java通过抛异常来返回提示信息-白红宇

结论：

如果把通过抛异常的方式得到提示信息，可以使用java.lang.Throwable中的构造函数：

public Throwable(String message) {        fillInStackTrace();        detailMessage = message;    }

或

public Throwable(String message, Throwable cause) {        fillInStackTrace();        detailMessage = message;        this.cause = cause;    }

原因及代码示例：

1、通过java.lang.Throwable中的Constructs

public Throwable(Throwable cause) {        fillInStackTrace();        detailMessage = (cause==null ? null : cause.toString());        this.cause = cause;    }

在输出时获取的detailMessage是：

exception.ProcessorException: java.lang.IllegalArgumentException: Failt to process

Exception信息的输出：

exception.ProcessorException: exception.ProcessorException: java.lang.IllegalArgumentException: Failt to process

code:

package exception;/*2015-8-22*/public class ExceptionChain {    public static void main(String[] args) {        Business business = new Business();        try {            business.doBusiness();        } catch (ProcessorException e) {            System.out.println(e.getMessage());            System.out.println("e:\n" + e);        }    }}class Business {    public void doBusiness() throws ProcessorException {        try {            process1();        } catch (Exception e) {            throw new ProcessorException(e);            // throw new ProcessorException(e.getMessage(), e);            // throw new ProcessorException(e.getMessage());        }    }    private void process1() throws ProcessorException {        try {            process2();        } catch (Exception e) {            // throw new ProcessorException(e.getMessage(), e);            // throw new ProcessorException(e.getMessage());            throw new ProcessorException(e);        }    }    private void process2() {        throw new IllegalArgumentException("Failt to process");    }}class ProcessorException extends Exception {    private static final long serialVersionUID = -4270191862690602942L;    public ProcessorException(Throwable cause) {        super(cause);    }    public ProcessorException(String message) {        super(message);    }    public ProcessorException(String message, Throwable cause) {        super(message, cause);    }}

2、通过java.lang.Throwable中的Constructs

public Throwable(String message) {        fillInStackTrace();        detailMessage = message;    }

/**     * Fills in the execution stack trace. This method records within this     * Throwable object information about the current state of     * the stack frames for the current thread.     *     * @return  a reference to this Throwable instance.     * @see     java.lang.Throwable#printStackTrace()     */    public synchronized native Throwable fillInStackTrace();

在输出时获取的detailMessage是：

Failt to process

Exception信息的输出：

exception.ProcessorException: Failt to process

code:

把上面示例代码中throw new ProcessorException(e.getMessage());注释去掉，把 // throw new ProcessorException(e);注释

3、通过java.lang.Throwable中的Constructs：

public Throwable(String message, Throwable cause) {        fillInStackTrace();        detailMessage = message;        this.cause = cause;    }

在输出时获取的detailMessage是：

Failt to process

Exception信息的输出：

exception.ProcessorException: Failt to process

code:

操作方式与2相同