struts2防重复提交

1. struts2防重复提交

Student.java

package com.andrew.model;
public class Student {
    private String name;
    private String age;
    public String getName() {
        return name;
    }
    public void setName(String name) {
        this.name = name;
    }
    public String getAge() {
        return age;
    }
    public void setAge(String age) {
        this.age = age;
    }
    @Override
    public String toString() {
        return "Student [name=" + name + ", age=" + age + "]";
    }
}

StudentAction.java

package com.andrew.action;
import com.andrew.model.Student;
import com.opensymphony.xwork2.ActionSupport;
public class StudentAction extends ActionSupport {
    private Student student;
    public Student getStudent() {
        return student;
    }
    public void setStudent(Student student) {
        this.student = student;
    }
    public String add() throws Exception {
        System.out.println("开始添加学生：" + student);
        Thread.sleep(5000);
        System.out.println(student.getName() + "添加完成");
        return SUCCESS;
    }
}

student.jsp

<%@taglib prefix="s" uri="/struts-tags" %>
<s:actionerror/>
<form action="student" method="post" >
    <s:token></s:token>
    姓名：<input type="text" name="student.name"/><br/>
    年龄：<input type="text" name="student.age"/><br/>
    <input type="submit" value="提交"/>
</form>

success.jsp

学生添加成功！

2. 使用<s:token/>标签防重复提交

<s:token></s:token>：加在form里；
使用token拦截器：
<interceptor-refname="token"></interceptor-ref>
<interceptor-refname="defaultStack"></interceptor-ref>
<resultname="invalid.token">/student.jsp</result>：在struts.xml里配置，假如出现重复提交，则直接回到页面；
<s:actionerror/>：在页面上显示错误信息；

struts.xml

<package name="manager" extends="struts-default">
    <action name="student" class="com.andrew.action.StudentAction" method="add">
        <result name="success">/success.jsp</result>
        <result name="invalid.token">/student.jsp</result>
        <interceptor-ref name="token"></interceptor-ref>
        <interceptor-ref name="defaultStack"></interceptor-ref>
    </action>
</package>

http://localhost:8080/HeadFirstStruts2Chap09/student.jsp
a01 11 submit
submit
The form has already been processed or no token was supplied, please try again.
http://localhost:8080/HeadFirstStruts2Chap09/student
学生添加成功！ 

3. 使用tokenSession拦截器防重复提交

tokenSesssion拦截器直接无视重复提交的请求；
<interceptor-refname="tokenSession"></interceptor-ref>
<interceptor-refname="defaultStack"></interceptor-ref>

struts.xml

<package name="manager" extends="struts-default">
    <action name="student" class="com.andrew.action.StudentAction" method="add">
        <result name="success">/success.jsp</result>
        <result name="invalid.token">/student.jsp</result>
        <!-- <interceptor-ref name="token"></interceptor-ref>
        <interceptor-ref name="defaultStack"></interceptor-ref> -->
        <interceptor-ref name="tokenSession"></interceptor-ref>
        <interceptor-ref name="defaultStack"></interceptor-ref>
    </action>
</package>

http://localhost:8080/HeadFirstStruts2Chap09/student.jsp
a02 12 submit
submit
控制台：
警告: Form token 7PUG6529S0A9H8YD7I15HOY6ITPDYJDK does not match the session token null.
http://localhost:8080/HeadFirstStruts2Chap09/student
学生添加成功！