jsf实现翻页

用jsf实现了翻页功能，主要原理是扩展datamodel和datatabletag
1 扩展datatabletag，增加了几个属性，用于后台执行查询语句

java 代码

package com.longtop.core.web.jsf.tag;

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

import com.sun.faces.taglib.html_basic.DataTableTag;

public class DataTableWithScrollTag extends DataTableTag {
    private boolean scroll = true;

    private int pageSize = 10;

    private String scrollPageCss = "";
    private String moduleId;
    private String statementId;
    private String beanName;
    private String implType;
    private String searchCondition;

    /**
     * @return the pageSize
     */
    public int getPageSize() {
        return pageSize;
    }

    /**
     * @param pageSize
     *            the pageSize to set
     */
    public void setPageSize(int pageSize) {
        this.pageSize = pageSize;
    }

    /**
     * @return the scroll
     */
    public boolean isScroll() {
        return scroll;
    }

    /**
     * @param scroll
     *            the scroll to set
     */
    public void setScroll(boolean scroll) {
        this.scroll = scroll;
    }

    public String getComponentType() {

        return "com.longtop.core.web.jsf.render.DataTableWithScrollType";
    }


    public void setProperties(UIComponent component) {
        super.setProperties(component);
        setStringProperty(component, "pageSize", String.valueOf(pageSize));
        setStringProperty(component, "scroll", String.valueOf(scroll));
        setStringProperty(component, "scrollPageCss", scrollPageCss);
        setStringProperty(component, "moduleId", moduleId);
        setStringProperty(component, "statementId", statementId);
        setStringProperty(component, "beanName", beanName);
        setStringProperty(component, "implType", implType);
        setStringProperty(component, "searchCondition", searchCondition);
    }

    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);
        }
    }

    /**
     * @return the scrollPageCss
     */
    public String getScrollPageCss() {
        return scrollPageCss;
    }

    /**
     * @param scrollPageCss the scrollPageCss to set
     */
    public void setScrollPageCss(String scrollPageCss) {
        this.scrollPageCss = scrollPageCss;
    }

    /**
     * @return the moduleId
     */
    public String getModuleId() {
        return moduleId;
    }

    /**
     * @param moduleId the moduleId to set
     */
    public void setModuleId(String moduleId) {
        this.moduleId = moduleId;
    }

    /**
     * @return the statementId
     */
    public String getStatementId() {
        return statementId;
    }

    /**
     * @param statementId the statementId to set
     */
    public void setStatementId(String statementId) {
        this.statementId = statementId;
    }

    /**
     * @return the beanName
     */
    public String getBeanName() {
        return beanName;
    }

    /**
     * @param beanName the beanName to set
     */
    public void setBeanName(String beanName) {
        this.beanName = beanName;
    }

    /**
     * @return the implType
     */
    public String getImplType() {
        return implType;
    }

    /**
     * @param implType the implType to set
     */
    public void setImplType(String implType) {
        this.implType = implType;
    }

    /**
     * @return the searchCondition
     */
    public String getSearchCondition() {
        return searchCondition;
    }

    /**
     * @param searchCondition the searchCondition to set
     */
    public void setSearchCondition(String searchCondition) {
        this.searchCondition = searchCondition;
    }

}

2 dragon.tld

xml 代码

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE taglib
PUBLIC "-//Sun Microsystems, Inc.//DTD JSP Tag Library 1.2//EN"
"http://java.sun.com/dtd/web-jsptaglibrary_1_2.dtd">
<taglib>
    <tlib-version>1.0</tlib-version>
    <jsp-version>2.0</jsp-version>
    <short-name>d</short-name>
    <uri>http://com.longtop.net/dataTableWithScroll</uri>
    <tag>
        <name>scrollDataTable</name>
        <tag-class>com.longtop.core.web.jsf.tag.DataTableWithScrollTag</tag-class>
        <tei-class>com.sun.faces.taglib.FacesTagExtraInfo</tei-class>
    <body-content>JSP</body-content>
    <description>

    </description>
    <attribute>
      <name>first</name>
      <required>false</required>
      <rtexprvalue>false</rtexprvalue>
      <description>

          Zero-relative row number of the first row to be displayed.  If this
          property is set to zero, rendering will begin with the first row of
          the underlying data.
      </description>
    </attribute>
    <attribute>
      <name>id</name>
      <required>false</required>
      <rtexprvalue>false</rtexprvalue>
      <description>

          The component identifier for this component.  This value must be
          unique within the closest parent component that is a naming
          container.
      </description>
    </attribute>
    <attribute>
      <name>rendered</name>
      <required>false</required>
      <rtexprvalue>false</rtexprvalue>
      <description>

          Flag indicating whether or not this component should be rendered
          (during Render Response Phase), or processed on any subsequent
          form submit.
      </description>
    </attribute>
    <attribute>
      <name>rows</name>
      <required>false</required>
      <rtexprvalue>false</rtexprvalue>
      <description>

          The number of rows to display, starting with the one identified by the
          "first" property.  If this value is set to zero, all available rows in
          the underlying data model will be displayed.
      </description>
    </attribute>
    <attribute>
      <name>value</name>
      <required>false</required>
      <rtexprvalue>false</rtexprvalue>
      <description>

          The current value of this component.
      </description>
    </attribute>
    <attribute>
      <name>var</name>
      <required>false</required>
      <rtexprvalue>false</rtexprvalue>
      <description>

          Name of a request-scope attribute under which the model data for the
          row selected by the current value of the "rowIndex" property (i.e.
          also the current value of the "rowData" property) will be exposed.
      </description>
    </attribute>
    <attribute>
      <name>bgcolor</name>
      <required>false</required>
      <rtexprvalue>false</rtexprvalue>
      <description>

          Name or code of the background color for this table.
      </description>
    </attribute>
    <attribute>
      <name>border</name>
      <required>false</required>
      <rtexprvalue>false</rtexprvalue>
      <description>

          Width (in pixels) of the border to be drawn
          around this table.
      </description>
    </attribute>
    <attribute>
      <name>cellpadding</name>
      <required>false</required>
      <rtexprvalue>false</rtexprvalue>
      <description>

          Definition of how much space the user agent should
          leave between the border of each cell and its contents.
      </description>
    </attribute>
    <attribute>
      <name>cellspacing</name>
      <required>false</required>
      <rtexprvalue>false</rtexprvalue>
      <description>

          Definition of how much space the user agent should
          leave between the left side of the table and the
          leftmost column, the top of the table and the top of
          the top side of the topmost row, and so on for the
          right and bottom of the table.  It also specifies
          the amount of space to leave between cells.
      </description>
    </attribute>
    <attribute>
      <name>columnClasses</name>
      <required>false</required>
      <rtexprvalue>false</rtexprvalue>
      <description>

          Comma-delimited list of CSS style classes that will be applied
          to the columns of this table.  A space separated list of
          classes may also be specified for any individual column.  If
          the number of elements in this list is less than the number of
          columns specified in the "columns" attribute, no "class"
          attribute is output for each column greater than the number of
          elements in the list.  If the number of elements in the list
          is greater than the number of columns specified in the
          "columns" attribute, the elements at the posisiton in the list
          after the value of the "columns" attribute are ignored.
      </description>
    </attribute>
    <attribute>
      <name>dir</name>
      <required>false</required>
      <rtexprvalue>false</rtexprvalue>
      <description>

          Direction indication for text that does not inherit directionality.
          Valid values are "LTR" (left-to-right) and "RTL" (right-to-left).
      </description>
    </attribute>
    <attribute>
      <name>footerClass</name>
      <required>false</required>
      <rtexprvalue>false</rtexprvalue>
      <description>

          Space-separated list of CSS style class(es) that will be
          applied to any footer generated for this table.
      </description>
    </attribute>
    <attribute>
      <name>frame</name>
      <required>false</required>
      <rtexprvalue>false</rtexprvalue>
      <description>

          Code specifying which sides of the frame surrounding
          this table will be visible.  Valid values are:
          none (no sides, default value); above (top side only);
          below (bottom side only); hsides (top and bottom sides
          only); vsides (right and left sides only); lhs (left
          hand side only); rhs (right hand side only); box
          (all four sides); and border (all four sides).
      </description>
    </attribute>
    <attribute>
      <name>headerClass</name>
      <required>false</required>
      <rtexprvalue>false</rtexprvalue>
      <description>

          Space-separated list of CSS style class(es) that will be
          applied to any header generated for this table.
      </description>
    </attribute>
    <attribute>
      <name>lang</name>
      <required>false</required>
      <rtexprvalue>false</