valueresulttag.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 java.io.*;
import java.util.*;
import javax.servlet.jsp.*;
import javax.servlet.jsp.tagext.*;

import com.trulytech.mantis.result.*;

/**
 *
 * <p>Title: Mantis</p>
 *
 * <p>Description: 根据给定的列值获得DBResult中的值</p>
 *
 * <p>Copyright: Copyright (c) 2002</p>
 *
 * <p>Company: </p>
 *
 * @author Wang Xian
 * @version 1.0
 */
/*例如********************************************************
 <bean:get name="Result" col="0" />

 <bean:get name="Result" col="0" row="1"/>

 <bean:get name="Result" col="0" row="1" type="html"/>

 */
public class ValueResultTag
    extends TagSupport {

//行数
  private int Col = 0;
//列数
  private int Row = 0;
//输出格式
  private String Type = "";

//request中DBResult的值
  private String name = null;

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

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

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

  public void setRow(int Row) {
    this.Row = Row;
  }

  public void setType(String Type) {
    if (Type == null)
      this.Type = "";
    else
      this.Type = Type;
  }

  /**
   * 结束tag
   * @return int
   * @throws JspTagException
   */
  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)).ResultBuffer.
              size() > Row) {
            ArrayList rec = (ArrayList) ( ( (DBResult)this.pageContext.
                                           findAttribute(name)).ResultBuffer).
                get(Row);
            if (Col >= rec.size())
              this.pageContext.getOut().write("");
            else
            //如果是html输出
            if (this.Type.equalsIgnoreCase("html"))
              this.pageContext.getOut().write(com.trulytech.mantis.system.
                                              Properties.HTMLEncoder( ( (
                  DBColumn) rec.get(Col)).Value));
            //如果是普通输出
            else
              this.pageContext.getOut().write( ( (DBColumn) rec.get(Col)).Value);
          }
          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;
  }
}