ArrayList输出问题的问题?
小弟把一个表写到一个ArrayList中
WareBean wareBean=new WareBean();
wareBean.setWareID(rs.getString("wareID") );
wareBean.setWareName(rs.getString("wareName") );
wareBean.setWarePrice(rs.getInt("warePrice") );
arr.add(wareBean);
}
request.setAttribute("arr",arr);
现在想在jsp页面输出表的内容
应该怎样做啊?
<%
ArrayList arr=new ArrayList();
arr = (ArrayList) request.getAttribute("arr");
for (int i = 0; i < arr.size(); i++) {
%>
<tr>
<td>
<%=arr.get(i)%>
</td>
</tr>
<% }%>
应该怎样改啊
[解决办法]
问题不清不楚，你上面不都已经把需在页面里的JAVA代码打印出来了，还要做什么
可以在
<body>
<form>
<table border="5">
<tr>
//在下面输出你要打印出的列名，有几项输几项,然后在后台加上一个用来存放动态数组的类
<th>wareID</th>
<th>wareName</th>
<th>warePrice</th>
</tr>
<%
ArrayList arr=new ArrayList
arr = (ArrayList) request.getAttribute("arr");
for (int i = 0; i < arr.size(); i++) {
DynamicEntity entity=new DynamicEntity();
%>
<tr >
<td><%=entity.get("wareID")% ></td>
<td><%=entity.get("wareName")% ></td>
<td><%=entity.get("warePrice")% ></td>
</tr >
<% }% >
</table>
</form>
</body>
在Bean里先建一个DynamicEntity类，代码如下：
public class DynamicEntity(){
private HashMap entity;
public DynamicEntity(){
entity=new HashMap();
}
public void set(String key,String value){
this.entity.put(key,value);
}
public String get(String key){
return (String)enttiy.get(key);
}
}
[解决办法]
have a try
<%
ArrayList arr=new ArrayList();
arr = (ArrayList) request.getAttribute("arr");
for (int i = 0; i < arr.size(); i++) {
Object obj = arr.get(i);
if (obj instanceof wareBean) {
wareBean wb = (wareBean)obj;
//out.println(wb.getWareID()); so on...
//do something here
}
}
% >
