5. 输入校验 !--圣思园Struts 2.2笔记

执行流程:
1)  首先进行类型转换
2)  然后进行输入校验(执行 validate 方法)
3)  如果在上述过程中出现了任何错误,都不会再去执行 execute
方法,会转向 struts.xml 中该 action 的名为 input 的 result 所对应的页面。

struts 2提供接口:

package com.opensymphony.xwork2;

/**
 * Provides an interface in which a call for a validation check can be done.
 */

public interface Validateable {

    /**
     * Performs validation.
     */

    void validate();

}


ActionSupport实现了该接口,但不对validate()方法做任何实现:

package com.opensymphony.xwork2;
import com.opensymphony.xwork2.inject.Container;
import com.opensymphony.xwork2.inject.Inject;
import com.opensymphony.xwork2.util.ValueStack;
import com.opensymphony.xwork2.util.logging.Logger;
import com.opensymphony.xwork2.util.logging.LoggerFactory;
import java.io.Serializable;
import java.util.Collection;
import java.util.List;
import java.util.Locale;
import java.util.Map;
import java.util.ResourceBundle;
/**
 * Provides a default implementation for the most common actions.
 * See the documentation for all the interfaces this class implements for more detailed information.
 */
public class ActionSupport implements Action, Validateable, ValidationAware, TextProvider, LocaleProvider, Serializable {
    ...
    /**
     * A default implementation that validates nothing.
     * Subclasses should override this method to provide validations.
     */
    public void validate() {
    }
}


示例:
/webs2/validate/register.jsp
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%@ taglib prefix="s" uri="/struts-tags" %>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
  <head>
    <title>register</title>
  </head>
  <body>
    <h2><font color="blue">用户注册</font></h2>
    <s:actionerror cssStyle="color:red"/><!-- 以红色显示action级别的错误! -->
    <s:fielderror cssStyle="color:blue"/><!-- 以蓝色显示field级别的错误! -->  
    <form action="register.action">
        username: <input type="text" name="username" size="20"><br>
        password: <input type="password" name="password" size="20"><br>
        repassword: <input type="password" name="repassword" size="20"><br>
        age: <input type="text" name="age" size="20"><br>
        birthday: <input type="text" name="birthday" size="20"><br>
        graduation: <input type="text" name="graduation" size="20"><br>
        <input type="submit" value="submit"/>
    </form>
  </body>
</html>



package discovery.struts2.validate;

import java.util.Calendar;
import java.util.Date;

import com.opensymphony.xwork2.ActionSupport;

public class RegisterAction extends ActionSupport {
   
    private String username;
   
    private String password;
   
    private String repassword;
   
    private int age;
   
    private Date birthday;
   
    private Date graduation;
   
    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;
    }

    public String getRepassword() {
        return repassword;
    }

    public void setRepassword(String repassword) {
        this.repassword = repassword;
    }

    public int getAge() {
        return age;
    }

    public void setAge(int age) {
        this.age = age;
    }

    public Date getBirthday() {
        return birthday;
    }

    public void setBirthday(Date birthday) {
        this.birthday = birthday;
    }

    public Date getGraduation() {
        return graduation;
    }

    public void setGraduation(Date graduation) {
        this.graduation = graduation;
    }

    @Override
    public String execute() throws Exception {
        System.out.println("execute() invoked!");
        return SUCCESS;
    }
   
    // validate()先于execute()执行!
    @Override
    public void validate() {
        System.out.println("validate() invoked start!");
       
        if(null == username || username.length() < 4 || username.length() > 6) {
            // 添加Action 级别的错误!
            this.addActionError("username invalid!");
            // 添加Field级别的错误!
            this.addFieldError("username", "username invalid in field!");
        }
        
        if(null == password || password.length() < 4 || password.length() > 6) {
            // Action 级别的错误!
            this.addActionError("password invalid");
            // Field级别的错误!
            this.addFieldError("password""password invalid in field!");
        } 
 
        if(null != birthday && null != graduation) {
            Calendar c1 = Calendar.getInstance();
            c1.setTime(birthday);
           
            Calendar c2 = Calendar.getInstance();
            c2.setTime(graduation);
           
            if(!c1.before(c2))
            {
                this.addActionError("birthday should be before graduation");
            }
        }
        System.out.println("validate() invoked end!");
    }
   
}

            <action name="register" class="discovery.struts2.validate.RegisterAction">
                <result name="success">/webs2/validate/registerResult.jsp</result>
                <!-- validate()校验不通过时,返回input,跳转到相应页面 -->
                <result name="input">/webs2/validate/register.jsp</result>
            </action>



使用struts2标签显示页面:
    <s:form action="register.action">
        <s:textfield name="username" label="username"/>
        <s:password name="password" label="password"/>
        <s:password name="repassword" label="repassword"/>
        <s:textfield name="age" label="age"/>
        <s:textfield name="birthday" label="birthday"/>
        <s:textfield name="graduation" label="graduation"/>
        <s:submit value="submit"/>
    </s:form>
         
struts2标签将会把错误信息显示到空间上方!

添加theme="simple"属性:将取消struts2提供的样式,方便使用自己的样式,同时又保留了提交时填写的数据!
    <s:form action="register.action" theme="simple">
        <s:textfield name="username" label="username"></s:textfield>
        <s:password name="password" label="password"/>
        <s:password name="repassword" label="repassword"/>
        <s:textfield name="age" label="age"/>
        <s:textfield name="birthday" label="birthday"/>
        <s:textfield name="graduation" label="graduation"/>
        <s:submit value="submit"/>
    </s:form>


<s:form>标签使用post方法提交数据

查看网页源代码:



当输入不符合要求的数据:
提交:
birthday age graduation 提示不符合类型要求!

先执行类型转换,再进行输入校验!
因为没有setAge(String str)方法可被调用,输入数据又不能转换为int,所以age的值还是默认值0.
又因为没有setBirthday(String str)和setGraduation(String str)方法,填入的数据又不能转换为Date,所以属性值仍然是默认值null.
package discovery.struts2.validate;

import java.util.Calendar;
import java.util.Date;

import com.opensymphony.xwork2.ActionSupport;

public class RegisterAction extends ActionSupport {
   
    private String username;
   
    private String password;
   
    private String repassword;
   
    private int age;
   
    private Date birthday;
   
    private Date graduation;
   
    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;
    }

    public String getRepassword() {
        return repassword;
    }

    public void setRepassword(String repassword) {
        this.repassword = repassword;
    }

    public int getAge() {
        return age;
    }

    public void setAge(int age) {
        this.age = age;
    }

    public Date getBirthday() {
        return birthday;
    }

    public void setBirthday(Date birthday) {
        this.birthday = birthday;
    }

    public Date getGraduation() {
        return graduation;
    }

    public void setGraduation(Date graduation) {
        this.graduation = graduation;
    }

    @Override
    public String execute() throws Exception {
        System.out.println("execute() invoked!");
        return SUCCESS;
    }
   
    // validate()先于execute()执行!
    @Override
    public void validate() {
       
        if(null == username || username.length() < 4 || username.length() > 6)
        {
            this.addActionError("username invalid");
           
            this.addFieldError("username", "username invalid in field");
        }
       
        if(null == password || password.length() < 4 || password.length() > 6)
        {
            this.addActionError("password invalid");
        }
        else if(null == repassword || repassword.length() < 4 || repassword.length() > 6)
        {
            this.addActionError("repassword invalid");
        }
        else if(!password.equals(repassword))
        {
            this.addActionError("the passwords not the same");
        }
       
        if(age < 10 || age > 50)
        {
            this.addActionError("age invalid");
        }
       
        if(null == birthday)
        {
            this.addActionError("birthday invalid");
        }
       
        if(null == graduation)
        {
            this.addActionError("graduation invalid");
        }
       
        if(null != birthday && null != graduation)
        {
            Calendar c1 = Calendar.getInstance();
            c1.setTime(birthday);
           
            Calendar c2 = Calendar.getInstance();
            c2.setTime(graduation);
           
            if(!c1.before(c2))
            {
                this.addActionError("birthday should be before graduation");
            }
        }
    }
   
}


当调用 getActionErrors()方法返回 Action 级别的错误信息列表时,
返回的实际上是集合的一个副本而不是集合本身,因此对集合副
本调用 clear()方法清除的依旧是副本中的元素而非原集合中的元
素,此时原集合中的内容没有收到任何的影响。 换句话说, Action
级别的错误信息列表对开发者来说是只读的。

Field  Error 级别的错误信息底层是用 LinkedHashMap 实现的,该
Map 的 key 是 String 类型,value 是 List<String>类型,这就表示一
个 Field  Name 可以对应多条错误信息,这些错误信息都放置在
List<String>集合当中

//        this.getActionErrors().clear();
//        this.getFieldErrors().clear();
        this.clearActionErrors();
        this.clearFieldErrors();








posted @ 2014-02-22 01:16  龍變  阅读(251)  评论(0编辑  收藏  举报