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QueryAction.java
package com.jeedroid.action;
import java.util.Map;
import javax.Servlet.http.HttpServletRequest;
import org.apache.struts2.ServletActionContext;
import com.jeedroid.dao.BookDao;
import com.opensymphony.xwork2.ActionContext;
import com.opensymphony.xwork2.ActionSupport;
public class QueryAction extends ActionSupport {
private String name;
private Map<String,Integer> result;
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public Map<String, Integer> getResult() {
return result;
}
public void setResult(Map<String, Integer> result) {
this.result = result;
}
public String execute()
{
try
{
BookDao book=new BookDao();
Map<String,Integer> books=book.getBooks(name);
setResult(books);
return "succ";
}
catch(Exception e)
{
return "error";
}
}
}
BookDao.java
package com.jeedroid.dao;
import java.util.LinkedHashMap;
import java.util.Map;
public class BookDao {
private static Map<String,Integer> books=new LinkedHashMap<String,Integer>();
static
{
books.put("j2ee整合开发", 56);
books.put("php从入门到精通", 20);
books.put("Java Web开发详解", 22);
}
public Map<String,Integer> getBooks(String name)
{
Map<String,Integer> books=new LinkedHashMap<String,Integer>();
for(Map.Entry<String, Integer> entry:BookDao.books.entrySet())
{
if(entry.getKey().toLowerCase().contains(name.toLowerCase()))
{
books.put(entry.getKey(), entry.getValue());
}
}
return books;
}
}
struts2.xml :
<package name="default" extends="struts-default">
<action name="query" class="com.jeedroid.action.QueryAction">
<result name="succ">
/result.jsp
</result>
<result name="error">/error.jsp</result>
</action>
</package>
result.jsp
<body>
<table border="1">
<tr><td>书名</td><td>价格</td></tr>
<%
Map<String,Integer> result=(Map<String,Integer>)request.getAttribute("result");
for(Map.Entry<String,Integer> entry:result.entrySet())
{
%>
<tr>
<td><%=entry.getKey() %></td>
<td><%=entry.getValue() %></td>
</tr>
<%
}
%>
</table>
</body>
在result.jsp里面有一个request.getAttribute("result");请问这个"result"是怎么传过来的，什么时候有这个东西的，在Action里面她只是一个对象啊，而且没有setAttribute("result",books);这里怎么回事啊？ |
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发表于 2011-10-29 09:20:46