columnnotequaltag.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.BodyTagSupport;
import com.trulytech.mantis.result.DBColumn;
import java.io.IOException;
import javax.servlet.jsp.JspTagException;
import java.util.ArrayList;

/**
 *
 * <p>Title: Mantis</p>
 *
 * <p>Description: 根据指定的列值判断DBColumn中的值是否不等于指定的值</p>
 *
 * <p>Copyright: Copyright (c) 2002</p>
 *
 * <p>Company: </p>
 *
 * @author Wang Xian
 * @version 1.1
 */

/*例如********************************************************

 <bean:foreach name="Result">
   <tr>
 <td width="100%"><bean:valuenotequal col="0" key="22" >...</bean:valuenotequal></td>
   </tr>
 </bean:foreach>

 */
public class ColumnNotEqualTag
    extends BodyTagSupport {
  //行号
  private int Col = 0;

//是否等于标志
  private boolean flag = false;

//等于的字符
  private String Key = null;

  public void setCol(int Col) {
    this.Col = Col;
  }

  public void setKey(String Key) {
    this.Key = Key;
  }

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

    String tmpStr = null;
    if (this.pageContext.findAttribute("array") != null) {
      if (this.pageContext.findAttribute("array") instanceof ArrayList)
        if (Col >=
            ( (ArrayList)this.pageContext.findAttribute("array")).size())
          tmpStr = "";
        else
          tmpStr = ( (DBColumn) ( (ArrayList)this.
                                 pageContext.findAttribute("array")).get(Col)).
              Value;

      else
        tmpStr = "";

    }

    if (tmpStr == null || Key == null) {
      flag = false;
      return SKIP_BODY;
    }

    else if (tmpStr.equals(Key)) {
      flag = false;
      return SKIP_BODY;
    }
    else {
      flag = true;
      return EVAL_BODY_AGAIN;
    }

  }

  public int doEndTag() throws JspTagException {
    if (flag) {
      try {

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

  /**
   * 结束body
   * @return int
   * @throws JspTagException
   */
  public int doAfterBody() throws JspTagException {
    return EVAL_PAGE;

  }

}