这个关键字在servlet中不起作用

Question

在下面的servlet中,我想添加内容类型和字符集编码.

  public class FBOAuth extends HttpServlet {
  public void service(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
     PrintWriter out = response.getWriter();
     this.response.setContentType("application/json");
     this.response.setCharacterEncoding("UTF-8");
...

我使用以下命令编译此servlet.

$ javac -classpath json.jar FBOAuth.java

错误

FBOAuth.java:24: error: cannot find symbol
this.response.setContentType("application/json");
    ^
symbol: variable response
FBOAuth.java:25: error: cannot find symbol
this.response.setCharacterEncoding("UTF-8");
    ^
 symbol: variable response
 2 errors

Answer 1

this.之前删除response.它们是参数,而不是类变量.