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();
    }
    
    
    
    
    

}

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", "[e-mail]");
        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。