struts2--自定义校验器

青旅半醒 2024-02-18 14:16 64阅读 0赞

以输入密码必须由字母和数字组成说明：

![Center][]

自定义拦截器：

定义一个验证器的类：

> 自定义的验证器都需要实现 Validator接口.  
> 可以选择继承 ValidatorSupport 或 FieldValidatorSupport 类，这两个类都实现了Validator接口了；FieldValidatorSupport继承ValidatorSupport，FieldValidatorSupport用于 字段验证  
> 若希望实现一个一般的验证器, 则可以继承 ValidatorSupport  
> 若希望实现一个字段验证器, 则可以继承 FieldValidatorSupport

实现的校验器类MyValidate.java

package com.validator;
    
    import com.opensymphony.xwork2.validator.ValidationException;
    import com.opensymphony.xwork2.validator.validators.FieldValidatorSupport;
    
    public class MyValidate extends FieldValidatorSupport{
    
    	@Override
    	public void validate(Object object) throws ValidationException {
    		String fieldName = super.getFieldName();//获取字段名
    		String value = (String) super.getFieldValue(fieldName, object);
    		if(value == null || value == ""){
    			return;
    		}
    		if(!isNum(value)){
    			addFieldError(fieldName, object);
    		}
    	}
        private static final String GROUP = "0123456789";
        private static final String GROUP2 = "qwertyuioplkjhgfdsazxcvbnm";
        
        public boolean isNum(String value) {
    		boolean fag1 = false;
    		boolean fag2 = false;
    		for(int i = 0; i < value.length(); i++){
    			if(fag1&&fag2){
    				return true;
    			}
    			String sub = value.substring(i, i+1);
    			if(!fag1){
    				if(GROUP.contains(sub)){
    					fag1 = true;
    					continue;
    				}
    			}
    			
    			if(!fag2){
    				if(GROUP2.contains(sub)){
    					fag2 = true;
    					continue;
    				}
    			}
    		}
    		
    		return false;
    	}
    }

> 默认情况下, Struts2 会在 类路径的根目录下加载 validators.xml 文件. 在该文件中加载验证器.  
  该文件的定义方式同默认的验证器的那个配置文件: 位于 com.opensymphony.xwork2.validator.validators 下的 default.xml  
   
 > 若类路径下没有指定的验证器, 则从 com.opensymphony.xwork2.validator.validators 下的 default.xml 中的验证器加载

所以，需要在src目录下定义一个validators.xml 文件

代码实现如下：

validators.xml

<?xml version="1.0" encoding="UTF-8"?>
    <!DOCTYPE validators PUBLIC
            "-//OpenSymphony Group//XWork Validator Config 1.0//EN"
            "http://www.opensymphony.com/xwork/xwork-validator-config-1.0.dtd">
      		
    <validators>
    
      <validator name = "test" class = "com.validator.MyValidate"/>
    </validators>

LoginAction-validation.xml:

<?xml version="1.0" encoding="UTF-8"?>
      <!DOCTYPE validators PUBLIC
      		"-//OpenSymphony Group//XWork Validator 1.0.3//EN"
      		"http://www.opensymphony.com/xwork/xwork-validator-1.0.3.dtd">
      		
    
    <validators>  
      <validator type = "test">
          <param name = "fieldName">user.password</param>
          <message>密码必须由数字和字母组成</message>
      </validator>
    </validators>

LoginAction类：

package com.action;
    
    import com.bean.User;
    import com.opensymphony.xwork2.ActionSupport;
    
    public class LoginAction extends ActionSupport{
     private User user;
     public String execute() {
    	return SUCCESS;
    }
    public User getUser() {
    	return user;
    }
    
    public void setUser(User user) {
    	this.user = user;
    }
     
    }

[Center]: https://image.dandelioncloud.cn/pgy_files/images/2024/01/29/11f6d07335e741c3b8a0cc1920154623.png