我试图添加一个简单的selectManycheckbox示例,但值没有绑定到bean。我得到
INFO: WARNING: FacesMessage(s) have been enqueued, but may not have been displayed.
sourceId=form1:subscriptions[severity=(ERROR 2), summary=(Conversion Error setting value 'asis base appl' for '#{HomePage.outputType}'.), detail=(Conversion Error setting value 'asis base appl' for '#{HomePage.outputType}'.)]
这是我的jsf页面
<%@ page language="java" contentType="text/html; charset=ISO-8859-1" pageEncoding="ISO-8859-1"%>
<%@ taglib prefix="f" uri="http://java.sun.com/jsf/core"%>
<%@ taglib prefix="h" uri="http://java.sun.com/jsf/html"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<link href="css/style.css" type="text/css" rel="stylesheet">
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>Downloader</title>
</head>
<body>
<f:view>
<h:form id="form1">
<h:panelGrid border="1" columns="2"
style='color: black; font-size: 16px; font-family: "Times New Roman", Serif; font-weight: bold'>
<h:outputLabel value="Select values"></h:outputLabel>
<h:selectManyCheckbox id="subscriptions" value="#{HomePage.outputType}" layout="pageDirection">
<f:selectItem id="item1" itemLabel="ASIS" itemValue="asis"/>
<f:selectItem id="item3" itemLabel="BASE" itemValue="base"/>
<f:selectItem id="item7" itemLabel="APPLIED" itemValue="appl"/>
</h:selectManyCheckbox>
</h:panelGrid>
<h:commandButton type="submit" action="#{HomePage.genOutput}" value="Submit"></h:commandButton>
</h:form>
</f:view>
</body>
</html>
这是我的bean类主页.java:
package com.MH;
import com.MH.WebPageSaver;
public class HomePage{
private String[] outputType;
/*various getter setters*/
public String genOutput() throws Exception{
if (outputType != null)
{
System.out.println("if");
WebPageSaver w = new WebPageSaver();
try{
System.out.println("inside try");
/*independent function below works fine*/
String msg = w.generateOutput(outputType);
return msg;
}
catch (Exception e){
System.out.println(e);
return "error";
}
}
else
{
System.out.println(outputType);
System.out.println("else");
return "error";
}
}
}
导航规则指向同一页面,与消息无关。
<faces-config xmlns="http://java.sun.com/xml/ns/javaee"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-facesconfig_1_2.xsd"
version="1.2">
<managed-bean>
<managed-bean-name>HomePage</managed-bean-name>
<managed-bean-class>com.MH.HomePage</managed-bean-class>
<managed-bean-scope>session</managed-bean-scope>
</managed-bean>
<navigation-rule>
<from-view-id>/HomePage.jsp</from-view-id>
<navigation-case>
<from-outcome>success</from-outcome>
<to-view-id>/HomePage.jsp</to-view-id>
</navigation-case>
</navigation-rule>
<navigation-rule>
<from-view-id>/HomePage.jsp</from-view-id>
<navigation-case>
<from-outcome>error</from-outcome>
<to-view-id>/HomePage.jsp</to-view-id>
</navigation-case>
</navigation-rule>
</faces-config>
请让我知道我在这里缺了什么?
据我所知,我的代码中没有出现您的转换错误。我唯一能想到的是,你可能把setOutputType
方法定义错了。应该是
public void setOutputType(String[] outputType) {
this.outputType = outputType;
}
因为在提交表单时,CCD_ 2需要在您的情况下设置CCD_。
我正在努力做到彻底,所以这是我的HomePage.java
package com.MH;
public class HomePage implements java.io.Serializable {
private String[] outputType;
/*various getter setters*/
public String[] getOutputType() {
return outputType;
}
public void setOutputType(String[] outputType) {
this.outputType = outputType;
}
public String genOutput() throws Exception{
if (outputType != null)
{
System.out.println("if");
WebPageSaver w = new WebPageSaver();
try{
System.out.println("inside try");
/*independent function below works fine*/
String msg = w.generateOutput(outputType);
return msg;
}
catch (Exception e){
System.out.println(e);
return "error";
}
}
else
{
System.out.println(outputType);
System.out.println("else");
return "error";
}
}
}
和你的没什么不同。来自我端WebPageSaver
的generateOutput(String[])
只是简单地返回String
成功。我甚至做了一个简单的test.jsp,看看是否设置了值,它们是真的。(注意:太草率了)
<%@ page language="java" contentType="text/html; charset=ISO-8859-1" pageEncoding="ISO-8859-1"%>
<%@ taglib prefix="h" uri="http://java.sun.com/jsf/html"%>
<%@ taglib prefix="f" uri="http://java.sun.com/jsf/core"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<link href="css/style.css" type="text/css" rel="stylesheet">
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>Downloader</title>
</head>
<body>
<f:view>
<h:outputText value="#{HomePage.outputType[0]}"/>
<h:outputText value="#{HomePage.outputType[1]}"/>
<h:outputText value="#{HomePage.outputType[2]}"/>
</f:view>
</body>
</html>
我编辑了你的一个导航案例
<from-outcome>success</from-outcome>
<to-view-id>/test.jsp</to-view-id>
</navigation-case>
评论
不知道为什么你的genOuput
中有throws Exception
,因为你已经在方法中捕捉到了它。不需要它(除非WebPageSaver
的构造函数抛出一些东西)
此外,会话范围应该实现java.io.Serializable
。不需要,但一个良好的实践
为什么将会话范围的对象序列化是一种很好的做法?