Spring Boot之允許接口跨域並實現攔截CORS

pom.xml(依賴的jar)

 

// 在spring-boot-starter-web的啓動器中，已經依賴好了
<dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
</dependency>

CORS跨域的配置（主要配置允許什麼樣的方法跨域）

 

import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.cors.CorsConfiguration;
import org.springframework.web.cors.UrlBasedCorsConfigurationSource;
import org.springframework.web.filter.CorsFilter;
import org.springframework.web.servlet.config.annotation.CorsRegistry;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurerAdapter;
import java.util.ArrayList;
import java.util.List;
/**
 * Created by Msater Zg on 2017/4/3.
 */
@Configuration
public class CorsConfig extends WebMvcConfigurerAdapter {
    @Override
    public void addCorsMappings(CorsRegistry registry) {
        registry.addMapping("/**")
                .allowedOrigins("*")
                .allowCredentials(true)
                .allowedMethods("GET", "POST", "DELETE", "PUT")
                .maxAge(3600);
    }
    private CorsConfiguration buildConfig() {
        CorsConfiguration corsConfiguration = new CorsConfiguration();
        List<String> list = new ArrayList<>();
        list.add("*");
        corsConfiguration.setAllowedOrigins(list);
        /*
        // 請求常用的三種配置，*代表允許所有，當時你也可以自定義屬性（比如header只能帶什麼，只能是post方式等等）
        */
        corsConfiguration.addAllowedOrigin("*");  
        corsConfiguration.addAllowedHeader("*"); 
        corsConfiguration.addAllowedMethod("*");  
        return corsConfiguration;
    }
    @Bean
    public CorsFilter corsFilter() {
        UrlBasedCorsConfigurationSource source = new UrlBasedCorsConfigurationSource();
        source.registerCorsConfiguration("/**", buildConfig());
        return new CorsFilter(source);
    }
}

攔截器配置(可以根據不同路徑，配置不同的攔截器)

 

import org.springframework.web.servlet.HandlerInterceptor;
import org.springframework.web.servlet.ModelAndView;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
/**
 * Created by Msater Zg on 2017/4/5.
 * 攔截器
 */
public class ApiInterceptor implements HandlerInterceptor {
    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        // 請求前調用
        System.out.println("攔截了");
        return true;
    }
    @Override
    public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception {
        // 請求過程中調用
        System.out.println("攔截了");
    }
    @Override
    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {
        // 請求完成時調用
        System.out.println("攔截了");
    }
}

攔截器管理類，用於生成項目的攔截器鏈

 

import org.springframework.context.annotation.Configuration;
import org.springframework.web.servlet.config.annotation.InterceptorRegistry;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurerAdapter;
/**
 * Created by Msater Zg on 2017/4/5.
 * 攔截器管理工具
 */
@Configuration
public class MyWebAppConfigurer extends WebMvcConfigurerAdapter {
    @Override
    public void addInterceptors(InterceptorRegistry registry) {
        // 多個攔截器組成一個攔截器鏈
        // addPathPatterns 用於添加攔截規則
        // excludePathPatterns 用戶排除攔截
        registry.addInterceptor(new ApiInterceptor()).addPathPatterns("/user/**");  //對來自/user/** 這個鏈接來的請求進行攔截
        super.addInterceptors(registry);
    }
}

結語

實現跨域的方式有很多，這只是其中一種。有什麼不對的地方希望能及時指出。謝謝！