☻Blog("Laziji")

System.out.print("辣子鸡的博客");

发表于 更新于 分类于

使用javax.validation注解, 实现表单验证

使用

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@RequestMapping("/")
public String index(LoginForm form){
    if (!form.verification()) {
        return null;
    }
    // TODO ...
    return "index";
}

LoginForm.java

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import javax.validation.constraints.NotNull;
import javax.validation.constraints.Pattern;

public class LoginForm extends BaseForm {

    @NotNull
    @Pattern(regexp = "[A-Za-z0-9]{1,32}")
    private String username;

    @NotNull
    @Pattern(regexp = "[A-Za-z0-9]{32}")
    private String password;


    public String getUsername() {
        return username;
    }

    public void setUsername(String username) {
        this.username = username;
    }

    public String getPassword() {
        return password;
    }

    public void setPassword(String password) {
        this.password = password;
    }
}

BaseForm.java

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import org.hibernate.validator.HibernateValidator;
import javax.validation.Validation;
import javax.validation.Validator;

public abstract class BaseForm {

    private final static Validator validator = Validation
            .byProvider(HibernateValidator.class).configure()
            .failFast(true).buildValidatorFactory().getValidator();

    public boolean verification() {
        return validator.validate(this).size() == 0;
    }
}

主要的几个注解

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@DecimalMax
@DecimalMin
@Digits
@Future
@Max
@Min
@NotNull
@Past
@Pattern
@Size

发表于 更新于 分类于

Gravizo

介绍一个在markdown中插入流程图、各种图的方法
http://g.gravizo.com
打开上面这个网站, 这个网站提供动态生成各种图的http接口
像这样使用, 接口根据传入的参数返回图

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<img src='https://g.gravizo.com/svg?
 digraph G {
   main -> parse -> execute;
   main -> init;
   main -> cleanup;
   execute -> make_string;
   execute -> printf
   init -> make_string;
   main -> printf;
   execute -> compare;
 }
'/>

使用

官网中介绍Markdown中是这样使用的

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![Alt text](https://g.gravizo.com/svg?
    digraph G {
        main -> parse -> execute;
        main -> init;
        main -> cleanup;
        execute -> make_string;
        execute -> printf
        init -> make_string;
        main -> printf;
        execute -> compare;
    }
)

不过在Hexo直接这样写是不行的, 需要进行编码, 找到官网靠近底部的Test/Encoder, 这里提供一个简单的编码器, 输入你想生成的图 如:

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digraph G {
    main -> parse -> execute;
    main -> init;
    main -> cleanup;
    execute -> make_string;
    execute -> printf
    init -> make_string;
    main -> printf;
    execute -> compare;
}

点击编码, 把右边的链接复制过来, 放在Markdown的图片标签里就可以了

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![digraph](https://g.gravizo.com/svg?digraph%20G%20%7B%0A%20%20%20main%20-%3E%20parse%20-%3E%20execute%3B%0A%20%20%20main%20-%3E%20init%3B%0A%20%20%20main%20-%3E%20cleanup%3B%0A%20%20%20execute%20-%3E%20make_string%3B%0A%20%20%20execute%20-%3E%20printf%0A%20%20%20init%20-%3E%20make_string%3B%0A%20%20%20main%20-%3E%20printf%3B%0A%20%20%20execute%20-%3E%20compare%3B%0A%20%7D)

效果如下
digraph

由于只是图片的链接, 所以在任何支持Markdown或者Html的地方都能用, 非常方便

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