Vue Cli3 + SpringBoot stepping on the pit (4)

1. Mainly upload pictures:

The first is the front end:
followed by the back end: (I do n’t quite understand it, but I can study later):

package com.example.demo.config;


import org.springframework.boot.SpringBootConfiguration;
import org.springframework.web.servlet.config.annotation.CorsRegistry;
import org.springframework.web.servlet.config.annotation.ResourceHandlerRegistry;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurer;
@SpringBootConfiguration
public class MyWebConfigurer implements WebMvcConfigurer {
    @Override
    public void addCorsMappings(CorsRegistry registry) {
//所有请求都允许跨域，使用这种配置方法就不能在 interceptor 中再配置 header 了
        registry.addMapping("/**")
                .allowCredentials(true)
                .allowedOrigins("http://localhost:8000")
                .allowedMethods("POST", "GET", "PUT", "OPTIONS", "DELETE")
                .allowedHeaders("*")
                .maxAge(3600);
    }

    @Override
    public void addResourceHandlers(ResourceHandlerRegistry registry) {
        registry.addResourceHandler("/api/file/**").addResourceLocations("file:" + "./workspace/img");
    }
}

package com.example.demo.controller;


import com.example.demo.pojo.Book;
import com.example.demo.service.BookService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.*;
import org.springframework.web.multipart.MultipartFile;
import org.springframework.web.util.HtmlUtils;

import java.io.File;
import java.io.IOException;
import java.util.List;
import java.util.Random;

//此层主要进行对页面的处理，包括跳转或者传参等等。
@RestController
public class BookController {
    @Autowired
    BookService bookService;
//按标题查找文章
//    跨域注解
    @CrossOrigin
    @PostMapping("/FindTitle")
    public List<Book> list(@RequestBody Book book) throws Exception {
        int num = book.getId();
        return bookService.FindById(num);
    }
//获取数据库所有信息
    @CrossOrigin
    @GetMapping("/FindAll")
    public List<Book> list_1() throws Exception{
        return  bookService.getAll();
    }

//    从前端获取数据添加到数据库
    @CrossOrigin
    @PostMapping("/AddOrUpdate")
    public Book addOrUpdate(@RequestBody Book book) throws Exception{
        bookService.addOrUpdate(book);
        return book;
    }
//    从前端获取数据删除数据库对应id的数据
    @CrossOrigin
    @PostMapping("/DeleteById")
    public void deleteTable(@RequestBody Book book) throws Exception{
        bookService.deleteTable(book.getId());
    }

//上传图片
    public String getRandomString(int length) {
        String base = "abcdefghijklmnopqrstuvwxyz0123456789";
        Random random = new Random();
        StringBuffer sb = new StringBuffer();
        for (int i = 0; i < length; i++) {
            int number = random.nextInt(base.length());
            sb.append(base.charAt(number));
        }
        return sb.toString();
    }
    @CrossOrigin
    @PostMapping("/api/admin/content/books/covers")
    public String coversUpload(MultipartFile file) throws Exception {
//        String folder = "D:/workspace/img";
//        这里涉及到对文件的操作，对接收到的文件重命名，但保留原始的格式。可以进一步做一下压缩，或者校验前端传来的数据是否为指定格式，这里不再赘述。.
//用相对路径
        String folder = "./workspace/img";
        File imageFolder = new File(folder);
        // // 把imageFolder作为父目录创建文件对象
        File f = new File(imageFolder.getAbsolutePath(), getRandomString(6) + file.getOriginalFilename()
                .substring(file.getOriginalFilename().length() - 4));
        ////以文件形式返回获取所在文件夹 //文件是否存在
        if (!f.getParentFile().exists())
            f.getParentFile().mkdirs();////以文件形式返回获取所在文件夹  // 创建文件夹，如果父文件夹skin不存在，就会创建父文件
        try {
//            使用file.transferTo(tempFile)保存文件
            file.transferTo(f);
            String imgURL = "http://localhost:8000/api/file/" + f.getName()+f.getAbsolutePath();
            return imgURL;
        } catch (IOException e) {
            e.printStackTrace();
            return "";
        }
    }


}

Thanks to this blogger for his super useful blog post !

2. Use of the search box:

The front-end logic is: after searching the content, jump to the article list, and the search box passes the value by routing: the

received page is:

if a switch is used to solve the routing refresh problem:


refer to the article

The backend accesses the database with like match: