正則表達式在單行/多行中爲Java類查找註釋

Question

我想在Java中開發一個正則表達式來查找單行/多行中用於Java類的註釋。剛纔我正在嘗試這一個

String regExp = "^\\s*(@.+)$"; 

但它只適用於單行，不適用於多行.e.g。

@NamedNativeQuery(name = "nativeSQL", query = "SELECT emp1.emp_id, emp1.name, emp1.manager_id, " 
+ "emp1.dept_id, emp1.address_id " + "FROM EMP emp1, EMP emp2 " 
+ "WHERE ((emp2.EMP_ID = ?) AND (emp2.EMP_ID = emp1.MANAGER_ID))", resultClass = Professor.class) 

在給出的例子中，我想提取鍵值對，例如

name = "nativeSQL" 
query = "SELECT emp1.emp_id, emp1.name, emp1.manager_id, " 
+ "emp1.dept_id, emp1.addr 

Answer 1

這裏是你可以用多行註釋則表達式來提取name和query代碼：

String line = "@NamedNativeQuery(name = \"nativeSQL\", query = \"SELECT emp1.emp_id, emp1.name, emp1.manager_id, \"\n" + 
"+ \"emp1.dept_id, emp1.address_id \" + \"FROM EMP emp1, EMP emp2 \"\n" + 
"+ \"WHERE ((emp2.EMP_ID = ?) AND (emp2.EMP_ID = emp1.MANAGER_ID))\", resultClass = Professor.class)\n"; 
Pattern pt = Pattern.compile("^\\s*@NamedNativeQuery\\(\\s*name\\s*=\\s*\"(.+)\"\\s*,\\s*query\\s*=\\s*\"(.+)\"\\s*,", Pattern.DOTALL); 
Matcher m = pt.matcher(line); 
if (m.find()) 
    System.out.println("name: [" + m.group(1) + "] query: [" + m.group(2) + ']'); 

OUTPUT：

name: [nativeSQL] query: [SELECT emp1.emp_id, emp1.name, emp1.manager_id, " 
+ "emp1.dept_id, emp1.address_id " + "FROM EMP emp1, EMP emp2 " 
+ "WHERE ((emp2.EMP_ID = ?) AND (emp2.EMP_ID = emp1.MANAGER_ID))]