对于spring-security来说，当你访问一个受保护资源时，需要检查你的token，当没有传递，或者传递的token有错误时，将出现401unauthorized异常；当你传递的token是有效的，但解析后并没有访问这个资源的权限时，将返回403forbidden的异常，而你通过拦截器@RestControllerAdvice是不能重写这两个异常消息的，我们下面介绍重写这两种消息的方法。

两个接口

• AccessDeniedHandler 实现重写403的消息
• AuthenticationEntryPoint 实现重写401的消息

代码

• CustomAccessDeineHandler

public class CustomAccessDeineHandler implements AccessDeniedHandler {

  @Override
  public void handle(HttpServletRequest request, HttpServletResponse response,
                     AccessDeniedException accessDeniedException) throws IOException, ServletException {
    response.setCharacterEncoding("utf-8");
    response.setContentType("application/json;charset=utf-8");
    response.getWriter().print(JSONObject.toJSONString(CommonResult.forbiddenFailure("没有访问权限!")));
  }

}

• CustomAuthenticationEntryPoint

public class CustomAuthenticationEntryPoint implements AuthenticationEntryPoint {

  @Override
  public void commence(HttpServletRequest request, HttpServletResponse response,
                       AuthenticationException authException) throws IOException, ServletException {
    response.setCharacterEncoding("utf-8");
    response.setContentType("application/json;charset=utf-8");
    response.getWriter().print(JSONObject.toJSONString(CommonResult.unauthorizedFailure("需要先认证才能访问!")));
  }

}

• WebSecurityConfig.configure中添加注入代码

  // 401和403自定义
  http.exceptionHandling().authenticationEntryPoint(new CustomAuthenticationEntryPoint())
      .accessDeniedHandler(new CustomAccessDeineHandler());

• 效果

//没有传token，或者token不合法
{
    "code": 401,
    "message": "需要先认证才能访问!"
}
//token中没有权限
{
    "code": 403,
    "message": "没有访问权限!"
}