ognl表达式语法（取值，赋值，调用方法，调用静态方法，创建对象List，Map）

桃扇骨 2022-04-23 00:40 185阅读 0赞

准备：创建一个User实体

public class User {
    	private String name;
    	private Integer age;
    	public User(String name, Integer age) {
    		super();
    		this.name = name;
    		this.age = age;
    	}
    	public String getName() {
    		return name;
    	}
    	public void setName(String name) {
    		this.name = name;
    	}
    	public Integer getAge() {
    		return age;
    	}
    	public void setAge(Integer age) {
    		this.age = age;
    	}
    	
    }

1.取值：

@Test
    	public void func2() throws OgnlException{
    		User tom = new User("tom",12);
    		
    		Map<String,User> hashMap = new HashMap<>();
    		hashMap.put("user1", new User("jack",20));
    		hashMap.put("user2", new User("john",21));
    		
    		OgnlContext ognlContext = new OgnlContext();
    		ognlContext.setRoot(tom);
    		ognlContext.setValues(hashMap);
    		
    		String name = (String) Ognl.getValue("name", ognlContext, ognlContext.getRoot());
    		Integer age = (Integer) Ognl.getValue("age", ognlContext, ognlContext.getRoot());
    		System.out.println("name:"+name);
    		System.out.println("age:"+age);
    	}

@Test
    	public void func3() throws OgnlException{
    		User tom = new User("tom",12);
    		
    		Map<String,User> hashMap = new HashMap<>();
    		hashMap.put("user1", new User("jack",20));
    		hashMap.put("user2", new User("john",21));
    		
    		OgnlContext ognlContext = new OgnlContext();
    		ognlContext.setRoot(tom);
    		ognlContext.setValues(hashMap);
    		
    		String name = (String) Ognl.getValue("#user1.name", ognlContext, ognlContext.getRoot());
    		Integer age = (Integer) Ognl.getValue("#user2.age", ognlContext, ognlContext.getRoot());
    		System.out.println("name:"+name);
    		System.out.println("age:"+age);
    	}

2.赋值：

@Test
    	public void func4() throws OgnlException{
    		User tom = new User("tom",12);
    		
    		Map<String,User> hashMap = new HashMap<>();
    		hashMap.put("user1", new User("jack",20));
    		hashMap.put("user2", new User("john",21));
    		
    		OgnlContext ognlContext = new OgnlContext();
    		ognlContext.setRoot(tom);
    		ognlContext.setValues(hashMap);
    		
    		Ognl.getValue("name='jerry1'", ognlContext, ognlContext.getRoot());
    		Ognl.getValue("#user1.name='jerry2'", ognlContext, ognlContext.getRoot());
    		String name1 = (String) Ognl.getValue("name", ognlContext, ognlContext.getRoot());
    		String name2 = (String) Ognl.getValue("#user1.name", ognlContext, ognlContext.getRoot());
    		
    		System.out.println(name1);
    		System.out.println(name2);
    		
    	}

3.调用方法：

@Test
    	public void func5() throws OgnlException{
    		User tom = new User("tom",12);
    		
    		Map<String,User> hashMap = new HashMap<>();
    		hashMap.put("user1", new User("jack",20));
    		hashMap.put("user2", new User("john",21));
    		
    		OgnlContext ognlContext = new OgnlContext();
    		ognlContext.setRoot(tom);
    		ognlContext.setValues(hashMap);
    		
    		Ognl.getValue("setName('lili')", ognlContext, ognlContext.getRoot());
    		Ognl.getValue("#user1.setName('lucy1')", ognlContext, ognlContext.getRoot());
    		String name = (String)Ognl.getValue("#user1.getName()", ognlContext, ognlContext.getRoot());
    		System.out.println(name);
    		
    		
    	}

4.调用静态方法：

@Test
    	public void func6() throws OgnlException{
    		User tom = new User("tom",12);
    		
    		Map<String,User> hashMap = new HashMap<>();
    		hashMap.put("user1", new User("jack",20));
    		hashMap.put("user2", new User("john",21));
    		
    		OgnlContext ognlContext = new OgnlContext();
    		ognlContext.setRoot(tom);
    		ognlContext.setValues(hashMap);
    		
    
    		double a = (double) Ognl.getValue("@java.lang.Math@PI", ognlContext,ognlContext.getRoot());
    		String name = (String)Ognl.getValue("@com.it.utils.AutoUtils@echo('hello world!')", ognlContext, ognlContext.getRoot());
    		
    		System.out.println(a);
    		System.out.println(name);
    	}

5.创建List，Map：

@Test
    	public void func7() throws OgnlException{
    		User tom = new User("tom",12);
    		
    		Map<String,User> hashMap = new HashMap<>();
    		hashMap.put("user1", new User("jack",20));
    		hashMap.put("user2", new User("john",21));
    		
    		OgnlContext ognlContext = new OgnlContext();
    		ognlContext.setRoot(tom);
    		ognlContext.setValues(hashMap);
    		
    		Integer size = (Integer)Ognl.getValue("{'list0','list1','list2','list3'}.size()", ognlContext, ognlContext.getRoot());
    		String value1 = (String)Ognl.getValue("{'list0','list1','list2','list3'}[0]", ognlContext, ognlContext.getRoot());
    		String value2 = (String)Ognl.getValue("{'list0','list1','list2','list3'}[1]", ognlContext, ognlContext.getRoot());
    		String value3 = (String)Ognl.getValue("{'list0','list1','list2','list3'}.get(3)", ognlContext, ognlContext.getRoot());
    		
    		System.out.println(size);
    		System.out.println(value1);
    		System.out.println(value2);
    		System.out.println(value3);
    		
    		Integer mapSize = (Integer)Ognl.getValue("#{'name':'tom','age':12}.size()", ognlContext, ognlContext.getRoot());
    		String name = (String)Ognl.getValue("#{'name':'tom','age':12}['name']", ognlContext, ognlContext.getRoot());
    		Integer age1 = (Integer) Ognl.getValue("#{'name':'tom','age':12}['age']", ognlContext, ognlContext.getRoot());
    		Integer age2 = (Integer) Ognl.getValue("#{'name':'tom','age':12}.get('age')", ognlContext, ognlContext.getRoot());
    		
    		System.out.println(mapSize);
    		System.out.println(name);
    		System.out.println(age1);
    		System.out.println(age2);
    	}