注意：JavaWeb带有的过滤器要比SpringBoot带有拦截器先发生
1.第一步，在SpringBoot的启动类上配置扫描过滤器的注解package com.jshiming;
import lombok.extern.slf4j.Slf4j;
import org.mybatis.spring.annotation.MapperScan;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.boot.web.servlet.ServletComponentScan;
@Slf4j
@SpringBootApplication
@MapperScan("com.jshiming.fun.*.dao")
@ServletComponentScan("com.jshiming.common.filter") //扫描过滤器
public class JshimingApplication2 {
public static void main(String[] args) {
SpringApplication.run(JshimingApplication2.class, args);
}
}
2.第二步，写一个过滤器的类
package com.jshiming.common.filter;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.jshiming.common.Constants;
import com.jshiming.common.Result;
import lombok.extern.slf4j.Slf4j;
import javax.servlet.*;
import javax.servlet.annotation.WebFilter;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import java.io.IOException;
import java.io.PrintWriter;
@Slf4j
@WebFilter("
//获得当前请求路径
String path = request.getServletPath();
if("/login.html".equals(path) || "/security/login".equals(path)
||path.startsWith("/assets/")||path.startsWith("/css/")
||path.startsWith("/fonts/")||path.startsWith("/js/")){
chain.doFilter(req,resp); //继续做过滤，即放行
return;
}
HttpSession session = request.getSession();
Object currentStore = session.getAttribute(Constants.SESSION_ATTR_NAME_CURRENT_STORE);
if(currentStore != null){
chain.doFilter(req,resp);
return;
}
//不放行怎么办
if("XMLHttpRequest".equals(request.getHeader("X-Requested-With"))){
//ajax请求，发送标准化响应数据，如本案例中的Result对象
Result result = Result.err(Result.CODE_ERR_UNLOGINED,"请登录后访问！");
ObjectMapper objectMapper = new ObjectMapper();//SpringMVC提供的一种转换工具类（可转json串）
String jsonStr = objectMapper.writeValueAsString(result);//将Result对象转为json串
//将json串输出到浏览器(通过流)
response.setContentType("application/json;charset=UTF-8");//设置响应数据格式和编码
PrintWriter out = response.getWriter();
out.print(jsonStr);
out.flush();
out.close();
}else{//非ajax请求进行重定向，重定向到登录页面 Redirect
response.sendRedirect(request.getContextPath()+"/login.html");
}
}
}
然后就没了，简简单单，so easy!
