实现一个自定义 table 标签

　　需求是有两个自定义的标签<table>和<column>

<table>有个items属性，负责导入数据

package hello;

import java.util.HashMap;
import java.util.Map;

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

public class Column extends TagSupport {
    private String property;
    private String label;

    public int doStartTag() throws JspException {
        if (!(this.getParent() instanceof Table)) {
            throw new JspException("Column must be inside table.");
        }
        Map<String, String> column = new HashMap<String, String>();
        column.put("label", label);
        column.put("property", property);
        Table table = (Table) this.getParent();
        table.getColumns().add(column);
        return SKIP_BODY;
    }

    public int doEndTag() throws JspException {
        return EVAL_PAGE;
    }

    public void setLabel(String label) {
        this.label = label;
    }

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

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