springMVC中复杂嵌套对象、List等集合类型数据绑定

作者: Michael 日期: 2013 年 3 月 5 日发表评论 (0) 查看评论

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：

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);
	}
}

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 :

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);
	}
}

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：

<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>

<form:form id="input-form" modelAttribute="courseInfo"

action="${ctx}/demo/course.do?method=save" method="post">

<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：

@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;
}

@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：

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>]]]

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.

原创文章，转载请注明： 转载自micmiu – 软件开发+生活点滴[ http://www.micmiu.com/ ]

本文链接地址: http://www.micmiu.com/j2ee/spring/springmvc-view-complex/

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