实现效果1：

 

实现效果2：

代码：

类1：

package astTest;

import java.io.BufferedInputStream;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;

import org.eclipse.core.runtime.CoreException;
import org.eclipse.core.runtime.IProgressMonitor;
import org.eclipse.jdt.core.ICompilationUnit;
import org.eclipse.jdt.core.JavaModelException;
import org.eclipse.jdt.core.dom.AST;
import org.eclipse.jdt.core.dom.ASTParser;
import org.eclipse.jdt.core.dom.CompilationUnit;
import org.eclipse.jdt.core.dom.rewrite.ASTRewrite;
import org.eclipse.jdt.core.dom.rewrite.ImportRewrite;
import org.eclipse.jface.text.BadLocationException;
import org.eclipse.jface.text.Document;
import org.eclipse.text.edits.TextEdit;

import refactoring.test.test004;

public class MainDo {

	public MainDo(String path) throws FileNotFoundException, IOException {
		CompilationUnit comp = getCompilationUnit(path);

		// DemoVisitor visitor = new DemoVisitor();
		// comp.accept(visitor);
		IfTransformer IfTransformer = new IfTransformer();
		comp.accept(IfTransformer);
		InstanceOfRefactor instanceOfRefactor = new InstanceOfRefactor();
		comp.accept(instanceOfRefactor);	
		
		test004.saveFile(comp.toString(), path);
	}

	public static void main(String[] args) throws FileNotFoundException, IOException {
		System.out.println("begin");
		MainDo DemoVisitorTest = new MainDo(
				"D:\\work\\workWithKingdee\\development\\yfcosmic\\"
				+ "bos-dev-tool\\workspaceNew\\refactoringTest\\src\\astTest\\ChangeDemo01.java");
		MainDo DemoVisitorTest2 = new MainDo(
				"D:\\work\\workWithKingdee\\development\\yfcosmic\\"
				+ "bos-dev-tool\\workspaceNew\\refactoringTest\\src\\astTest\\ChangeDemo02.java");

		System.out.println("end");
	}
	/**
	 * get compilation unit of source code
	 * 
	 * @param javaFilePath
	 * @return CompilationUnit
	 */
	public static CompilationUnit getCompilationUnit(String javaFilePath) {
		byte[] input = null;
		try {
			BufferedInputStream bufferedInputStream = new BufferedInputStream(new FileInputStream(javaFilePath));
			input = new byte[bufferedInputStream.available()];
			bufferedInputStream.read(input);
			bufferedInputStream.close();
		} catch (FileNotFoundException e) {
			e.printStackTrace();
		} catch (IOException e) {
			e.printStackTrace();
		}

		ASTParser astParser = ASTParser.newParser(AST.JLS8);
		astParser.setSource(new String(input).toCharArray());
		astParser.setKind(ASTParser.K_COMPILATION_UNIT);

		CompilationUnit result = (CompilationUnit) (astParser.createAST(null));

		return result;
	}

}

类2：

package astTest;
import java.util.ArrayList;
import java.util.List;

import org.eclipse.jdt.core.dom.AST;
import org.eclipse.jdt.core.dom.ASTNode;
import org.eclipse.jdt.core.dom.ASTVisitor;
import org.eclipse.jdt.core.dom.Block;
import org.eclipse.jdt.core.dom.Expression;
import org.eclipse.jdt.core.dom.ExpressionStatement;
import org.eclipse.jdt.core.dom.IfStatement;
import org.eclipse.jdt.core.dom.InfixExpression;
import org.eclipse.jdt.core.dom.InfixExpression.Operator;


import org.eclipse.jdt.core.dom.MethodInvocation;
import org.eclipse.jdt.core.dom.QualifiedName;
import org.eclipse.jdt.core.dom.SimpleName;
import org.eclipse.jdt.core.dom.Statement;
import org.eclipse.jdt.core.dom.StringLiteral;
 
public class IfTransformer extends ASTVisitor {

	List<ASTNode> functionPartUpper=new ArrayList<>();
	List<ASTNode> upper=new ArrayList<>();
	List<ASTNode> center=new ArrayList<>();
	List<ASTNode> tail=new ArrayList<>();
	List<ASTNode> functionPartTail=new ArrayList<>();

	Expression  childExression=null;
	Expression  parentExression=null;

	@Override
	public boolean visit(IfStatement node) {
		{
			Statement then=node.getThenStatement();
			Block block=(Block)then;
			List<Statement> child=block.statements();
			System.out.println(child);
			boolean isTail=false;
			//提取if内的内容，按照前中后组合
			isTail = getStatementsToList(node, child, isTail);
			//判断是否符合重构条件
			if (childExression==null) {
				return false;
			}
			
			//[modify by changxiaosong for 保存父类的上下部分的内容，防止被覆盖 at 2021年11月24日 begin
			Block funcBlock = saveIfUpperAndTail(node,functionPartUpper,functionPartTail);

			//modify   by changxiaosong  at 2021年11月24日 end]
			
			
			//拼接代码块，放入if中
			//上面if
			IfStatement blockNewIfUpper = gatherUpperIf(node);
			/*
			Block blockNew = node.getAST().newBlock();
			blockNew.statements().add((Statement)ASTNode.copySubtree(node.getAST(),  upper.get(0)));
			node.setThenStatement(blockNew);*/
			//中间if
			IfStatement blockNewIfCenter = gatherCenterIf(node);
			
			//下面if
			IfStatement blockNewIfLow = gatherTailIf(node);
			//拼接上中下
			
			gatherAllNewStatements(node, funcBlock, blockNewIfUpper, blockNewIfCenter, blockNewIfLow);
			childExression=null;
		}
 
		return false;
	}

	public IfStatement gatherTailIf(IfStatement node) {
		IfStatement blockNewIfLow = node.getAST().newIfStatement();
		blockNewIfLow.setExpression((Expression)copyBlock(node,parentExression));
		Block blockTail= arrayToBlock(node,tail);
		blockNewIfLow.setThenStatement(blockTail);
		return blockNewIfLow;
	}

	public IfStatement gatherCenterIf(IfStatement node) {
		IfStatement blockNewIfCenter = node.getAST().newIfStatement();
		//拼接条件
		InfixExpression expression = node.getAST().newInfixExpression();
		expression.setLeftOperand((Expression)ASTNode.copySubtree(node.getAST(),  node.getExpression()));
		expression.setOperator(Operator.CONDITIONAL_AND);
		expression.setRightOperand((Expression)copyBlock(node,childExression));
		blockNewIfCenter.setExpression((Expression)copyBlock(node,expression));
		Block blockNewCenter = arrayToBlock(node,center);
		blockNewIfCenter.setThenStatement(blockNewCenter);
		return blockNewIfCenter;
	}

	public IfStatement gatherUpperIf(IfStatement node) {
		IfStatement blockNewIfUpper = node.getAST().newIfStatement();
		blockNewIfUpper.setExpression((Expression)ASTNode.copySubtree(node.getAST(),  parentExression));
		Block blockNewUpper = arrayToBlock(node,upper);
		blockNewIfUpper.setThenStatement(blockNewUpper);
		return blockNewIfUpper;
	}

	public void gatherAllNewStatements(IfStatement node, Block funcBlock, IfStatement blockNewIfUpper,
			IfStatement blockNewIfCenter, IfStatement blockNewIfLow) {
		funcBlock.statements().clear();
		//原来的头
		arrayAddToStatements(node,functionPartUpper,funcBlock.statements());
		//拆分的三个if条件
		funcBlock.statements().add(blockNewIfUpper);
		funcBlock.statements().add(blockNewIfCenter);
		funcBlock.statements().add(blockNewIfLow);
		//原来的尾巴 
		arrayAddToStatements(node,functionPartTail,funcBlock.statements());
	}

	public boolean getStatementsToList(IfStatement node, List<Statement> child, boolean isTail) {
		for (Statement object : child) {
			if (object instanceof IfStatement) {
				IfStatement childIf=(IfStatement)object;
				Statement childIfStatement=childIf.getThenStatement();
				parentExression=node.getExpression();
				childExression=childIf.getExpression();
				center.add(childIfStatement);
				isTail=true;
			}else {
				if (isTail) {
					tail.add(object);
				}else {
					upper.add(object);
				}
			}
		}
		return isTail;
	}

	public Block saveIfUpperAndTail(IfStatement node,List<ASTNode> functionPartUpper,List<ASTNode> functionPartTail) {
		return Tool.saveIfUpperAndTail(node, functionPartUpper, functionPartTail);
	}

	public ASTNode copyBlock(IfStatement node,Expression childExression) {
		return Tool.copyBlock(node, childExression);
	}

	public ASTNode copyBlock(IfStatement node, Statement sentenceOne) {
		return Tool.copyBlock(node, childExression);
	}

	public Block arrayToBlock(IfStatement node,List<ASTNode> upper) {
		Block blockNewUpper = node.getAST().newBlock();
		for (ASTNode nodeTmp : upper) {
			blockNewUpper.statements().add((Statement)ASTNode.copySubtree(node.getAST(),  nodeTmp));
		}
		return blockNewUpper;
	}
	public void arrayAddToStatements(IfStatement node,List<ASTNode> upper,List  statements) {
		Tool.arrayAddToStatements(node, upper, statements);
	}
	public boolean visitOrg(IfStatement node) {
		/**
		 * fragment != null
		 */
		InfixExpression ie = (InfixExpression)node.getExpression();
		ie.setOperator(Operator.NOT_EQUALS);
		{
			Statement then=node.getThenStatement();
			Block block=(Block)then;
			List child=block.statements();
			
			
		}
		
		/**
		 * if (fragment == null) {
		 *	  System.out.println("Wrong!");
		 * }
		 * else {
		 *    System.out.println("Wrong!");
		 * }
		 */
		node.setElseStatement(
				(Block) ASTNode.copySubtree(node.getAST(),  node.getThenStatement()));
 
		/**
		 * if (fragment == null) {
		 *	  System.out.println("Done!");
		 * }
		 * else {
		 *    System.out.println("Wrong!");
		 * }
		 */
		AST ast = node.getAST();
		
		MethodInvocation methodInv = ast.newMethodInvocation();
 
		SimpleName nameSystem = ast.newSimpleName("System");
		SimpleName nameOut = ast.newSimpleName("out");
		SimpleName namePrintln = ast.newSimpleName("println");
 
		//连接‘System’和‘out’
		//System.out
		QualifiedName nameSystemOut = ast.newQualifiedName(nameSystem, nameOut);
 
		//连接‘System.out’和‘println’到MethodInvocation节点
		//System.out.println()
		methodInv.setExpression(nameSystemOut);
		methodInv.setName(namePrintln);
 
		//"Done!"
		StringLiteral sDone = ast.newStringLiteral();
		sDone.setEscapedValue("\"Done!\"");
 
		//System.out.println("Done!")
		methodInv.arguments().add(sDone);
 
		//将方法调用节点MethodInvocation连接为表达式语句ExpressionStatement的子节点
		//System.out.println("Done!");
		ExpressionStatement es = ast.newExpressionStatement(methodInv);
		
		//将表达式语句连接为新建语句块节点Block的子节点
		//{
		//System.out.println("Done!");
		//}
		Block block = ast.newBlock();
		block.statements().add(es);
		MethodInvocation methodInv2 = ast.newMethodInvocation();
		SimpleName nameSystem2 = ast.newSimpleName("System");
		SimpleName nameOut2 = ast.newSimpleName("out");
		SimpleName namePrintln2 = ast.newSimpleName("println");
		QualifiedName nameSystemOut2 = ast.newQualifiedName(nameSystem2, nameOut2);

		methodInv2.setExpression(nameSystemOut2);
		methodInv2.setName(namePrintln2);
		StringLiteral sDone2 = ast.newStringLiteral();
		sDone2.setEscapedValue("\"Done!\"");
		methodInv2.arguments().add(sDone2);
		ExpressionStatement es2 = ast.newExpressionStatement(methodInv2);

		block.statements().add(es2);
		
		//将语句块节点Block连接为IfStatement节点的子节点
		node.setThenStatement(block);
 
		return false;
	}
}

 类3：

package astTest;

import java.util.ArrayList;
import java.util.List;

import org.eclipse.jdt.core.dom.AST;
import org.eclipse.jdt.core.dom.ASTNode;
import org.eclipse.jdt.core.dom.ASTVisitor;
import org.eclipse.jdt.core.dom.Block;
import org.eclipse.jdt.core.dom.ClassInstanceCreation;
import org.eclipse.jdt.core.dom.Expression;
import org.eclipse.jdt.core.dom.ExpressionStatement;
import org.eclipse.jdt.core.dom.IfStatement;
import org.eclipse.jdt.core.dom.InstanceofExpression;
import org.eclipse.jdt.core.dom.MethodDeclaration;
import org.eclipse.jdt.core.dom.MethodInvocation;
import org.eclipse.jdt.core.dom.Modifier;
import org.eclipse.jdt.core.dom.SimpleType;
import org.eclipse.jdt.core.dom.SingleVariableDeclaration;
import org.eclipse.jdt.core.dom.Type;
import org.eclipse.jdt.core.dom.TypeDeclaration;

public class InstanceOfRefactor extends ASTVisitor{
	List bodyDeclarations=null;
	@Override
	public boolean visit(IfStatement node) {
		// TODO Auto-generated method stub
		SimpleType childTpye=null;
		Expression child=null;
		Block ifBolck=null;
		Block elseBolck=null;
		//判断是否符合重构条件 if,else,instanceof 
		if (node.getExpression() instanceof InstanceofExpression
				&&!(node.getElseStatement() instanceof IfStatement)) {
			InstanceofExpression  expression= (InstanceofExpression) node.getExpression();
			//提取条件中的对象,获取父类
			child=expression.getLeftOperand();
			childTpye=(SimpleType) expression.getRightOperand();
			//提取if体
			ifBolck=(Block)(node.getThenStatement());
			//提取else体
			elseBolck=(Block)(node.getElseStatement());
			
			
		}else {
			return false;
		}
		AST ast=node.getAST();
		//构建if方法块
		buildIfBlock(node, childTpye, child, ifBolck);
		//构建else方法块
		buildElseBlock(node, childTpye, child, elseBolck);
		//保存if块前后的内容
		List<ASTNode> functionPartUpper=new ArrayList<>();
		List<ASTNode> functionPartTail=new ArrayList<>();

		Tool.saveIfUpperAndTail(node, functionPartUpper, functionPartTail);
		//构建if上级内的其他内容
		changeMethordUsed(node, ast, functionPartUpper, functionPartTail);
		
		return false;
	}
	public void changeMethordUsed(IfStatement node, AST ast, List<ASTNode> functionPartUpper,
			List<ASTNode> functionPartTail) {
		//原来的头
		Block funcBlock=((Block)node.getParent());
		funcBlock.statements().clear();
		Tool.arrayAddToStatements(node,functionPartUpper,funcBlock.statements());
		MethodInvocation newMethord=ast.newMethodInvocation();
		newMethord.setName(ast.newSimpleName("fun01"));

	    newMethord.arguments().add(ast.newSimpleName("customer"));
		
		ExpressionStatement es2 = ast.newExpressionStatement(newMethord);
		funcBlock.statements().add(es2);

		//原来的尾
		Tool.arrayAddToStatements(node,functionPartTail,funcBlock.statements());
		//保存文件
	}
	public void buildIfBlock(IfStatement node, SimpleType childTpye, Expression child, Block ifBolck) {
		ASTNode astNode=node.getParent().getParent().getParent();
		AST ast=node.getParent().getParent().getParent().getAST();

		MethodDeclaration ifFun= astNode.getAST().newMethodDeclaration();
		ifFun.setName(astNode.getAST().newSimpleName("fun01"));
		ifFun.modifiers().add(ast.newModifier(Modifier.ModifierKeyword.PRIVATE_KEYWORD));
		SingleVariableDeclaration param=ast.newSingleVariableDeclaration();
		param.setType((Type) Tool.copyBlock(node, childTpye));
		param.setName(astNode.getAST().newSimpleName(child.toString()));
		ifFun.parameters().add(param);
		ifFun.setBody((Block)Tool.copyBlock(node, ifBolck));

		bodyDeclarations.add(ifFun);
	}
	public void buildElseBlock(IfStatement node, SimpleType childTpye, Expression child, Block elseBolck) {
		ASTNode astNode=node.getParent().getParent().getParent();
		AST ast=node.getParent().getParent().getParent().getAST();

		MethodDeclaration ifFun= astNode.getAST().newMethodDeclaration();
		ifFun.setName(astNode.getAST().newSimpleName("fun01"));
		ifFun.modifiers().add(ast.newModifier(Modifier.ModifierKeyword.PRIVATE_KEYWORD));
		SingleVariableDeclaration param=ast.newSingleVariableDeclaration();
		param.setType(astNode.getAST().newSimpleType(ast.newSimpleName( "User" )));
		param.setName(astNode.getAST().newSimpleName(child.toString()));
		ifFun.parameters().add(param);
		ifFun.setBody((Block)Tool.copyBlock(node, elseBolck));

		bodyDeclarations.add(ifFun);
	}
	  @Override
	    public boolean visit(TypeDeclaration node) {
		  bodyDeclarations= node.bodyDeclarations();
	        System.out.println("Class:\t" + node.getName());
	        return true;
	    }
}