手写从配置文件中读取信息并进行解析的工具类

电玩女神 2022-09-29 04:20 56阅读 0赞

1.  首先创建一个javabean实体

//实体类---javaBean
    public class Person { 
    
        public int id;
    
        public String name;
    
        public Person(int id, String name) {
            super();
            this.id = id;
            this.name = name;
        }
    
    
        public Person(){}
    
    
    
        public int getId() {
            return id;
        }
    
    
        public void setId(int id) {
            this.id = id;
        }
    
    
        public String getName() {
            return name;
        }
    
    
        public void setName(String name) {
            this.name = name;
        }
    
    
        @Override
        public String toString() {
    
            return "编号："+ this.id+" 姓名："+ this.name;
        }
    
    }

2.按自己的意愿对配置文件（a.txt）进行格式上的要求，只要和解析相对应即可

com.introspector.Person
    id=12
    name=ss

3.利用反射机制获取对象并解析内容

public class Demo {
    
    
            public static void main(String[] args) throws Exception {
    
                Person p = (Person)getInstance();
                System.out.println(p);
            }
            public static Object getInstance() throws Exception {
    
                BufferedReader bufferedReader = new BufferedReader(new FileReader("a.txt"));
                //读取配置文件完整类名
                String className = bufferedReader.readLine();
                //通过class对象名获取Class对象
                Class clazz = Class.forName(className);
                //通过class对象获取无参构造函数
                Constructor constructor = clazz.getConstructor(null);
                //创建对象
                Object o = constructor.newInstance(null);
    
                String line = null;
    
                while((line = bufferedReader.readLine())!=null){
    
                    String[] datas = line.split("=");
    
                    Field field = clazz.getDeclaredField(datas[0]);
    
                    if(field.getType()==int.class){
    
                        field.set(o, Integer.parseInt(datas[1]));
                    }else{
                        field.set(o, datas[1]);
                    }
                }
                return o;
            }
    
    
        }

配置文件基本思想的简单实现，主要应用到java中的IO流操作，javabean以及反射机制

**执行结果如下：**

![执行结果][SouthEast]

## **注意：数据类型的变换问题** ##

[SouthEast]: /images/20220708/262320b07a374b4d8c1edeb13000fbe5.png