(一):搭建前后端交互(解决跨域)
后端:
第一步:导入跨域的依赖
com.alibaba
fastjson
1.2.47
第二步:创建跨域类:
package com.kingback.wangxuedi.config;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.cors.CorsConfiguration;
import org.springframework.web.cors.UrlBasedCorsConfigurationSource;
import org.springframework.web.filter.CorsFilter;
@Configuration
public class CorsConfig {
//当前跨越请求最大有效时长,默认为一天
private static final long MAX_AGE = 24*60*60;
@Bean
public CorsFilter corsFilter() {
UrlBasedCorsConfigurationSource source = new UrlBasedCorsConfigurationSource();
CorsConfiguration corsConfiguration = new CorsConfiguration();
corsConfiguration.addAllowedOrigin("*"); // 1 设置访问源地址
corsConfiguration.addAllowedHeader("*"); // 2 设置访问源请求头
corsConfiguration.addAllowedMethod("*"); // 3 设置访问源请求方法
corsConfiguration.setMaxAge(MAX_AGE);
source.registerCorsConfiguration("/**", corsConfiguration); // 4 对接口配置跨域设置
return new CorsFilter(source);
}
}
第三步:创建实体类
package com.kingback.wangxuedi.entity;
import lombok.Data;
@Data
public class Scenic {
private int id;
private String content;
private String name;
private String images;
private String leixing;
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public String getContent() {
return content;
}
public void setContent(String content) {
this.content = content;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getImages() {
return images;
}
public void setImages(String images) {
this.images = images;
}
public String getLeixing() {
return leixing;
}
public void setLeixing(String leixing) {
this.leixing = leixing;
}
@Override
public String toString() {
return "Scenic{" +
"id=" + id +
", content='" + content + '\'' +
", name='" + name + '\'' +
", images='" + images + '\'' +
", leixing='" + leixing + '\'' +
'}';
}
}
第四步:创建mapper接口:
package com.kingback.wangxuedi.mapper;
import com.kingback.wangxuedi.entity.Scenic;
import org.apache.ibatis.annotations.Mapper;
@Mapper
public interface ScenicMapper {
//查询所有的景点
Scenic findByLeixing(String leixing);//通过类型对页面数据进行展示
}
第五步:实现接口方法
第六步:编写Controller层
package com.kingback.wangxuedi.controller;
import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
import com.kingback.wangxuedi.common.Result;
import com.kingback.wangxuedi.entity.Scenic;
import com.kingback.wangxuedi.mapper.ScenicMapper;
import org.springframework.web.bind.annotation.*;
import javax.annotation.Resource;
import java.util.List;
@RestController
public class ScenicController {
@Resource
private ScenicMapper scenicMapper;
@GetMapping("/scenic")
public Result findByName(@RequestParam String leixing){
return Result.success(scenicMapper.findByLeixing(leixing));
}
}
前端:Vue层
第一步:按照axios
npm i axios -S
第二步:引入axios并且编写跨域请求
import axios from 'axios'
import ElementUI from 'element-ui';
const request = axios.create({
baseURL: 'http://localhost:9000', // 注意!! 这里是全局统一加上了 '/api' 前缀,也就是说所有接口都会加上'/api'前缀在,页面里面写接口的时候就不要加 '/api'了,否则会出现2个'/api',类似 '/api/api/user'这样的报错,切记!!!
timeout: 5000
})
// request 拦截器
// 可以自请求发送前对请求做一些处理
// 比如统一加token,对请求参数统一加密
request.interceptors.request.use(config => {
config.headers['Content-Type'] = 'application/json;charset=utf-8';
let user = localStorage.getItem("user") ? JSON.parse(localStorage.getItem("user")):null
// console.log("token为",user.token)
if(user){
config.headers['token'] = user.token; // 设置请求头
}
return config
}, error => {
return Promise.reject(error)
});
// response 拦截器
// 可以在接口响应后统一处理结果
request.interceptors.response.use(
response => {
let res = response.data;
// 如果是返回的文件
if (response.config.responseType === 'blob') {
return res
}
// 兼容服务端返回的字符串数据
if (typeof res === 'string') {
res = res ? JSON.parse(res) : res
}
//当权限验证不通过时,给出提示
if(res.code == '401'){
ElementUI.Message({
message:res.msg,
type:'error'
})
}
return res;
},
error => {
console.log('err' + error) // for debug
return Promise.reject(error)
}
)
export default request
第三步:在main.js中引入封装好的axios
import request from '@/utils/request';
Vue.prototype.request = request;
Vue.config.productionTip = false
第四步:实际使用:进行数据请求
methods: {
load(){
this.request.get("/scenic",{
params:{
leixing:this.leixing
}
}).then(res =>{
console.log(res);
})
}
}