一:过滤器 1.过滤器介绍 过滤器是处于客户端与服务器资源文件之间的一道过滤网,帮助我们过滤一些不符合要求的请求。通常用作 Session校验,判断用户权限。 2.过滤器生命周期 使用过滤器很简单,只需要实现Filter类,然后重写它的3个
过滤器是处于客户端与服务器资源文件之间的一道过滤网,帮助我们过滤一些不符合要求的请求。通常用作 Session校验,判断用户权限。
使用过滤器很简单,只需要实现Filter类,然后重写它的3个方法即可。
@springBootApplication@ServletComponentScan // 过滤器public class Springboot02WebTestApplication { SpringApplication.run(Springboot02WebTestApplication.class, args);}
import com.alibaba.fastJSON.jsONObject;import org.springframework.core.annotation.Order;import javax.servlet.*;import javax.servlet.annotation.WebFilter;import javax.servlet.http.HttpServletRequest;import java.io.IOException;import java.io.PrintWriter;// urlPatterns 过滤路径 filterName 过滤器name@WebFilter(urlPatterns = "/user/*", filterName = "tokenFilter1")public class TokenFilter1 implements Filter { @Override public void init(FilterConfig filterConfig) throws ServletException {// Filter.super.init(filterConfig); System.out.println("init"); } @Override public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException { System.out.println("doFilter"); HttpServletRequest request = (HttpServletRequest) servletRequest; String token = request.getHeader("token"); System.out.println(token); //该方法执行后直接运行至下一个过滤器 if(token!=null){ filterChain.doFilter(servletRequest, servletResponse); }else{ servletResponse.setCharacterEncoding("UTF-8"); servletResponse.setContentType("application/json; charset=utf-8"); PrintWriter out = servletResponse.getWriter(); JSONObject res = new JSONObject(); res.put("msg", "错误"); res.put("success", "false"); out.append(res.toString()); } } @Override public void destroy() {// Filter.super.destroy(); System.out.println("destroy"); }}
添加请求头token信息,才可以访问成功。
import com.alibaba.fastjson.JSONObject;import javax.servlet.*;import javax.servlet.http.HttpServletRequest;import java.io.IOException;import java.io.PrintWriter;public class TokenFilter2 implements Filter { @Override public void init(FilterConfig filterConfig) throws ServletException { System.out.println("init"); } @Override public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException { System.out.println("doFilter"); HttpServletRequest request = (HttpServletRequest) servletRequest; String token = request.getHeader("token"); System.out.println(token); //该方法执行后直接运行至下一个过滤器 if(token!=null){ filterChain.doFilter(servletRequest, servletResponse); }else{ servletResponse.setCharacterEncoding("UTF-8"); servletResponse.setContentType("application/json; charset=utf-8"); PrintWriter out = servletResponse.getWriter(); JSONObject res = new JSONObject(); res.put("msg", "错误"); res.put("success", "false"); out.append(res.toString()); } } @Override public void destroy() { System.out.println("destroy"); }}
import com.itsufu.filter.TokenFilter2;import org.springframework.boot.web.servlet.FilterReGIStrationBean;import org.springframework.context.annotation.Bean;import org.springframework.context.annotation.Configuration;@Configurationpublic class FilterConfig { // Filter代码类 @Bean public TokenFilter2 tokenFilter2() { return new TokenFilter2(); } @Bean public FilterRegistrationBean getFilterRegistrationBean(TokenFilter2 tokenFilter2) { FilterRegistrationBean filterRegistrationBean = new FilterRegistrationBean(); filterRegistrationBean.setFilter(tokenFilter2); filterRegistrationBean.setOrder(2); filterRegistrationBean.addUrlPatterns("/user/*"); filterRegistrationBean.setName("tokenFilter2"); return filterRegistrationBean; }}
在此,祝各位帅哥美女,步步高升,一帆风顺!!!
来源地址:https://blog.csdn.net/Microhoo_/article/details/129968379
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本文标题: springboot使用过滤器
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