Question

我正在将选择列表值传递给我的动作，但是在对其进行调试之后，我发现我的动作上的变量具有空值，看来它没有将选择列表的选定值传递给动作视图如下：-

    enter <%@ page language="java" contentType="text/html; charset=ISO-8859-1"
    pageEncoding="ISO-8859-1"%>
<%@ taglib prefix="s" uri="/struts-tags"%>
<%@ taglib prefix="sb" uri="/struts-bootstrap-tags"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<link href="assets/css/bootstrap-united.css" rel="stylesheet" />
<link href="bootstrap/css/bootstrap-responsive.css" rel="stylesheet" />
<style>
body {
    height: 100%;
    margin: 0;
    background: url(assets/img/books.jpg);
    background-size: 1440px 800px;
    background-repeat: no-repeat;
    display: compact;
    color: black;
}

#div1 {
    color: "black";
}
</style>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>Insert title here</title>
</head>
<body>

    <form class="navbar-form navbar-right" action="course" method="get">

                    <s:select name="selectedCourse" label="Courses available"
                        headerKey="-1" list="availableCourse"
                        headerValue="Choose a course"></s:select>
                </div>
                <s:a class="btn btn-primary" href="course">View Course » </s:a>
                <a class="btn btn-primary" href="course-input">View Course » </a>
            </div>

            <div></div>

        </div>
    </form>
    <script src="jquery-1.8.3.js">

    </script>

    <script src="bootstrap/js/bootstrap.js">

    </script>

</body>
</html>

我的操作如下：-我遵循了所有命名约定，似乎每次都没有调用setter，但是在调试时看到的任何方法都称为getter。

package com.trainingbasket.ssms.actions;

import java.util.ArrayList;
import java.util.List;
import org.apache.struts2.convention.annotation.Action;
import org.apache.struts2.convention.annotation.Result;

import com.opensymphony.xwork2.ActionSupport;
import com.opensymphony.xwork2.validator.annotations.RequiredStringValidator;
import com.opensymphony.xwork2.validator.annotations.ValidatorType;
import com.trainingbasket.ssms.service.CourseService;

/*It initializes the course list from Database and after course is selected 
 * displays the description as recorded in DB to the user. */

@SuppressWarnings("serial")
public class CourseAction extends ActionSupport {

    private CourseAction courseAction;
    private String selectedCourse;// selectedCourse
    public List<String> getAvailableCourse() {
        return availableCourse;
    }

    public void setAvailableCourse(List<String> availableCourse) {
        this.availableCourse = availableCourse;
    }

    private List<String> availableCourse;

    @Action("course-input")
    public String input() throws Exception {
        return "course";
    }

    @Action(value = "course", results = {
            @Result(name = "success", location = "courseDetail", type = "redirect"),
            @Result(name = "failure", location = "course", type = "redirect") })

    // @Action("course")
    @Override
    public String execute() throws Exception {

        String result = "";

        CourseService courseService = new CourseService();

        if (selectedCourse != null) {
            result = courseService.findByName(selectedCourse);
            if (result.equals("Course FoundSuccess")) {

                System.out.println("in success");
                return "success";
            } else {

                System.out.println("in failure");
                return "failure";
            }
        }
        return SUCCESS; // need to change as per logic
    }

    public CourseAction() {

        availableCourse = new ArrayList<String>(); // need to fetch courseNAmes from the DB into this list;
        /* hard coding up till DB problem is solved */
        availableCourse.add("Java");
        availableCourse.add("Python");
        availableCourse.add("Big Data");
        availableCourse.add("Machine Learning");
        availableCourse.add("Guru");
    }

    public String getSelectedCourse() {
        System.out.println(selectedCourse);
        return selectedCourse;
    }

    @RequiredStringValidator(type = ValidatorType.FIELD, message = "Course is a required field")
    public void setSelectedCourse(String selectedCourse) {
        System.out.println("dsdsds"+selectedCourse);
        this.selectedCourse = selectedCourse;
    }
}

Struts 2将SelectList的值传递给操作

0 个答案: