获得所有接口信息

简介

可以通过获得RequestMappingHandlerMapping.class的bean，然后通过其getHandlerMethods()获得所有接口。

示例

控制器

package com.example.controller;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
@RestController
@RequestMapping("/hello")
public class HelloController {
    @GetMapping("/test1")
    public String test1() {
        return "hello";
    }
    @GetMapping("/test2")
    public String test2() {
        return "hehe";
    }
}

获得接口

package com.example.config;
import com.alibaba.fastjson.JSON;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.fasterxml.jackson.databind.json.JsonMapper;
import org.springframework.beans.BeansException;
import org.springframework.boot.ApplicationArguments;
import org.springframework.boot.ApplicationRunner;
import org.springframework.context.ApplicationContext;
import org.springframework.context.ApplicationContextAware;
import org.springframework.stereotype.Component;
import org.springframework.web.method.HandlerMethod;
import org.springframework.web.servlet.mvc.method.RequestMappingInfo;
import org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerMapping;
import java.util.Map;
@Component
public class ApplicationContextTest implements ApplicationContextAware, ApplicationRunner {
    private ApplicationContext applicationContext;
    RequestMappingHandlerMapping handlerMapping;
    @Override
    public void setApplicationContext(ApplicationContext applicationContext) throws BeansException {
        this.applicationContext = applicationContext;
    }
    @Override
    public void run(ApplicationArguments args) throws Exception {
        handlerMapping = applicationContext.getBean(RequestMappingHandlerMapping.class);
        Map<RequestMappingInfo, HandlerMethod> handlerMethods = handlerMapping.getHandlerMethods();
    }
}

在此代码最后一行打断点，运行之后在“Evaluate Expression”输入：handlerMapping.getHandlerMethods()；

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查看其中的某一项，比如：/hello/test1

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注：本处我本来想用Fastjson将handleMethods打印出来，但报错了，需进一步确定报错原因。
报错日志：

Caused by: java.lang.IllegalStateException: Cannot retrieve Parameter descriptor for method return type
    at org.springframework.core.MethodParameter.getParameter(MethodParameter.java:251) ~[spring-core-5.2.6.RELEASE.jar:5.2.6.RELEASE]
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:1.8.0_201]
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[na:1.8.0_201]
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:1.8.0_201]
    at java.lang.reflect.Method.invoke(Method.java:498) ~[na:1.8.0_201]
    at com.fasterxml.jackson.databind.ser.BeanPropertyWriter.serializeAsField(BeanPropertyWriter.java:689) ~[jackson-databind-2.11.0.jar:2.11.0]
    at com.fasterxml.jackson.databind.ser.std.BeanSerializerBase.serializeFields(BeanSerializerBase.java:723) ~[jackson-databind-2.11.0.jar:2.11.0]
    ... 63 common frames omitted