BeanUtils工具的使用

beanutils的下载地址：http://commons.apache.org/proper/commons-beanutils/download_beanutils.cgi

该压缩包有测试的代码：

我们就使用其中一个来作为测试使用

接下来就对beanutils进行测试：

数据模型 user.java：

 package learning_something;

 public class User {
     private String username;
     private String email;
     private String password;
     private String name;
     private String phone;
     private String address;
     private boolean isadmin;
     private boolean isvalidate;
     public String getUsername() {
         return username;
     }
     public void setUsername(String username) {
         this.username = username;
     }
     public String getEmail() {
         return email;
     }
     public void setEmail(String email) {
         this.email = email;
     }
     public String getPassword() {
         return password;
     }
     public void setPassword(String password) {
         this.password = password;
     }
     public String getName() {
         return name;
     }
     public void setName(String name) {
         this.name = name;
     }
     public String getPhone() {
         return phone;
     }
     public void setPhone(String phone) {
         this.phone = phone;
     }
     public String getAddress() {
         return address;
     }
     public void setAddress(String address) {
         this.address = address;
     }
     public boolean isIsadmin() {
         return isadmin;
     }
     public void setIsadmin(boolean isadmin) {
         this.isadmin = isadmin;
     }
     public boolean isIsvalidate() {
         return isvalidate;
     }
     public void setIsvalidate(boolean isvalidate) {
         this.isvalidate = isvalidate;
     }
     public User(String username, String email, String password, String name, String phone, String address,
             boolean isadmin, boolean isvalidate) {
         super();
         this.username = username;
         this.email = email;
         this.password = password;
         this.name = name;
         this.phone = phone;
         this.address = address;
         this.isadmin = isadmin;
         this.isvalidate = isvalidate;
     }

     public User(String username, String email, String password, String name, String phone, String address) {

         this.username = username;
         this.email = email;
         this.password = password;
         this.name = name;
         this.phone = phone;
         this.address = address;
         this.isadmin = false;
         this.isvalidate = false;
     }
     public User() {
         super();
     }

 }

user.java

bean中主要的类是BeanUtils,如图：

BeanUtils类的作用：把一个Map集合内的数据进行组装到一个Javabean中，Javabean指的就是数据模型

运行时出现的错误：

说明还需要下载一个logging的包，是一个作为输出的包

下载地址：http://commons.apache.org/proper/commons-logging/download_logging.cgi

加入该包

数据模型user.java没有进行重写方法出现的结果：

进行重写了之后：

第一行显示结果表示没有使用BeanUtils，第二行是使用了BeanUtils出现的结果：

package learning_something;

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

import org.apache.commons.beanutils.BeanUtils;

public class TestBeanUtils {

    public static void main(String[] args) throws Exception  {
        Map<String,Object> map=new HashMap<String,Object>();
        map.put("username", "perfect");
        map.put("email", "jiguiyan1998@qq.com");
        map.put("password", "123");

        User u=new User();
        System.out.println(u);
        BeanUtils.copyProperties(u, map);
        System.out.println(u);
    }

}

注意：写的属性一定得需与数据模型中的相同，要不然会出现不能对应的错误，因为它找不到所需的属性。