第22講 struts2-OGNL訪問靜態方法和屬性
阿新 • • 發佈：2018-11-11
在HeadFirstStruts2chapter04 專案中，
1新建com.cruise.common,Mystatic類，寫靜態方法和靜態屬性，MyStatic 並沒有繼承ActionSupport
package com.cruise.common;
public class MyStatic {
public static final String str="www.cruiseloveashley.com";
public
return "cruiseloveAshley";
}
}
2success.jsp，
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<%@taglib prefix="s"
DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN""http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Insert title heretitle>
head>
<body>
ognl
ognl訪問List集合的資料：<s:property value="students[0].name"/><s:property value="students[0].age"/><br>
ognl訪問List集合的資料：<s:property value="students[1].name"/><s:property value="students[1].age"/><br>
ognl訪問Map集合的資料：<s:property value="studentMap['goodStudent'].name"/><s:propertyvalue="studentMap['goodStudent'].age"/><br>
ognl訪問Map集合的資料：<s:property value="studentMap['badStudent'].name"/><s:propertyvalue="studentMap['badStudent'].age"/><br>
ognl訪問靜態屬性的資料：<s:property value="@[email protected]"/><br>
ognl訪問靜態屬性的資料：<s:property value="@[email protected]()"/><br>
body>
html>
3struts.xml 新增配置 ，允許訪問靜態方法，
<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE struts PUBLIC
"-//Apache Software Foundation//DTD Struts Configuration 2.0//EN"
"http://struts.apache.org/dtds/struts-2.0.dtd">
<struts>
<constant name="struts.ognl.allowStaticMethodAccess" value="true"></constant>
<package name="manage" namespace="/" extends="struts-default">
<action name="hello" class="com.cruise.action.HelloAction" >
<result name="success" >success.jsp</result>
</action>
</package>
</struts>
HelloAction如下：
package com.cruise.action;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import com.cruise.model.Student;
import com.opensymphony.xwork2.ActionSupport;
public class HelloAction extends ActionSupport{
private Student student;
private List students;
private Map studentMap;
public Student getStudent() {
return student;
}
public void setStudent(Student student) {
this.student = student;
}
public List getStudents() {
return students;
}
public void setStudents(List students) {
this.students = students;
}
public Map getStudentMap() {
return studentMap;
}
public void setStudentMap(Map studentMap) {
this.studentMap = studentMap;
}
@Override
public String execute() throws Exception {
student= new Student("小八","21");
students = new ArrayList();
students.add(new Student("ashely","23"));
students.add(new Student("jack","45"));
studentMap = new HashMap();
studentMap.put("goodStudent", new Student("cruise","26"));
studentMap.put("badStudent", new Student("Tom","23"));
return "success";
}
}
4測試:本案例中HelloAction中並沒有太多作用，只不過實現了跳轉頁面。
http://localhost:8080/HeadFirstStruts2chapter04/hello