第一種：添加@CrossOrigin注解

在Controller層對(duì)應(yīng)的方法上添加@CrossOrigin或者類上添加@CrossOrigin??

package com.example.controller;

import com.example.model.Book;
import com.example.service.InBookService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.*;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpSession;
import java.util.List;
import java.util.Map;

@RestController
@CrossOrigin
public class BookController {

    @Autowired
    private InBookService bookService;

    String message = "";

    @RequestMapping("/queryAllBooks")
    public List<Book> getAllBooks(){

        List<Book> allBooks = bookService.getAllBooks();
        return allBooks;
    }

    @RequestMapping("/addBook")
    public String addBook(@RequestBody Book book){
        //用Mybatis執(zhí)行insert語句的時(shí)候，插入成功會(huì)返回1，不成功則會(huì)拋出異常，捕獲一下異常就好
        try {
            bookService.addBook(book);
            message = "增加用戶成功";
        }catch (Exception exception){
            message = "增加用戶異常";
        }
        return message;
    }

    @RequestMapping("/updateBookById")
    public String updateBook(@RequestBody Book book){
        //用Mybatis執(zhí)行insert語句的時(shí)候，插入成功會(huì)返回1，不成功則會(huì)拋出異常，捕獲一下異常就好
        try {
            bookService.updateBookById(book);
            message = "更新用戶成功";
        }catch (Exception exception){
            message = "更新用戶異常";
        }
        return message;
    }


    @RequestMapping("/deleteBookById")
    public String deleteBookById(@RequestBody Map<String,Integer> params){

        //用Mybatis執(zhí)行insert語句的時(shí)候，插入成功會(huì)返回1，不成功則會(huì)拋出異常，捕獲一下異常就好
        try {
            Integer id = params.get("id");
            bookService.deleteBookById(id);
            message = "刪除用戶成功";
        }catch (Exception exception){
            message = "刪除用戶異常";
        }
        return message;
    }

    @RequestMapping("/getBookById")
    public Book getBookById(@RequestBody Map<String,Integer> params){

        int id = params.get("id");
        Book b = bookService.getBookById(id);
        return b;
    }

}

第二種：添加CORS過濾器

新建配置類CorsConfig，創(chuàng)建CorsFilter過濾器，允許跨域

@Configuration
public class CorsConfig {
    // 跨域請(qǐng)求處理
    @Bean
    public CorsFilter corsFilter() {
        CorsConfiguration config = new CorsConfiguration();
        //允許所有域名進(jìn)行跨域調(diào)用
        config.addAllowedOrigin("*");
        //允許所有請(qǐng)求頭
        config.addAllowedHeader("*");
        //允許所有方法
        config.addAllowedMethod("*");
        // 添加映射路徑，我們攔截一切請(qǐng)求
        UrlBasedCorsConfigurationSource source = new UrlBasedCorsConfigurationSource();
        source.registerCorsConfiguration("/**", config);
        return new CorsFilter(source);
    }
}

?第三種：實(shí)現(xiàn)WebMvcConfigurer，重寫addCorsMappings方法

@Configuration
public class CorsConfig implements WebMvcConfigurer {
    // 跨域請(qǐng)求處理
    @Override
    public void addCorsMappings(CorsRegistry registry) {
        registry
                // 設(shè)置允許跨域的路徑
                .addMapping("/**")
                // 設(shè)置允許跨域請(qǐng)求的域名
                .allowedOriginPatterns("*")
                // 是否允許證書
                .allowCredentials(true)
                // 設(shè)置允許的方法
                .allowedMethods("GET", "POST", "DELETE", "PUT")
                // 設(shè)置允許的header屬性
                .allowedHeaders("*")
                // 跨域允許時(shí)間
                .maxAge(3600);
    }
}

全局配置有可能出現(xiàn)跨域失敗的情況，改為過濾器解決跨域問題之后就解決了，在此附上過濾器跨域代碼：

@Component
public class CorsFilter implements Filter {
 
    //銷毀時(shí)候調(diào)用的方法
    @Override
    public void destroy() {
 
    }
 
    @Override
    public void doFilter(ServletRequest req, ServletResponse res, FilterChain chain)
            throws IOException, ServletException {
 
        HttpServletRequest request = (HttpServletRequest) req;
        HttpServletResponse response = (HttpServletResponse) res;
 
        response.setHeader("Access-Control-Allow-Origin", "*");
        response.setHeader("Access-Control-Allow-Methods", "POST, GET, PUT, DELETE");
        response.setHeader("Access-Control-Max-Age", "3600");
        response.setHeader("Access-Control-Allow-Headers", "*");
 
        chain.doFilter(req, res);
 
    }
 
    //初始化調(diào)用的方法
    //當(dāng)服務(wù)器 被啟動(dòng)的時(shí)候，調(diào)用
    @Override
    public void init(FilterConfig arg0) throws ServletException {
 
    }
}

參考：

Springboot解決跨域問題的三種方式_springboot跨域注解-CSDN博客文章來源地址http://www.zghlxwxcb.cn/news/detail-856588.html

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