SpringMVC--高级操作

Love The Way You Lie 2022-12-19 06:13 163阅读 0赞

原文网址：[SpringMVC--高级操作\_IT利刃出鞘的博客-CSDN博客][SpringMVC--_IT_-CSDN]

# 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()；
> 
> ![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2ZlaXlpbmcwY2FuZ2xhbmc_size_16_color_FFFFFF_t_70][]
> 
> 查看其中的某一项，比如：/hello/test1
> 
> ![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2ZlaXlpbmcwY2FuZ2xhbmc_size_16_color_FFFFFF_t_70 1][]
> 
> 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

[SpringMVC--_IT_-CSDN]: https://knife.blog.csdn.net/article/details/109517803
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