Jacksum NoSuchAlgorithmException [英] Jacksum NoSuchAlgorithmException

问题描述

我正在尝试使用Jacksum API来

I'm trying to use the Jacksum API to generate a Whirlpool hash, but I'm getting a NoSuchAlgorithmException:

import java.security.NoSuchAlgorithmException;
import jonelo.jacksum.JacksumAPI;
import jonelo.jacksum.algorithm.AbstractChecksum;

public static String genHash(String inText) {

    AbstractChecksum checksum = null;
    checksum = JacksumAPI.getChecksumInstance("whirlpool");
    checksum.update(inText.getBytes());
    return checksum.getFormattedValue();

}

我尝试了其他流行的算法(sha256，md5)，它们显然都不是这样".

I tried other popular algorithms (sha256, md5) and they all apparently "aren't such".

./libsdpg.java:27: error: unreported exception NoSuchAlgorithmException; must be caught or declared to be thrown
    checksum = JacksumAPI.getChecksumInstance("whirlpool");
                                             ^
1 error

我添加了try-catch，现在它实际上正在获取错误.

I added the try-catch, and now it's actually getting the error.

推荐答案

您实际上并不是在获取"异常.编译器告诉您您未能适当地处理已检查的异常.

You are not actually "getting" an exception. The compiler is telling you that you have failed to appropriately handle a checked exception.

JacksumAPI#getChecksumInstance(java.lang.String)方法引发一个称为NoSuchAlgorithmException的已检查异常.必须(使用try-catch)显式处理已检查的异常，或者封闭方法必须声明将其包括在其签名中，从而引发该异常.因此，您的选择是:

The JacksumAPI#getChecksumInstance(java.lang.String) method throws a checked exception called NoSuchAlgorithmException. A checked exception must either be explicitly handled (using try-catch), or the enclosing method must declare that it throws it by including it in its signature. So your options are:

try {
   ...
   checksum = JacksumAPI.getChecksumInstance("whirlpool");
   ...
} catch(NoSuchAlgorithmException e) {
   //handle the exception
}

或将您的方法签名更改为:

or change your method signature to:

public static String genHash(String inText) throws NoSuchAlgorithmException {
    ...
}

请记住，使用第二个选项，您只是将处理推到了更高的层次(即，调用genHash的地方)；您基本上必须在某个时候处理它.

Keep in mind with the second option you have merely pushed the handling up to a higher level (i.e., where genHash is called); you will essentially have to handle it at some point.

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