TechRoad_oneStep_08/09/2020

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

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

Spring boot web

1. Spring boot context runner

 1 SpringBootApplication
 2 public class PracticeApplication {
 3 
 4     public static void main(String[] args) {
 5 
 6         SpringApplication.run(PracticeApplication.class,args);
 7 
 8 /*
 9       ConfigurableApplicationContext ctx = SpringApplication.run(PracticeApplication.class, args);
10 
11         Calculator calculator = ctx.getBean(Calculator.class);
12         calculator.calculate(123,334,'+');
13         calculator.calculate(123, 123, '*');
14 */
15 
16     }
17 
18 /*    @Bean
19     public ApplicationRunner calculationRunner(Calculator calculator){
20         return args -> {
21             calculator.calculate(124, 123, '+');
22             calculator.calculate(123, 22, '*');
23         };
24     }*/
25 
26 /*    @Bean
27     public ApplicationRunner calculationRunner(Calculator calculator,
28                                                @Value("${lhs : 1}") int lhs,
29                                                @Value("${rhs : 1}") int rhs,
30                                                @Value("${op : '+'}") char op){
31         return args ->{
32             calculator.calculate(lhs, rhs, op);};
33     }*/
34 }

View Code

2. log

3. spring mvc

MockMvc test

 1 package org.techroad.springboot.practice.cp3_springMVC.example;
 2 
 3 import org.junit.jupiter.api.Test;
 4 import org.springframework.beans.factory.annotation.Autowired;
 5 import org.springframework.boot.test.autoconfigure.web.servlet.WebMvcTest;
 6 import org.springframework.boot.test.mock.mockito.MockBean;
 7 import org.springframework.test.web.servlet.MockMvc;
 8 import org.springframework.test.web.servlet.result.MockMvcResultMatchers;
 9 
10 import java.util.Arrays;
11 import java.util.Optional;
12 
13 import static org.hamcrest.collection.IsCollectionWithSize.hasSize;
14 import static org.hamcrest.collection.IsIterableContainingInAnyOrder.containsInAnyOrder;
15 import static org.hamcrest.core.IsEqual.equalTo;
16 
17 import static org.mockito.ArgumentMatchers.anyString;
18 import static org.mockito.Mockito.when;
19 
20 import static org.springframework.test.web.servlet.request.MockMvcRequestBuilders.get;
21 import static org.springframework.test.web.servlet.result.MockMvcResultMatchers.jsonPath;
22 import static org.springframework.test.web.servlet.result.MockMvcResultMatchers.status;
23 
24 @WebMvcTest(BookController.class)
25 class BookControllerTest {
26 
27     @Autowired
28     private MockMvc mockMvc;
29 
30     @MockBean
31     private BookService bookService;
32 
33     @Test
34     public void shouldReturnListOfBooks() throws Exception{
35         when(bookService.findAll()).thenReturn(
36                 Arrays.asList(
37                         new Book("123","Spring 5 Recipes", "Marten denium, Josh long"),
38                         new Book("345","Pro spring mvc","Marten")
39                 )
40         );
41 
42         mockMvc.perform(get("/books"))
43                 .andExpect(status().isOk())
44                 .andExpect(jsonPath("$",hasSize(2)))
45                 .andExpect( jsonPath("$[*].isbn",containsInAnyOrder("123","345")))
46                 .andExpect( jsonPath("$[*].title",containsInAnyOrder("Spring 5 Recipes","Pro spring mvc")));
47     }
48 
49     @Test
50     public void shouldReturn404WhenBookNotFound() throws Exception{
51         when(bookService.find(anyString())).thenReturn(Optional.empty());
52 
53         mockMvc.perform(get("/book/123")).andExpect(
54                 status().isNotFound()
55         );
56     }
57 
58     @Test
59     public void shouldReturnBookWhenFound() throws Exception{
60         when(bookService.find(anyString())).thenReturn(
61                 Optional.of(
62                         new Book("123", "Spring 5 Recipes", "Marten")
63                 )
64         );
65 
66         mockMvc.perform(get("/books/123"))
67                 .andExpect(status().isOk())
68                 .andExpect(jsonPath("$.isbn",equalTo("123")))
69                 .andExpect( jsonPath("$.title",equalTo("Spring 5 Recipes")));
70     }
71 
72 }

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。