3.02-发布帖子

数局访问层代码编写

package com.nowcoder.community.dao;

import com.nowcoder.community.entity.DiscussPost;
import org.apache.ibatis.annotations.Mapper;
import org.apache.ibatis.annotations.Param;

import java.util.List;

@Mapper
public interface DiscussPostMapper {

    List<DiscussPost> selectDiscussPosts(int userId, int offset, int limit);
    // @Param注解用于给参数取别名,
    // 如果只有一个参数,并且在<if>里使用,则必须加别名.
    int selectDiscussPostRows(@Param("userId") int userId);

    int insertDiscussPost(DiscussPost discussPost);
}

discusspost-mapper.xml

    <insert id="insertDiscussPost" parameterType="DiscussPost">
        insert into discuss_post(<include refid="insertFields"></include>)
        values(#{userId},#{title},#{content},#{type},#{status},#{createTime},#{commentCount},#{score})
    </insert>    

业务层service

package com.nowcoder.community.service;

import com.nowcoder.community.dao.DiscussPostMapper;
import com.nowcoder.community.entity.DiscussPost;
import com.nowcoder.community.util.SensitiveFilter;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.web.util.HtmlUtils;

import java.util.List;

@Service
public class DiscussPostService {

    @Autowired
    private DiscussPostMapper discussPostMapper;

    @Autowired
    private SensitiveFilter sensitiveFilter;

    public int addDiscussPost(DiscussPost post) {
        if (post == null) {
            throw new IllegalArgumentException("参数不能为空!");
        }

        // 转义HTML标记
        post.setTitle(HtmlUtils.htmlEscape(post.getTitle()));
        post.setContent(HtmlUtils.htmlEscape(post.getContent()));
        // 过滤敏感词
        post.setTitle(sensitiveFilter.filter(post.getTitle()));
        post.setContent(sensitiveFilter.filter(post.getContent()));

        return discussPostMapper.insertDiscussPost(post);
    }

}

controller

package com.nowcoder.community.controller;

import com.nowcoder.community.entity.DiscussPost;
import com.nowcoder.community.entity.User;
import com.nowcoder.community.service.DiscussPostService;
import com.nowcoder.community.util.CommunityUtil;
import com.nowcoder.community.util.HostHolder;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.ResponseBody;

import java.util.Date;

@Controller
@RequestMapping("/discuss")
public class DiscussPostController {

    @Autowired
    private DiscussPostService discussPostService;

    @Autowired
    private HostHolder hostHolder;

    @RequestMapping(path = "/add", method = RequestMethod.POST)
    @ResponseBody
    public String addDiscussPost(String title, String content) {
        User user = hostHolder.getUser();
        if (user == null) {
            return CommunityUtil.getJSONString(403, "你还没有登录哦!");
        }

        DiscussPost post = new DiscussPost();
        post.setUserId(user.getId());
        post.setTitle(title);
        post.setContent(content);
        post.setCreateTime(new Date());
        discussPostService.addDiscussPost(post);

        // 报错的情况,将来统一处理.
        return CommunityUtil.getJSONString(0, "发布成功!");
    }

}

　　

页面（视图）

index.html

发布新帖按钮

<button type="button" class="btn btn-primary btn-sm position-absolute rt-0" data-toggle="modal" data-target="#publishModal" th:if="${loginUser!=null}">我要发布</button>

　　

发布新帖表单

<!-- 弹出框 -->
<div class="modal fade" id="publishModal" tabindex="-1" role="dialog" aria-labelledby="publishModalLabel" aria-hidden="true">
	<div class="modal-dialog modal-lg" role="document">
		<div class="modal-content">
			<div class="modal-header">
				<h5 class="modal-title" id="publishModalLabel">新帖发布</h5>
				<button type="button" class="close" data-dismiss="modal" aria-label="Close">
					<span aria-hidden="true">×</span>
				</button>
			</div>
			<div class="modal-body">
				<form>
					<div class="form-group">
						<label for="recipient-name" class="col-form-label">标题：</label>
						<input type="text" class="form-control" id="recipient-name">
					</div>
					<div class="form-group">
						<label for="message-text" class="col-form-label">正文：</label>
						<textarea class="form-control" id="message-text" rows="15"></textarea>
					</div>
				</form>
			</div>
			<div class="modal-footer">
				<button type="button" class="btn btn-secondary" data-dismiss="modal">取消</button>
				<button type="button" class="btn btn-primary" id="publishBtn">发布</button>
			</div>
		</div>
	</div>
</div>
<!-- 提示框 -->
<div class="modal fade" id="hintModal" tabindex="-1" role="dialog" aria-labelledby="hintModalLabel" aria-hidden="true">
	<div class="modal-dialog modal-lg" role="document">
		<div class="modal-content">
			<div class="modal-header">
				<h5 class="modal-title" id="hintModalLabel">提示</h5>
			</div>
			<div class="modal-body" id="hintBody">
				发布完毕!
			</div>
		</div>
	</div>
</div>　　

表单提交相关js代码

index.js

$(function(){
	$("#publishBtn").click(publish);
});

function publish() {
	$("#publishModal").modal("hide");

	// 获取标题和内容
	var title = $("#recipient-name").val();
	var content = $("#message-text").val();
	// 发送异步请求(POST)
	$.post(
	    CONTEXT_PATH + "/discuss/add",
	    {"title":title,"content":content},
	    function(data) {
	        data = $.parseJSON(data);
	        // 在提示框中显示返回消息
	        $("#hintBody").text(data.msg);
	        // 显示提示框
            $("#hintModal").modal("show");
            // 2秒后,自动隐藏提示框
            setTimeout(function(){
                $("#hintModal").modal("hide");
                // 刷新页面
                if(data.code == 0) {
                    window.location.reload();
                }
            }, 2000);
	    }
	);

}

　　

测试效果

 数据表

/*列信息*/-----------

Field          Type          Collation        Null    Key     Default  Extra           Privileges                       Comment                        
-------------  ------------  ---------------  ------  ------  -------  --------------  -------------------------------  -------------------------------
id             int(11)       (NULL)           NO      PRI     (NULL)   auto_increment  select,insert,update,references                                 
user_id        varchar(45)   utf8_general_ci  YES     MUL     (NULL)                   select,insert,update,references                                 
title          varchar(100)  utf8_general_ci  YES             (NULL)                   select,insert,update,references                                 
content        text          utf8_general_ci  YES             (NULL)                   select,insert,update,references                                 
type           int(11)       (NULL)           YES             (NULL)                   select,insert,update,references  0-普通; 1-置顶;            
status         int(11)       (NULL)           YES             (NULL)                   select,insert,update,references  0-正常; 1-精华; 2-拉黑;  
create_time    timestamp     (NULL)           YES             (NULL)                   select,insert,update,references                                 
comment_count  int(11)       (NULL)           YES             (NULL)                   select,insert,update,references                                 
score          double        (NULL)           YES             (NULL)                   select,insert,update,references 

　　

/*索引信息*/--------------

Table         Non_unique  Key_name       Seq_in_index  Column_name  Collation  Cardinality  Sub_part  Packed  Null    Index_type  Comment  Index_comment  
------------  ----------  -------------  ------------  -----------  ---------  -----------  --------  ------  ------  ----------  -------  ---------------
discuss_post           0  PRIMARY                   1  id           A                    1    (NULL)  (NULL)          BTREE                               
discuss_post           1  index_user_id             1  user_id      A                    1    (NULL)  (NULL)  YES     BTREE