BeanUtils工具的使用

beanutils的下載地址：http://commons.apache.org/proper/commons-beanutils/download_beanutils.cgi

 

該壓縮包有測試的代碼：

 

我們就使用其中一個來作為測試使用

 

接下來就對beanutils進行測試：

數據模型 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中主要的類是BeanUtils,如圖：

 

 BeanUtils類的作用：把一個Map集合內的數據進行組裝到一個Javabean中，Javabean指的就是數據模型

運行時出現的錯誤：

 

說明還需要下載一個logging的包，是一個作為輸出的包

下載地址：http://commons.apache.org/proper/commons-logging/download_logging.cgi

 

 加入該包

 

數據模型user.java沒有進行重寫方法出現的結果：

進行重寫了之后：

第一行顯示結果表示沒有使用BeanUtils，第二行是使用了BeanUtils出現的結果：

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：寫的屬性一定得需與數據模型中的相同，要不然會出現不能對應的錯誤，因為它找不到所需的屬性。