struts2 OGNL的用法介绍 - JAVA

n person1 = new Person(); person1.setName("zhangsan"); Person person2 = new Person(); person2.setName("lisi"); Person person3 = new Person(); person3.setName("wangwu"); /* person4不放入到上下文环境中*/ Person person4 = new Person(); person4.setName("zhaoliu"); /* 将person1、person2、person3添加到环境中（上下文中）*/ context.put("person1", person1); context.put("person2", person2); context.put("person3", person3); try { /* 获取根对象的"name"属性值*/ Object value = Ognl.getValue("name", context, person2); System.out.println("ognl expression \"name\" eva luation is : " + value); /* 获取根对象的"name"属性值*/ Object value2 = Ognl.getValue("#person2.name", context, person2); System.out.println("ognl expression \"#person2.name\" eva luation is : " + value2); /* 获取person1对象的"name"属性值*/ Object value3 = Ognl.getValue("#person1.name", context, person2); System.out.println("ognl expression \"#person1.name\" eva luation is : " + value3); /* 将person4指定为root对象，获取person4对象的"name"属性，注意person4对象不在上下文中*/ Object value4 = Ognl.getValue("name", context, person4); System.out.println("ognl expression \"name\" eva luation is : " + value4); /* 将person4指定为root对象，获取person4对象的"name"属性，注意person4对象不在上下文中*/ Object value5 = Ognl.getValue("#person4.name", context, person4); System.out.println("ognl expression \"person4.name\" eva luation is : " + value5); /* 获取person4对象的"name"属性，注意person4对象不在上下文中*/ // Object value6 = Ognl.getValue("#person4.name", context, person2); // System.out.println("ognl expression \"#person4.name\" eva luation is : " + value6); }

public static void main(String[] args) { /* OGNL提供的一个上下文类，它实现了Map接口*/ OgnlContext context = new OgnlContext(); People people1 = new People(); people1.setName("zhangsan"); People people2 = new People(); people2.setName("lisi"); People people3 = new People(); people3.setName("wangwu"); context.put("people1", people1); context.put("people2", people2); context.put("people3", people3); context.setRoot(people1); try { /* 调用成员方法*/ Object value = Ognl.getValue("name.length()", context, context.getRoot()); System.out.println("people1 name length is :" + value); Object upperCase = Ognl.getValue("#people2.name.toUpperCase()", context, context.getRoot()); System.out.println("people2 name upperCase is :" + upperCase); Object invokeWithArgs = Ognl.getValue("name.charAt(5)", context, context.getRoot()); System.out.println("people1 name.charAt(5) is :" + invokeWithArgs); /* 调用静态方法*/ Object min = Ognl.getValue("@java.lang.Math@min(4,10)", context, context.getRoot()); System.out.println("min(4,10) is :" + min); /* 调用静态变量*/ Object e = Ognl.getValue("@java.lang.Math@E", context, context.getRoot()); System.out.println("E is :" + e); }

public static void main(String[] args) throws Exception { OgnlContext context = new OgnlContext(); Classroom classroom = new Classroom(); classroom.getStudents().add("zhangsan"); classroom.getStudents().add("lisi"); classroom.getStudents().add("wangwu"); classroom.getStudents().add("zhaoliu"); classroom.getStudents().add("qianqi"); Student student = new Student(); student.getContactWay

struts2 OGNL的用法介绍(二)