[Go] About Struts-json configuration (detailed JSON data support with instance struts2)

About Struts-json to improve development efficiency first, what is JSON? : JSON (JavaScript Object Notation) is a lightweight data interchange format. Easy to read and write, but also easy to machine solution. Analysis and generation. It is based on a subset of JavaScript (standard ECMA-262 3rd edition-december 1999). JSON takes a completely language-independent text format, but also uses a similar idiom to the C language family (c, C, C #, Java, JavaScript, Perl, Python, etc.). These features make JSON an ideal data exchange language. Ii. What support does struts2 have for JSON? : Struts2 provides a struts2-json-plugin.jar to support the use of JSON. When we use JSON in Struts2, Must import Struts2-json-plugin.jar And I need a few points: 1.<package name= "struts2" extends= "Json-default" > Must be inherited from the definition in the Struts-plugin.xml file in Struts2-json-plugin.jar Json-default Struts-plugin.xml configuration information in/*struts2-json-plugin.jar: <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"/> &L T;/interceptors> </package> </struts> By configuring the information we can know: 1.json-default actually inherited the Struts-default. 2. Defines a return type named JSON and an interceptor with the name JSON */ 2.<action name= "*" class= "*" ><result name= "Success" type= "JSON"/></action>//we need to set the result The return type is defined as JSON third, the function of some properties of JSON in Struts.xml. Java code <action name= "*" class= "*" > <result name= "Success" type= "JSON" > <param name= "" ></param>//Some definitions of JSON /*excludeproperties//represents excluding which properties in the action, when excluding multiple attributes, separated by commas (that is, properties that do not require serialization) Example: <param name= "excludeproperties" >age</param> exclude Getage () How this method is excluded this method is explained below Includeproperties//represents which properties are included in the action, including multiple attributes, separated by commas (that is, properties that need serialization) Example: <param name= "Includeproperties" >address</param> contains getaddress () This method is included in the following explanation Excludenullproperties//Represents a field in which an empty property value is excluded from action Example: <param name= "excludenullproperties" >true</param> using true/false default to False (that is, a field containing a null property value) Root//represents where to start serialization Example: <param name= "root" >person</param> person can be a property or an object or a collection When defined here, only the person is serialized, and if the person is an object, all getter methods in the person object are serialized Note: If the same attribute defines both Excludeproperties and includeproperties Then the priority of the excludeproperties is high, so it is not Serialization of this property */ </result> </action> Iv. about the use of JSON in the Action object annotation. : For JSON annotations There are a few properties that you can defineName: Specify the names for serialization/* Example: @JSON (name = "MyName") the username attribute corresponds to the JSON received by the client: {myname: "Zhang San"} was previously {username: "Zhang San"}Public String GetUserName () {return username;     }*/Serialize: Serialization of this method True/false/*Example: @JSON (serialize=true) serialization of the method, or False if it is not serializedPublic String GetUserName () {return username;}*/Deserialize: Do not serialize the method True/false/*Example: @JSON (deserialize=true) does not serialize the method, and if False it is serializedPublic String GetUserName () {return username;}*/format: Sets the way in which JSON converts this method, which is typically used to convert time/*Example: @JSON (format= "YYYY-MM-DD") the value of the date corresponding to the JSON received by the client is:{Date: "2011-10-2"}Public Date getDate () {return date;}*/ v. Specific examples: Java code Action: Package org.viancent.action; Import Java.util.Date; Import Org.apache.struts2.json.annotations.JSON; Import Com.opensymphony.xwork2.ActionSupport; public class Getjsonaction extends Actionsupport { Private String username; private String password; private int age; private date date; @JSON (serialize = False) Public String GetUserName () { return username; } public void Setusername (String username) { This.username = Username; } @JSON (name= "MyPassword") Public String GetPassword () { return password; } public void SetPassword (String password) { This.password = password; } public int getage () { return age; } public void Setage (int.) { This.age = age; } @JSON (format= "YYYY-MM-DD") Public Date getDate () { return date; } public void SetDate (date date) { This.date = date; } @Override Public String Execute () throws Exception { This.setdate (New Date ()); This.setage (10); This.setpassword ("World"); This.setusername ("Hello"); return SUCCESS; } } Struts.xml Java code <struts> <package name= "struts2" extends= "Json-default" > We must inherit json-default here. <action name= "getjsons" class= "Org.viancent.action.GetJsonAction" > <result name= "Success" type= "JSON" > Be sure to define the Type property as JSON <param name= "Excludeproperties" >age</param> Exclude Getage () method </result> </action> </package> </struts> Jsp: Java code <%@ page language= "java" import= "java.util.*" pageencoding= "UTF-8"%> <! DOCTYPE HTML PUBLIC "-//w3c//dtd HTML 4.01 transitional//en" > <script type= "Text/javascript" src= "web-js/jquery-1.5.1.js" ></script>//using jquery Be sure to import JS <script type= "Text/javascript" >//Using jquery for asynchronous commits function Getjson () { $.post ( "/struts2/getjsons.action", {},function (returneddata,status) { if ("Success" ==status) { alert (returneddata); } } ) } </script> <body id= "Thebody" > <input type= "button" value= "Getjson" onclick= "Getjson ();" > </body> The results are: {"date": "2011-03-21", "MyPassword": "World"} //Use the browser's bug tool to view alert (returneddata); the only bounce is [Object,object]//Here we can see that the name of the password has been changed to MyPassword and set the Data property, the name is not changed

[Go] About Struts-json configuration (detailed JSON data support with instance struts2)