這是一個把Map轉(zhuǎn)為bean的工具

導(dǎo)包

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Bean代碼，Student類

package com.lingaolu.bena;/*** @author 林高祿* @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;}@Overridepublic String toString() {return "Student{" +"name='" + name + '\'' +", age=" + age +", no=" + no +'}';} }

測試類代碼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 林高祿* @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","林大帥");map.put("age",27);map.put("no",111);Student s = new Student();BeanUtils.populate(s,map);System.out.println(s);} }

運行如果輸出

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

下載地址apache的logging包

?解壓

導(dǎo)入項目

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?再次運行輸出：

Student{name='林大帥', age=27, no=111}

我們把測試再代碼改一下

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 林高祿* @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","林大帥");map.put("age","234");map.put("no","111");Student s = new Student();BeanUtils.populate(s,map);System.out.println(s);} }

運行輸出：

Student{name='林大帥', age=27, no=111}

?所以對于數(shù)值來說，字符串或者數(shù)字都行

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