Portlet开发入门实例
1原生Portlet开发
这是最简单、最本质的开发方式，直接基于Portlet规范定义的接口开发Portlet。优点是贴近底层比较灵活，
缺点当然就是所有事情都要自己去做。就好比不用SpringMVC、Struts，直接基于Servlet开发一样。
这种方式比较适合自己开发Portlet框架。
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public
class
NativePortlet
implements
Portlet {
private
Logger logger = LoggerFactory.getLogger(NativePortlet.
class
);
private
PortletConfig config;
@Override
public
void
init(PortletConfig portletConfig)
throws
PortletException {
logger.info(
"初始化Portlet"
);
this
.config = portletConfig;
}
@Override
public
void
processAction(ActionRequest actionRequest, ActionResponse actionResponse)
throws
PortletException, IOException {
logger.info(
"处理Action动作"
);
logger.info(
"接收到POST请求，用户名为[{}]"
, actionRequest.getParameter(
"userName"
));
}
@Override
public
void
render(RenderRequest renderRequest, RenderResponse renderResponse)
throws
PortletException, IOException {
logger.info(
"处理Render动作"
);
WindowState state = renderRequest.getWindowState();
if
(state.equals(WindowState.MINIMIZED)) {
return
;
}
// doDispatch();
PortletMode mode = renderRequest.getPortletMode();
if
(PortletMode.VIEW.equals(mode)) {
// doView();
String normalPage = config.getInitParameter(
"ViewPage"
);
if
(WindowState.NORMAL.equals(state)) {
this
.include(renderRequest, renderResponse, normalPage);
}
else
{
this
.include(renderRequest, renderResponse,
""
);
}
}
else
if
(PortletMode.EDIT.equals(mode)) {
// doEdit();
}
else
if
(PortletMode.HELP.equals(mode)) {
// doHelp();
}
else
{
throw
new
PortletException(
"unknown portlet mode: "
+ mode);
}
}
@Override
public
void
destroy() {
logger.info(
"销毁Portlet"
);
}
private
void
include(RenderRequest request, RenderResponse response, String viewPage)
throws
PortletException, IOException {
response.setContentType(
"text/html"
);
PortletContext context = config.getPortletContext();
PortletRequestDispatcher requestDispatcher = context.getRequestDispatcher(viewPage);
requestDispatcher.include(request, response);
}
}
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可以看到，在render()方法中，我们要自己处理不同Portlet模式(View,Edit,Help等)的渲染，根据需要做分发。
诸如此类的各种细节都需要我们自己去制定规则，自己处理。
2注解Portlet开发
Portlet规范也提供了注解的方式来开发Portlet。这样不用依赖SpringMVC Portlet等第三方框架，
也能比较方便的开发Portlet，又不用处理特别底层的实现细节。来看一个例子。
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public
class
AnnotatedPortlet
extends
GenericPortlet {
private
Logger logger = LoggerFactory.getLogger(AnnotatedPortlet.
class
);
/**
* 进入主页面(View模式)
* @param request
* @param response
* @throws Exception
*/
@RenderMode
(name =
"view"
)
public
void
toIndexPage(RenderRequest request, RenderResponse response)
throws
Exception {
getPortletContext().
getRequestDispatcher(getInitParameter(
"ViewPage"
)).
include(request, response);
}
/**
* 保存用户名
* @param request
* @param response
*/
@ProcessAction
(name =
"saveUsername"
)
public
void
saveUsername(ActionRequest request, ActionResponse response) {
String userName = request.getParameter(
"userName"
);
logger.info(
"保存用户名[{}]"
, userName);
}
/**
* 保存电子邮件地址
* @param request
* @param response
*/
@ProcessAction
(name =
"saveEmail"
)
public
void
saveEmail(ActionRequest request, ActionResponse response) {
String email = request.getParameter(
"email"
);
logger.info(
"保存Email[{}]"
, email);
}
}
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使用@RenderMode注解定义不同模式下，Portlet渲染的实现方法。@ProcessAction注解可以根据动作名称，
直接将请求交给标有注解的方法去处理，不用我们自己去实现根据注解分发请求的代码了。
附：其他代码
页面代码如下。使用Portlet规范中定义的标签产生ActionUrl。
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<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<%@ taglib uri="http://java.sun.com/jstl/core_rt" prefix="c"%>
<%@ taglib uri="http://java.sun.com/jstl/fmt" prefix="fmt"%>
<%@ taglib uri="http://java.sun.com/jsp/jstl/functions" prefix="fn"%>
<%@ taglib uri="http://java.sun.com/portlet_2_0" prefix="portlet"%>
<
portlet:defineObjects
/>
<
h3
>这是一个演示FORM表单和AJAX提交的示例程序</
h3
>
<!-- FORM表单提交实例 -->
<
form
action='<portlet:actionURL
name
=
"saveUsername"
/>' method="POST">
<
tr
>
<
td
>用户名：</
td
>
<
td
><
input
name
=
"userName"
type
=
"text"
/></
td
>
</
tr
>
<
tr
>
<
td
><
input
type
=
"submit"
value
=
"表单提交"
/></
td
>
</
tr
>
</
form
>
<!-- AJAX提交实例 -->
<
tr
>
<
td
>Email：</
td
>
<
td
><
input
id
=
"email"
type
=
"text"
/></
td
>
</
tr
>
<
tr
>
<
input
id
=
"ajaxBtn"
type
=
"button"
value
=
"AJAX提交"
/>
</
tr
>
<
script
>
$(".ajaxBtn").bind("click", function () {
var email = $(".email").valueOf();
jQuery.ajax({
type: "GET",
async: true,
url: '<
portlet:actionURL
name
=
"saveEmail"
/>',
dataType: 'json',
data: {
"email": email
},
success: function (data) {
alert(data);
},
error: function (data, status, e) {
alert(e);
},
beforeSend: function () {
},
complete: function () {
}
});
});
</
script
>
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