利用反射将一个对象的值转存到另一对象

女爷i 2022-06-15 03:52 223阅读 0赞

工作要求，要将存储在原对象中的值部分转存到另一对象，没有利用反射前的代码为：

public NewLCContTable replace(LCContTable mLcContTable){
    		NewLCContTable newlc=new NewLCContTable();
    		newlc.setAgentCode(mLcContTable.getAgentCode());
    		newlc.setAgentCom(mLcContTable.getAgentCom());
    		newlc.setCInValiDate(mLcContTable.getCInValiDate());
    		newlc.setCInValiTime(mLcContTable.getCInValiTime());
    		newlc.setContNo(mLcContTable.getContNo());
    		newlc.setCValiDate(mLcContTable.getCInValiDate());
    		newlc.setCValiTime(mLcContTable.getCInValiTime());
    		newlc.setManageCom(mLcContTable.getManageCom());
    		newlc.setPayIntv(mLcContTable.getPayIntv());
    		newlc.setPayMode(mLcContTable.getPayMode());
    		newlc.setPolApplyDate(mLcContTable.getPolApplyDate());
    		newlc.setPrtNo(mLcContTable.getPrtNo());
    		newlc.setSaleChnl(mLcContTable.getSaleChnl());
    		
    		
    		
    		return newlc;
    		
    	}

利用反射节省了set get重复书写：

public class Clone {
    	public static void main(String[] args) {
    		
    		LCContSchema lcContSchema=new LCContSchema();
    		lcContSchema.setPrtNo("00000");
    		lcContSchema.setContNo("123456");
    		LCPolSchema lcPolSchema=new LCPolSchema();
    		lcPolSchema.setOperator("123");
    		clone(lcContSchema, lcPolSchema);		
    		System.out.println(lcPolSchema.getPrtNo());
    		System.out.println(lcPolSchema.getContNo());
    		System.out.println(lcPolSchema.getOperator());
    		System.out.println(lcContSchema.getOperator());
    		System.out.println(lcPolSchema);
    	}
    	public static Object clone(Object old,Object news){
    		Object o1=news;
    		Method [] m1=news.getClass().getMethods();
    		for(Method m:m1){
    			String methodname=m.getName();
    			
    			if(methodname.indexOf("set")!=-1){
    				String name=methodname.replaceAll("set", "get");
    				Method m2=null;
    				try {
    					m2=old.getClass().getMethod(name, null);
    				} catch (SecurityException e) {					
    					e.printStackTrace();
    				} catch (NoSuchMethodException e) {
    					continue;					
    				}				
    				System.out.println(m.getName());
    				System.out.println("old:"+m2.getName());
    				try {
    					Object o2= m2.invoke(old, null);
    					System.out.println(o2!=null);
    					if(o2!=null){
    						m.invoke(news, m2.invoke(old, null));
    					}
    					
    				} catch (Exception e) {					
    					continue;
    				} 
    			
    			}
    		}
    		
    		
    		
    		return o1;
    	}
    }

05-27

开了下api修改了下代码

/**
    	 * 
    	 * @param a  news
    	 * @param b  old
    	 * @return
    	 */
    	 public static Object transFields(Object a, Object b)
    	    {
    	        Class c1 = a.getClass();
    	        Class c2 = b.getClass();
    
    	        Field[] fieldsDest = c1.getDeclaredFields();
    	        Field[] fieldsOrg = c2.getDeclaredFields();
    
    	        AccessibleObject.setAccessible(fieldsDest, true); //取消访问控制检查
    	        AccessibleObject.setAccessible(fieldsOrg, true);
    
    	        for (int i = 0; i < fieldsDest.length; i++)
    	        {
    	            Field f = fieldsDest[i];
    	            Class type = f.getType();
    	            String name = f.getName();
    	            String typeName = type.getName();
    	            System.out.println("name:"+name);
    	            System.out.println("typename:"+typeName);
    	            
    	            if (name.equals("FIELDNUM") || name.equals("PK") ||
    	                name.equals("mErrors") || name.equals("fDate"))
    	            {
    	                continue;
    	            }	           
    	            for (int j = 0; j < fieldsOrg.length; j++)
    	            {
    	                //得到数据源的数据
    	                Field f1 = fieldsOrg[j];
    	                Class type1 = f1.getType();
    	                String name1 = f1.getName();
    	                String typeName1 = type.getName();
    	                System.out.println("name1:"+name);
    		            System.out.println("typename1:"+typeName);
    
    	                if (name.equals("FIELDNUM") || name.equals("PK") ||
    	                    name.equals("mErrors") || name.equals("fDate"))
    	                {
    	                    continue;
    	                }
    	                //赋值转换
    	                if ((typeName.equals(typeName1)) && (name1.equals(name)))
    	                {
    
    	                    switch (transType(typeName))
    	                    {
    	                        case 3:
    	                            try
    	                            {
    	                                f.setDouble(a, f1.getDouble(b));
    	                                
    	                            }
    	                            catch (Exception e)
    	                            {
    	                                e.printStackTrace();
    	                            }
    	                            break
    	                                    ;
    	                        case 5:
    	                            try
    	                            {
    	                                f.setInt(a, f1.getInt(b));
    	                               
    	                            }
    	                            catch (Exception e)
    	                            {
    	                                e.printStackTrace();
    	                            }
    	                            break
    	                                    ;
    	                        case 93:
    	                            try
    	                            {
    	                                f.set(a, f1.get(b));	                                
    	                            }
    	                            catch (Exception e)
    	                            {
    	                                e.printStackTrace();
    	                            }
    	                            break
    	                                    ;
    	                        default:
    	                            try
    	                            {
    	                                f.set(a, f1.get(b));
    	                                
    	                            }
    	                            catch (Exception e)
    	                            {
    	                                e.printStackTrace();
    	                            }
    	                            }
    	                                    break;
    	                    }
    	                }
    
    	            }
    
    	            return a;
    	        }
    	  private static int transType(Object type)
          {
              int typecode;
              typecode = 93;
              if (type.equals("java.lang.String"))
              {
                  typecode = 93;
              }
              if (type.equals("double"))
              {
                  typecode = 3;
              }
              if (type.equals("int"))
              {
                  typecode = 5;
              }
    
              return typecode;
          }