下面是“Springboot+ElementUi实现评论、回复、点赞功能”的完整攻略：

简介

本文将介绍如何使用Spring Boot和ElementUi实现评论、回复、点赞功能。在本文中，我们将使用Spring Boot作为后端框架，使用ElementUi作为前端框架。

技术栈

前端技术：Vue.js、ElementUi、Axios
后端技术：Spring Boot、Spring Data JPA、MySQL

实现思路

使用Spring Boot开发后端接口，提供前后端数据传输和持久化能力
使用Vue.js和ElementUi开发前端界面，实现评论、回复、点赞功能
在后端使用Spring Boot提供的RESTful API，前端使用Axios访问API，实现前后端数据交互

开始项目

前端项目初始化

初始化项目

vue init webpack my-project

安装项目依赖

npm install

安装ElementUi和Axios

npm install element-ui axios --save

后端项目初始化

使用Spring Initializr生成新项目，添加JPA、MySQL、Web依赖。
修改项目配置

在application.yml文件中添加MySQL连接信息

spring:
  datasource:
    url: jdbc:mysql://localhost:3306/dbname
    username: username
    password: password

实现评论功能

在后端创建实体类Comment，并使用JPA注解创建数据表。

@Entity
@Table(name = "comments")
public class Comment {

    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private Long id;

    @Column(nullable = false)
    private String content;

    @Column(name = "create_time")
    private Date createTime;

    // 其他字段省略

    // getter和setter方法省略
}

创建后端CommentController类，提供CRUD操作的REST接口。

@RestController
@RequestMapping("/api")
public class CommentController {

    @Autowired
    private CommentRepository commentRepository;

    @PostMapping("/comments")
    public Comment createComment(@RequestBody Comment comment) {
        comment.setCreateTime(new Date());
        return commentRepository.save(comment);
    }

    @GetMapping("/comments")
    public List<Comment> getComments() {
        return commentRepository.findAll();
    }

    // 其他操作省略
}

创建前端CommentList组件，使用ElementUi的表单和列表组件。

<template>
  <div>
    <el-form ref="form" :model="comment" label-width="80px">
      <el-form-item label="内容">
        <el-input v-model="comment.content"></el-input>
      </el-form-item>
      <el-form-item>
        <el-button type="primary" @click="onSubmit">发表评论</el-button>
      </el-form-item>
    </el-form>
    <el-divider></el-divider>
    <el-list>
      <el-list-item v-for="(comment, index) in comments" :key="index">
        <el-card>
          <div slot="header">
            <span>{{comment.createTime}}</span>
            <el-button type="text" size="mini" @click="onLike(index)">{{comment.likeNum}} 赞</el-button>
          </div>
          <p>{{comment.content}}</p>
        </el-card>
      </el-list-item>
    </el-list>
  </div>
</template>

<script>
import axios from 'axios'

export default {
  name: 'CommentList',
  data() {
    return {
      comment: {},
      comments: []
    }
  },
  methods: {
    getComments() {
      axios.get('/api/comments').then(response => {
        this.comments = response.data
      })
    },
    createComment(comment) {
      axios.post('/api/comments', comment).then(response => {
        this.getComments()
        this.comment = {}
      })
    },
    onSubmit() {
      this.createComment(this.comment)
    },
    onLike(index) {
      const comment = this.comments[index]
      comment.likeNum++
      axios.put(`/api/comments/${comment.id}`, comment)
    }
  },
  mounted() {
    this.getComments()
  }
}
</script>

实现回复和点赞功能

在后端创建实体类Reply，并使用JPA注解创建数据表，关联Comment实体。

@Entity
@Table(name = "replies")
public class Reply {

    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private Long id;

    @Column(nullable = false)
    private String content;

    @Column(name = "create_time")
    private Date createTime;

    // 其他字段省略

    @ManyToOne(fetch = FetchType.LAZY)
    @JoinColumn(name = "comment_id", nullable = false)
    private Comment comment;

    // getter和setter方法省略
}

修改Comment实体，添加与Reply实体的关联。

@Entity
@Table(name = "comments")
public class Comment {

    @OneToMany(mappedBy = "comment", cascade = CascadeType.ALL)
    private List<Reply> replies;

    // 其他字段省略

    // getter和setter方法省略
}

在CommentController中添加处理回复的REST接口。

@RestController
@RequestMapping("/api")
public class CommentController {

    // 其他接口省略

    @PostMapping("/comments/{id}/replies")
    public Reply createReply(@PathVariable("id") Long commentId, @RequestBody Reply reply) {
        Comment comment = commentRepository.getById(commentId);
        reply.setCreateTime(new Date());
        reply.setComment(comment);
        return replyRepository.save(reply);
    }
}

在CommentList组件中添加回复和点赞功能。

<template>
  <div>
    <el-form ref="form" :model="comment" label-width="80px">
      <el-form-item label="内容">
        <el-input v-model="comment.content"></el-input>
      </el-form-item>
      <el-form-item>
        <el-button type="primary" @click="onSubmit">发表评论</el-button>
      </el-form-item>
    </el-form>
    <el-divider></el-divider>
    <el-list>
      <el-list-item v-for="(comment, index) in comments" :key="index">
        <el-card>
          <div slot="header">
            <span>{{comment.createTime}}</span>
            <el-button type="text" size="mini" @click="onLike(index)">{{comment.likeNum}} 赞</el-button>
          </div>
          <p>{{comment.content}}</p>
          <el-divider></el-divider>
          <el-form ref="replyForm" :model="reply" label-width="80px">
            <el-form-item label="回复">
              <el-input v-model="reply.content"></el-input>
            </el-form-item>
            <el-form-item>
              <el-button type="primary" @click="onReply(index)">回复</el-button>
            </el-form-item>
          </el-form>
          <el-divider></el-divider>
          <el-list>
            <el-list-item v-for="(reply, index) in comment.replies" :key="index">
              <el-card>
                <div slot="header">
                  <span>{{reply.createTime}}</span>
                </div>
                <p>{{reply.content}}</p>
              </el-card>
            </el-list-item>
          </el-list>
        </el-card>
      </el-list-item>
    </el-list>
  </div>
</template>

<script>
import axios from 'axios'

export default {
  name: 'CommentList',
  data() {
    return {
      comment: {},
      comments: [],
      reply: {}
    }
  },
  methods: {
    getComments() {
      axios.get('/api/comments').then(response => {
        this.comments = response.data
      })
    },
    createComment(comment) {
      axios.post('/api/comments', comment).then(response => {
        this.getComments()
        this.comment = {}
      })
    },
    createReply(commentIndex, reply) {
      const comment = this.comments[commentIndex]
      axios.post(`/api/comments/${comment.id}/replies`, reply).then(response => {
        this.getComments()
        this.reply = {}
        this.$message.success('回复成功')
      })
    },
    onSubmit() {
      this.createComment(this.comment)
    },
    onReply(index) {
      this.createReply(index, this.reply)
    },
    onLike(index) {
      const comment = this.comments[index]
      comment.likeNum++
      axios.put(`/api/comments/${comment.id}`, comment)
    }
  },
  mounted() {
    this.getComments()
  }
}
</script>

以上就是“Springboot+ElementUi实现评论、回复、点赞功能”的完整攻略，包含了评论、回复、点赞功能的实现和部分代码示例。

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Springboot+ElementUi实现评论、回复、点赞功能

简介

技术栈