TechRoad_oneStep_08/09/2020

记录 tech road 点滴的收获, 日后整理的资料 2020-08-09

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1. Spring IoC ，Strategy 的子类实现，在 customer 的setter 参数中 Collection<StrategyInterface>  strategy>

可将所有具体的实现注入。

2. Java8 stream 的 flatMap , 双 map 处理双集合

3 Optional<T> 结合 findAny() , 

isPresent() 返回true或false,

ifPresent ( Consumer<T> block ）会在值存在的时候执行， T 与 Optional<T> 一致。

4, Class Enum 

 

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Spring boot web

1. Spring boot context  runner

SpringBootApplication
public class PracticeApplication {

    public static void main(String[] args) {

        SpringApplication.run(PracticeApplication.class,args);

/*
      ConfigurableApplicationContext ctx = SpringApplication.run(PracticeApplication.class, args);

        Calculator calculator = ctx.getBean(Calculator.class);
        calculator.calculate(123,334,'+');
        calculator.calculate(123, 123, '*');
*/

    }

/*    @Bean
    public ApplicationRunner calculationRunner(Calculator calculator){
        return args -> {
            calculator.calculate(124, 123, '+');
            calculator.calculate(123, 22, '*');
        };
    }*/

/*    @Bean
    public ApplicationRunner calculationRunner(Calculator calculator,
                                               @Value("${lhs : 1}") int lhs,
                                               @Value("${rhs : 1}") int rhs,
                                               @Value("${op : '+'}") char op){
        return args ->{
            calculator.calculate(lhs, rhs, op);};
    }*/
}

2.  log

3. spring mvc

  

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MockMvc test

package org.techroad.springboot.practice.cp3_springMVC.example;

import org.junit.jupiter.api.Test;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.autoconfigure.web.servlet.WebMvcTest;
import org.springframework.boot.test.mock.mockito.MockBean;
import org.springframework.test.web.servlet.MockMvc;
import org.springframework.test.web.servlet.result.MockMvcResultMatchers;

import java.util.Arrays;
import java.util.Optional;

import static org.hamcrest.collection.IsCollectionWithSize.hasSize;
import static org.hamcrest.collection.IsIterableContainingInAnyOrder.containsInAnyOrder;
import static org.hamcrest.core.IsEqual.equalTo;

import static org.mockito.ArgumentMatchers.anyString;
import static org.mockito.Mockito.when;

import static org.springframework.test.web.servlet.request.MockMvcRequestBuilders.get;
import static org.springframework.test.web.servlet.result.MockMvcResultMatchers.jsonPath;
import static org.springframework.test.web.servlet.result.MockMvcResultMatchers.status;

@WebMvcTest(BookController.class)
class BookControllerTest {

    @Autowired
    private MockMvc mockMvc;

    @MockBean
    private BookService bookService;

    @Test
    public void shouldReturnListOfBooks() throws Exception{
        when(bookService.findAll()).thenReturn(
                Arrays.asList(
                        new Book("123","Spring 5 Recipes", "Marten denium, Josh long"),
                        new Book("345","Pro spring mvc","Marten")
                )
        );

        mockMvc.perform(get("/books"))
                .andExpect(status().isOk())
                .andExpect(jsonPath("$",hasSize(2)))
                .andExpect( jsonPath("$[*].isbn",containsInAnyOrder("123","345")))
                .andExpect( jsonPath("$[*].title",containsInAnyOrder("Spring 5 Recipes","Pro spring mvc")));
    }

    @Test
    public void shouldReturn404WhenBookNotFound() throws Exception{
        when(bookService.find(anyString())).thenReturn(Optional.empty());

        mockMvc.perform(get("/book/123")).andExpect(
                status().isNotFound()
        );
    }

    @Test
    public void shouldReturnBookWhenFound() throws Exception{
        when(bookService.find(anyString())).thenReturn(
                Optional.of(
                        new Book("123", "Spring 5 Recipes", "Marten")
                )
        );

        mockMvc.perform(get("/books/123"))
                .andExpect(status().isOk())
                .andExpect(jsonPath("$.isbn",equalTo("123")))
                .andExpect( jsonPath("$.title",equalTo("Spring 5 Recipes")));
    }

}

2. thymeleaf config

resources/templates/  xx.html

模型中包含错误页面的属性

timestamp 错误发生的时间

status 状态代码

error 错误原因

exception 根异常的类名（如果已配置）

message 异常消息

errors  由 BindingResult 产生的任何 ObjectError 对象（仅当使用了消息绑定或消息验证时)

trace 异常堆栈跟踪信息（如果已配置）

path 引发异常的 URL 路径

由 ErrorAttributes 组件提供， SpringBoot 默认 defaultErrorAttributes， 可自定义或扩展。