<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" 
    "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml"   
      xmlns:h="http://java.sun.com/jsf/html"
      xmlns:f="http://java.sun.com/jsf/core">
    <h:body>
        <h:form>
            <h:panelGrid columns="3">
                Enter your bookmark URL :
                <h:inputText id="bookmarkURL" value="#{user.bookmarkURL}" 
                             size="40" required="true" label="Bookmark URL">
                    <f:converter converterId="com.yiibai.URLConverter" />
                </h:inputText>

                <h:message for="bookmarkURL" style="color:red" />

            </h:panelGrid>

            <h:commandButton value="Submit" action="result" />

        </h:form>

    </h:body>
</html>

文件：result.xhtml 的代碼內(nèi)容如下所示 -

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" 
    "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml"   
      xmlns:h="http://java.sun.com/jsf/html"
      xmlns:f="http://java.sun.com/jsf/core"
      xmlns:c="http://java.sun.com/jsp/jstl/core"
      >
    <h:body>
        <h:panelGrid columns="2">

            Bookmark URL :  
            <h:outputText value="#{user.bookmarkURL}" />

        </h:panelGrid>

    </h:body>
</html>

文件：User.java 的代碼內(nèi)容如下所示 -

/*
 * To change this license header, choose License Headers in Project Properties.
 * To change this template file, choose Tools | Templates
 * and open the template in the editor.
 */
package com.yiibai;

/**
 *
 * @author Administrator
 */
import javax.faces.application.FacesMessage;
import javax.faces.component.UIComponent;
import javax.faces.context.FacesContext;
import javax.faces.convert.Converter;
import javax.faces.convert.ConverterException;
import javax.faces.convert.FacesConverter;

@FacesConverter("com.yiibai.URLConverter")
public class URLConverter implements Converter {

    @Override
    public Object getAsObject(FacesContext context, UIComponent component,
            String value) {

        String HTTP = "http://";
        StringBuilder url = new StringBuilder();

        if (!value.startsWith(HTTP, 0)) {
            url.append(HTTP);
        }
        url.append(value);

        if (url.toString().length() > 30) {
            FacesMessage msg
                    = new FacesMessage("URL Conversion error.",
                            "Invalid URL format.");
            msg.setSeverity(FacesMessage.SEVERITY_ERROR);
            throw new ConverterException(msg);
        }
        return url.toString();
    }

    @Override
    public String getAsString(FacesContext context, UIComponent component,
            Object value) {

        return value.toString();
    }
}

右鍵運行工程：CustomConverter，如果沒有任何錯誤，打開瀏覽器訪問：

http://localhost:8084/CustomConverter/

應(yīng)該會看到以下結(jié)果 -

簡單寫入一些信息，然后提交 -

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