resulttag.java

java版源代码,里面包含很多源代码,大家可以看看.

package com.trulytech.mantis.tag;

import javax.servlet.jsp.tagext.*;
import java.io.IOException;
import javax.servlet.jsp.JspTagException;
import com.trulytech.mantis.result.DBResult;

/**
 * 获得DBResult的各个属性值
 * <p>Title: Mantis</p>
 *
 * <p>Description: </p>
 *
 * <p>Copyright: Copyright (c) 2002</p>
 *
 * <p>Company: </p>
 *
 * @author Wang Xian
 * @version 1.0
 */
/*例如************************************
 <bean:result name="Result" property="totalPage" />

 *******************************************/

public class ResultTag
    extends TagSupport {

  private String Name = null;
  private String Property = null;
  public void setName(String Name) {
    this.Name = Name;
  }

  public void setProperty(String Property) {
    this.Property = Property;
  }

  /**
   * 覆盖doStartTag方法
   * @return int
   * @throws JspTagException
   */
  public int doStartTag() throws JspTagException {
    return EVAL_BODY_INCLUDE;
  }

  public int doEndTag() throws JspTagException {
    try {
      if (this.pageContext.findAttribute(Name) != null)

        if (this.pageContext.findAttribute(Name) instanceof DBResult) {
          if (Property == null)
            this.pageContext.getOut().write("");
          else if (Property.equalsIgnoreCase("pageSearch"))
            this.pageContext.getOut().write( ( (DBResult)this.pageContext.
                                              findAttribute(Name)).pageSearch);
          else if (Property.equalsIgnoreCase("TotalPage"))
            this.pageContext.getOut().write( ( (DBResult)this.pageContext.
                                              findAttribute(Name)).TotalPage);
          else if (Property.equalsIgnoreCase("rowsPerPage"))
            this.pageContext.getOut().write( ( (DBResult)this.pageContext.
                                              findAttribute(Name)).rowsPerPage);
          else if (Property.equalsIgnoreCase("nextPage"))
            this.pageContext.getOut().write( ( (DBResult)this.pageContext.
                                              findAttribute(Name)).nextPage);
          else if (Property.equalsIgnoreCase("previousPage"))
            this.pageContext.getOut().write( ( (DBResult)this.pageContext.
                                              findAttribute(Name)).previousPage);
          else if (Property.equalsIgnoreCase("currentPage"))
            this.pageContext.getOut().write( ( (DBResult)this.pageContext.
                                              findAttribute(Name)).currentPage);
          else if (Property.equalsIgnoreCase("firstPage"))
            this.pageContext.getOut().write( ( (DBResult)this.pageContext.
                                              findAttribute(Name)).firstPage);
          else if (Property.equalsIgnoreCase("lastPage"))
            this.pageContext.getOut().write( ( (DBResult)this.pageContext.
                                              findAttribute(Name)).lastPage);
          else if (Property.equalsIgnoreCase("ColumnCount"))
            this.pageContext.getOut().write(String.valueOf( ( (DBResult)this.
                pageContext.
                findAttribute(Name)).ColumnCount));
          else

            this.pageContext.getOut().write("");
        }
        else
          this.pageContext.getOut().write("");
      else
        this.pageContext.getOut().write("");

    }
    catch (IOException e) {
      throw new JspTagException("Fatal error");
    }
    return EVAL_PAGE;
  }

}