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  • 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:

     1 package learning_something;
     2 
     3 public class User {
     4     private String username;
     5     private String email;
     6     private String password;
     7     private String name;
     8     private String phone;
     9     private String address;
    10     private boolean isadmin;
    11     private boolean isvalidate;
    12     public String getUsername() {
    13         return username;
    14     }
    15     public void setUsername(String username) {
    16         this.username = username;
    17     }
    18     public String getEmail() {
    19         return email;
    20     }
    21     public void setEmail(String email) {
    22         this.email = email;
    23     }
    24     public String getPassword() {
    25         return password;
    26     }
    27     public void setPassword(String password) {
    28         this.password = password;
    29     }
    30     public String getName() {
    31         return name;
    32     }
    33     public void setName(String name) {
    34         this.name = name;
    35     }
    36     public String getPhone() {
    37         return phone;
    38     }
    39     public void setPhone(String phone) {
    40         this.phone = phone;
    41     }
    42     public String getAddress() {
    43         return address;
    44     }
    45     public void setAddress(String address) {
    46         this.address = address;
    47     }
    48     public boolean isIsadmin() {
    49         return isadmin;
    50     }
    51     public void setIsadmin(boolean isadmin) {
    52         this.isadmin = isadmin;
    53     }
    54     public boolean isIsvalidate() {
    55         return isvalidate;
    56     }
    57     public void setIsvalidate(boolean isvalidate) {
    58         this.isvalidate = isvalidate;
    59     }
    60     public User(String username, String email, String password, String name, String phone, String address,
    61             boolean isadmin, boolean isvalidate) {
    62         super();
    63         this.username = username;
    64         this.email = email;
    65         this.password = password;
    66         this.name = name;
    67         this.phone = phone;
    68         this.address = address;
    69         this.isadmin = isadmin;
    70         this.isvalidate = isvalidate;
    71     }
    72     
    73     
    74     public User(String username, String email, String password, String name, String phone, String address) {
    75         
    76         this.username = username;
    77         this.email = email;
    78         this.password = password;
    79         this.name = name;
    80         this.phone = phone;
    81         this.address = address;
    82         this.isadmin = false;
    83         this.isvalidate = false;
    84     }
    85     public User() {
    86         super();
    87     }
    88     
    89     
    90     
    91     
    92     
    93 
    94 }
    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。

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  • 原文地址:https://www.cnblogs.com/jiguiyan/p/10615751.html
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