jsp自定义标签2

自定义标签2

自定义标签开发步骤

1.1 助手类
1.2 tld
1.3 taglib

助手类

package com.jsp.day01;

import javax.servlet.jsp.JspException;
import javax.servlet.jsp.tagext.BodyTagSupport;

public class SetTag extends BodyTagSupport {
	private static final long serialVersionUID = 1L;
	
	private String var;
	private Object value;
	
	@Override
	public int doStartTag() throws JspException {
		pageContext.setAttribute(var, value);
		return SKIP_BODY;
	}
	
	
	public String getVar() {
		return var;
	}
	public void setVar(String var) {
		this.var = var;
	}
	public Object getValue() {
		return value;
	}
	public void setValue(Object value) {
		this.value = value;
	}
	
	

}

package com.jsp.day01;

import java.io.IOException;

import javax.servlet.jsp.JspException;
import javax.servlet.jsp.JspWriter;
import javax.servlet.jsp.tagext.BodyTagSupport;

public class OutTag extends BodyTagSupport {

	private static final long serialVersionUID = -7145740997812717669L;

	private Object value;
	
	
	
	

	public Object getValue() {
		return value;
	}

	public void setValue(Object value) {
		this.value = value;
	}
	
	@Override
	public int doStartTag() throws JspException {
		JspWriter out = pageContext.getOut();
		try {
			out.print(value.toString());
		} catch (IOException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		return SKIP_BODY;
	}
	
}

tld

   

    set

    com.jsp.day01.SetTag

    JSP
    

        var

        true

        false
    
    

        value

        true

        true
    
  
  
  
  
    

    out

    com.jsp.day01.OutTag

    JSP
    

        value

        true

        true
    
  

taglib

最后一步就是导入自己的标签库

<%@page import="com.jsp.day01.Student"%>
<%@page import="java.util.ArrayList"%>
<%@page import="java.util.List"%>
<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<%@ taglib prefix="z" uri="/zking" %>







	
		

select标签

助手类

package com.jsp.day01;

import java.io.IOException;
import java.lang.reflect.Field;
import java.lang.reflect.InvocationTargetException;
import java.util.ArrayList;
import java.util.List;

import javax.servlet.jsp.JspException;
import javax.servlet.jsp.JspWriter;
import javax.servlet.jsp.tagext.BodyTagSupport;

import org.apache.commons.beanutils.PropertyUtils;


/**
 * 1.值的传递  id,name
 * 2.class（可要可不要）
 * 数据源   items
 * 3.展示列(用户可看的)与数据存(value)储列与实体类的对应关系 textKey textvalue
 * 4.数据回显 选中了需要回显 selectedVal
 * 5.可能下拉框有默认值（头标签）  headerTextKey headerTextVal
 * 
 * 
 * @author lqx
 *
 */
public class SelectTag extends BodyTagSupport {

	private static final long serialVersionUID = 4901181316672465145L;
	private String name;
	private String id;
	private List