Java自定义JSP标签示例-优快云博客

本文链接：https://blog.youkuaiyun.com/wangfu_02/article/details/84214221

java实现自定义标签需要继承extends javax.servlet.jsp.tagext.TagSupport类。

编写第一个自定义标签，包括两个文本框

package tag;

import java.io.IOException;

import javax.servlet.jsp.JspException;

public class firsetTag extends javax.servlet.jsp.tagext.TagSupport {

    private String t1;
    private String t2;

    public String getT1() {
        return t1;
    }

    public void setT1(String t1) {
        this.t1 = t1;
    }

    public String getT2() {
        return t2;
    }

    public void setT2(String t2) {
        this.t2 = t2;
    }

    @Override
    public int doStartTag() throws JspException {
        // TODO Auto-generated method stub
        String sHtml="<input type=\"text\" value=\""+this.getT1()+"\">";
        sHtml+="<input type=\"text\" value=\""+this.getT2()+"\">";
        try
        {
           this.pageContext.getOut().write(sHtml);
        }catch(IOException ex)
        {
            throw new JspException(ex.getMessage());
        }
        return this.EVAL_PAGE;   //继续执行
    }

}

编写自定义标签的配置文件,MyXml.xml

<?xml version="1.0" encoding="UTF-8"?>

<taglib>
   <tlib-version>2.2.3</tlib-version>
   <jsp-version>1.2</jsp-version>
   <short-name>wangfu Common Taglib</short-name>
   <uri>/wangfu</uri>
   <tag>
   <name>firsetTag</name>
        <tag-class>tag.firsetTag</tag-class>
        <body-content>empty</body-content>
        <attribute>
           <name>t1</name>
           <required>true</required>
           <rtexprvalue>true</rtexprvalue>
        </attribute>
   </tag>
</taglib>

在web.xml中的配置

<jsp-config>
        <taglib>
             <taglib-uri>/th</taglib-uri>
             <taglib-location>/WEB-INF/tlds/MyXml.xml</taglib-location>
        </taglib>
     </jsp-config>

在jsp里面中使用：

<%@ taglib prefix="wangfu" uri="/th" %>