STRUTS2 Integration JSON

STRUTS2 integrates JSON, requires some jar packages

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Here are the 3 methods to integrate JSON

Method One

Output JSON data in a view resource

After the action finishes processing the user request, stores the data in a location, such as request, and returns the view, and struts jumps to the view resource, where we need to take the data out of the storage location and convert it to a JSON string, output in the view.

1     /**2 * Test returns JSON data in view by Action3      */4      PublicString testbyjsp () {5User User =NewUser ();6User.setid ("1");7User.setname ("jsonactionjsp Chinese will be garbled?"));8User.setpassword ("123");9Jsonobject Jsonobject =NewJsonobject ();TenJsonobject.accumulate ("User", user); OneJsonobject.accumulate ("Success",true); A         //here a data is placed in the request object, so the result configuration of struts cannot have type= "redirect" Servletactioncontext.getrequest (). SetAttribute (" Data ", jsonobject.tostring ()); -         returnSUCCESS; -};

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Configuration of the Struts.xml

1 < Packagename= "Default"extends= "Struts-default"namespace="/">        2         <Actionname= "testbyjsp"3 class= "Com.scitc.test.web.UserAction" 4 Method= "testbyjsp">5             <resultname= "Success">/actionjsp.jsp</result>6         </Action>7     </ Package>

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Method Two

Output JSON data in an action in a Struts2 manner

1 //objects that will be serialized as JSON strings by Struts22     PrivateMap<string, object>DataMap;3      Publicuseraction () {4DataMap =NewHashmap<string, object>();5     }6     /**7 * STRUTS2 When serializing a specified property, there must be a getter method for that property, in fact, if there is no attribute, and only the Getter method is possible8      */9      PublicMap<string, object>Getdatamap () {Ten         returnDataMap; One     }     A     /** - * Test returns JSON data by action in Struts2 default mode -      */ the      PublicString testbyaction () { -         //the data in the Datamap will be converted to a JSON string by STRUTS2, so the data in it should be emptied first. - datamap.clear (); -User User =NewUser (); +User.setid ("2"); -User.setname ("JSONActionStruts2 Chinese will be garbled?")); +User.setpassword ("123"); A         //put in a sign of whether the operation was successful atDatamap.put ("Success",true); -Datamap.put ("User", user); -         returnSUCCESS; -}

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Struts.xml Configuration

1  < Packagename= "JSON"extends= "Json-default"namespace="/">2         <Actionname= "Testbyaction"3 class= "Com.scitc.test.web.UserAction" 4 Method= "Testbyaction">5             <resulttype= "JSON">6                 <paramname= "root">DataMap</param>7                 <!--Note ie prompts you to download the requested connection resource without the following configuration -8                 <paramname= "ContentType">Text/html</param>9             </result>Ten         </Action> One     </ Package>

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Method Three

To output JSON data in action in the traditional way

This is basically the same as the traditional servlet approach, the code is as follows

1 /**2 * The traditional way to return JSON data via action3      */4      Public voidDoAction ()throwsIOException {5HttpServletResponse resp =servletactioncontext.getresponse ();6Resp.setcontenttype ("text/html");7OutputStream out =Resp.getoutputstream ();8         //the object that will be returned to the client9User User =NewUser ();TenUser.setid ("3"); OneUser.setname ("Jsonactiongeneral Chinese will be garbled?")); AUser.setpassword ("123"); -Jsonobject JSON =NewJsonobject (); -Json.accumulate ("User", user); theJson.accumulate ("Success",true); - Out.write (Json.tostring (). GetBytes ()); - out.close (); -}

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Struts.xml Configuration

1     < Packagename= "Default"extends= "Struts-default"namespace="/">2         <Actionname= "Testjsonfromactionbygeneral"3 class= "Com.scitc.test.web.UserAction" 4 Method= "DoAction">5                 <!--because it is a traditional request, there is no <result/> result page corresponding to it, that is, only the <action> request -6         </Action>7     </ Package>

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Of these three methods, only method two <package> to inherit "Json-default"

The effects of the three methods are:

STRUTS2 Integration JSON