Javabean学习纪要

package cn.dl.fanshe;

import java.util.Map;

import org.apache.commons.beanutils.BeanUtils;
import org.junit.Test;

public class CommonTools {
    /*
     * 该方法用来将map中的数据写入javabean中
     * */
    public  static <T> T beanUtil(Map map, Class<T> clazz){
        
        T bean;
        try {
            bean = clazz.newInstance();//实例化javabean类
            BeanUtils.populate(bean, map);//将map中的值写入bean中
            return bean;
        } catch (Exception e) {
            
            throw new RuntimeException(e);
        } 
            
    }
}

//测试类
package cn.dl.fanshe;
import java.util.HashMap;
import java.util.Map;

import org.apache.commons.beanutils.BeanUtils;
import org.junit.Test;

public class TestCommonTools {

    @Test
    public void fun() throws Exception{
        
        Class clazz = Class.forName("cn.dl.fanshe.User");//获取User类
      　Map<String , String> map= new HashMap<String,String>();//创建map
        map.put("username", "张三");//map中的键名要与User类中的属性名一致
        map.put("password", "123456");
        CommonTools ct = new CommonTools();//创建javabean工具类
        System.out.println(ct.beanUtil(map, clazz));//调出工具类中的方法
        
    }
    
}

//User类
package cn.dl.fanshe;

public class User {
    private String username;
    private String password;
    public User() {
        super();
    }
    public String getUsername() {
        return username;
    }
    public void setUsername(String username) {
        this.username = username;
    }
    public String getPassword() {
        return password;
    }
    public void setPassword(String password) {
        this.password = password;
    }
    @Override
    public String toString() {
        return "User [username=" + username + ", password=" + password + "]";
    }
    
    
}