我正在尝试访问 HTML 参数并将其与位于数组列表中的 Java Bean 变量进行比较。下面是我所拥有的，但当 JSP 页面转发时它不起作用。返回 JSP 的骨架，但没有从数组接收到任何信息。
itemBean item = new itemBean();
collection coll = new collection();
List<itemBean> songs= coll.getItems();
for(int i = 0; i < songs.size(); i++) {
if(action.equals(songs.get(i).getItemCode())) {
item.setItemCode(songs.get(i).getItemCode());
item.setSong(songs.get(i).getSong());
item.setArtist(songs.get(i).getArtist());
item.setSongURL(songs.get(i).getSongURL());
item.setDesc(songs.get(i).getDesc());
request.setAttribute("itemBean", item);
}
}
JSP 页面:
<%@page contentType="text/html" pageEncoding="UTF-8"%>
<!DOCTYPE html>
<%@page import="my.pack.collection" %>
<%@include file="/header.jsp"%>
<%@include file="/user-navigation.jsp"%>
<%@include file="/site-navigation.jsp"%>
<div id="productList">
<h5><a href="categories.jsp">back</a></h5>
<h2>Lesson 1</h2>
<% if ((request.getAttribute("itemCode")) != null ){ %>
<jsp:include page="item.jsp" flush="true"/>
<% }%>
<ul>
<li><a>Song: ${itemBean.song}</a></li><br>
<li><b>Artist: ${itemBean.artist}</b></li><br>
<li><img src=${itemBean.songURL}> </li><br>
<p> Lyrics: ${itemBean.desc}</p><br>
<form action="feedback.jsp" method="post">
<input type="text" name="song"/> <br />
<input type="text" name="artist"/><br />
<button type="submit" id="save"> Save! </button>
<button type="submit" id="rate"> Rate It</button>
</form>
</ul>
</div>
<%@include file="/footer.jsp" %>
Java 集合:包含所需信息的 JavaBean 数组列表。
package my.pack;
/*
* To change this license header, choose License Headers in Project Properties.
* To change this template file, choose Tools | Templates
* and open the template in the editor.
*/
import java.util.*;
/**
*
* @author Anastasia
*/
public class collection{
private List<itemBean> Song;
public collection(){
Song = new ArrayList<>();
//String itemCode;
//itemBean item = new itemBean();
Song.add(new itemBean("S1", "View","SHINee","Song",
"모두 할 말을 잃지 like you<br>\n,
"","/image/viewShinee.jpg"));
Song.add(new itemBean("S2","Pray","FTIsland","Song",
"또 다른 현실 속에 속삭이던 많은 거짓말<br>\n",
"","/image/pray_FTIsland.jsp"));
Song.add(new itemBean("S3","X","Monsta X","Song",
"Yeah ah yeah hey hey hey<br>\n" ,
"","/image/X_MonstaX.jpg"));
Song.add(new itemBean("OST3","Stay With Me", "Punch & Chanyeol(EXO)","OST"," 나의 두 눈을 감으면 <br>\n" ,
"", "/image/GoblinOST.jpg"));
Song.add(new itemBean("OST2","Before the Sunset--Goblin OST","Eric Name", "OST",
"나즈막히 건넨 인사가<br>\n",
"","/image/MadDogOST.jpg"));
Song.add(new itemBean("OST3","You Are My Everything", "Gummy","OST",
"처음부터 그대였죠<br>\n" ,
"","/image/DOTS.jpg"));
}
public List<itemBean> getItems(){
return Song;
}
}
最佳答案
我怀疑错误可能是您没有 request.在你的 EL 中；你尝试过${request.itemBean.song} ？
你真的应该:
- 变量名以小写字母开头
- 类名以大写字母开头
- 使用
Map<String, ItemBean>保存您的歌曲 Collection - 使用有意义的名称，例如 Song，而不是 ItemBean
关于java - 是否可以将 HTML 参数与列表中的 Java Bean 变量进行比较？，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/49213651/