STRUTS2 's JSON plugin

1. Introduction of JSON plug-in package

<!--Introducing Struts2 JSON plugins--<dependency> <groupId>org.apache.struts</groupId> <a Rtifactid>struts2-json-plugin</artifactid> <version>${struts.version}</version> </depend Ency>

2. Configure xml,extends= "Json-default", <result name= "Success" type= "JSON" ></result>

<?xml version= "1.0"? ><! DOCTYPE struts Public "-//apache software foundation//dtd struts Configuration 2.1.7//en" "http://struts.apache.org/        Dtds/struts-2.1.7.dtd "><struts> <package name=" indexpackage "namespace="/"extends=" Json-default "> <action name= "indexaction_*" class= "indexaction" method= "{1}" > <result name= "Success" type= "JSON" ;</result> </action> </package></struts>

3. Use in action

package cn.sniper.project.action;import org.apache.struts2.json.annotations.json; @Controller (" Indexaction ") @Scope (" prototype ") public class indexaction extends baseaction<uservo>  {        private static final long  serialversionuid = -8269406543148672672l;    //login default is fail      private string login = fail;        /**      *  Jump to the login page      *  @return       */    public string login ()  {         return login;    }        /**      *  Sign in      *  @return       */    public striNg dologin ()  {        UserVo user =  This.getmodel ();         if (User.getusername (). Equals (User.getPassword ( )))  {                         this.setlogin (SUCCESS);                         // JSON can only get the stack top element             super.push (This.login);                          return success;        }  else {            throw new  RuntimeException ();         }    }        /**      *  after successful login home      *  @return       */    public string index ()  {         return index;    }        @ JSON (name= "login")     public string getlogin ()  {         return login;    }    public void  setlogin (String login)  {        this.login =  login;    }}

4. JSON Related:

A, the JSON object passed to the page is stack top element B, rename the JSON object @JSON (name= "login") public String GetLogin () {return login;    }c, setting property does not do JSON serialization @JSON (serialize=false) public String GetLogin () {return login;    } d, formatted date @JSON (format= "YYYY-MM-DD") public String getDate () {return date; }

5, the JSON plug-in principle, view the Struts2-json-plugin.jar root directory under the Struts-plugin.xml file, found that Json-default itself inherits from Struts-default, and custom type JSON:

<?xml version= "1.0"  encoding= "UTF-8"  ?><! doctype struts public     "-//apache software foundation//dtd  struts configuration 2.3//en "    " HTTP://STRUTS.APACHE.ORG/DTDS/STRUTS-2.3.DTD " ><struts>    <package name= "Json-default"  extends= "Struts-default" >        <result-types>             <result-type name= "JSON"  class= " Org.apache.struts2.json.JSONResult "/>        </result-types>         <interceptors>             <interceptor name= "JSON"  class= " Org.apache.struts2.json.JSONInterceptor "/>             <intercepTor name= "Jsonvalidation"  class= "Org.apache.struts2.json.JSONValidationInterceptor"/>             <!-- sample json validation  stack -->            < Interceptor-stack name= "Jsonvalidationworkflowstack" >                 <interceptor-ref name= "BasicStack"/>                 <interceptor-ref  Name= "Validation" >                     <param name= "Excludemethods" >input,back,cancel</param>                 </ interceptor-ref>                 <interceptor-ref name= " Jsonvalidation "/>                 <interceptor-ref name= "Workflow"/>             </interceptor-stack>        </interceptors >    </package></struts>

6. Visit the page:

$.ajax ({                url  : baseURL +  '/indexaction_dologin.action ',                 type :  ' Post ',                 data : {                     username  :  $ (' #username '). Val (),                     password : $ (' #password '). Val (),                 },                 beforeSend : function  ()  {      &nBsp;              $.messager.progress ({                          text :  ' Logging in ... ',                     });                 },                 success : function  (data,  Response, status)  {                     $.messager.progress (' close ');                                          /**                      *  Why does data not use a Boolean type?                       *          because if data is not NULL, it is a true value. This will cause the login to be successful if the login failure returns a non-null value                       */                     if (data== "Success")  {                          location.href = baseURL +  '/indexaction_index.action ';                     } else {                          $.messager.alert (' Login failed! ',  ' username or password is wrong! ',  ' warning ', function  ()  {                             $ ( ' #password '). Select ();                         });                     }                 }             });

STRUTS2 's JSON plugin