springMVC中复杂嵌套对象、List等集合类型数据绑定

目录：

1. 概述
2. 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 & lt ; Student & gt ; 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 & lt ; Student & gt ; getStudentList ( ) { return studentList ; }   public void setTimes ( String [ ] times ) { this . times = times ; }   public void setStudentList ( List & lt ; Student & gt ; 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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& lt ; form : form id = "input-form" modelAttribute = "courseInfo" action = "${ctx}/demo/course.do?method=save" method = "post" & gt ; & lt ; input type = "hidden" name = "id" value = "${course.id}" / & gt ; & lt ; fieldset class = "prepend-top" & gt ; & lt ; legend & gt ;课程信息 & lt ; / legend & gt ; & lt ; div id = "messageBox" class = "error-msg" style = "display: none" & gt ;输入有误，请先更正。 & lt ; / div & gt ; & lt ; div & gt ; & lt ; label for = "course.name" class = "field" & gt ;课程名称 : & lt ; / label & gt ; & lt ; input type = "text" id = "course.name" name = "course.name" size = "20" value = "${courseInfo.course.name}" class = "required" / & gt ; & lt ; / div & gt ; & lt ; div & gt ; & lt ; label for = "course.description" class = "field" & gt ;课程介绍 : & lt ; / label & gt ; & lt ; input type = "text" id = "course.description" name = "course.description" size = "20" value = "${courseInfo.course.description}" class = "required" / & gt ; & lt ; / div & gt ;   & lt ; div & gt ; & lt ; label for = "teacher.name" class = "field" & gt ;老师姓名 : & lt ; / label & gt ; & lt ; input type = "text" id = "teacher.name" name = "teacher.name" size = "20" value = "${courseInfo.teacher.name}" class = "required" / & gt ; & lt ; / div & gt ; & lt ; div & gt ; & lt ; label for = "teacher.email" class = "field" & gt ;老师 Email : & lt ; / label & gt ; & lt ; input type = "text" id = "teacher.email" name = "teacher.email" size = "20" value = "${courseInfo.teacher.email}" class = "required" / & gt ; & lt ; / div & gt ; & lt ; div & gt ; & lt ; label for = "times" class = "field" & gt ;上课时间 : & lt ; / label & gt ; & lt ; input type = "text" id = "times[0]" name = "times" size = "20" value = "周一" class = "required" / & gt ; & lt ; input type = "text" id = "times[1]" name = "times" size = "20" value = "周三" class = "required" / & gt ; & lt ; input type = "text" id = "times[2]" name = "times" size = "20" value = "周五" class = "required" / & gt ; & lt ; / div & gt ;   & lt ; div & gt ; & lt ; label for = "studentList[0].name" class = "field" & gt ;学生 1姓名 : & lt ; / label & gt ; & lt ; input type = "text" id = "studentList[0].name" name = "studentList[0].name" size = "20" value = "学生1姓名" class = "required" / & gt ; & lt ; / div & gt ; & lt ; div & gt ; & lt ; label for = "studentList[0].email" class = "field" & gt ;学生 1Email : & lt ; / label & gt ; & lt ; input type = "text" id = "studentList[0].email" name = "studentList[0].email" size = "20" value = "学生1Email" class = "required" / & gt ; & lt ; / div & gt ; & lt ; div & gt ; & lt ; label for = "studentList[1].name" class = "field" & gt ;学生 2姓名 : & lt ; / label & gt ; & lt ; input type = "text" id = "studentList[1].name" name = "studentList[1].name" size = "20" value = "学生2姓名" class = "required" / & gt ; & lt ; / div & gt ; & lt ; div & gt ; & lt ; label for = "studentList[1].email" class = "field" & gt ;学生 2Email : & lt ; / label & gt ; & lt ; input type = "text" id = "studentList[0].email" name = "studentList[1].email" size = "20" value = "学生2Email" class = "required" / & gt ; & lt ; / div & gt ; & lt ; / fieldset & gt ;

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 & gt ; & gt ; com . micmiu . demo . web . v2 . demo . entity . Course @ e11326 [ name =课程名称 , description =课程介绍 , id =& lt ; null & gt ; ] teacher & gt ; & gt ; com . micmiu . demo . web . v2 . demo . entity . Teacher @ b03bd5 [ name =老师姓名 , email =老师 Email , grade =& lt ; null & gt ; , id =& lt ; null & gt ; ] time & gt ; & gt ; 周一 time & gt ; & gt ; 周三 time & gt ; & gt ; 周五 student & gt ; & gt ; com . micmiu . demo . web . v2 . demo . entity . Student @ 13cd6aa [ name =学生 1姓名 , email =学生 1Email , className =& lt ; null & gt ; , id =& lt ; null & gt ; ] student & gt ; & gt ; com . micmiu . demo . web . v2 . demo . entity . Student @ 13137a2 [ name =学生 2姓名 , email =学生 2Email , className =& lt ; null & gt ; , id =& lt ; null & gt ; ] courseInfo & gt ; & gt ; 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 =& lt ; null & gt ; ] , teacher = com . micmiu . demo . web . v2 . demo . entity . Teacher @ b03bd5 [ name =老师姓名 , email =老师 Email , grade =& lt ; null & gt ; , id =& lt ; null & gt ; ] , 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 =& lt ; null & gt ; , id =& lt ; null & gt ; ] , com . micmiu . demo . web . v2 . demo . entity . Student @ 13137a2 [ name =学生 2姓名 , email =学生 2Email , className =& lt ; null & gt ; , id =& lt ; null & gt ; ] ] ]

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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