自定义标签库_tag

1）最简单的标签库

　　1，继承Tag接口，重写doEndTag()方法,返回类型不同后面流程不一样

　　　　想要jsp的内容必须重写了setPageContent（）方法

　　　　再JspWriter out = pageContext.getOut();

package myTag;

import java.io.IOException;
import java.util.ResourceBundle;

import javax.servlet.jsp.JspException;
import javax.servlet.jsp.JspWriter;
import javax.servlet.jsp.PageContext;
import javax.servlet.jsp.tagext.Tag;

public class Copyright implements Tag {
    private PageContext pageContext;
    private Tag parent;

    @Override
    public int doEndTag() throws JspException {
        // TODO Auto-generated method stub
        JspWriter out = pageContext.getOut();
        try {
            out.println("<div align=center style='line-height:22px;"
                    + "font-size:12px;'>");
            out.println(ResourceBundle.getBundle("copyright").getString(
                    "copyright"));
            out.println("</div>");
        } catch (IOException e) {
            throw new JspException(e);
        }

        return EVAL_PAGE;
    }

    @Override
    public int doStartTag() throws JspException {
        // TODO Auto-generated method stub
        return SKIP_BODY;
    }

    @Override
    public Tag getParent() {
        // TODO Auto-generated method stub
        return this.parent;
    }

    @Override
    public void release() {
        // TODO Auto-generated method stub

    }

    @Override
    public void setPageContext(PageContext pc) {
        // TODO Auto-generated method stub
        this.pageContext = pc;
    }

    @Override
    public void setParent(Tag t) {
        // TODO Auto-generated method stub
        this.parent = t;
    }
}

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