BeanUtils之commons-beanutils

Map转Bean实用技巧

最新推荐文章于 2023-02-28 20:03:55 发布

原创最新推荐文章于 2023-02-28 20:03:55 发布 · 8.5k 阅读

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#JavaBean #BeanUtils

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本文介绍了一种将Map数据结构转换为Java Bean对象的方法，使用Apache Commons BeanUtils库简化转换过程，展示了具体代码实例和常见错误处理。

这是一个把Map转为bean的工具

导包

Bean代码，Student类

package com.lingaolu.bena;

/**
 * @author 林高禄
 * @create 2020-07-08-20:01
 */
public class Student {
    private String name;
    private int age;
    private Integer no;

    public String getName() {
        return name;
    }

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

    public int getAge() {
        return age;
    }

    public void setAge(int age) {
        this.age = age;
    }

    public Integer getNo() {
        return no;
    }

    public void setNo(Integer no) {
        this.no = no;
    }

    @Override
    public String toString() {
        return "Student{" +
                "name='" + name + '\'' +
                ", age=" + age +
                ", no=" + no +
                '}';
    }
}

测试类代码Demo1

package com.lingaolu.test;

import com.lingaolu.bena.Student;
import org.apache.commons.beanutils.BeanUtils;

import java.lang.reflect.InvocationTargetException;
import java.util.HashMap;
import java.util.Map;

/**
 * @author 林高禄
 * @create 2020-07-08-20:03
 */
public class Demo1 {

    public static void main(String[] args) throws InvocationTargetException, IllegalAccessException {
        Map<String,Object> map = new HashMap<>();
        map.put("name","林大帅");
        map.put("age",27);
        map.put("no",111);

        Student s = new Student();
        BeanUtils.populate(s,map);
        System.out.println(s);
    }
}

运行如果输出

Exception in thread "main" java.lang.NoClassDefFoundError: org/apache/commons/logging/LogFactory
   at org.apache.commons.beanutils.ConvertUtilsBean.<init>(ConvertUtilsBean.java:157)
   at org.apache.commons.beanutils.BeanUtilsBean.<init>(BeanUtilsBean.java:117)
   at org.apache.commons.beanutils.BeanUtilsBean$1.initialValue(BeanUtilsBean.java:68)
   at org.apache.commons.beanutils.ContextClassLoaderLocal.get(ContextClassLoaderLocal.java:153)
   at org.apache.commons.beanutils.BeanUtilsBean.getInstance(BeanUtilsBean.java:80)
   at org.apache.commons.beanutils.BeanUtils.populate(BeanUtils.java:433)
   at com.lingaolu.test.Demo1.main(Demo1.java:23)
Caused by: java.lang.ClassNotFoundException: org.apache.commons.logging.LogFactory
   at java.net.URLClassLoader.findClass(URLClassLoader.java:381)
   at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
   at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:331)
   at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
   ... 7 more

缺少了 org/apache/commons/logging包

下载地址apache的logging包

解压

导入项目

再次运行输出：

Student{name='林大帅', age=27, no=111}

我们把测试再代码改一下

package com.lingaolu.test;

import com.lingaolu.bena.Student;
import org.apache.commons.beanutils.BeanUtils;

import java.lang.reflect.InvocationTargetException;
import java.util.HashMap;
import java.util.Map;

/**
 * @author 林高禄
 * @create 2020-07-08-20:03
 */
public class Demo1 {

    public static void main(String[] args) throws InvocationTargetException, IllegalAccessException {
        Map<String,Object> map = new HashMap<>();
        map.put("name","林大帅");
        map.put("age","234");
        map.put("no","111");

        Student s = new Student();
        BeanUtils.populate(s,map);
        System.out.println(s);
    }
}