目录：
- 概述
- 实现方法及测试
[一]、概述
继前面一篇 springMVC 页面中多个对象的数据绑定 ，本文主要介绍如果实现复杂类型对象的数据绑定，比如前文中的父级对象CourseInfo 中增加：String[] times , List<Student> studentList 这两个复杂类型属性，页面中数据如何才能准确绑定到对象上呢？
[二]、实现方法及测试
CourseInfo.java 修改成如下：
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package com.micmiu.demo.web.v2.demo.vo; import java.util.List; import org.apache.commons.lang3.builder.ToStringBuilder; import com.micmiu.demo.web.v2.demo.entity.Course; import com.micmiu.demo.web.v2.demo.entity.Student; import com.micmiu.demo.web.v2.demo.entity.Teacher; /** * 课程信息(view层) * * @author <a href="http://www.micmiu.com">Michael Sun</a> */ public class CourseInfo { // 课程介绍 private Course course; // 老师信息 private Teacher teacher; // 上课时间 private String[] times; // 学生列表 private List<Student> studentList; public Course getCourse() { return course; } public Teacher getTeacher() { return teacher; } public void setCourse(Course course) { this.course = course; } public void setTeacher(Teacher teacher) { this.teacher = teacher; } public String[] getTimes() { return times; } public List<Student> getStudentList() { return studentList; } public void setTimes(String[] times) { this.times = times; } public void setStudentList(List<Student> studentList) { this.studentList = studentList; } @Override public String toString() { return ToStringBuilder.reflectionToString(this); } } |
Student.java :
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package com.micmiu.demo.web.v2.demo.entity; import javax.persistence.Column; import javax.persistence.Entity; import javax.persistence.Table; import org.apache.commons.lang3.builder.ToStringBuilder; import com.micmiu.demo.web.v2.base.entity.IdEntity; /** * 学生信息 * * @author <a href="http://www.micmiu.com">Michael Sun</a> */ @Entity @Table(name = "T_DEMO_STUDENT") public class Student extends IdEntity { @Column(name = "NAME") private String name; @Column(name = "EMAIL") private String email; @Column(name = "CLASS_NAME") private String className; public String getName() { return name; } public String getEmail() { return email; } public String getClassName() { return className; } public void setName(String name) { this.name = name; } public void setEmail(String email) { this.email = email; } public void setClassName(String className) { this.className = className; } @Override public String toString() { return ToStringBuilder.reflectionToString(this); } } |
view 层页面修改成如下：
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<form:form id="input-form" modelAttribute="courseInfo" action="${ctx}/demo/course.do?method=save" method="post"> <input type="hidden" name="id" value="${course.id}" /> <fieldset class="prepend-top"> <legend>课程信息</legend> <div id="messageBox" class="error-msg" style="display: none">输入有误，请先更正。</div> <div> <label for="course.name" class="field">课程名称:</label> <input type="text" id="course.name" name="course.name" size="20" value="${courseInfo.course.name}" class="required" /> </div> <div> <label for="course.description" class="field">课程介绍:</label> <input type="text" id="course.description" name="course.description" size="20" value="${courseInfo.course.description}" class="required" /> </div> <div> <label for="teacher.name" class="field">老师姓名:</label> <input type="text" id="teacher.name" name="teacher.name" size="20" value="${courseInfo.teacher.name}" class="required" /> </div> <div> <label for="teacher.email" class="field">老师Email:</label> <input type="text" id="teacher.email" name="teacher.email" size="20" value="${courseInfo.teacher.email}" class="required" /> </div> <div> <label for="times" class="field">上课时间:</label> <input type="text" id="times[0]" name="times" size="20" value="周一" class="required" /> <input type="text" id="times[1]" name="times" size="20" value="周三" class="required" /> <input type="text" id="times[2]" name="times" size="20" value="周五" class="required" /> </div> <div> <label for="studentList[0].name" class="field">学生1姓名:</label> <input type="text" id="studentList[0].name" name="studentList[0].name" size="20" value="学生1姓名" class="required" /> </div> <div> <label for="studentList[0].email" class="field">学生1Email:</label> <input type="text" id="studentList[0].email" name="studentList[0].email" size="20" value="学生1Email" class="required" /> </div> <div> <label for="studentList[1].name" class="field">学生2姓名:</label> <input type="text" id="studentList[1].name" name="studentList[1].name" size="20" value="学生2姓名" class="required" /> </div> <div> <label for="studentList[1].email" class="field">学生2Email:</label> <input type="text" id="studentList[0].email" name="studentList[1].email" size="20" value="学生2Email" class="required" /> </div> </fieldset> |
注意：复杂对象在页面元素中各属性的定义规则。
controller 对应的 CourseAction.java 实现修改成如下：
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@RequestMapping(params = { "method=save" }) @ResponseBody public String save(Model model, ModelAndView mv, CourseInfo courseInfo, RedirectAttributes redirectAttributes) { System.out.println("course >> " + courseInfo.getCourse()); System.out.println("teacher >> " + courseInfo.getTeacher()); for (String time : courseInfo.getTimes()) { System.out.println("time >> " + time); } for (Student student : courseInfo.getStudentList()) { System.out.println("student >> " + student); } System.out.println("courseInfo >> " + courseInfo); String message = "save"; redirectAttributes.addFlashAttribute("message", message); return message; } |
controller中的部分方法省略，这里主要测试下页面数据绑定的结果，测试过程如下：
表单输入内容如下图：
提交后，控制台输出日志如下：
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course >> com.micmiu.demo.web.v2.demo.entity.Course@e11326[name=课程名称,description=课程介绍,id=<null>] teacher >> com.micmiu.demo.web.v2.demo.entity.Teacher@b03bd5[name=老师姓名,email=老师Email,grade=<null>,id=<null>] time >> 周一 time >> 周三 time >> 周五 student >> com.micmiu.demo.web.v2.demo.entity.Student@13cd6aa[name=学生1姓名,email=学生1Email,className=<null>,id=<null>] student >> com.micmiu.demo.web.v2.demo.entity.Student@13137a2[name=学生2姓名,email=学生2Email,className=<null>,id=<null>] courseInfo >> com.micmiu.demo.web.v2.demo.vo.CourseInfo@ce4be6[course=com.micmiu.demo.web.v2.demo.entity.Course@e11326[name=课程名称,description=课程介绍,id=<null>],teacher=com.micmiu.demo.web.v2.demo.entity.Teacher@b03bd5[name=老师姓名,email=老师Email,grade=<null>,id=<null>],times={周一,周三,周五},studentList=[com.micmiu.demo.web.v2.demo.entity.Student@13cd6aa[name=学生1姓名,email=学生1Email,className=<null>,id=<null>], com.micmiu.demo.web.v2.demo.entity.Student@13137a2[name=学生2姓名,email=学生2Email,className=<null>,id=<null>]]] |
从日志中可以看出:不管是string数组对象times 还是复杂列表对象 studentList，数据绑定准确无误。
本文介绍到此结束@Michael Sun.
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