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