paramtag.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.TagSupport;
import java.io.IOException;
import javax.servlet.jsp.JspTagException;
import com.trulytech.mantis.result.DBResult;


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

   <bean:param name="Result" property="msg" />

 ***********************************************/
/**
 * <p>Title: Mantis</p>
 *
 * <p>Description: 获得DBResult查询参数的值</p>
 *
 * <p>Copyright: Copyright (c) 2002</p>
 *
 * <p>Company: </p>
 *
 * @author Wang Xian
 * @version 1.0
 */
public class ParamTag
    extends TagSupport {

  private String Name = null;
  private String Property = null;
  /**
   * 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 ( ( (DBResult)this.pageContext.findAttribute(Name)).ParamList.get(
              Property) == null)
            this.pageContext.getOut().write("");
          else
            this.pageContext.getOut().write( (String) ( (DBResult)this.
                pageContext.findAttribute(Name)).ParamList.get(Property));
        }
        else
          this.pageContext.getOut().write("");
      else
        this.pageContext.getOut().write("");

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

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

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

}