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• With the Validator framework, what do you want to do with Assert
• org.springframework.util.Assert
• • Object and type assertions
  • Text assertion
  • Logical assertion
  • Collection and map assertions
  • Array assertion
• Source code

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SpringBoot - elegant implementation of [parameter verification] advanced

SpringBoot - elegant implementation of [custom parameter verification] advanced

SpringBoot - elegant implementation of [parameter grouping verification] advanced

With the Validator framework, what do you want to do with Assert

In short, Validator only solves the data verification of parameters, but not between parameters and business data

Let's take an example

/**
 * @author Small craftsman
 * @version 1.0
 * @mark: show me the code , change the world
 */

@RestController
@Slf4j 
@RequestMapping("/assert")
public class ArtisanController {

    @Autowired
    private ArtisanDao artisanDao;

    /**
     * Validator It only solves the data verification of the parameter itself, but cannot solve the verification between the parameter and the business data
     *
     * @param
     * @return
     */
    @PostMapping("/testNoAssert")
    public void testNoAssert(@RequestParam("artisanId") String artisanId) {
        Artisan artisan = artisanDao.selectArtisanReturnNull(artisanId);

        if (artisan == null) {
            throw new IllegalArgumentException("user does not exist");
        }

    }

}

We are all familiar with non empty judgment

What about Assert?

    /**
     * Validator It only solves the data verification of the parameter itself, but cannot solve the verification between the parameter and the business data
     *
     * @param
     * @return
     */
    @PostMapping("/testWithAssert")
    public void testWithAssert(@RequestParam("artisanId") String artisanId) {
        Artisan artisan = artisanDao.selectArtisanReturnNull(artisanId);

        Assert.notNull(artisan, "User does not exist( Assert (thrown)");

    }

Do you find that Assert code is more elegant and concise, and can also achieve results

Assert assertion basically replaces the traditional if judgment, reduces the number of code lines for business parameter verification, improves program readability, and likes it~~~

Everyone is using it. Just look for it. I don't believe you see

[return result]

Let's see

The thrown exception is IllegalArgumentException, so handle the global exception

    /**
     * Assert abnormal
     */
    @ExceptionHandler({IllegalArgumentException.class, IllegalStateException.class})
    @ResponseStatus(HttpStatus.INTERNAL_SERVER_ERROR)
    public ResponseData<String> exception(IllegalArgumentException e) {
        return ResponseData.fail(ResponseCode.ILLEGAL_ARGUMENT.getCode(), e.getMessage());
    }

Of course, my return result is handled by the global exception. If there is no global exception handling, the original error will be returned

org.springframework.util.Assert

Let's take a look at the methods of asset

Simple classification

Object and type assertions

Text assertion

Logical assertion

Collection and map assertions

Array assertion

Source code

https://github.com/yangshangwei/boot2