

package com.ldfsoft.service; public classLoginService {    public boolean login(Stringusername,String passworld){       boolean result=false;       if("admin".equals(username)&&"123".equals(passworld)){           result=true;       }       return result;    }}

 

This class has a method login (), which is very simple.

Right-click the class and choose WebService à ---> creata web service, as shown in:

Select the default configuration and click "finish". eclipse will automatically create a WebService address for us.

Next we will test the WebService we just created. In the address bar, enter http: // localhost: 8000/webservicedemo/services/loginservice? WSDL. If the page is shown below, the configuration is successful:

Then, use WebService to communicate in flex.

Create a new Flex page webservicedemo. mxml with the following code:

<? XML version = "1.0" encoding = "UTF-8"?> <S: Application xmlns: FX = "http://ns.adobe.com/mxml/2009" xmlns: S = "Library: // ns.adobe.com/flex/spark" xmlns: MX = "Library: // ns.adobe.com/flex/mx "minwidth =" 955 "minheight =" 600 "pagetitle =" WebService test "> <FX: style> @ namespace s" Library: // ns.adobe.com/flex/spark "; @ namespace MX "Library: // ns.adobe.com/flex/mx ";. TXT {fontsize: 18 ;}</FX: style> <FX: SCRIPT> <! [CDATA [import MX. controls. alert; importmx. RPC. events. faultevent; importmx. RPC. events. resultevent; protected function operation=resulthandler (Event: resultevent): void {// todo auto-generated method stub varresult: Boolean = event. result as Boolean; If (result) {alert. show ("Login successful ~ "," Prompt ");} else {alert. Show (" Logon Failed ~ "," Prompt ") ;}} protected functionoperation=faulthandler (Event: faultevent): void {// todo auto-generated method stub alert. show (event. fault. message, "prompt");} protected functionlogin_clickhandler (Event: mouseevent): void {// todo auto-generated method stub // send request webser. login. send () ;}]]> </FX: SCRIPT> <FX: declarations> <! -- Note that the number and sequence of parameters in WebService must be the same as those in the publishing address --> <s: WebService id = "webser" WSDL = "http: // localhost: 8000/webservicedemo/services/loginservice? WSDL "> <s: Operation name =" login "result =" operationtransferresulthandler (event) "fault =" operationtransferfaulthandler (event) "> <s: Request> <username> {username. text} </username> <passworld> {password. text} </passworld> </S: Request> </S: Operation> </S: WebService> </FX: declarations> <s: label x = "351" Y = "158" text = "account:" fontsize = "18" stylename = "TXT"/> <s: textinput x = "439" Y = "154" id = "username" stylename = "TXT"/> <s: label x = "351" Y = "201" text = "Password:" fontsize = "18" id = "password_txt" stylename = "TXT"/> <s: textinput x = "441" Y = "196" id = "password" stylename = "TXT" displayaspassword = "true"/> <s: button x = "461" Y = "273" Height = "34" label = "login" fontsize = "18" id = "login" stylename = "TXT" Click = "login_clickhandler (Event) "/> </S: Application>

Next, run the page. If the user name is "admin" and the password is "123" and the login is successful, otherwise, the communication is successful.

Note: If you understand WebService, you will understand that they send data by assembling the data into XML. In this example, the WebService is created in the webservicedemo project, while the flex page is in another project. We can know that WebService can be a bridge for communication between different projects!

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