Extended struts2 result set Strutsresultsupport custom result processing JSON

Previously in the use of STRUTS2 development projects, the processing of JSON has been in action, in action directly response, recently studied Struts2 source, found a more elegant solution, define a Resulttype ,

First, we first look at the source code in the Struts2

Defaultactioninvocation under the package COM.OPENSYMPHONY.XWORK2

472 rows

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2. /**
4. * Save The result to be used later.
6. * @param actionconfig Current Actionconfig
8. * @param methodresult The result of the action.
10. * @return The result code to process.
12. */
14. Protected String Saveresult (actionconfig actionconfig, Object methodresult) {
16. if (methodresult instanceof Result) {
18. This.explicitresult = (Result) Methodresult;
22. //Wire The result automatically
24. Container.inject (Explicitresult);
26. return null;
28. } Else {
30. return (String) Methodresult;
32. }
34. }

If the Resulttype implements the result interface, it executes the

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1. This.explicitresult = (Result) Methodresult;
3. //Wire The result automatically
4. Container.inject (Explicitresult);
5. return null;

Now let's define an interface (Jsonresult) to handle the generic Pojo object

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2. Package com.kiloway.struts;
6. Import Java.io.PrintWriter;
10. Import Javax.servlet.http.HttpServletResponse;
14. Import Net.sf.json.JSONObject;
16. Import Net.sf.json.JsonConfig;
20. Import Org.apache.struts2.ServletActionContext;
22. Import Org.apache.struts2.dispatcher.StrutsResultSupport;
26. Import com.opensymphony.xwork2.ActionInvocation;
30. Public class Jsonresult extends Strutsresultsupport {
34. private Object result;
36. private Jsonconfig Jsonconfig;
40. Public Object GetResult () {
42. return result;
44. }
48. Public Jsonresult (Jsonconfig jsonconfig) {
50. super ();
52. this.jsonconfig = jsonconfig;
54. }
58. public void Setresult (Object result) {
60. This.result = result;
62. }
66. private Static final long serialversionuid = 7978145882434289002L;
70. @Override
72. protected void Doexecute (String finallocation, actioninvocation invocation)
74. throws Exception {
76. HttpServletResponse response = null;
78. try {
80. Response = Servletactioncontext.getresponse ();
82. PrintWriter printwriter = Response.getwriter ();
84. if (jsonconfig! = null) {
86. Printwriter.write (Jsonobject.fromobject (Result). ToString ());
88. } Else {
90. Printwriter.write (Jsonobject.fromobject (result, Jsonconfig)
92. . toString ());
94. }
96. }catch (Exception e) {
98. throw New Exception ("JSON parse error!");
100. } finally {
102. Response.getwriter (). Close ();
104. }
112. }
114. }

Jsonreulst defines how to get struts to handle it?

We can define this in Struts.xml.

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2. <package name="Default" namespace="/" extends="Struts-default">
4. <result-types>
6. <result-type name="Jsonresult" class="Com.kiloway.struts.JsonResult"/>
8. </result-types>
12. <action name="student" class="com.kiloway.struts.Student">
14. <result name="JSON" type="Jsonresult"/>
16. </Action>
18. </Package>

The name of the REUSLT can be arbitrary, but the type must be the same as the resulttype you register.

This is called directly in the Action

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2. Public Jsonresult Getjson ()
4. {
6. UserInfo f = new UserInfo ();
8. F.setname ("small core");
10. F.setpassword ("haha");
12. Jsonresult Jsonresult = new Jsonresult ();
14. Jsonresult.setresult (f);
16. return jsonresult;
18. }

In our action code we do not have to Response.Write, completely to the Reuslt object to deal with (Doexecute)

This makes it easy to work with JSON-formatted data

In the latest Struts development package I downloaded, a JSON processing plugin was found Struts2-json-plugin-2.3.8.jar

The plugin provides a more complete JSON processing solution, and the next article describes how the plugin is used

Source: http://blog.csdn.net/myxx520/article/details/8655088

Extended struts2 result set Strutsresultsupport custom result processing JSON