SpringBoot配置自定義攔截器實現(xiàn)過程詳解

更新時間：2022年10月27日 16:13:31 作者：是趙敢敢啊

在系統(tǒng)中經(jīng)常需要在處理用戶請求之前和之后執(zhí)行一些行為,例如檢測用戶的權(quán)限,或者將請求的信息記錄到日志中,即平時所說的"權(quán)限檢測"及"日志記錄",下面這篇文章主要給大家介紹了關(guān)于在SpringBoot項目中整合攔截器的相關(guān)資料,需要的朋友可以參考下

1. HttpServletRequest包裝類

因為HttpServletRequest只能讀取一次，所以需要對request進行包裝，變成可重復讀的request.

package net.lesscoding.interceptor;
import javax.servlet.ReadListener;
import javax.servlet.ServletInputStream;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletRequestWrapper;
import java.io.*;
/**
 *  由于流只能讀取一次，所以使用此包裝類對HttpServletRequest對象進行包裝，讀取完之后再將
 *  內(nèi)容塞回去，不影響后續(xù)springmvc的參數(shù)處理。
 */
public class RequestWrapper extends HttpServletRequestWrapper {
    private String body;
    public RequestWrapper(HttpServletRequest request) {
        super(request);
        if (request.getHeader("Content-Type") != null
                && request.getHeader("Content-Type").contains("multipart/form-data")){
            try{
                request.getParts();
            }catch (Exception e){
                e.printStackTrace();
            }
        }
        StringBuilder stringBuilder = new StringBuilder();
        try (InputStream inputStream = request.getInputStream();
             BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(inputStream))){
            char[] charBuffer = new char[128];
            int bytesRead = -1;
            while ((bytesRead = bufferedReader.read(charBuffer)) > 0) {
                stringBuilder.append(charBuffer, 0, bytesRead);
            }
        }catch (NullPointerException ex){
            stringBuilder.append("");
        } catch (Exception ex) {
        }
        body = stringBuilder.toString();
    }
    @Override
    public ServletInputStream getInputStream() throws IOException {
        final ByteArrayInputStream byteArrayInputStream = new ByteArrayInputStream(body.getBytes());
        ServletInputStream servletInputStream = new ServletInputStream() {
            @Override
            public boolean isFinished() {
                return false;
            }
            @Override
            public boolean isReady() {
                return false;
            }
            @Override
            public void setReadListener(ReadListener readListener) {
            }
            @Override
            public int read() throws IOException {
                return byteArrayInputStream.read();
            }
        };
        return servletInputStream;

    }
    @Override
    public BufferedReader getReader() throws IOException {
        return new BufferedReader(new InputStreamReader(this.getInputStream()));
    }
    public String getBody() {
        return body;
    }
    public void setBody(String body) {
        this.body = body;
    }
}

2. 使用Filter將request傳遞下去

因為filter是在request前邊執(zhí)行的，所以我們需要使用一個filter將我們包裝好的request傳遞下去，讓后邊使用的request都是我們包裝好的，防止出現(xiàn)流已經(jīng)被讀取的錯誤出現(xiàn)

package net.lesscoding.filter;
import net.lesscoding.interceptor.RequestWrapper;
import javax.servlet.*;
import javax.servlet.http.HttpServletRequest;
import java.io.IOException;
/**
 * @apiNote 傳遞request的過濾器
 */
public class RepeatedlyReadFilter implements Filter {
    @Override
    public void init(FilterConfig filterConfig) throws ServletException {
    }
    @Override
    public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException {
        ServletRequest requestWrapper = null;
        if(request instanceof HttpServletRequest){
            requestWrapper = new RequestWrapper((HttpServletRequest) request);
        }
        chain.doFilter( requestWrapper == null ? request : requestWrapper,response );
    }
    @Override
    public void destroy() {
    }
}

3. 添加攔截器

這里我們添加一個判斷用戶登錄狀態(tài)的攔截器，從 request中獲取token信息，查詢redis如果redis存在則用戶已經(jīng)登錄，否則就返回false

package net.lesscoding.interceptor;
import cn.hutool.core.util.StrUtil;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.annotation.Configuration;
import org.springframework.data.redis.core.RedisTemplate;
import org.springframework.web.servlet.HandlerInterceptor;
import org.springframework.web.servlet.ModelAndView;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.util.concurrent.TimeUnit;
/**
 * @apiNote 登錄攔截器
 */
@Configuration
public class LoginInterceptor implements HandlerInterceptor {
    @Autowired
    private RedisTemplate redisTemplate;
    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        String token = request.getHeader("AccessToken");
        String redisToken = String.valueOf(redisTemplate.opsForValue().get(token));
        if(StrUtil.isBlank(redisToken)){
            throw new RuntimeException("token失效,請重新登錄");
        }
        // 這里為了方便 成功之后就刷新在redis中的時間
        redisTemplate.opsForValue().set("token",redisToken,30, TimeUnit.MINUTES);
        return true;
    }
    @Override
    public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception {
    }
    @Override
    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {
    }
}

4. 全局異常處理器

使用全局異常處理器捕獲攔截器拋出的異常信息，做統(tǒng)一返回

package net.lesscoding.config;
import lombok.extern.slf4j.Slf4j;
import net.lesscoding.common.Result;
import net.lesscoding.common.ResultFactory;
import org.springframework.web.bind.annotation.ExceptionHandler;
import org.springframework.web.bind.annotation.RestControllerAdvice;
/**
 * @apiNote 全局異常處理器
 */
@RestControllerAdvice
@Slf4j
public class GlobalExceptionHandler {
    @ExceptionHandler(value = RuntimeException.class)
    public Result runtimeExceptionHandler(RuntimeException e){
        e.printStackTrace();
        log.error("{}", e.getMessage());
        return ResultFactory.buildThrowable(e);
    }
    @ExceptionHandler(value = Exception.class)
    public Result exceptionHandler(Exception e){
        e.printStackTrace();
        log.error("{}", e.getMessage());
        return ResultFactory.buildThrowable(e);
    }
    @ExceptionHandler(value = Throwable.class)
    public Result exceptionHandler(Throwable t){
        t.printStackTrace();
        log.error("{}", t.getMessage());
        return ResultFactory.buildThrowable(t);
    }
}

5. 配置攔截器

對攔截器進行注冊，指定攔截哪些url請求

package net.lesscoding.config;
import net.lesscoding.filter.RepeatedlyReadFilter;
import net.lesscoding.interceptor.LoginInterceptor;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.web.servlet.FilterRegistrationBean;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.servlet.config.annotation.InterceptorRegistry;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurer;
/**
 * @apiNote 對項目進行配置攔截器
 */
@Configuration
public class LoginConfiguration implements WebMvcConfigurer {
    @Autowired
    private LoginInterceptor loginInterceptor;
    @Bean
    public FilterRegistrationBean repeatedlyReadFilter(){
        FilterRegistrationBean registration = new FilterRegistrationBean();
        RepeatedlyReadFilter repeatedlyReadFilter = new RepeatedlyReadFilter();
        registration.setFilter(repeatedlyReadFilter);
        registration.addUrlPatterns("/*");
        return registration;
    }
    @Override
    public void addInterceptors(InterceptorRegistry registry) {
        registry.addInterceptor(loginInterceptor)
                // 攔截所有請求
                .addPathPatterns("/**")
                // 排除登錄注冊修改密碼等接口
                .excludePathPatterns("/oauth/**","/login/**","logout/**","/common/**", "options","/try/**","/user/updatePwd")
                // 判處swagger等接口
                .excludePathPatterns("/doc.html","/swagger-resources/**", "/webjars/**", "/v2/**", "/swagger-ui.html/**","/favicon.ico")
        ;
    }
}

到此這篇關(guān)于SpringBoot配置自定義攔截器實現(xiàn)過程詳解的文章就介紹到這了,更多相關(guān)SpringBoot自定義攔截器內(nèi)容請搜索腳本之家以前的文章或繼續(xù)瀏覽下面的相關(guān)文章希望大家以后多多支持腳本之家！

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