oracle ADF：通过 JSP 中的托管 bean 调用方法
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ADF: Calling a method through a managed beans in JSP
提问by jds2501
I am running into issues with passing parameters to managed beans in JSP within Oracle ADF. Here is an example JSP test page I am trying to pass parameters to a test method in a POJO:
我在将参数传递给 Oracle ADF 中 JSP 中的托管 bean 时遇到了问题。这是一个示例 JSP 测试页面，我试图将参数传递给 POJO 中的测试方法：
<?xml version='1.0' encoding='windows-1252'?>
<jsp:root xmlns:jsp="http://java.sun.com/JSP/Page" version="2.1"
xmlns:f="http://java.sun.com/jsf/core"
xmlns:h="http://java.sun.com/jsf/html"
xmlns:af="http://xmlns.oracle.com/adf/faces/rich">
<jsp:directive.page contentType="text/html;charset=windows-1252"/>
<f:view>
<af:document title="Automated Scheduling Tool > Customer Portal > Packages"
id="d1">
<af:messages id="m1"/>
<af:form id="f1">
<center>
<br/><br/><br/>
<table cellspacing="0" cellpadding="45" width="800">
<tr>
<td width="100%" class="darkBackground">
<span class="largeTitle">AUTOMATED SCHEDULING TOOL</span>
<br/>
<span class="mediumTitle">CUSTOMER PORTAL</span>
</td>
</tr>
<tr>
<af:outputText value="#{pageFlowScope.customerFacadeBean.test['test1', 'test2']}" id="ot1" />
</tr>
</table>
</center>
</af:form>
</af:document>
</f:view>
</jsp:root>
public class CustomerFacade {
private final PackageMapper mapper;
private List<Package> packages;
public CustomerFacade() {
mapper = new PackageMapper();
packages = mapper.findAllPackages();
}
public List<Package> getPackages() {
return packages;
}
public String test(String testString1, String testString2){
System.out.println(testString1 + testString2);
return "Success!";
}
}
Does anyone have any suggestions for how I can pass parameters to the POJO via a managed bean?
有没有人对我如何通过托管 bean 将参数传递给 POJO 有任何建议？
回答by McDowell
#{pageFlowScope.customerFacadeBean.test['test1', 'test2']}
This is not a legal Unified Expression Language expression. You could probably do something like this:
这不是合法的统一表达式语言表达式。你可能会做这样的事情：
#{pageFlowScope.customerFacadeBean.test['test1']['test2']}
...where testresolved to a map of maps:
...test解析为地图的地图：
public Map<Object, Map<Object, Object>> getTest() {
return new HashMap<Object, Map<Object, Object>>() {
@Override
public Map<Object, Object> get(final Object test1) {
return new HashMap<Object, Object>() {
@Override
public Object get(Object test2) {
return getSomething(test1, test2);
}
};
}
};
}
private Object getSomething(Object test1, Object test2) {
//TODO
}
Obviously, this is really ugly.
显然，这真的很丑陋。
You could try implementing a custom functionin the form #{stuff:callTest(pageFlowScope.customerFacadeBean, 'test1', 'test2')}.
您可以尝试在表单中实现自定义函数#{stuff:callTest(pageFlowScope.customerFacadeBean, 'test1', 'test2')}。
Servers implementing JSP 2.1 Maintenance Release 2should support expressions of the form #{mybean.something(param)}(read this for more info). Some frameworks may already support this syntax - it's worth checking the doc.
实现JSP 2.1 维护版本 2 的服务器应该支持表单的表达式#{mybean.something(param)}（阅读这里了解更多信息）。一些框架可能已经支持这种语法 - 值得查看文档。
回答by BestPractices
There is a somewhat elegant alternative solution similar to the above: http://wiki.apache.org/myfaces/Parameters_In_EL_Functions
有一个类似于上述的优雅的替代解决方案：http: //wiki.apache.org/myfaces/Parameters_In_EL_Functions
