1
22
23 package com.liferay.portal.struts;
24
25 import com.liferay.portal.kernel.servlet.HttpHeaders;
26 import com.liferay.portal.kernel.util.ContentTypes;
27 import com.liferay.portal.kernel.util.ParamUtil;
28 import com.liferay.portal.kernel.util.Validator;
29 import com.liferay.portal.util.PortalUtil;
30
31 import java.io.PrintWriter;
32
33 import javax.servlet.http.HttpServletRequest;
34 import javax.servlet.http.HttpServletResponse;
35
36 import org.apache.struts.action.Action;
37 import org.apache.struts.action.ActionForm;
38 import org.apache.struts.action.ActionForward;
39 import org.apache.struts.action.ActionMapping;
40
41
47 public abstract class JSONAction extends Action {
48
49 public ActionForward execute(
50 ActionMapping mapping, ActionForm form, HttpServletRequest req,
51 HttpServletResponse res)
52 throws Exception {
53
54 String callback = ParamUtil.getString(req, "callback");
55 String instance = ParamUtil.getString(req, "inst");
56
57 String json = null;
58
59 try {
60 json = getJSON(mapping, form, req, res);
61
62 if (Validator.isNotNull(callback)) {
63 json = callback + "(" + json + ");";
64 }
65 else if (Validator.isNotNull(instance)) {
66 json = "var " + instance + "=" + json + ";";
67 }
68 }
69 catch (Exception e) {
70 PortalUtil.sendError(
71 HttpServletResponse.SC_INTERNAL_SERVER_ERROR, e, req, res);
72
73 return null;
74 }
75
76 if (Validator.isNotNull(json)) {
77 res.setContentType(ContentTypes.TEXT_JAVASCRIPT);
78 res.setHeader(HttpHeaders.CACHE_CONTROL, "no-cache");
79
80 PrintWriter pw = res.getWriter();
81
82 pw.write(json);
83
84 pw.close();
85 }
86
87 return null;
88 }
89
90 public abstract String getJSON(
91 ActionMapping mapping, ActionForm form, HttpServletRequest req,
92 HttpServletResponse res)
93 throws Exception;
94
95 }