6.3 Spring Boot集成mongodb开发

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6.3 Spring Boot集成mongodb开发

本章我们通过SpringBoot集成mongodb，Java，Kotlin开发一个极简社区文章博客系统。

0 mongodb简介

Mongo 的主要目标是在键/值存储方式（提供了高性能和高度伸缩性）和传统的RDBMS 系统（具有丰富的功能）之间架起一座桥梁，它集两者的优势于一身。Mongo 的BSON 数据格式非常适合文档化格式的存储及查询。[1]

关于nosql和rdbms的对比以及选择，我参考了不少资料，关键一点在于：nosql可以轻易扩展表的列，对于业务快速变化的应用场景非常适合；rdbms则需要安装关系型数据库模式对业务进行建模，适合业务场景已经成熟的系统。我目前的这个项目——dailyReport，我暂时没法确定的是，对于一个report，它的属性应该有哪些：date、title、content、address、images等等，基于此我选择mongodb作为该项目的持久化存储。

1 系统基本功能

1.支持markdown编辑器
2.写文章，编辑文章，阅读文章基础博客功能
3.文章列表排序，搜索

2 系统技术框架

开发环境：

MacOS Sierra
IDEA 2017.1
JDK 1.8.0_40
mongod-3.2.4
Gradle 3.5-rc-2

后端：

开发语言：Java 混合Kotlin语言开发

开发框架：

kotlin，Version = '1.1.0'
SpringBoot，Version = '1.5.2.RELEASE'
Spring-data-mongodb

前端：

javascript、html、css
requirejs
jquery
bootstrap
dataTables
meditor

3 系统架构设计

领域模型

Blog

前后端分层

后端Controller

jsp

4 数据库环境配置

1.build.gradle配置

添加mongodb starter

compile('org.springframework.boot:spring-boot-starter-data-jpa')
compile('org.springframework.boot:spring-boot-starter-data-mongodb')

添加mongo-java-driver

compile('org.mongodb:mongo-java-driver:3.4.2')

完整配置如下：

group = 'com.restfeel'
version = '0.0.1-SNAPSHOT'
description = ""

apply 
    plugin "kotlin"
    plugin "kotlin-spring"
    plugin "kotlin-jpa"
    plugin "org.springframework.boot"
    plugin 'java'
    plugin 'eclipse'
    plugin 'idea'
    plugin 'war'
    plugin 'maven'


sourceCompatibility = 1.8
targetCompatibility = 1.8

sourceSets 
    main 
        kotlin  srcDir "src/main/kotlin" 
        java  srcDir "src/main/java" 
    
    test 
        kotlin  srcDir "src/test/kotlin" 
        java  srcDir "src/test/java" 
    


jar 
    baseName = 'restfeel'
    version = '0.0.1'


buildscript 
    ext 
        kotlinVersion = '1.1.0'
        springBootVersion = '1.5.2.RELEASE'
    

    dependencies 
        classpath "org.springframework.boot:spring-boot-gradle-plugin:$springBootVersion"
        classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlinVersion"
        classpath "org.jetbrains.kotlin:kotlin-noarg:$kotlinVersion"
        classpath "org.jetbrains.kotlin:kotlin-allopen:$kotlinVersion"
    

    repositories 
        mavenLocal()
        mavenCentral()
        maven  url "http://oss.jfrog.org/artifactory/oss-release-local" 
        maven  url "http://jaspersoft.artifactoryonline.com/jaspersoft/jaspersoft-repo/" 
        maven  url "https://oss.sonatype.org/content/repositories/snapshots" 

    


dependencies 
    compile("org.jetbrains.kotlin:kotlin-stdlib:$kotlinVersion")
    compile("org.jetbrains.kotlin:kotlin-reflect:$kotlinVersion")
    compile("com.fasterxml.jackson.module:jackson-module-kotlin:2.8.4")

    compile('org.springframework.boot:spring-boot-starter')
    compile('org.springframework.boot:spring-boot-starter-data-jpa')
    compile('org.springframework.boot:spring-boot-starter-data-mongodb')
    compile('org.springframework.boot:spring-boot-starter-actuator')
    compile('org.springframework.boot:spring-boot-starter-web')
    compile('org.springframework.boot:spring-boot-starter-security')
    compile('org.springframework.boot:spring-boot-starter-remote-shell')
    compile('org.springframework.boot:spring-boot-starter-aop')
    providedCompile('org.springframework.boot:spring-boot-starter-tomcat')
    compile('javax.servlet:jstl')
    providedCompile('org.apache.tomcat.embed:tomcat-embed-jasper')

    //thymeleaf
//    compile("org.springframework.boot:spring-boot-starter-thymeleaf")

    compile('org.hibernate:hibernate-validator:5.1.3.Final')
    compile('org.mongodb:mongo-java-driver:3.4.2')
    compile('org.hsqldb:hsqldb:2.3.2')

    compile('org.apache.httpcomponents:httpclient:4.5.1')
    compile('org.apache.httpcomponents:httpmime:4.5.1')
    compile('org.apache.commons:commons-lang3:3.3.2')
    compile('com.sendgrid:sendgrid-java:2.1.0')
    compile('com.ryantenney.metrics:metrics-spring:3.0.0')
    compile('net.sf.jasperreports:jasperreports:6.0.0') 
        exclude module: 'jdtcore'
        exclude module: 'jackson-annotations'
    
    compile('com.mangofactory:swagger-springmvc:0.9.4')
    compile('org.ajar:swagger-spring-mvc-ui:0.4')
    compile('com.google.oauth-client:google-oauth-client:1.19.0')
    compile('com.jayway.jsonpath:json-path:2.0.0')
    compile('io.swagger:swagger-compat-spec-parser:1.0.12')
    compile('org.raml:raml-parser:0.8.12') 
        exclude module: 'slf4j-log4j12'
        exclude module: 'log4j'
    

    testCompile('org.springframework.boot:spring-boot-starter-test')
    // https://mvnrepository.com/artifact/org.springframework.boot/spring-boot-devtools
    compile group: 'org.springframework.boot', name: 'spring-boot-devtools'



compileJava 
    //options.fork = true
    options.incremental = true


repositories 
    mavenLocal()
    mavenCentral()
    maven  url "http://oss.jfrog.org/artifactory/oss-release-local" 
    maven  url "http://jaspersoft.artifactoryonline.com/jaspersoft/jaspersoft-repo/" 
    maven  url "https://oss.sonatype.org/content/repositories/snapshots"

2.实现AbstractMongoConfiguration类

package com.restfeel.config

import com.mongodb.Mongo
import com.mongodb.MongoClient
import com.mongodb.MongoCredential
import com.mongodb.ServerAddress
import org.springframework.beans.factory.annotation.Autowired
import org.springframework.context.annotation.Bean
import org.springframework.context.annotation.Configuration
import org.springframework.core.env.Environment
import org.springframework.data.mongodb.config.AbstractMongoConfiguration
import org.springframework.data.mongodb.repository.config.EnableMongoRepositories

/**
 * Created by jack on 2017/3/29.
 */


@Configuration
@EnableMongoRepositories(*arrayOf("com.restfeel.dao", "com.restfeel.service"))
class PersistenceConfig : AbstractMongoConfiguration() 

    @Autowired
    private val env: Environment? = null

    override fun getDatabaseName(): String 
        return env!!.getProperty("mongodb.name")
    


    @Bean
    @Throws(Exception::class)
    override fun mongo(): Mongo 
        return MongoClient(listOf(ServerAddress(env!!.getProperty("mongodb.host"), env!!.getProperty("mongodb.port", Int::class.java))),
                listOf(MongoCredential
                        .createCredential(env!!.getProperty("mongodb.username"), env!!.getProperty("mongodb.name"),
                                env!!.getProperty("mongodb.password").toCharArray())))
    

//    override fun getMappingBasePackage(): String 
//        return "com.restfiddle.dao"
//    

    /**
     * 这地方是配置扫描继承Repository类的所有接口类的路径的，路径配置错误，bean就不会创建了。
     * 东海陈光剑 Jason Chen @蒋村花园如意苑 2017.3.30 01:41:35
     */
    override fun getMappingBasePackages(): Collection<String> 
        return setOf("com.restfeel.dao", "com.restfeel.service")

5 定义领域对象

领域模型类

package com.restfeel.entity

import org.bson.types.ObjectId
import org.springframework.data.mongodb.core.mapping.Document
import java.util.*
import javax.persistence.GeneratedValue
import javax.persistence.GenerationType
import javax.persistence.Id
import javax.persistence.Version

@Document(collection = "blog") // 如果不指定collection，默认遵从命名规则
class Blog 
    @Id
    @GeneratedValue(strategy = GenerationType.AUTO)
    var id: String = ObjectId.get().toString()
    @Version
    var version: Long = 0
    var title: String = ""
    var content: String = ""
    var author: String = ""
    var gmtCreated: Date = Date()
    var gmtModified: Date = Date()
    var isDeleted: Int = 0 //1 Yes 0 No
    var deletedDate: Date = Date()
    override fun toString(): String 
        return "Blog(id='$id', version=$version, title='$title', content='$content', author='$author', gmtCreated=$gmtCreated, gmtModified=$gmtModified, isDeleted=$isDeleted, deletedDate=$deletedDate)"

6 核心业务逻辑实现

BlogService代码：

package com.restfeel.service

import com.restfeel.entity.Blog
import org.springframework.data.mongodb.repository.MongoRepository
import org.springframework.data.mongodb.repository.Query
import org.springframework.data.repository.query.Param

interface BlogService : MongoRepository<Blog, String> 

    @Query(" 'title' : ?0 ")
    fun findByTitle(@Param("title") title: String): Iterable<Blog>

这里是精确匹配查询。我们一般在实际应用场景中会使用模糊查询。我们简单讲讲mongo的模糊查询。

LIKE模糊查询title包含A字母的数据(%A%)

SQL:

SELECT * FROM Blog WHERE title LIKE "%A%"

MongoDB:

db.Blog.find(title :/A/)

这是mongo里面的正则表达式。等同于

db.Blog.find(title :$regex:"A")

LIKE模糊查询title以字母A开头的数据(A%)

SQL:

SELECT * FROM Blog WHERE title LIKE "A%"

MongoDB:

db.Blog.find(title :/^A/)

如果我们使用org.springframework.data.mongodb.repository.Query，不能直接这么写：title :/^A/。我们需要使用regex表达式来写。代码示例如下：

package com.restfeel.service

import com.restfeel.entity.Blog
import org.springframework.data.mongodb.repository.MongoRepository
import org.springframework.data.mongodb.repository.Query
import org.springframework.data.repository.query.Param

interface BlogService : MongoRepository<Blog, String> 

//    @Query(value = " 'title' : ?0")
    @Query(value = " 'title' : \\$regex: ?0, \\$options: 'i'")
    fun findByTitle(@Param("title") title: String): Iterable<Blog>

我们这里设置 $options 为 $i，意思是检索不区分大小写。

BlogController代码：

package com.restfeel.controller

import com.restfeel.entity.Blog
import com.restfeel.service.BlogService
import org.springframework.boot.autoconfigure.EnableAutoConfiguration
import org.springframework.context.annotation.ComponentScan
import org.springframework.security.core.context.SecurityContextHolder
import org.springframework.security.core.userdetails.UserDetails
import org.springframework.stereotype.Controller
import org.springframework.transaction.annotation.Propagation
import org.springframework.transaction.annotation.Transactional
import org.springframework.ui.Model
import org.springframework.web.bind.annotation.GetMapping
import org.springframework.web.bind.annotation.PostMapping
import org.springframework.web.bind.annotation.RequestParam
import org.springframework.web.bind.annotation.ResponseBody
import java.util.*
import javax.servlet.http.HttpServletRequest

/**
 * 文章列表，写文章的Controller
 * @author Jason Chen  2017/3/31 01:10:16
 */

@Controller
@EnableAutoConfiguration
@ComponentScan
@Transactional(propagation = Propagation.REQUIRES_NEW)
class BlogController(val blogService: BlogService) 
    @GetMapping("/blogs.do")
    fun listAll(model: Model): String 
        val authentication = SecurityContextHolder.getContext().authentication
        model.addAttribute("currentUser", if (authentication == null) null else authentication.principal as UserDetails)
        val allblogs = blogService.findAll()
        model.addAttribute("blogs", allblogs)
        return "jsp/blog/list"
    

    @PostMapping("/saveBlog")
    @ResponseBody
    fun saveBlog(blog: Blog, request: HttpServletRequest):Blog 
        blog.author = (request.getSession().getAttribute("currentUser") as UserDetails).username
        return blogService.save(blog)
    

    @GetMapping("/goEditBlog")
    fun goEditBlog(@RequestParam(value = "id") id: String, model: Model): String 
        model.addAttribute("blog", blogService.findOne(id))
        return "jsp/blog/edit"
    

    @PostMapping("/editBlog")
    @ResponseBody
    fun editBlog(blog: Blog, request: HttpServletRequest) :Blog
        blog.author = (request.getSession().getAttribute("currentUser") as UserDetails).username
        blog.gmtModified = Date()
        blog.version = blog.version + 1
        return blogService.save(blog)
    

    @GetMapping("/blog")
    fun blogDetail(@RequestParam(value = "id") id: String, model: Model): String 
        model.addAttribute("blog", blogService.findOne(id))
        return "jsp/blog/detail"
    

    @GetMapping("/listblogs")
    @ResponseBody
    fun listblogs(model: Model) = blogService.findAll()

    @GetMapping("/findBlogByTitle")
    @ResponseBody
    fun findBlogByTitle(@RequestParam(value = "title") title: String) = blogService.findByTitle(title)

7 前端jsp设计

list.jsp

<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8" %>
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<%@ taglib prefix="fmt" uri="http://java.sun.com/jsp/jstl/fmt" %>
<%@ taglib prefix="fn" uri="http://java.sun.com/jsp/jstl/functions" %>
<!DOCTYPE html>
<html lang="en">
<head>
    <jsp:include page="../header.jsp"></jsp:include>
</head>
<body>
<jsp:include page="../top-nav.jsp"></jsp:include>

<div class="col-sm-12">
    <h2>文章列表</h2>
    <div class="pull-right">
        <a href="addBlog" class="btn btn-primary write-btn" target="_blank">写文章</a>
    </div>

    <table id="blogsTable" class="table table-hover">
        <thead>
        <tr>
            <th>No</th>
            <th>Title</th>
            <th>Author</th>
            <%--<th>Content</th>--%>
            <th>CreateTime</th>
        </tr>
        </thead>
        <tbody>
        <c:forEach items="$blogs" var="blog" varStatus="status">
            <tr>
                <td>$status.index+1</td>
                <td><a href="blog?id=$blog.id" target="_blank">$blog.title</a></td>
                <td>$blog.author</td>
                    <%--<td>$fn: substring(blog.content,0,100)</td>--%>
                <td>$blog.gmtCreated</td>
            </tr>
        </c:forEach>
        </tbody>

    </table>
</div>
<jsp:include page="../copyright.jsp"></jsp:include>
<script data-main="js/views/blog/config" src="js/libs/require/require.js"></script>
<script type="text/javascript">
    require(['blog-list-view']);
</script>
</body>
</html>

add.jsp

<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8" %>
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<%@ taglib prefix="fmt" uri="http://java.sun.com/jsp/jstl/fmt" %>
<!DOCTYPE html>
<html lang="en">
<head>
    <jsp:include page="../header.jsp"></jsp:include>
</head>
<body>
<jsp:include page="../top-nav.jsp"></jsp:include>
<div class="col-sm-10 blog">
    <h2>写文章</h2>

    <form id="addBlogForm" class="form-horizontal">
        <div class="form-group-lg">
            <label></label>
            <input type="text" name="title" class="form-control" placeholder="文章标题">
        </div>

        <div class="form-group-lg">
            <label></label>
            <textarea id="blogContentEditor" type="text" name="content" class="form-control" rows="100"
                      placeholder=""></textarea>
        </div>

        <div class="form-group-lg">
            <div class="col-sm-offset-2 col-sm-10">
                <button type="submit" class="btn btn-primary rest-blog-submit-btn" id="addBlogBtn">保存并发表</button>
            </div>
        </div>
    </form>
</div>
<jsp:include page="../copyright.jsp"></jsp:include>
<script data-main="js/views/blog/config" src="js/libs/require/require.js"></script>
<script type="text/javascript">
    require(['blog-add-view']);
</script>
</body>
</html>

detail.jsp

<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8" %>
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<%@ taglib prefix="fmt" uri="http://java.sun.com/jsp/jstl/fmt" %>
<!DOCTYPE html>
<html lang="en">
<head>
    <jsp:include page="../header.jsp"></jsp:include>
</head>
<body>
<jsp:include page="../top-nav.jsp"></jsp:include>
<div class="container-fluid">


    <div class="col-sm-10 blog">

        <h1 class="center">$blog.title</h1>
        <input type="hidden" id="blogId" value="$blog.id">
        <div id="goEditBlog" class="btn-link pull-right">编辑</div>

        <div class="rest-center">
            作者: $blog.author
            日期: <fmt:formatDate pattern="yyyy/MM/dd HH:mm:ss" value="$blog.gmtModified"/>
        </div>

        <textarea id="blogContent" style="display: none"><c:out value="$blog.content"
                                                                escapeXml='false'></c:out></textarea>
        <%--<textarea id="blogContent" rows="50" cols="150"><c:out value="$blog.content" escapeXml='false'></c:out></textarea>--%>
        <div class="markdown-body rest-blog-body"></div>

    </div>


</div>

<jsp:include page="../copyright.jsp"></jsp:include>

<script data-main="js/views/blog/config" src="js/libs/require/require.js"></script>
<script type="text/javascript">
    require(['blog-detail-view']);
</script>
</body>
</html>

edit.jsp

<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8" %>
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<%@ taglib prefix="fmt" uri="http://java.sun.com/jsp/jstl/fmt" %>
<!DOCTYPE html>
<html lang="en">
<head>
    <jsp:include page="../header.jsp"></jsp:include>
</head>
<body>
<jsp:include page="../top-nav.jsp"></jsp:include>
<div class="col-sm-10 blog">
    <h2>写文章</h2>

    <form id="editBlogForm" class="form-horizontal">
        <input type="hidden" name="id" value="$blog.id">
        <div class="form-group-lg">
            <label></label>
            <input type="text" name="title" class="form-control" placeholder="文章标题" value="$blog.title">
        </div>

        <div class="form-group-lg">
            <label></label>
            <textarea id="blogContentEditor" type="text" name="content" class="form-control" rows="100"
                      placeholder=""><c:out value="$blog.content" escapeXml='false'></c:out></textarea>
        </div>

        <div class="form-group-lg">
            <div class="col-sm-offset-2 col-sm-10">
                <button type="submit" class="btn btn-primary rest-blog-submit-btn" id="editBlogBtn">保存并发表</button>
            </div>
        </div>
    </form>
</div>
<jsp:include page="../copyright.jsp"></jsp:include>
<script data-main="js/views/blog/config" src="js/libs/require/require.js"></script>
<script type="text/javascript">
    require(['blog-edit-view']);
</script>
</body>
</html>

8 前端js代码

我们采用requirejs管理js。js代码跟html代码隔离。
config.js

/**
 * 入口文件config.js。它一般用来对requirejs进行配置，并且载入真正的程序模块。
 */

require.config(
    baseUrl: '/js',

    paths: 
        jquery: 'libs/jquery-2.1.4.min',
        jqueryUi: 'libs/jquery-ui.min',
        bootstarp: 'libs/bootstrap.min',
        datatables: 'plugin/datatables/jquery.dataTables',
        jsonview: 'plugin/jsonview/jquery.jsonview',
        bootstrapDialog: 'plugin/bootstrap-dialog/bootstrap-dialog',
        meditor: 'plugin/mditor-master/dist/js/mditor.min',
    ,
    shim: 
        'jqueryUi': 
            deps: ['jquery']
        ,
        'bootstarp': 
            deps: ['jquery', 'jqueryUi']
        ,
        'datatables': 
            deps: ['jquery']
        ,
        'jsonview': 
            deps: ['jquery']
        ,
        'bootstrapDialog': 
            deps: ['jquery']
        ,
        'meditor': 
            deps: ['jquery']
        
    
);

blog-add-view.js

/**
 * Created by jack on 2017/3/29.
 */

define(function (require) 
    "use strict";
    require('meditor');

    jQuery(function () 
        //meditor
        var mditor = Mditor.fromTextarea(document.getElementById('blogContentEditor'));

        //是否打开分屏
        mditor.split = true;    //打开
        //是否打开预览
        mditor.preivew = true;  //打开
        //是否全屏
        mditor.fullscreen = false;  //关闭

        //获取或设置编辑器的值
        mditor.on('ready', function () 
            mditor.value = '#Restfeel';
        );


        //写文章
        jQuery("#addBlogBtn").on("click", function () 
            jQuery.ajax(
                url: 'saveBlog',
                type: 'POST',
                data: $('#addBlogForm').serialize(),
                async: false,
                success: function (data) 
                    if (data) 
                        alert('保存成功');
                        // location.href = 'blogs.do';
                        window.opener = null;
                        window.open('', '_self');
                        window.close();

                     else 
                        alert(data);
                    
                ,
                error: function (data) 
                    alert(data);
                

            );
        );
    );

);

blog-detail-view.js

/**
 * Created by jack on 2017/3/29.
 */

define(function (require) 
    "use strict";
    require('meditor');

    $(function () 
        var parser = new Mditor.Parser();
        // var blogContent = document.getElementById('blogContent').innerHTML;//这个遇到<>等特殊字符会被转译
        var blogContent = document.getElementById('blogContent').value; //直接取原本的字符串。不会被转译
        var html = parser.parse(blogContent);
        $('.markdown-body').append(html);

        //编辑文章
        $('#goEditBlog').on('click',function () 
            var blogId = $('#blogId').val();
            location.href = 'goEditBlog?id=' + blogId;
        );


        //源码高亮
        hljs.initHighlightingOnLoad();



    );

);

blog-edit-view.js

/**
 * Created by jack on 2017/3/29.
 */

define(function (require) 
    "use strict";
    require('meditor');

    jQuery(function () 
        //meditor
        var mditor = Mditor.fromTextarea(document.getElementById('blogContentEditor'));

        //是否打开分屏
        mditor.split = true;    //打开
        //是否打开预览
        mditor.preivew = true;  //打开
        //是否全屏
        mditor.fullscreen = false;  //关闭

        //写文章
        jQuery("#editBlogBtn").on("click", function () 
            jQuery.ajax(
                type: 'POST',
                url: 'editBlog',
                data: jQuery('#editBlogForm').serialize(),
                //dataType: 'json',
                async: false,
                //在请求之前调用的函数
                beforeSend: function () 
                ,
                success: function (data) 
                    if (data) 
                        alert('保存成功');
                        history.go(-1);
                     else 
                        alert(data);
                    
                ,
                //调用执行后调用的函数
                complete: function (XMLHttpRequest, textStatus) 
                ,
                error: function (data) 
                    alert(data);
                

            );
        );
    );

);

blog-list-view.js

/**
 * Created by jack on 2017/3/29.
 */

define(function (require) 
    "use strict";
    require('datatables');

    $(function () 
        // 文章列表
        var aLengthMenu = [10, 20, 50, 100, 200];
        var dataTableOptions = 
            bDestroy: true,
            paging: true,
            lengthChange: true,
            searching: true,
            ordering: true,
            order: [3, "desc"],
            autoWidth: true,
            processing: true,
            stateSave: true,
            responsive: true,
            fixedHeader: false,
            aLengthMenu: aLengthMenu,
            language: 
                search: "<div style='border-radius:10px;margin-left:auto;margin-right:2px;width:760px;'>_INPUT_ &nbsp;<span class='btn btn-primary'>搜索</span></div>",
                paginate: //分页的样式内容
                    previous: "上一页",
                    next: "下一页",
                    first: "第一页",
                    last: "最后"
                
            ,
            zeroRecords: "没有内容",//table tbody内容为空时，tbody的内容。
            //下面三者构成了总体的左下角的内容。
            info: "总计 _TOTAL_ 条,共 _PAGES_ 页，_START_ - _END_ ",//左下角的信息显示，大写的词为关键字。
            infoEmpty: "0条记录",//筛选为空时左下角的显示。
            infoFiltered: ""//筛选之后的左下角筛选提示
        

        $('#blogsTable').dataTable(dataTableOptions)
    );

);