基本功能和后台联调
1、首页的所有博客
因为是前后台都是本地开发，所以前端vue需要设置proxy：修改/config/index.js中的这个proxyTable
proxyTable: {
‘/api‘: {
target: ‘http://localhost:8888‘,
changeOrigin: true,
pathRewrite: {
‘^/api‘: ‘‘
}
},
同时将mock.js中的模拟数据方法注释掉
2、后台添加cors
package com.nxz.blog.config;
import org.springframework.stereotype.Component;
import javax.servlet.*;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
@Component
public class CorsFilter implements Filter {
final static org.slf4j.Logger logger = org.slf4j.LoggerFactory.getLogger(CorsFilter.class);
public void doFilter(ServletRequest req, ServletResponse res, FilterChain chain) throws IOException, ServletException {
HttpServletResponse response = (HttpServletResponse) res;
HttpServletRequest reqs = (HttpServletRequest) req;
response.setHeader("Access-Control-Allow-Origin", "*");
response.setHeader("Access-Control-Allow-Credentials", "true");
response.setHeader("Access-Control-Allow-Methods", "*");
response.setHeader("Access-Control-Max-Age", "3600");
response.setHeader("Access-Control-Allow-Headers", "x-requested-with");
chain.doFilter(req, res);
}
public void init(FilterConfig filterConfig) {
}
public void destroy() {
}
}
3、添加后台接口
controller
package com.nxz.blog.controller;
import com.nxz.blog.pojo.vo.PostVo;
import com.nxz.blog.service.PostService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import java.util.List;
@RestController
@RequestMapping("posts")
public class PostController {
@Autowired
private PostService postService;
/**
* 获取所有的博客（博客列表展示）
*
* @return
*/
@GetMapping//不设置具体的mapping，会默认“/posts”路径
public List<PostVo> getPostList() {
return postService.getAllPostList();
}
}
service
package com.nxz.blog.service;
import com.nxz.blog.dao.PostDao;
import com.nxz.blog.entity.Post;
import com.nxz.blog.pojo.vo.PostVo;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import java.util.ArrayList;
import java.util.List;
@Service
public class PostService {
@Autowired
private PostDao postDao;
/**
* 获取所有的博客信息
* @return
*/
public List<PostVo> getAllPostList() {
List<PostVo> resList = new ArrayList<>();
List<Post> allPostList = postDao.findAll();
allPostList.stream().forEach(item -> {
PostVo postVo = new PostVo();
BeanUtils.copyProperties(item, postVo);
resList.add(postVo);
});
return resList;
}
}
dao：
package com.nxz.blog.dao;
import com.nxz.blog.entity.Post;
import org.springframework.data.jpa.repository.JpaRepository;
import org.springframework.stereotype.Repository;
@Repository
public interface PostDao extends JpaRepository<Post, Integer> {
}
postvo：
package com.nxz.blog.pojo.vo;
import lombok.Data;
@Data
public class PostVo {
private Integer postId;
private String postTitle;
private String postContent;
private Long createDate;
}
post：
package com.nxz.blog.entity;
import lombok.Data;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
@Entity
@Data
public class Post {
@Id
@GeneratedValue(strategy = GenerationType.IDENTITY)
private Integer postId;
private String postTitle;
private String postContent;
private Long createDate;
private Long updateDate;
}
5、修改后访问首页，可以返回后台模拟的数据
6、修改文章的详情接口
注意：修改post结构是post请求格式，又因为axios发送post格式的请求会有跨域问题，所以后端需要配置一下（好多人都说需要axios发送post跨域请求不支持application/json，需要修改content-type，但是我在开发中并没有修改content-type，json格式也可，只需要修改后台允许跨域即可）
//后台用security安全框架，所以需要配置
@Override
protected void configure(HttpSecurity http) throws Exception {
super.configure(http);
http.authorizeRequests()
.anyRequest().permitAll()
.and().cors()//****
.and().csrf().disable();
}
@Bean
CorsConfigurationSource corsConfigurationSource() {
CorsConfiguration configuration = new CorsConfiguration();
configuration.setAllowedOrigins(Arrays.asList("*"));
configuration.setAllowedMethods(Arrays.asList("GET", "POST","PUT","DELETE"));
UrlBasedCorsConfigurationSource source = new UrlBasedCorsConfigurationSource();
source.registerCorsConfiguration("/**", configuration);
return source;
}
修改post接口：
controller
@RestController
@RequestMapping("posts")
public class PostController {
@Autowired
private PostService postService;
@Autowired
private PostClassService postClassService;
@PostMapping("/post")
public Result createPost(@RequestBody PostDto postDto){
postService.createPost(postDto);
return Result.success();
}
service：
@Autowired
private PostDao postDao;
/**
* 保存一个新建的post
*
* @param postDto
*/
@Override
public void createPost(PostDto postDto) {
Post post = new Post();
BeanUtils.copyProperties(postDto, post);
postDao.save(post);
}
dao：
dao使用的jpaReposiroty默认的save方法，只需要将post对象传入即可，其中post对象中的id有值代表修改，无值代表新建
7、修改post后重新进入，会出现以下情况，html标签会输出到页面上
这时候需要将文本的html内容输出为真正的html标签：
<span v-html="postContent"></span>
修改后：
8、记录一个问题，就是之前postcontent字段数据库用的是varchar类型，简单内容还可以，但是对于博客，需要的是长字段存储，因此数据库改为Text类型
修改post.java
@Entity
@Data
public class Post {
@Id
@GeneratedValue(generator = "system-uuid")
@GenericGenerator(name = "system-uuid", strategy = "uuid")
@Column(length = 32)
private String postId;
private String postTitle;
@Lob//加上之后，因为用的jpa ddl-auto：update 因此重启项目后会自动更新表字段，如果不行的话，删掉表后重启，会自动建表
private String postContent;
private Long createDate;
private Long updateDate;
}
9、修改一个post示例：
原文地址：https://www.cnblogs.com/nxzblogs/p/10990691.html
时间： 2024-08-20 07:29:23