JAVA 自定义异常类

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有些时候，我们需要通过自己定义的异常信息输出

首先，定义一个异常类

public class U_Customed_Exception extends Exception{public U_Customed_Exception(String msg){super(msg);}}

然后，在其他类中引用这个异常类

import com.qa.ballon.api.util.U_Customed_Exception;public class U_File_Properties {private static Logger logger = Logger.getLogger(U_File_Properties.class);public static HashMap<String,String> dbproperties = new HashMap<String, String>();//用于获取数据库配置文件的各项信息//要在方法中显示声明抛出的自定义异常类public void M_get_db_propertise(String propath,String dbtype) throws U_Customed_Exception{Properties dbprop = new Properties();try{InputStream ins = getClass().getResourceAsStream(propath);dbprop.load(ins);logger.info("the database.propertise has got successfully!!");}catch(Exception e){logger.error("the database.propertise has some problems!!");e.printStackTrace();}if(dbtype.equals("mysql")){try {dbproperties.put("mysql.ip", dbprop.getProperty("mysql.ip"));logger.info("the database info has got successfully!!");} catch (Exception e) {// TODO: handle exceptionlogger.error("Failed to collect database info,please check the keyword and values!!");e.printStackTrace();}}else {logger.error("no such type of database then~~~ dbtype you gived is "+dbtype);

<span style="white-space:pre"></span>//创建新的异常实例，抛出异常信息throw new U_Customed_Exception("no such type of database!! the type of database you gived is "+dbtype);}}

当我们执行的内容，输入的dbtype不是我们所期望的'mysql'时，则直接抛出异常，输出的结果如下：

 Exception in thread "main" com.qa.ballon.api.util.U_Customed_Exception: no such type of database!! the type of database you gived is sqlat com.qa.ballon.api.util.U_File_Properties.M_get_db_propertise(U_File_Properties.java:52)at com.qa.ballon.api.util.U_File_Properties.main(U_File_Properties.java:60)

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