[Java知识库]Springboot+Vue实现公告功能

普通文本公告

1. 创建数据库表 notice

CREATE TABLE `notice` (
  `id` int(11) NOT NULL AUTO_INCREMENT,
  `name` varchar(255) COLLATE utf8mb4_unicode_ci DEFAULT NULL COMMENT '标题',
  `content` text COLLATE utf8mb4_unicode_ci COMMENT '内容',
  `time` varchar(255) COLLATE utf8mb4_unicode_ci DEFAULT NULL COMMENT '发布时间',
  `user` varchar(255) COLLATE utf8mb4_unicode_ci DEFAULT NULL COMMENT '发布人',
  `img` varchar(255) COLLATE utf8mb4_unicode_ci DEFAULT NULL COMMENT '封面',
  `type` int(1) DEFAULT NULL COMMENT '1-简单的公告，2富文本',
  PRIMARY KEY (`id`)
) ENGINE=InnoDB AUTO_INCREMENT=11 DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;

2. 写Java后台的增删改查

Notice.java

package com.example.springboot.entity;

import com.baomidou.mybatisplus.annotation.IdType;
import com.baomidou.mybatisplus.annotation.TableId;
import java.io.Serializable;
import io.swagger.annotations.ApiModel;
import io.swagger.annotations.ApiModelProperty;
import lombok.Getter;
import lombok.Setter;

/**
 * <p>
 * 
 * </p>
 *
 * @author 
 * @since 2022-04-30
 */
@Getter
@Setter
@ApiModel(value = "Notice对象", description = "")
public class Notice implements Serializable {

    private static final long serialVersionUID = 1L;

    @TableId(value = "id", type = IdType.AUTO)
    private Integer id;

    @ApiModelProperty("标题")
    private String name;

    @ApiModelProperty("内容")
    private String content;

    @ApiModelProperty("发布时间")
    private String time;

    @ApiModelProperty("发布人")
    private String user;

    @ApiModelProperty("封面")
    private String img;

    private Integer type;


}

NoticeController.java

package com.example.springboot.controller;

import cn.hutool.core.date.DateUtil;
import cn.hutool.poi.excel.ExcelUtil;
import cn.hutool.poi.excel.ExcelReader;
import cn.hutool.poi.excel.ExcelWriter;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.ServletOutputStream;
import java.net.URLEncoder;
import com.baomidou.mybatisplus.extension.plugins.pagination.Page;
import org.springframework.web.bind.annotation.*;
import javax.annotation.Resource;
import java.io.InputStream;
import java.util.List;
import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
import com.example.springboot.common.Result;
import org.springframework.web.multipart.MultipartFile;
import com.example.springboot.entity.User;
import com.example.springboot.utils.TokenUtils;

import com.example.springboot.service.INoticeService;
import com.example.springboot.entity.Notice;

import org.springframework.web.bind.annotation.RestController;

/**
 * <p>
 *  前端控制器
 * </p>
 *
 * @author 
 * @since 2022-04-30
 */
@RestController
@RequestMapping("/notice")
public class NoticeController {

    @Resource
    private INoticeService noticeService;

    private final String now = DateUtil.now();

    // 新增或者更新
    @PostMapping
    public Result save(@RequestBody Notice notice) {
        if (notice.getId() == null) {
            notice.setTime(DateUtil.now());
            notice.setUser(TokenUtils.getCurrentUser().getNickname());
        }
        noticeService.saveOrUpdate(notice);
        return Result.success();
    }

    @DeleteMapping("/{id}")
    public Result delete(@PathVariable Integer id) {
        noticeService.removeById(id);
        return Result.success();
    }

    @PostMapping("/del/batch")
    public Result deleteBatch(@RequestBody List<Integer> ids) {
        noticeService.removeByIds(ids);
        return Result.success();
    }

    @GetMapping
    public Result findAll() {
        return Result.success(noticeService.list());
    }

    /**
     * 根据类型查询公告
     * @param type
     * @return
     */
    @GetMapping("/type/{type}")
    public Result findByType(@PathVariable Integer type) {
        QueryWrapper<Notice> queryWrapper = new QueryWrapper<>();
        queryWrapper.eq("type", type);
        return Result.success(noticeService.list(queryWrapper));
    }

    @GetMapping("/{id}")
    public Result findOne(@PathVariable Integer id) {
        return Result.success(noticeService.getById(id));
    }

    @GetMapping("/page")
    public Result findPage(@RequestParam(defaultValue = "") String name,
                           @RequestParam(required = false) Integer type,
                           @RequestParam Integer pageNum,
                           @RequestParam Integer pageSize) {
        QueryWrapper<Notice> queryWrapper = new QueryWrapper<>();
        queryWrapper.orderByDesc("id");
        queryWrapper.eq("type", type);
        if (!"".equals(name)) {
            queryWrapper.like("name", name);
        }
//        User currentUser = TokenUtils.getCurrentUser();
//        if (currentUser.getRole().equals("ROLE_USER")) {
//            queryWrapper.eq("user", currentUser.getUsername());
//        }
        return Result.success(noticeService.page(new Page<>(pageNum, pageSize), queryWrapper));
    }

    /**
    * 导出接口
    */
    @GetMapping("/export")
    public void export(HttpServletResponse response) throws Exception {
        // 从数据库查询出所有的数据
        List<Notice> list = noticeService.list();
        // 在内存操作，写出到浏览器
        ExcelWriter writer = ExcelUtil.getWriter(true);

        // 一次性写出list内的对象到excel，使用默认样式，强制输出标题
        writer.write(list, true);

        // 设置浏览器响应的格式
        response.setContentType("application/vnd.openxmlformats-officedocument.spreadsheetml.sheet;charset=utf-8");
        String fileName = URLEncoder.encode("Notice信息表", "UTF-8");
        response.setHeader("Content-Disposition", "attachment;filename=" + fileName + ".xlsx");

        ServletOutputStream out = response.getOutputStream();
        writer.flush(out, true);
        out.close();
        writer.close();

        }

    /**
     * excel 导入
     * @param file
     * @throws Exception
     */
    @PostMapping("/import")
    public Result imp(MultipartFile file) throws Exception {
        InputStream inputStream = file.getInputStream();
        ExcelReader reader = ExcelUtil.getReader(inputStream);
        // 通过 javabean的方式读取Excel内的对象，但是要求表头必须是英文，跟javabean的属性要对应起来
        List<Notice> list = reader.readAll(Notice.class);

        noticeService.saveBatch(list);
        return Result.success();
    }

    private User getUser() {
        return TokenUtils.getCurrentUser();
    }

}

写前台Vue

<template>
  <div style="color: #666;font-size: 14px;">
    <div style="padding-bottom: 20px">
      <b>您好！{{ user.nickname }}</b>
    </div>
    <el-card>
      欢迎使用本系统
      <el-divider />
      虎虎生威，虎年大吉
    </el-card>

    <el-card style="margin: 10px 0">
      <div style="padding-bottom: 20px; font-size: 24px">简 单 的 系 统 公 告</div>
      <el-collapse accordion v-model="activeNames" v-for="(item, index) in notice">
        <el-collapse-item :name="index + ''">
          <template slot="title">
            <span style="font-size: 20px; color: #E6A23C">{{ item.name }}</span><i style="color: #E6A23C" class="header-icon el-icon-info"></i>
            <span style="margin-left: 20px">{{ item.time }}</span>
          </template>
          <div>
            <div style="padding: 10px 0"><el-image :src="item.img"></el-image></div>
            <div>{{ item.content }}</div>
          </div>
        </el-collapse-item>
      </el-collapse>
    </el-card>

    <el-card style="margin: 10px 0">
      <div style="padding-bottom: 20px; font-size: 24px">富 文 本 的 系 统 公 告</div>
      <el-collapse accordion v-for="(item, index) in noticeRich">
        <el-collapse-item :name="index + ''">
          <template slot="title">
            <span style="font-size: 20px; color: #E6A23C">{{ item.name }}</span><i style="color: #E6A23C" class="header-icon el-icon-info"></i>
            <span style="margin-left: 20px">{{ item.time }}</span>
          </template>
          <div>
            <div style="padding: 10px 0"><el-image :src="item.img"></el-image></div>
            <div v-html="item.content"></div>
          </div>
        </el-collapse-item>
      </el-collapse>
    </el-card>

  </div>
</template>

<script>
export default {
  name: "Home",
  data() {
    return {
      activeNames: ['0'],
      user: localStorage.getItem("user") ? JSON.parse(localStorage.getItem("user")) : {},
      notice: [],
      noticeRich: [],
    }
  },
  created() {
    // 简单公告
    this.request.get("/notice/type/1").then(res => {
      this.notice = res.data.splice(0, 5)
    })

    this.request.get("/notice/type/2").then(res => {
      this.noticeRich = res.data.splice(0, 5)
    })
  }
}
</script>

富文本公告

wangeditoe V4: https://www.wangeditor.com/v4/

1. vue安装wangeditor组件：

npm i wangeditor --save

2. 使用

<template>
  <div>
    <div style="margin: 10px 0">
      <el-input style="width: 200px" placeholder="请输入名称" suffix-icon="el-icon-search" v-model="name"></el-input>
<!--      <el-input style="width: 200px" placeholder="请输入" suffix-icon="el-icon-message" class="ml-5" v-model="email"></el-input>-->
<!--      <el-input style="width: 200px" placeholder="请输入" suffix-icon="el-icon-position" class="ml-5" v-model="address"></el-input>-->
      <el-button class="ml-5" type="primary" @click="load">搜索</el-button>
      <el-button type="warning" @click="reset">重置</el-button>
    </div>

    <div style="margin: 10px 0">
      <el-button type="primary" @click="handleAdd">新增 <i class="el-icon-circle-plus-outline"></i></el-button>
      <el-popconfirm
          class="ml-5"
          confirm-button-text='确定'
          cancel-button-text='我再想想'
          icon="el-icon-info"
          icon-color="red"
          title="您确定批量删除这些数据吗？"
          @confirm="delBatch"
      >
        <el-button type="danger" slot="reference">批量删除 <i class="el-icon-remove-outline"></i></el-button>
      </el-popconfirm>
      <!-- <el-upload action="http://localhost:9090/notice/import" :show-file-list="false" accept="xlsx" :on-success="handleExcelImportSuccess" style="display: inline-block">
        <el-button type="primary" class="ml-5">导入 <i class="el-icon-bottom"></i></el-button>
      </el-upload>
      <el-button type="primary" @click="exp" class="ml-5">导出 <i class="el-icon-top"></i></el-button> -->
    </div>

    <el-table :data="tableData" border stripe :header-cell-class-name="'headerBg'"  @selection-change="handleSelectionChange">
      <el-table-column type="selection" width="55"></el-table-column>
      <el-table-column prop="id" label="ID" width="80" sortable></el-table-column>
      <el-table-column prop="name" label="标题"></el-table-column>
      <el-table-column prop="content" label="内容">
        <template v-slot="scope">
          <el-button type="primary" @click="view(scope.row.content)">查看内容</el-button>
        </template>
      </el-table-column>
      <el-table-column prop="time" label="发布时间"></el-table-column>
      <el-table-column prop="user" label="发布人"></el-table-column>
      <el-table-column label="图片"><template slot-scope="scope"><el-image style="width: 100px; height: 100px" :src="scope.row.img" :preview-src-list="[scope.row.img]"></el-image></template></el-table-column>

      <el-table-column label="操作"  width="180" align="center">
        <template slot-scope="scope">
          <el-button type="success" @click="handleEdit(scope.row)">编辑 <i class="el-icon-edit"></i></el-button>
          <el-popconfirm
              class="ml-5"
              confirm-button-text='确定'
              cancel-button-text='我再想想'
              icon="el-icon-info"
              icon-color="red"
              title="您确定删除吗？"
              @confirm="del(scope.row.id)"
          >
            <el-button type="danger" slot="reference">删除 <i class="el-icon-remove-outline"></i></el-button>
          </el-popconfirm>
        </template>
      </el-table-column>
    </el-table>
    <div style="padding: 10px 0">
      <el-pagination
          @size-change="handleSizeChange"
          @current-change="handleCurrentChange"
          :current-page="pageNum"
          :page-sizes="[2, 5, 10, 20]"
          :page-size="pageSize"
          layout="total, sizes, prev, pager, next, jumper"
          :total="total">
      </el-pagination>
    </div>

    <el-dialog title="信息" :visible.sync="dialogFormVisible" width="60%" :close-on-click-modal="false">
      <el-form label-width="100px" size="small" style="width: 90%">
        <el-form-item label="标题">
          <el-input v-model="form.name" autocomplete="off"></el-input>
        </el-form-item>
        <el-form-item label="封面">
          <el-upload
              class="avatar-uploader"
              action="http://localhost:9090/file/upload"
              ref="img"
              :show-file-list="false"
              :on-success="handleImgUploadSuccess">
            <img v-if="form.img" :src="form.img" class="avatar">
            <i v-else class="el-icon-plus avatar-uploader-icon"></i>
          </el-upload>
        </el-form-item>
        <el-form-item label="内容">
          <div id="richText"></div>
        </el-form-item>

      </el-form>
      <div slot="footer" class="dialog-footer">
        <el-button @click="dialogFormVisible = false">取 消</el-button>
        <el-button type="primary" @click="save">确 定</el-button>
      </div>
    </el-dialog>

    <el-dialog title="内容" :visible.sync="dialogFormVisible1" width="60%" :close-on-click-modal="false">
      <el-card>
        <div v-html="content"></div>
      </el-card>
    </el-dialog>
  </div>
</template>

<script>
import E from "wangeditor"
let editor;
export default {
  name: "Notice",
  data() {
    return {
      tableData: [],
      total: 0,
      pageNum: 1,
      pageSize: 10,
      name: "",
      form: {},
      dialogFormVisible: false,
      dialogFormVisible1: false,
      content: '',
      multipleSelection: [],
      user: localStorage.getItem("user") ? JSON.parse(localStorage.getItem("user")) : {}
    }
  },
  created() {
    this.load()
  },
  methods: {
    view(content) {
      this.content = content
      this.dialogFormVisible1 = true
    },
    load() {
      this.request.get("/notice/page", {
        params: {
          pageNum: this.pageNum,
          pageSize: this.pageSize,
          name: this.name,
          type: 2
        }
      }).then(res => {
        this.tableData = res.data.records
        this.total = res.data.total
      })
    },
    save() {
      const content = editor.txt.html()
      console.log(content)
      // 注意：这个地方需要手动赋值
      this.form.content = content
      this.form.type = 2
      this.request.post("/notice", this.form).then(res => {
        if (res.code === '200') {
          this.$message.success("保存成功")
          this.dialogFormVisible = false
          this.load()
        } else {
          this.$message.error("保存失败")
        }
      })
    },
    handleAdd() {
      this.dialogFormVisible = true
      this.form = {img: ''}
      this.$nextTick(() => {
        if(!editor) {
          editor = new E("#richText")
          editor.config.uploadImgServer = 'http://localhost:9090/file/uploadImg'
          editor.config.uploadFileName = 'file'
          editor.create()
        }
        editor.txt.html('')  // 清除内容

        if(this.$refs.img) {
           this.$refs.img.clearFiles();
         }
         if(this.$refs.file) {
          this.$refs.file.clearFiles();
         }
      })
    },
// {
//   "errno": 0,
//     "data": [
    //   {
    //     url: "图片地址"
    //   }
//   ]
// }
    handleEdit(row) {
      this.form = JSON.parse(JSON.stringify(row))
      this.dialogFormVisible = true
       this.$nextTick(() => {
         if(!editor) {
           editor = new E("#richText")
           editor.config.uploadImgServer = 'http://localhost:9090/file/uploadImg'
           editor.config.uploadFileName = 'file'
           editor.create()
         }
         editor.txt.html(this.form.content)
         if(this.$refs.img) {
           this.$refs.img.clearFiles();
         }
         if(this.$refs.file) {
          this.$refs.file.clearFiles();
         }
       })
    },
    del(id) {
      this.request.delete("/notice/" + id).then(res => {
        if (res.code === '200') {
          this.$message.success("删除成功")
          this.load()
        } else {
          this.$message.error("删除失败")
        }
      })
    },
    handleSelectionChange(val) {
      console.log(val)
      this.multipleSelection = val
    },
    delBatch() {
      if (!this.multipleSelection.length) {
        this.$message.error("请选择需要删除的数据")
        return
      }
      let ids = this.multipleSelection.map(v => v.id)  // [{}, {}, {}] => [1,2,3]
      this.request.post("/notice/del/batch", ids).then(res => {
        if (res.code === '200') {
          this.$message.success("批量删除成功")
          this.load()
        } else {
          this.$message.error("批量删除失败")
        }
      })
    },
    reset() {
      this.name = ""
      this.load()
    },
    handleSizeChange(pageSize) {
      console.log(pageSize)
      this.pageSize = pageSize
      this.load()
    },
    handleCurrentChange(pageNum) {
      console.log(pageNum)
      this.pageNum = pageNum
      this.load()
    },
    handleFileUploadSuccess(res) {
      this.form.file = res
    },
    handleImgUploadSuccess(res) {
      this.form.img = res
    },
    download(url) {
      window.open(url)
    },
    exp() {
      window.open("http://localhost:9090/notice/export")
    },
    handleExcelImportSuccess() {
      this.$message.success("导入成功")
      this.load()
    }
  }
}
</script>


<style>
.headerBg {
  background: #eee!important;
}

.avatar-uploader .el-upload {
  border: 1px dashed #d9d9d9;
  border-radius: 6px;
  cursor: pointer;
  position: relative;
  overflow: hidden;
}
.avatar-uploader .el-upload:hover {
  border-color: #409EFF;
}
.avatar-uploader-icon {
  font-size: 28px;
  color: #8c939d;
  width: 178px;
  height: 178px;
  line-height: 178px;
  text-align: center;
}
.avatar {
  width: 178px;
  height: 178px;
  display: block;
}
</style>

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