JDT生成代码实例 package ast.test.demo; import org.eclips

文件名称: JDT生成代码实例

所属分类: Java

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文件大小: 18kb

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上传时间: 2018-07-27

提供者: jiuji*****

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详细说明： package ast.test.demo; import org.eclipse.jdt.core.dom.AST; import org.eclipse.jdt.core.dom.Assignment; import org.eclipse.jdt.core.dom.Block; import org.eclipse.jdt.core.dom.ClassInstanceCreation; import org.eclipse.jdt.core.dom.CompilationUnit; import org.eclipse.jdt.core.dom.ExpressionStatement; import org.eclipse.jdt.core.dom.IfStatement; import org.eclipse.jdt.core.dom.ImportDeclaration; import org.eclipse.jdt.core.dom.InfixExpression; import org.eclipse.jdt.core.dom.MethodDeclaration; import org.eclipse.jdt.core.dom.Metho dInvocation; import org.eclipse.jdt.core.dom.Modifier; import org.eclipse.jdt.core.dom.NumberLiteral; import org.eclipse.jdt.core.dom.PackageDeclaration; import org.eclipse.jdt.core.dom.PrimitiveType; import org.eclipse.jdt.core.dom.ReturnStatement; import org.eclipse.jdt.core.dom.SingleVariableDeclaration; import org.eclipse.jdt.core.dom.StringLiteral; import org.eclipse.jdt.core.dom.SuperConstructorInvocation; import org.eclipse.jdt.core.dom.ThrowStatement; import org.eclipse.jdt.core.dom.TypeDeclaration; import org.eclipse.jdt.core.dom.TypeLiteral; import org.eclipse.jdt.core.dom.VariableDeclarationFragment; import org.eclipse.jdt.core.dom.VariableDeclarationStatement; import org.eclipse.jdt.core.dom.Assignment.Operator; import org.eclipse.jdt.core.dom.Modifier.ModifierKeyword; public class Demo { public static void main(String[] args) { AST ast = AST.newAST(AST.JLS3); CompilationUnit compilationUnit = ast.newCompilationUnit(); //创建类 TypeDeclaration programClass = ast.newTypeDeclaration(); programClass.setName(ast.newSimpleName("Program")); //设定类或接口的修饰类型 programClass.modifiers().add(ast.newModifier(ModifierKeyword.PUBLIC_KEYWORD)); //将创建好的类添加到文件 compilationUnit.types().add(programClass); //创建包 PackageDeclaration packageDeclaration = ast.newPackageDeclaration(); //设定包名 packageDeclaration.setName(ast.newName("com.aptech.lzh")); //将创建好的添加到文件 compilationUnit.setPackage(packageDeclaration); //要导入的包 String[] imports = {"java.util.Date", "java.util.Random"}; for(String imp : imports){ //创建一个新包声名 ImportDeclaration importDeclaration = ast.newImportDeclaration(); //添加包说明 importDeclaration.setName(ast.newName(imp)); //将包声名加入文件中 compilationUnit.imports().add(importDeclaration); } //创建一个main方法 { //创建一个方法声名 MethodDeclaration main = ast.newMethodDeclaration(); main.setName(ast.newSimpleName("main")); main.modifiers().add(ast.newModifier(Modifier.ModifierKeyword.PUBLIC_KEYWORD)); //为方法添加静态声名 main.modifiers().add(ast.newModifier(ModifierKeyword.STATIC_KEYWORD)); //为方法增加返回值类型声明 main.setReturnType2(ast.newPrimitiveType(PrimitiveType.VOID)); //将方法装入类中 programClass.bodyDeclarations().add(main); //为方法增加语句块 Block mainBlock = ast.newBlock(); main.setBody(mainBlock); //给main方法定义String[]参数 SingleVariableDeclaration mainParameter = ast.newSingleVariableDeclaration(); //设置参数名称为arg mainParameter.setName(ast.newSimpleName("arg")); //设置参数类型为String[] mainParameter.setType(ast.newArrayType(ast.newSimpleType(ast.newName("String")))); main.parameters().add(mainParameter); //创建Pragram对象: Program program=new Program(); //创建一个变量声名明（变量的前半部份） VariableDeclarationFragment fragment = ast.newVariableDeclarationFragment(); //（1）设置变量名称 fragment.setName(ast.newSimpleName("program")); //（2）为变量创建表AST节点类型 VariableDeclarationStatement statement = ast.newVariableDeclarationStatement(fragment); //（3）对变量进行修鉓符设置 statement.setType(ast.newSimpleType(ast.newSimpleName("Program"))); //实例化变量 ClassInstanceCreation classInstanceCreation = ast.newClassInstanceCreation(); classInstanceCreation.setType(ast.newSimpleType(ast.newSimpleName("Program"))); //将变量实例化 fragment.setInitializer(classInstanceCreation); //将变量装入主句语块 mainBlock.statements().add(statement); //创建一个方法调用 //调用getString方法:String r = program.getString("中国"); MethodInvocation methodInvocation = ast.newMethodInvocation(); //设置引用方法对像 methodInvocation.set[removed]ast.newSimpleName("program")); //设置引用方法 methodInvocation.setName(ast.newSimpleName("getString")); //String参数（是一个字符串节点）方法参数字面值 StringLiteral stringLiteral = ast.newStringLiteral(); stringLiteral.setLiteralValue("中国"); //将其作为引用方法参数 methodInvocation.arguments().add(stringLiteral); //创建变量 VariableDeclarationFragment fragment2 = ast.newVariableDeclarationFragment(); //设置变量声名名称 fragment2.setName(ast.newSimpleName("r")); //将声名创建为一个AST节点 VariableDeclarationStatement statement3 = ast.newVariableDeclarationStatement(fragment2); //设置节点类型声名 statement3.setType(ast.newSimpleType(ast.newSimpleName("String"))); //调用methodInvocation方法，进行实例化 fragment2.setInitializer(methodInvocation); mainBlock.statements().add(statement3); //输出r的值: System.out.println(r); //(1)创建方法引用实例 MethodInvocation methodInvocation2 = ast.newMethodInvocation(); //(2)设置引用方法对像 methodInvocation2.set[removed]ast.newName("System.out")); //(3)设置方法名称 methodInvocation2.setName(ast.newSimpleName("println")); //设置方法参数 methodInvocation2.arguments().add(ast.newSimpleName("r")); //使用方法实例创建表达类型 ExpressionStatement statement2 = ast.newExpressionStatement(methodInvocation2); //将表达式添加到语句块 mainBlock.statements().add(statement2); } //构造方法 { //创建一个方法声名（构造函数方法） MethodDeclaration constructorMethod = ast.newMethodDeclaration(); //(1)声名为构造方法 constructorMethod.setConstructor(true); //(2)设置方法名称为program constructorMethod.setName(ast.newSimpleName("Program")); //(3)设置方法的修鉓类型为公开 constructorMethod.modifiers().add(ast.newModifier(ModifierKeyword.PUBLIC_KEYWORD)); { //基本类型的参数 SingleVariableDeclaration p1 = ast.newSingleVariableDeclaration(); //（1）设置参数名称为a p1.setName(ast.newSimpleName("a")); //（2）设置参数类型为INT p1.setType(ast.newPrimitiveType(PrimitiveType.INT)); //int[]类型的参数 SingleVariableDeclaration p2 = ast.newSingleVariableDeclaration(); p2.setName(ast.newSimpleName("b")); p2.setType(ast.newArrayType(ast.newPrimitiveType(PrimitiveType.INT))); //引用类型的参数(创建一个修鉓类型为final的参数 SingleVariableDeclaration p3 = ast.newSingleVariableDeclaration(); p3.setName(ast.newSimpleName("c")); p3.setType(ast.newSimpleType(ast.newName("Integer"))); p3.modifiers().add(ast.newModifier(ModifierKeyword.FINAL_KEYWORD)); //将参数添加到方法声名中 constructorMethod.parameters().add(p1); constructorMethod.parameters().add(p2); constructorMethod.parameters().add(p3); } //创建方法句语块（空） Block constructBlock = ast.newBlock(); //将句语块添加到方法中 constructorMethod.setBody(constructBlock); //将方法添加到类中 programClass.bodyDeclarations().add(constructorMethod); //创建super SuperConstructorInvocation superConstructorInvocation = ast.newSuperConstructorInvocation(); constructBlock.statements().add(superConstructorInvocation); superConstructorInvocation.arguments().add(ast.newNullLiteral()); } /**//*定义一个方法,形如: public String getString(String name){ String newString = name + "你好"; return newString; } */ { //创建getString()方法 MethodDeclaration getString = ast.newMethodDeclaration(); //（1）设置方法名称为getString getString.setName(ast.newSimpleName("getString")); //（2）设置方法public修饰 getString.modifiers().add(ast.newModifier(ModifierKeyword.PUBLIC_KEYWORD)); //（3）设置方法参数 SingleVariableDeclaration p = ast.newSingleVariableDeclaration(); //（3.1）设置参数名称p p.setName(ast.newSimpleName("p")); //（3.2）设置参数类型String p.setType(ast.newSimpleType(ast.newName("String"))); //将参数添加到方法中 getString.parameters().add(p); //设置return类型 getString.setReturnType2(ast.newSimpleType(ast.newSimpleName("String"))); //创建块 Block block = ast.newBlock(); //将句语块添加到方法中 getString.setBody(block); programClass.bodyDeclarations().add(getString); //方法内容----定义String变量 VariableDeclarationFragment fragment = ast.newVariableDeclarationFragment(); fragment.setName(ast.newSimpleName("newString")); //String newString = "初始值"; /**//*StringLiteral stringLiteral2 = ast.newStringLiteral(); stringLiteral2.setLiteralValue("初始值"); fragment.setInitializer(stringLiteral2);*/ //创建一个类实例引用 ClassInstanceCreation classInstanceCreation = ast.newClassInstanceCreation(); //引用实例名称 classInstanceCreation.setType(ast.newSimpleType(ast.newName("String"))); //创建赋值实例 SingleVariableDeclaration p1 = ast.newSingleVariableDeclaration(); //创建一个字面参数 StringLiteral stringLiteral3 = ast.newStringLiteral(); //设置字面值 stringLiteral3.setLiteralValue("初始值"); //将字面参数作为类引用赋值 classInstanceCreation.arguments().add(stringLiteral3); //将classInstanceCreateion实初始化之后，作为变量实例 fragment.setInitializer(classInstanceCreation); //创建一个变量节点 VariableDeclarationStatement statement = ast.newVariableDeclarationStatement(fragment); //设置变量类型 statement.setType(ast.newSimpleType(ast.newName("String"))); //创建一个新作业 newString = "你好"; Assignment assignment = ast.newAssignment(); //设置左侧 assignment.setLeftHandSide(ast.newSimpleName("newString")); //(1)设置方法传入字面值 StringLiteral stringLiteral = ast.newStringLiteral(); stringLiteral.setLiteralValue("你好"); //(2)将字面值设置在右侧 assignment.setRightHandSide(stringLiteral); //设置表达式的运算符 assignment.setOperator(Operator.ASSIGN); ExpressionStatement statement2 = ast.newExpressionStatement(assignment); block.statements().add(statement); block.statements().add(statement2); //方法调用 MethodInvocation methodInvocation = ast.newMethodInvocation(); //设置引用方法对像 methodInvocation.set[removed]ast.newName("newString")); //设置方法名称 methodInvocation.setName(ast.newSimpleName("index")); //方法名 //设置方法传入字面值 StringLiteral stringLiteral2 = ast.newStringLiteral(); stringLiteral2.setLiteralValue("值"); methodInvocation.arguments().add(stringLiteral2); //声名一个变量 VariableDeclarationFragment fragment2 = ast.newVariableDeclarationFragment(); //将方法声名加入变量 fragment2.setInitializer(methodInvocation); //设置变量名称 fragment2.setName(ast.newSimpleName("result")); //为变量声明一个Statement VariableDeclarationStatement statement3 = ast.newVariableDeclarationStatement(fragment2); //定义类型 statement3.setType(ast.newSimpleType(ast.newName("String"))); //将Statement装入语句块 block.statements().add(statement3); StringLiteral stringLiteral4 = ast.newStringLiteral(); stringLiteral4.setLiteralValue("你好"); //定义一个拼串对像name + "你好"; InfixExpression infixExpression = ast.newInfix[removed]); //(1)定义左侧 infixExpression.setLeftOperand(ast.newName("name")); //（2）设置连接符号 infixExpression.setOperator(org.eclipse.jdt.core.dom.InfixExpression.Operator.PLUS); //（3）定义右侧 infixExpression.setRightOperand(stringLiteral4); //创建一个新作业 newString = name + "你好"; Assignment assignment2 = ast.newAssignment(); assignment2.setLeftHandSide(ast.newSimpleName("newString")); assignment2.setOperator(Operator.ASSIGN); assignment2.setRightHandSide(infixExpression); ExpressionStatement statement4 = ast.newExpressionStatement(assignment2); block.statements().add(statement4); //创建一个return Statement ReturnStatement rs = ast.newReturnStatement(); rs.set[removed]ast.newName("newString")); block.statements().add(rs); } /** *//** * 定义一个方法,形如: * public String isOdd(int a) throws NullPointerException, Exception{ * if(a < 0) throw new Exception("数字不能为负数"); * * if(a % 2 == 0){ * return "偶数"; * }else{ * System.out.println("完"); * return "奇数"; * } */ { MethodDeclaration methodDeclaration = ast.newMethodDeclaration(); methodDeclaration.setName(ast.newSimpleName("isOdd")); methodDeclaration.modifiers().add(ast.newModifier(ModifierKeyword.PUBLIC_KEYWORD)); methodDeclaration.setReturnType2(ast.newSimpleType(ast.newSimpleName("String"))); //设置参数 SingleVariableDeclaration singleVariableDeclaration = ast.newSingleVariableDeclaration(); singleVariableDeclaration.setName(ast.newSimpleName("a")); singleVariableDeclaration.setType(ast.newPrimitiveType(PrimitiveType.INT)); methodDeclaration.parameters().add(singleVariableDeclaration); //抛出异常 methodDeclaration.thrownExceptions().add(ast.newSimpleName("NullPointerException")); methodDeclaration.thrownExceptions().add(ast.newSimpleName("Exception")); //创建块{} Block isOddBlock = ast.newBlock(); methodDeclaration.setBody(isOddBlock); //创建if与异常 IfStatement ifStatement = ast.newIfStatement(); //表达式 a < 0 InfixExpression infixExpression = ast.newInfix[removed]); infixExpression.setLeftOperand(ast.newSimpleName("a")); infixExpression.setOperator(org.eclipse.jdt.core.dom.InfixExpression.Operator.LESS); NumberLiteral numberLiteral = ast.newNumberLiteral("0"); infixExpression.setRightOperand(numberLiteral); ifStatement.set[removed]infixExpression); //设置if中的内容 ThrowStatement throwStatement = ast.newThrowStatement(); ClassInstanceCreation classInstanceCreation = ast.newClassInstanceCreation(); classInstanceCreation.setType(ast.newSimpleType(ast.newSimpleName("Exception"))); StringLiteral stringLiteral = ast.newStringLiteral(); stringLiteral.setLiteralValue("数字不能为负数"); classInstanceCreation.arguments().add(stringLiteral); throwStatement.set[removed]classInstanceCreation); ifStatement.setThenStatement(throwStatement); //if(a % 2 == 0) IfStatement ifStatement2 = ast.newIfStatement(); InfixExpression infixExpression2 = ast.newInfix[removed]); infixExpression2.setLeftOperand(ast.newSimpleName("a")); infixExpression2.setOperator(org.eclipse.jdt.core.dom.InfixExpression.Operator.REMAINDER); NumberLiteral numberLiteral2 = ast.newNumberLiteral("2"); infixExpression2.setRightOperand(numberLiteral2); InfixExpression infixExpression3 = ast.newInfix[removed]); infixExpression3.setLeftOperand(infixExpression2); infixExpression3.setOperator(org.eclipse.jdt.core.dom.InfixExpression.Operator.EQUALS); NumberLiteral numberLiteral3 = ast.newNumberLiteral("0"); infixExpression3.setRightOperand(numberLiteral3); ifStatement2.set[removed]infixExpression3); //return "偶数"; ReturnStatement returnStatement = ast.newReturnStatement(); StringLiteral stringLiteral2 = ast.newStringLiteral(); stringLiteral2.setLiteralValue("偶数"); returnStatement.set[removed]stringLiteral2); ifStatement2.setThenStatement(returnStatement); //else Block elseBlock = ast.newBlock(); MethodInvocation methodInvocation = ast.newMethodInvocation(); methodInvocation.set[removed]ast.newName("System.out")); methodInvocation.setName(ast.newSimpleName("println")); StringLiteral stringLiteral4 = ast.newStringLiteral(); stringLiteral4.setLiteralValue("完"); methodInvocation.arguments().add(stringLiteral4); ExpressionStatement statement = ast.newExpressionStatement(methodInvocation); elseBlock.statements().add(statement); ReturnStatement returnStatement2 = ast.newReturnStatement(); StringLiteral stringLiteral3 = ast.newStringLiteral(); stringLiteral3.setLiteralValue("奇数"); returnStatement2.set[removed]stringLiteral3); elseBlock.statements().add(returnStatement2); ifStatement2.setElseStatement(elseBlock); isOddBlock.statements().add(ifStatement); isOddBlock.statements().add(ifStatement2); programClass.bodyDeclarations().add(methodDeclaration); } System.out.println(compilationUnit.toString()); } } ...展开收缩

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