Jsp uses the custom tag library to display the data list.
This example describes how to display the data list in jsp by using a custom tag library. We will share this with you for your reference. The details are as follows:
1. Define the tag Library Class UserListTag. java
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; // an attribute name private Iterator it; // private int cateid of the object to be iterated; // user category 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 {// different list data is constructed based on the user type, you can obtain the List <UserInfo> users = new ArrayList <UserInfo> (); if (cateid = 1) {users. add (new UserInfo ("Michael", 20, "Zhangsan@163.com"); users. add (new UserInfo ("", 30, "Lisi@sina.com");} else {users. add (new UserInfo ("Wang Wu", 33, "Wangwu@qq.com"); users. add (new UserInfo ("Zhao ", 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 ;}}
2. Create the tag library description file my_cms_tag.tld in the WEB-INF directory:
My_cms_tag.tld
<?xml version="1.0" encoding="UTF-8"?><!DOCTYPE taglib PUBLIC "-//Sun Microsystems, Inc.//DTD JSP Tag Library 1.1//EN" "http://java.sun.com/j2ee/dtds/web-jsptaglibrary_1_1.dtd"><taglib><tlibversion>1.0</tlibversion><jspversion>1.0</jspversion><shortname>cms</shortname><uri>http://www.58tech.cn/mystruts/tags-cms</uri><!-- userListTag start --> <tag> <name>userListTag</name> <tag-class>com.yanek.cms.tag.UserListTag</tag-class> <body-content>jsp</body-content> <variable> <!--<name-given>user_info</name-given>--> <name-from-attribute>name</name-from-attribute> <variable-class>com.yanek.cms.vo.UserInfo</variable-class> <declare>true</declare> <scope>NESTED</scope> </variable> <attribute> <name>name</name> <required>true</required> </attribute> <attribute> <name>cateid</name> <required>true</required> </attribute></tag><!-- userListTag end --></taglib>
3. web. xml configuration
<?xml version="1.0" encoding="UTF-8"?><web-app version="2.5" xmlns="http://java.sun.com/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"> <welcome-file-list> <welcome-file>index.jsp</welcome-file> </welcome-file-list> <taglib> <taglib-uri>/tags/my-cms</taglib-uri> <taglib-location>/WEB-INF/my_cms_tag.tld</taglib-location> </taglib></web-app>
4. jsp call
<%@ 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+"/";%><!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">Object Class Definition
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() { }}The running effect is as follows (URL input: http: // 127.0.0.1: 8080/TestCMS/page/userlist. jsp)
Click here to download the complete instance code.
I hope this article will help you with Android program design.
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