4、Ognl实验

package test;

import java.util.ArrayList;
import java.util.HashMap;

import org.junit.Test;

import ognl.Ognl;
import ognl.OgnlException;
import tcx.model.Department;
import tcx.model.Role;
import tcx.model.User;

public class testOgnl {

    @Test
    public void test() {
        try {
            User u = new User("1", "naruto", "鸣人");
            Department dep = new Department("火之国");
            u.setDep(dep);
            User u2 = new User("2", "sasuke", "佐助", dep);
            User u3 = new User("3", "Itachi", "鼬", dep);

            System.out.println(Ognl.getValue("id", u));
            System.out.println(Ognl.getValue("username", u));
            System.out.println(Ognl.getValue("nickname", u));
            System.out.println(Ognl.getValue("dep.name", u));
            System.out.println(">>>>>>------------------------------>>>>>>>>>");

            ArrayList<User> users = new ArrayList<>();
            users.add(u);
            users.add(u2);
            users.add(u3);
            for (User k : users) {
                System.out.println(k.getId());
                System.out.println(k.getUsername());
                System.out.println(k.getNickname());
                System.out.println(k.getDep().getName());
                System.out.println("------------------------------>>>>>>>>>");
            }
        } catch (OgnlException e) {
            e.printStackTrace();
        }
    }

    @Test
    public void test1() {
        try {
            User u = new User("1", "naruto", "鸣人");
            Department dep = new Department("火之国");
            u.setDep(dep);
            User u2 = new User("2", "sasuke", "佐助", dep);
            User u3 = new User("3", "Itachi", "鼬", dep);
            Role role = new Role("1", "wukong", "孙悟空");
            HashMap<String, Object> context = new HashMap<String, Object>();
            context.put("u", u);
            context.put("u2", u2);
            context.put("u3", u3);
            context.put("role", role);
            // 以下表达式是在root中找，u是root。
            System.out.println(Ognl.getValue("id", context, u));
            System.out.println(Ognl.getValue("username", context, u));
            System.out.println(Ognl.getValue("nickname", context, u));
            System.out.println(Ognl.getValue("dep.name", context, u));
            // 以下表达式是在context这个map中查找，和root无关，root是u。
            System.out.println(Ognl.getValue("#role.username", context, u));
            // root为context不加#可以取到值。
            System.out.println(Ognl.getValue("role.username", context, context));
            // Ognl是一个大的Context，根的key是root，所以可以通过#root.xx取值
            System.out.println(Ognl.getValue("#root.username", context, role));

        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    @Test
    public void test2() {
        try {
            User u = new User("1", "naruto", "鸣人");
            Department dep = new Department("火之国");
            u.setDep(dep);
            User u2 = new User("2", "sasuke", "佐助", dep);
            User u3 = new User("3", "Itachi", "鼬", dep);
            ArrayList<User> users = new ArrayList<>();

            users.add(u);
            users.add(u2);
            users.add(u3);
            // 取list中的元素，通过#root[index].xx。
            System.out.println(Ognl.getValue("#root[0].id", users));
            System.out.println(Ognl.getValue("#root[0].username", users));
            System.out.println(Ognl.getValue("#root[0].dep.name", users));
            System.out.println(Ognl.getValue("#root[1].id", users));
            System.out.println(Ognl.getValue("#root[1].username", users));
            System.out.println(Ognl.getValue("#root[1].dep.name", users));
            System.out.println(Ognl.getValue("#root[2].id", users));
            System.out.println(Ognl.getValue("#root[2].username", users));
            System.out.println(Ognl.getValue("#root[2].dep.name", users));

        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    @Test
    public void test3() {
        try {
            User u = new User("1", "naruto", "鸣人");
            Department dep = new Department("火之国");
            u.setDep(dep);
            User u2 = new User("2", "sasuke", "佐助", dep);
            User u3 = new User("3", "Itachi", "鼬", dep);
            ArrayList<User> users = new ArrayList<>();

            users.add(u);
            users.add(u2);
            users.add(u3);
            // ognl完成方法的调用。
            System.out.println(Ognl.getValue("#root[0].sum(1,100)", users));
            System.out.println(Ognl.getValue("#root[1].hello(123)", users));
            System.out.println(Ognl.getValue("hello('困')", u));
            // 可以通过调用list中的get()方法获取某个下标的对象，然后完成导航。
            System.out.println(Ognl.getValue("get(0).username", users));
        } catch (OgnlException e) {
            e.printStackTrace();
        }
    }

}

用到的类User，Role，Department

package tcx.model;

public class User {
    private String id;
    private String username;
    private String nickname;
    private Department dep;
    public String getId() {
        return id;
    }
    public void setId(String id) {
        this.id = id;
    }
    public String getUsername() {
        return username;
    }
    public void setUsername(String username) {
        this.username = username;
    }
    public String getNickname() {
        return nickname;
    }
    public void setNickname(String nickname) {
        this.nickname = nickname;
    }
    public Department getDep() {
        return dep;
    }
    public void setDep(Department dep) {
        this.dep = dep;
    }
    public User(String id, String username, String nickname) {
        super();
        this.id = id;
        this.username = username;
        this.nickname = nickname;
    }
    
    public User(String id, String username, String nickname, Department dep) {
        super();
        this.id = id;
        this.username = username;
        this.nickname = nickname;
        this.dep = dep;
    }
    @Override
    public String toString() {
        return "User [id=" + id + ", username=" + username + ", nickname=" + nickname + "]";
    }
    public int sum(int a,int b) {
        return a+b;
    }
    public String hello(String h) {
        return h+"中国dota乙烷";
    }
    
}

package tcx.model;

public class Department {
    private String name;

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public Department(String name) {
        super();
        this.name = name;
    }
    
    
}

package tcx.model;

public class Role {
    private String id;
    private String username;
    private String nickname;

    public String getId() {
        return id;
    }

    public void setId(String id) {
        this.id = id;
    }

    public String getUsername() {
        return username;
    }

    public void setUsername(String username) {
        this.username = username;
    }

    public String getNickname() {
        return nickname;
    }

    public void setNickname(String nickname) {
        this.nickname = nickname;
    }

    public Role(String id, String username, String nickname) {
        super();
        this.id = id;
        this.username = username;
        this.nickname = nickname;
    }
    
}

 从根下取值不需要加#号

从context下取值需要加#号

根的结构

u

--id

--username

--nickname

--dep

  --name

context结构

context

--u

--u1

--u2

--u3