Jsp 自定义标签嵌套

// 外层标签 package tao.tag; import java.util.HashMap; import java.util.Map; import javax.servlet.jsp.JspException; import javax.servlet.jsp.tagext.BodyTagSupport; public class OutTag extends BodyTagSupport{ /** * */ private static final long serialVersionUID = 1L; private Map<String,String> params = new HashMap<String, String>(); @Override public int doStartTag() throws JspException { return EVAL_BODY_INCLUDE; } @Override public int doEndTag() throws JspException { System.out.println(this.params); return super.doEndTag(); } public void put(String key,String value){ this.params.put(key, value); } }

//内层标签 package tao.tag; import javax.servlet.jsp.JspException; import javax.servlet.jsp.tagext.Tag; import javax.servlet.jsp.tagext.TagSupport; public class InTag extends TagSupport { /** * */ private static final long serialVersionUID = 1L; private String username; private String password; public void setUsername(String username) { this.username = username; } public void setPassword(String password) { this.password = password; } @Override public int doStartTag() throws JspException { return EVAL_PAGE; } @Override public int doEndTag() throws JspException { Tag t = findAncestorWithClass(this, OutTag.class); OutTag parent = (OutTag) t; parent.put(username, password); return super.doEndTag(); } }

//tld <?xml version="1.0" encoding="UTF-8"?> <!DOCTYPE taglib PUBLIC "-//Sun Microsystems, Inc.//DTD JSP Tag Library 1.2//EN" "web-jsptaglibrary_1_2.dtd" > <taglib> <tlib-version>1.2</tlib-version> <jsp-version>1.2</jsp-version> <tag> <name>out</name> <tag-class>tao.tag.OutTag</tag-class> </tag> <tag> <name>in</name> <tag-class>tao.tag.InTag</tag-class> <attribute> <name>username</name> <required>false</required> <rtexprvalue>false</rtexprvalue> </attribute> <attribute> <name>password</name> <required>false</required> <rtexprvalue>false</rtexprvalue> </attribute> </tag> </taglib>

// JSP <%@ taglib uri="WEB-INF/tld/tag.tld" prefix="pg"%> <pg:out> <pg:in username="id789" password="iop"></pg:in> </pg:out>