Java反射通过Getter方法获取对象VO的属性值过程解析

为了代码清楚些，将一些工具方法独立一下，如field name到getter name的转换方法

GetterUtil

package com.nicchagil.util.fields;

public class GetterUtil {
  
  /**
   * Get getter method name by field name
   * @param fieldname
   * @return
   */
  public static String toGetter(String fieldname) {
    
    if (fieldname == null || fieldname.length() == 0) {
      return null;
    }
    
    /* If the second char is upper, make 'get' + field name as getter name. For example, eBlog -> geteBlog */
    if (fieldname.length() > 2) {
      String second = fieldname.substring(1, 2);
      if (second.equals(second.toUpperCase())) {
        return new StringBuffer("get").append(fieldname).toString();
      }
    }
    
    /* Common situation */
    fieldname = new StringBuffer("get").append(fieldname.substring(0, 1).toUpperCase())
        .append(fieldname.substring(1)).toString();
    
    return fieldname;
  }

}

大功告成！！！

现在，写个VO作为模拟数据

User

import java.util.Date;

public class User {

  private String username;
  private String password;
  private String eBlog;
  private Date registrationDate;
  
  public String getUsername() {
    return username;
  }

  public void setUsername(String username) {
    this.username = username;
  }

  public String getPassword() {
    return password;
  }

  public void setPassword(String password) {
    this.password = password;
  }

  public String geteBlog() {
    return eBlog;
  }

  public void seteBlog(String eBlog) {
    this.eBlog = eBlog;
  }

  public Date getRegistrationDate() {
    return registrationDate;
  }

  public void setRegistrationDate(Date registrationDate) {
    this.registrationDate = registrationDate;
  }

}

最后，测试类，此类将直接调用FieldsCollector~~

Call

import java.util.Date;
import java.util.Map;

import com.nicchagil.util.fields.FieldEntity;
import com.nicchagil.util.fields.FieldsCollector;



public class Call {
  
  public static void main(String[] args) throws Exception {
    
    User user = new User();
    user.setUsername("user109");
    user.setPassword("pwd109");
    user.seteBlog("http://www.cnblogs.com/nick-huang/");
    user.setRegistrationDate(new Date());
    
    Map<String, FieldEntity> map = FieldsCollector.getFileds(user);
    System.out.println(map);
    
  }

}

Oh year， 成功了~~~

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持易采站长站。