jsp通过自定义标签库实现数据列表显示的方法_JSP编程_

 package com.yanek.cms.tag; import java.io.IOException; import java.util.ArrayList; import java.util.Iterator; import java.util.List; import javax.servlet.jsp.JspException; import javax.servlet.jsp.tagext.BodyTagSupport; import com.yanek.cms.vo.UserInfo; public class UserListTag extends BodyTagSupport { private String name;// 一个属性名 private Iterator it;// 要迭代的对象 private int cateid; // 用户类别id @Override public int doEndTag() throws JspException { try { if (bodyContent != null) { bodyContent.writeOut(bodyContent.getEnclosingWriter()); } } catch (IOException e) { e.printStackTrace(); } return EVAL_PAGE; } @Override public int doStartTag() throws JspException { //这里根据用户类型,构造不同的列表数据,实现可以根据数据库获取 List users = new ArrayList(); if (cateid == 1) { users.add(new UserInfo("张三", 20, "Zhangsan@163.com")); users.add(new UserInfo("李四", 30, "Lisi@sina.com")); } else { users.add(new UserInfo("王五", 33, "Wangwu@qq.com")); users.add(new UserInfo("赵六", 33, "zhaoliu@qq.com")); } it = users.iterator(); if (it == null) { return SKIP_BODY; } else { return continueNext(); } } private int continueNext() { if (it.hasNext()) { pageContext.setAttribute(name, it.next(), pageContext.PAGE_SCOPE); return EVAL_BODY_TAG; } else { return SKIP_BODY; } } @Override public int doAfterBody() { return continueNext(); } public String getName() { return name; } public void setName(String name) { this.name = name; } public int getCateid() { return cateid; } public void setCateid(int cateid) { this.cateid = cateid; } } 

1.01.0cmshttp://www.58tech.cn/mystruts/tags-cmsuserListTagcom.yanek.cms.tag.UserListTagjspnamecom.yanek.cms.vo.UserInfotrueNESTEDnametruecateidtrue

index.jsp/tags/my-cms/WEB-INF/my_cms_tag.tld

<%@ page language="java" import="java.util.*,com.yanek.cms.vo.*" pageEncoding="UTF-8"%><%@ taglib uri="/tags/my-cms" prefix="myTag" %><% String path = request.getContextPath(); String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/"; %>
UserName
Age
Email
<%=user_info1.getUserName() %>
<%=user_info1.getAge() %>
<%=user_info1.getEmail() %>
UserName
Age
Email
<%=user_info2.getUserName() %>
<%=user_info2.getAge() %>
<%=user_info2.getEmail() %>

 package com.yanek.cms.vo; public class UserInfo { private int age; private String userName; private String email; public int getAge() { return age; } public void setAge(int age) { this.age = age; } public String getUserName() { return userName; } public void setUserName(String userName) { this.userName = userName; } public String getEmail() { return email; } public void setEmail(String email) { this.email = email; } public UserInfo(String userName,int age, String email) { super(); this.age = age; this.userName = userName; this.email = email; } public UserInfo() { } }