@RestController

public class AATestController {

    @GetMapping("/test")

    public String test(@RequestParam("msg") String msg) {

        return "返回消息：" + msg;

    }

}

@SpringBootTest(classes = ApplicationTest.class)

@ExtendWith(SpringExtension.class)

public class AAControllerTest {

    @Autowired

    private WebApplicationContext webApplicationContext;

    private MockMvc mockMvc;

    @Test

    void aa() throws Exception {

        String url = "/test";

        String msg = "模拟HTTP请求";

        MockHttpServletRequestBuilder builder = MockMvcRequestBuilders.get(url).accept(MediaType.APPLICATION_JSON).param("msg",msg);

        mockMvc = MockMvcBuilders.webAppContextSetup(webApplicationContext).build();

        MvcResult mvcResult = mockMvc.perform(builder).andReturn();

        int status = mvcResult.getResponse().getStatus();

        if (status==200){

            String contentAsString = mvcResult.getResponse().getContentAsString(StandardCharsets.UTF_8);

            System.out.println("contentAsString = " + contentAsString);

        }

    }

}