jsf自定义组件-jafyear选择年份

 

就是一个下拉框，可以配置选取的范围，用today表示当期年份，输入简单表达式。 

 

package com.cfcc.jaf.webx.component.jafdate.jafyear;

import javax.faces.component.UIComponentBase;
import javax.faces.context.FacesContext;

/** *//**
 * 年份选择框组件
 * @author qinjinwei
 * $date 2007-9-12 上午09:52:28
 */
public class JafYear extends UIComponentBase ...{
    
    public final String JAF_DATE_FAMILY = "jaf.jafdate";

    public String getFamily() ...{
        return JAF_DATE_FAMILY;
    }
    
    public Object saveState(FacesContext context) ...{
        Object values[] = new Object[1];
        values[0] = super.saveState(context);
        return values;
    }

    public void restoreState(FacesContext context, Object state) ...{
        Object values[] = (Object[]) state;
        super.restoreState(context, values[0]);

    }

}

 

package com.cfcc.jaf.webx.component.jafdate.jafyear;

import java.io.IOException;
import java.util.Date;
import java.util.Map;

import javax.faces.component.UIComponent;
import javax.faces.context.FacesContext;
import javax.faces.context.ResponseWriter;
import javax.faces.el.ValueBinding;

import org.apache.myfaces.shared_tomahawk.renderkit.html.HtmlRenderer;

/** *//**
 * 年份选择框组件renderer
 * @author qinjinwei
 * $date 2007-9-12 上午09:52:30
 */
public class JafYearRenderer extends HtmlRenderer ...{

    public void encodeEnd(FacesContext facesContext, UIComponent component)
            throws IOException ...{
        
        String sfrom = (String) component.getAttributes().get("from");
        String sto = (String) component.getAttributes().get("to");
        int ifrom = convert(sfrom) + 1900;
        int ito = convert(sto) + 1900;
        ResponseWriter writer = facesContext.getResponseWriter();
        String clientId = component.getClientId(facesContext);
        
        
        ValueBinding vb = component.getValueBinding("value");
        String syear = (String) vb.getValue(facesContext);
        if(syear == null)
        ...{
            syear = "" + (new Date().getYear() + 1900 );
        }
        
        int year = Integer.parseInt(syear);

        writer.write("" + clientId + "" name="" + clientId + ""> ");
        for (int i = ifrom; i <= ito; i++) ...{
            writer.write("" + i + """);
            if(year == i)
            ...{
                writer.write(" selected ");
            }
            writer.write(">" + i );
            writer.write("年 ");
        }
        writer.write("");
    }
    
    public void decode(FacesContext facesContext, UIComponent uiComponent)
    ...{
        Map paramMap = facesContext.getExternalContext()
        .getRequestParameterMap();
        String clientId = uiComponent.getClientId(facesContext);
        if(paramMap.containsKey(clientId))
        ...{
            String value = (String) paramMap
                    .get(clientId);
            
            ValueBinding vb = uiComponent.getValueBinding("value");
            vb.setValue(facesContext, value);
            System.out.println(clientId + " value is: " + value);
        }
    }

    private int convert(String exp) ...{

        boolean bflagt = false;
        boolean bflags = false;

        String ex = exp.replaceAll(" ", "");
        if (ex.startsWith("today")) ...{
            bflagt = true;
            ex = ex.replaceAll("today", "");
        }
        
        if (ex.startsWith("+")) ...{
            bflags = true;
        }
        
        ex = ex.substring(1, ex.length());

        int rvalue = Integer.parseInt(ex);
        if(!bflags)
        ...{
            rvalue = - rvalue;
        }

        if (bflagt)
            rvalue = rvalue + new Date().getYear();

        return rvalue;
    }
}

 

package com.cfcc.jaf.webx.component.jafdate.jafyear;

import javax.faces.application.Application;
import javax.faces.component.UIComponent;
import javax.faces.context.FacesContext;
import javax.faces.el.ValueBinding;
import javax.faces.webapp.UIComponentTag;

/** *//**
 * 年份选择框组件的标签
 * @author qinjinwei
 * $date 2007-9-12 上午09:52:36
 */
public class JafYearTag extends UIComponentTag
...{
    
    public String getComponentType()
    ...{
        return "com.cfcc.jaf.webx.component.jafdate.jafyear.JafYear";
    }

    public String getRendererType()
    ...{
        return "com.cfcc.jaf.webx.component.jafdate.jafyear.JafYearRenderer";
    }
    
    private String from;
    private String to;
    private String value;
    
    public String getValue() ...{
        return value;
    }

    public void setValue(String value) ...{
        this.value = value;
    }

    public String getFrom() ...{
        return from;
    }

    public void setFrom(String from) ...{
        this.from = from;
    }

    public String getTo() ...{
        return to;
    }

    public void setTo(String to) ...{
        this.to = to;
    }
    
    public void setProperties(UIComponent component) ...{
        super.setProperties(component);
        setStringProperty(component, "from", from);
        setStringProperty(component, "to", to);
        setStringProperty(component, "value", value);
    }

    private void setStringProperty(UIComponent component, String attrName,
            String attrValue) ...{
        if (attrValue == null)
            return;
        if (isValueReference(attrValue)) ...{
            FacesContext context = FacesContext.getCurrentInstance();
            Application application = context.getApplication();
            ValueBinding binding = application.createValueBinding(attrValue);
            component.setValueBinding(attrName, binding);
        } else ...{
            component.getAttributes().put(attrName, attrValue);
        }
    }

    public void release() ...{
        super.release();
        from = null;
        to  = null;
        value = null;
    }
    
    
}

 

 

<tag>
        <name>jafyear</name>
        <tag-class>
            com.cfcc.jaf.webx.component.jafdate.jafyear.JafYearTag
        </tag-class>
        <body-content>empty</body-content>
        <attribute>
            <name>from</name>
            <required>true</required>
        </attribute>
        <attribute>
            <name>to</name>
            <required>true</required>
        </attribute>
        <attribute>
            <name>value</name>
            <required>true</required>
        </attribute>
    </tag>

 

<renderer>
            <component-family>jaf.jafdate</component-family>
            <renderer-type>com.cfcc.jaf.webx.component.jafdate.jafyear.JafYearRenderer</renderer-type>
            <renderer-class>com.cfcc.jaf.webx.component.jafdate.jafyear.JafYearRenderer</renderer-class>
        </renderer>

    <component>
        <component-type>
            com.cfcc.jaf.webx.component.jafdate.jafyear.JafYear
        </component-type>
        <component-class>
            com.cfcc.jaf.webx.component.jafdate.jafyear.JafYear
        </component-class>
    </component>