java 反射 比较两个对象 把不同值的字段返回给前段_JAVA_编程开发_程序员俱乐部

1、比较类

class="java">package com.test.classreflection;

import java.lang.reflect.Method;
import java.util.ArrayList;
import java.util.List;
/**
 * 比较类
 * @author LIUHE524
 *
 */
public class ClassAttrValCompare {
	
	private DifferenceAttr differenceAttr;
	
	public ClassAttrValCompare() {
		differenceAttr = new DifferenceAttr();
	}
	/**
	 * 比较单个值
	 * @param objA
	 * @return
	 */
	public DifferenceAttr compareValue(Object objA) {
		DifferenceAttr differAttr = new DifferenceAttr();
		try{			
			List<String> differenceAttrs = new ArrayList<String>();
			List<DifferenceAttr> childDifferenceAttr = new ArrayList<DifferenceAttr>();
			Class<?> clazzA = objA.getClass();
			Method[] methods = clazzA.getDeclaredMethods();
			Object result = null;
			for(Method method:methods) {
				if(method.getName().startsWith("get")) {
					result = method.invoke(objA, null);
					if(result==null) {
						continue;
					}
					if(result instanceof List) {
						List<Object> childList = (List)result;
						for(Object object:childList) {
							childDifferenceAttr.add(compareValue(object));
						}
					}else {
						String nameTrim = method.getName().substring(3);
						nameTrim = nameTrim.substring(0,1).toLowerCase()+nameTrim.substring(1);
						differenceAttrs.add(nameTrim);
					}
				}
			}
			differAttr.setDifferenceAttrs(differenceAttrs);
			differAttr.setChildrenDifference(childDifferenceAttr);
		}catch(Exception e) {
			e.printStackTrace();
		}
		return differAttr;
	}
    /**
     * 两个对象值的对比（objA为对比）
     * @param objA
     * @param objB
     * @return
     */
	public DifferenceAttr compareValue(Object objA,Object objB) {
		DifferenceAttr differenceAttr = new DifferenceAttr();
		//值都为空，则返回
		if(objA==null&&objB==null) {
			return null;
		}
		//objA不为空，objB为空,则把返回objA所有字段
		if(objA!=null&&objB==null) {
			return compareValue(objA);
		}
		//当前类差异集合
		List<String> differenceAttrs = new ArrayList<String>();
		//子集合查询集合
		List<DifferenceAttr> childrenDifference = new ArrayList<DifferenceAttr>();
		
		try {
			Class<?> clazzA = objA.getClass();
			Class<?> clazzB = objB.getClass();
			Method[] methods = clazzA.getDeclaredMethods();
			Object resultA = null;
			Object resultB = null;
			Method methodB = null;
			for(Method method:methods) {
				if(method.getName().startsWith("get")) {				
					methodB = clazzB.getMethod(method.getName(), null);
					resultB = methodB.invoke(objB, null);
					resultA = method.invoke(objA, null);
					if(resultA==null&&resultB==null) {
						continue;
					}
					
					if(resultA==null&&resultB!=null) {
						differenceAttrs.add(method.getName());						
					}else if(resultA!=null&&resultB==null) {
						differenceAttrs.add(method.getName());
					}else {
						
						if(!(resultA instanceof List)) {
							if(!resultA.equals(resultB)) {
								String nameTrim = method.getName().substring(3);
								nameTrim = nameTrim.substring(0,1).toLowerCase()+nameTrim.substring(1);
								differenceAttrs.add(nameTrim);
							}
						}else {
							List<Object> listA = (List<Object>)resultA;
							List<Object> listB = (List<Object>)resultB;
							
							for(int i=0;i<listA.size();i++) {
								DifferenceAttr childAttr = null;
								if(i>=listB.size()) {
									 childAttr = compareValue(listA.get(i), null);
								}else {
									 childAttr = compareValue(listA.get(i), listB.get(i));
								}
								childrenDifference.add(childAttr);
							}
						}
					}
					differenceAttr.setChildrenDifference(childrenDifference);
					differenceAttr.setDifferenceAttrs(differenceAttrs);
				}
			}
		}catch(Exception e) {
			e.printStackTrace();
		}
		return differenceAttr;
	}
	//比较返回的类
	public class DifferenceAttr{
		private List<String> differenceAttrs;
		private List<DifferenceAttr> childrenDifference;
		
		public List<String> getDifferenceAttrs() {
			return differenceAttrs;
		}
		public void setDifferenceAttrs(List<String> differenceAttrs) {
			this.differenceAttrs = differenceAttrs;
		}
		public List<DifferenceAttr> getChildrenDifference() {
			return childrenDifference;
		}
		public void setChildrenDifference(List<DifferenceAttr> childrenDifference) {
			this.childrenDifference = childrenDifference;
		}
	}
	public DifferenceAttr getDifferenceAttr() {
		return differenceAttr;
	}
	public void setDifferenceAttr(DifferenceAttr differenceAttr) {
		this.differenceAttr = differenceAttr;
	}

	public static void main(String[] args) {
		ClassAttrValCompare attrCompare = new ClassAttrValCompare();
		
		ObjectTest object1 = new ObjectTest();
		object1.setMessage("这是个测试信息1");
		object1.setReturnFlag("Y");
		object1.setVisible("Y");
		object1.setNumber(1);
		
		List<ChildObject> childList1 = new ArrayList<ChildObject>();
		ChildObject child1_1 = new ChildObject();
		child1_1.setAddress("测试地址1_1");
		child1_1.setChildName("测试姓名");
		child1_1.setChildValue("测试值1_1");
		
		ChildObject child1_2 = new ChildObject();
		child1_2.setAddress("测试地址1_2");
		child1_2.setChildName("测试姓名");
		child1_2.setChildValue("测试值1_2");
		
		childList1.add(child1_1);
		childList1.add(child1_2);
		object1.setList(childList1);
		
		ObjectTest object2 = new ObjectTest();
		object2.setMessage("这是个测试信息2");
		object2.setReturnFlag("Y");
		object2.setVisible("N");
		object2.setNumber(2);
		
		List<ChildObject> childList2 = new ArrayList<ChildObject>();
		ChildObject child2_1 = new ChildObject();
		child2_1.setAddress("测试地址2_1");
		child2_1.setChildName("测试姓名");
		child2_1.setChildValue("测试值2_1");
		
		ChildObject child2_2 = new ChildObject();
		child2_2.setAddress("测试地址2_2");
		child2_2.setChildName("测试姓名");
		child2_2.setChildValue("测试值2_2");
		
		childList2.add(child2_1);
		childList2.add(child2_2);
		object2.setList(childList2);
		
		DifferenceAttr attr = attrCompare.compareValue(object1, object2);
		
		attrCompare.printTrace(attr);
		
	}
	
	public void printTrace(DifferenceAttr attr) {
		System.out.println("*******打印开始********");
		for(String str:attr.getDifferenceAttrs()) {
			System.out.println(str);
		}
		if(attr.getChildrenDifference()!=null) {
			System.out.println("********打印子节点开始*********");
			for(DifferenceAttr tempAttr:attr.getChildrenDifference()) {				
				printTrace(tempAttr);
			}
		}
	}
	
}

?2、ObjectTest类

package com.test.classreflection;

import java.util.List;

public class ObjectTest {
	
	private String message;
	private String returnFlag;
	private String visible;
	private List<ChildObject> list;
	private ChildObject childObject;
	private int number;
	
	public String getMessage() {
		return message;
	}
	public void setMessage(String message) {
		this.message = message;
	}
	public String getReturnFlag() {
		return returnFlag;
	}
	public void setReturnFlag(String returnFlag) {
		this.returnFlag = returnFlag;
	}
	public String getVisible() {
		return visible;
	}
	public void setVisible(String visible) {
		this.visible = visible;
	}
	public List<ChildObject> getList() {
		return list;
	}
	public void setList(List<ChildObject> list) {
		this.list = list;
	}
	public ChildObject getChildObject() {
		return childObject;
	}
	public void setChildObject(ChildObject childObject) {
		this.childObject = childObject;
	}
	public int getNumber() {
		return number;
	}
	public void setNumber(int number) {
		this.number = number;
	}
	
	public static void main(String[] args) {
		String[] clazzTypes = String.class.toString().split("\\.");
		System.out.println(clazzTypes[clazzTypes.length-1]);
		System.out.println(Integer.class);
		System.out.println(Object.class);
		System.out.println(ObjectTest.class);
	}
	
}

?3、ChildObject类

package com.test.classreflection;

import java.util.List;

public class ChildObject {

	private String childName;
	private String childValue;
	private String address;
	private List<ChildObject> childList;
	
	
	public String getChildName() {
		return childName;
	}
	public void setChildName(String childName) {
		this.childName = childName;
	}
	public String getChildValue() {
		return childValue;
	}
	public void setChildValue(String childValue) {
		this.childValue = childValue;
	}
	public String getAddress() {
		return address;
	}
	public void setAddress(String address) {
		this.address = address;
	}
	public List<ChildObject> getChildList() {
		return childList;
	}
	public void setChildList(List<ChildObject> childList) {
		this.childList = childList;
	}
}

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