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Struts2<4>OGNL2

2014-12-31 09:59 197 查看
OGNL 访问复杂对象

1，访问 javaBean 对象；

2，访问集合对象；

3，访问 Map 对象；

public class HelloAction extends ActionSupport {

private Student student;//javaBean

private List<Student> students;//List

private Map<String, Student> studentMap;//Map

public Map<String, Student> getStudentMap() {
return studentMap;
}

public void setStudentMap(Map<String, Student> studentMap) {
this.studentMap = studentMap;
}

public List<Student> getStudents() {
return students;
}

public void setStudents(List<Student> students) {
this.students = students;
}

public Student getStudent() {
return student;
}

public void setStudent(Student student) {
this.student = student;
}

@Override
public String execute() throws Exception {

<span style="white-space:pre">	</span>	student = new Student("小扒", 12);

students = new ArrayList<Student>();
students.add(new Student("老九", 13));
students.add(new Student("老十", 14));

studentMap = new HashMap<String, Student>();
studentMap.put("goodStudent", new Student("学霸", 20));
studentMap.put("badStudent", new Student("学渣", 19));
return SUCCESS;
}

}


ognl访问javaBean对象：<s:property value="student.name"/>
<s:property value="student.age"/><br/>
ognl访问List集合：<s:property value="students[0].name"/>
<s:property value="students[0].age"/><br/>
<s:property value="students[1].name"/>
<s:property value="students[1].age"/><br/>
ognl访问Map：<s:property value="studentMap['goodStudent'].name"/>
<s:property value="studentMap['goodStudent'].age"/><br/>
<s:property value="studentMap['badStudent'].name"/>
<s:property value="studentMap['badStudent'].age"/><br/>


OGNL 访问静态方法和属性

1，访问静态属性；

2，访问静态方法；<constant name="struts.ognl.allowStaticMethodAccess" value="true"></constant>



package com.cc.common;

public class MyStatic {

public static final String str="百度";

public static String printUrl(){
System.out.println("http://www.baidu.com");
return "http://www.baidu.com";
}
}
struts.xml

<struts>

<constant name="struts.ognl.allowStaticMethodAccess" value="true"></constant>

</struts>


<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<%@taglib prefix="s" uri="/struts-tags" %>
<!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 here</title>
</head>
<body>
访问静态属性： <s:property value="@com.cc.common.MyStatic@str"/><br/>
访问静态方法：<s:property value="@com.cc.common.MyStatic@printUrl()"/>
</body>
</html>
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