利用Eclipse JDT ASTRewrite添加注释

1、修改前

public class Main {    public static void main(String[] args) {        int i = 1;        System.out.println(i);    }    public static void add() {        int i = 1;        System.out.println(i);    }}

2、修改后

public class Main {    public static void main(String[] args) {        //mycomment        int i = 1;        System.out.println(i);    }    public static void add() {        int i = 1;        System.out.println(i);    }}

3、源码

private void AddComments() throws MalformedTreeException, BadLocationException, CoreException {    IProject project = ResourcesPlugin.getWorkspace().getRoot().getProject("testAddComments");    IJavaProject javaProject = JavaCore.create(project);    IPackageFragment package1 = javaProject.getPackageFragments()[0];    //get first compilation unit    ICompilationUnit unit = package1.getCompilationUnits()[0];    // parse compilation unit    CompilationUnit astRoot = parse(unit);    //create a ASTRewrite    AST ast = astRoot.getAST();    ASTRewrite rewriter = ASTRewrite.create(ast);    //for getting insertion position    TypeDeclaration typeDecl = (TypeDeclaration) astRoot.types().get(0);    MethodDeclaration methodDecl = typeDecl.getMethods()[0];    Block block = methodDecl.getBody();    ListRewrite listRewrite = rewriter.getListRewrite(block, Block.STATEMENTS_PROPERTY);    Statement placeHolder = (Statement) rewriter.createStringPlaceholder("//mycomment", ASTNode.EMPTY_STATEMENT);    listRewrite.insertFirst(placeHolder, null);    TextEdit edits = rewriter.rewriteAST();    // apply the text edits to the compilation unit    Document document = new Document(unit.getSource());    edits.apply(document);    // this is the code for adding statements    unit.getBuffer().setContents(document.get());    System.out.println("done");}