Spring Boot 如何读取.config文件？

待我称王封你为后i 2022-11-06 05:46 128阅读 0赞

### 具体步骤 ###

*   *  1、在resource目录创建一个需要读取的XML文件数据
     *  2、建立POJO对象，将XML数据转化为POJO对象数据
     *  3、创建一个XML解析工具类
     *  4、创建service接口和service实现类
     *  5、创建Controller调用对应的方法执行获取

**思路分析：**

这里以IntelliJ IDEA为例：

1、创建一个需要读取的XML文件数据  
2、建立POJO对象，将XML数据转化为POJO对象数据  
3、创建一个XML解析工具类  
4、创建接口和实现类  
5、创建Controller调用对应的方法执行获取

**直接进入主题：**  
目标文件：后缀为.config的文件  
在Java这里需要改为.xml文件，只是后缀发生改变，内容不变。  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NDU2MzU3Mw_size_16_color_FFFFFF_t_70]  
详细操作

## 1、在resource目录创建一个需要读取的XML文件数据 ##

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NDU2MzU3Mw_size_16_color_FFFFFF_t_70 1]  
源码：

<?xml version="1.0" encoding="gb2312"?>
    <root>
      <mpmenu id="1" title="智能信息" funcId="0202" image="6d0">
        <mpmenu id="101" title="问题表" image="" funcId="0202" url="p.aspx?t=info_question" />
        <mpmenu id="104" title="索引表" image="" funcId="0202" url="p.aspx?t=info_question&typeid=2" />
        <mpmenu id="102" title="常见答案" image="" funcId="0202" url="p.aspx?t=info_tree&formname=info_answers" />
        <mpmenu id="103" title="专业内容" image="" funcId="0202" url="p.aspx?t=info_tree" />
        <mpmenu id="108" title="行业关键字" image="" funcId="0202" url="p.aspx?t=info_keyback" />
        <mpmenu id="105" title="回复记录" image="" funcId="0202" url="p.aspx?t=info_qalog_index" />
      </mpmenu>
    
      <mpmenu id="2" title="需求管理" funcId="0207" image="616">
        <mpmenu id="201" title="待审核" image="" funcId="0207" url="p.aspx?t=unit_require&status=1" />
        <mpmenu id="202" title="发布中" image="" funcId="0207" url="p.aspx?t=unit_require&status=2" />
        <mpmenu id="203" title="驳回" image="" funcId="0207" url="p.aspx?t=unit_require&status=3" />
    
      </mpmenu>
      <mpmenu id="3" title="商城" funcId="02" image="66a">
        <mpmenu id="301" title="商品管理" image="" funcId="0203" url="p.aspx?t=goodslist" />
        <mpmenu id="302" title="订单管理" image="" funcId="0204" url="p.aspx?t=orderlist" />
        <mpmenu id="303" title="支付记录" image="" funcId="0206" url="p.aspx?t=paylog" />
        <mpmenu id="304" title="待发货" image="" funcId="0205" url="p.aspx?t=toexpress" />
        <mpmenu id="305" title="配送记录" image="" funcId="0205" url="p.aspx?t=expresslog" />
        <mpmenu id="320" title="自提点管理" image="" funcId="0203" url="p.aspx?t=self_take_place" />
        <mpmenu id="350" title="排行榜" image="" funcId="0203" url="p.aspx?t=mall_ranking" />
      </mpmenu>
    </root>

## 2、建立POJO对象，将XML数据转化为POJO对象数据 ##

创建Menudata类，作为父集（xml文件第一层`<mpmenu>`，即`<root>`下）。  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NDU2MzU3Mw_size_16_color_FFFFFF_t_70 2]  
源码：

package com.example.business.bean;
    
    import lombok.AllArgsConstructor;
    import lombok.Data;
    import lombok.NoArgsConstructor;
    
    import javax.xml.bind.annotation.*;
    import java.util.List;
    
    @Data //注在类上，提供类的get、set、equals、hashCode、canEqual、toString方法，需配置lombok依赖
    @AllArgsConstructor //注在类上，提供类的全参构造
    @NoArgsConstructor //注在类上，提供类的无参构造
    @XmlRootElement(name = "mpmenu")
    @XmlAccessorType(XmlAccessType.FIELD)
    public class Menudata { 
        @XmlAttribute(name = "id")
        private String id;
        @XmlAttribute(name = "title")
        private String title;
        @XmlAttribute(name = "image")
        private String image;
        @XmlAttribute(name = "funcId")
        private String funcid;
    
        //用于读取mpmenu第二层的数据
        @XmlElement(name = "mpmenu")
        private List<Menudatas> menudataList;
    
    }

由于这里用到的@Data等注解，该注解是引用lombok中，所以需要在pom.xml文件中添加依赖。

<dependency>
         <groupId>org.projectlombok</groupId>
         <artifactId>lombok</artifactId>
         <version>1.16.6</version>
     </dependency>

创建Menudatas类，作为子集（xml文件第二层`<mpmenu>`，即`<root>`下面的`<mpmenu>`的`<mpmenu>`）。  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NDU2MzU3Mw_size_16_color_FFFFFF_t_70 3]  
源码：

package com.example.business.bean;
    
    
    import lombok.AllArgsConstructor;
    import lombok.Data;
    import lombok.NoArgsConstructor;
    
    import javax.xml.bind.annotation.*;
    
    @Data //注在类上，提供类的get、set、equals、hashCode、canEqual、toString方法，需配置lombok依赖
    @AllArgsConstructor //注在类上，提供类的全参构造
    @NoArgsConstructor //注在类上，提供类的无参构造
    @XmlRootElement(name = "mpmenu")
    @XmlAccessorType(XmlAccessType.FIELD)
    public class Menudatas { 
        @XmlAttribute(name = "id")
        private String id;
        @XmlAttribute(name = "title")
        private String title;
        @XmlAttribute(name = "image")
        private String image;
        @XmlAttribute(name = "funcId")
        private String funcid;
        @XmlAttribute(name = "url")
        private String url;
    
    }

注意父集子集的逻辑调用，如果你的配置文件只有一层关系，则你不再需要创建Menudatas。

创建MenudataList类，用于返回集合数据。  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NDU2MzU3Mw_size_16_color_FFFFFF_t_70 4]  
源码：

package com.example.business.bean;
    
    import lombok.AllArgsConstructor;
    import lombok.Data;
    import lombok.NoArgsConstructor;
    
    import javax.xml.bind.annotation.XmlAccessType;
    import javax.xml.bind.annotation.XmlAccessorType;
    import javax.xml.bind.annotation.XmlElement;
    import javax.xml.bind.annotation.XmlRootElement;
    import java.util.List;
    
    @Data //注在类上，提供类的get、set、equals、hashCode、canEqual、toString方法
    @AllArgsConstructor //注在类上，提供类的全参构造
    @NoArgsConstructor  //注在类上，提供类的无参构造
    @XmlRootElement(name = "root")// xml 文件的根元素
    @XmlAccessorType(XmlAccessType.FIELD) // 控制默认情况下是否对字段或 Javabean 属性进行系列化。
    public class MenudataList { 
    
        @XmlElement(name = "mpmenu")
        private List<Menudata> menudataList;
    
        public List<Menudata> getMenudataList() { 
            return menudataList;
        }
    
        public void setMenudataList(List<Menudata> menudataList) { 
            this.menudataList = menudataList;
        }
    }

## 3、创建一个XML解析工具类 ##

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NDU2MzU3Mw_size_16_color_FFFFFF_t_70 5]  
源码：

package com.example.business.util;
    
    import javax.xml.bind.JAXBContext;
    import javax.xml.bind.Unmarshaller;
    import java.io.Reader;
    import java.io.StringReader;
    
    public class XmlBuilder { 
    
        /** * 将XML转为指定的POJO对象 * * @param clazz 需要转换的类 * @param xmlStr xml数据 * @return */
        public static Object xmlStrToObject(Class<?> clazz, String xmlStr) throws Exception { 
            Object xmlObject = null;
            Reader reader = null;
            //利用JAXBContext将类转为一个实例
            JAXBContext context = JAXBContext.newInstance(clazz);
            //XMl 转为对象的接口
            Unmarshaller unmarshaller = context.createUnmarshaller();
            reader = new StringReader(xmlStr);
            xmlObject = unmarshaller.unmarshal(reader);
            if (reader != null) { 
                reader.close();
            }
            return xmlObject;
        }
    }

## 4、创建service接口和service实现类 ##

service接口：  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NDU2MzU3Mw_size_16_color_FFFFFF_t_70 6]  
源码：

package com.example.business.service;
    
    import com.example.business.bean.Menudata;
    
    import java.util.List;
    
    /** * 导航栏菜单数据 */
    public interface MenudataService { 
    
        List<Menudata> listMenu() throws Exception;
    }

service实现类：  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NDU2MzU3Mw_size_16_color_FFFFFF_t_70 7]  
源码：

package com.example.business.serviceImpl;
    
    import com.example.business.bean.Menudata;
    import com.example.business.bean.MenudataList;
    import com.example.business.service.MenudataService;
    import com.example.business.util.XmlBuilder;
    import org.springframework.core.io.ClassPathResource;
    import org.springframework.core.io.Resource;
    import org.springframework.stereotype.Service;
    
    
    import java.io.BufferedReader;
    import java.io.InputStreamReader;
    import java.util.List;
    
    @Service
    public class MenudataServiceImpl implements MenudataService { 
    
        @Override
        public List<Menudata> listMenu() throws Exception { 
            //读取Resource目录下的XML文件
            Resource resource = new ClassPathResource("menudata.xml");
            //利用输入流获取XML文件内容
            BufferedReader br = new BufferedReader(new InputStreamReader(resource.getInputStream(), "gb2312"));
            StringBuffer buffer = new StringBuffer();
            String line = "";
            while ((line = br.readLine()) != null) { 
                buffer.append(line);
            }
            br.close();
            //XML转为JAVA对象
            MenudataList menudataList = (MenudataList) XmlBuilder.xmlStrToObject(MenudataList.class, buffer.toString());
            return menudataList.getMenudataList();
        }
    }

## 5、创建Controller调用对应的方法执行获取 ##

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NDU2MzU3Mw_size_16_color_FFFFFF_t_70 8]  
源码：

package com.example.business.controller;
    
    import com.example.business.bean.Menudata;
    import com.example.business.service.MenudataService;
    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.ResponseBody;
    
    import java.util.List;
    
    @Controller
    public class LoginController { 
    
        //将Service注入Web层
        @Autowired
        MenudataService menudataService;
    
        @RequestMapping("toLogin")
        public String toLogin(){ 
            return "list";
        }
    
        @ResponseBody
        @RequestMapping("findMenuData")
        public List<Menudata> findMenuData() throws Exception { 
            List<Menudata> str = menudataService.listMenu();
            return str;
        }
    
    }

HTML：（使用Layui框架，插件自行去[官网下载][Link 1]）  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NDU2MzU3Mw_size_16_color_FFFFFF_t_70 9]

HTML页面代码：

<!DOCTYPE html>
    <html lang="en">
    <head>
        <meta charset="UTF-8">
        <title>Title</title>
    </head>
    
    <link rel="stylesheet" href="layui/css/layui.css" type="text/css"></link>
    
    <link rel="stylesheet" href="css/admin.css">
    <style type="text/css"> .welcome { margin: auto; width: 400px; height: 350px; background: url("image/logos.png") no-repeat center center; background-size: cover; } .modal { display: none; padding: 20px; } </style>
    
    <body class="layui-layout-body">
    <div class="layui-layout layui-layout-admin">
        <div class="layui-header custom-header">
            
            <ul class="layui-nav layui-layout-left">
                <li class="layui-nav-item slide-sidebar" lay-unselect>
                    <a href="javascript:;" class="icon-font"><i class="ai ai-menufold"></i></a>
                </li>
            </ul>
            
            <ul class="layui-nav layui-layout-right">
                <li class="layui-nav-item">
                    <a href="javascript:;">
                        <img src="http://t.cn/RCzsdCq" class="layui-nav-img">
                        贤心
                    </a>
                    <dl class="layui-nav-child">
                        <dd><a href="">基本资料</a></dd>
                        <dd><a href="">安全设置</a></dd>
                    </dl>
                </li>
                <li class="layui-nav-item"><a href="">注销</a></li>
            </ul>
        </div>
    
        <div class="layui-side custom-admin" id="menudata">
            <div class="layui-side-scroll">
                <div class="custom-logo">
                    <img src="image/logo.png" alt=""/>
                    <h1>后台管理系统</h1>
                </div>
                <ul id="Nav" class="layui-nav layui-nav-tree layui-inline" lay-filter="demo">
    
                </ul>
            </div>
        </div>
        
        <div class="layui-body" style="height: 95%;">
            <div class="layui-tab app-container" lay-allowClose="true" lay-filter="tabs">
                <ul id="appTabs" class="layui-tab-title custom-tab"></ul>
                <div class="layui-tab-content">
                    <div id="welcome" style="width:100%;height:100%;display:flex;">
                        <div class="welcome"></div>
                    </div>
                </div>
            </div>
        </div>
    </div>
    
    <script type="text/javascript" src="js/jquery-3.3.1.min.js"></script>
    <script type="text/javascript" src="layui/layui.js"></script>
    <script type="text/javascript" src="layui/layui.all.js"></script>
    <script src="/js/home.js"></script>
    
    <script type="text/javascript"> //页面加载事件 window.onload = function () { getMenuData(); }; //获取导航栏菜单 function getMenuData() { $.ajax({ type: "GET", url: "findMenuData", cache: false, success: function (data) { //将layui在页面加载时渲染出来的span.layui-nav-bar利用DOM先删除掉再重新渲染 $('#nav').find('span.layui-nav-bar').remove(); //console.log(data); //遍历map集合 $.each(data, function (i) { var menu = '<li class="layui-nav-item">' + '<a href="javascript:;">' + '<i class="layui-icon layui-icon-friends"></i>' + '<em>' + data[i].title + '</em>' + '</a>'; if (data[i].menudataList) { var menus = ''; $.each(data[i].menudataList, function (j) { menus = menus + '<dl class="layui-nav-child">' + '<dd><a href="">' + data[i].menudataList[j].title + '</a></dd>' + '</dl>'; }) menu = menu + menus; } menu = menu + '</li>'; //console.log(menu) $("#menudata ul").append(menu); }); xuanran(); } }); } //重新渲染 function xuanran() { layui.use('element', function () { var element = layui.element; var layFilter = $("#nav").attr('lay-filter'); element.render('nav', layFilter); }) } </script>
    </body>
    </html>

运行效果：  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NDU2MzU3Mw_size_16_color_FFFFFF_t_70 10]

[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NDU2MzU3Mw_size_16_color_FFFFFF_t_70]: /images/20221023/90231749b5be48bcb7623057e9b09f57.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NDU2MzU3Mw_size_16_color_FFFFFF_t_70 1]: /images/20221023/802907f0f3854643b970a15fa8300190.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NDU2MzU3Mw_size_16_color_FFFFFF_t_70 2]: /images/20221023/3838b642642b4f22ae31959d0ea6170c.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NDU2MzU3Mw_size_16_color_FFFFFF_t_70 3]: /images/20221023/e7bc995fcf704e01a69ac886dd74f60c.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NDU2MzU3Mw_size_16_color_FFFFFF_t_70 4]: /images/20221023/3e56a56f2b704a67a2bb438709240b58.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NDU2MzU3Mw_size_16_color_FFFFFF_t_70 5]: /images/20221023/9e6f6f06307b4edeb1ab624354874408.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NDU2MzU3Mw_size_16_color_FFFFFF_t_70 6]: /images/20221023/8fd4659369dc4214ade75b28c1b5bfa5.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NDU2MzU3Mw_size_16_color_FFFFFF_t_70 7]: /images/20221023/b93e1e7227dd48459d760b271447eef4.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NDU2MzU3Mw_size_16_color_FFFFFF_t_70 8]: /images/20221023/1f7ae1424ef84edc91eedeeb700145de.png
[Link 1]: https://www.layui.com/
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NDU2MzU3Mw_size_16_color_FFFFFF_t_70 9]: /images/20221023/e3c3e710547c49f9833d95426119604b.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NDU2MzU3Mw_size_16_color_FFFFFF_t_70 10]: /images/20221023/133b6a4ea6ad423caa942cc1042b1bb4.png