JAVA语言语法树

软件课程设计

题目：Eclipse ast实现语法树

班级：

学号：

姓名：

指导教师：

时间：

一、课程设计要求：

用Eclipse AST分析java程序所形成的抽象语法树，并通过graphviz画出所对应的图。

二、开发环境：

操作系统：windows 7

开发工具：MyEclipse 8.x Graphviz2.28.0

四、具体代码：

1、获取根节点：

public class LxyAst {

private ASTParser astParser = ASTParser.newParser(AST.JLS3);

static String javaFilePath = "D:\\Users\\Administrator\\Workspaces\\MyEclipse 8.x\\LxyAst\\src\\lxy\\ast\\Test.java";

public CompilationUnit getCompilationUnit(String javaFilePath) throws Exception {

BufferedInputStream bufferedInputStream = new BufferedInputStream(new FileInputStream(javaFilePath));

byte[] input = new byte[bufferedInputStream.available()];

bufferedInputStream.read(input);

bufferedInputStream.close();

this.astParser.setSource(new String(input).toCharArray());

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

return result;

}

2、将节点储存到txt中：

public void writetotext(String str, boolean i) {

try {

FileWriter fw = new FileWriter("E:\\t5.txt", i);

BufferedWriter bw = new BufferedWriter(fw);

bw.write(str);

bw.newLine();

bw.flush();

bw.close();

} catch (IOException e) {

System.out.print(e);

}

}

3、用graphviz画图：

public void Draw() {

Runtime rt = Runtime.getRuntime();

Process p = null;

try {

String s = "D:\\Program Files\\Graphviz 2.28\\bin\\dot E:\\t5.txt -Tpng -o result.png";

p = rt.exec(s);

} catch (Exception e) {

}

}

4、显示结果：

public void open() {

try {

Process p = Runtime.getRuntime().exec("cmd /c cd D:\\Users\\Administrator\\Workspaces\\MyEclipse 8.x\\LxyAst");

Process p2 = Runtime.getRuntime().exec("cmd /c start result.png");

} catch (Exception e) {

}

}

5、遍历语法树：

public void writexly(ASTNode node, String context) {

String wnode, nodename;

Loanode xqnode = new Loanode();

LxyAst xq = new LxyAst();

if (node.getParent() == null) {

xqnode.setMid(id);

xqnode.setPid(-1)