Spring MVC数据绑定大全

刚开始用spring mvc 做web开发时,经常会不知道如何合适绑定页面数据.用惯struts2的朋友更认为spring mvc 绑定数据不如struts2方便(本人最开始也是这么认为),经过一段时间的应用和测试,总结出以下几种情况,希望对刚接触spring mvc 的朋友有所帮助.

示例程序下载

查看spring源码可以看出spring支持转换的数据类型已经很多了.

 

org.springframework.beans.PropertyEditorRegistrySupport.java

/** * Actually register the default editors for this registry instance. */private void doRegisterDefaultEditors() {this.defaultEditors = new HashMap<Class, PropertyEditor>(64);// Simple editors, without parameterization capabilities.// The JDK does not contain a default editor for any of these target types.this.defaultEditors.put(Charset.class, new CharsetEditor());this.defaultEditors.put(Class.class, new ClassEditor());this.defaultEditors.put(Class[].class, new ClassArrayEditor());this.defaultEditors.put(Currency.class, new CurrencyEditor());this.defaultEditors.put(File.class, new FileEditor());this.defaultEditors.put(InputStream.class, new InputStreamEditor());this.defaultEditors.put(Locale.class, new LocaleEditor());this.defaultEditors.put(Pattern.class, new PatternEditor());this.defaultEditors.put(Properties.class, new PropertiesEditor());this.defaultEditors.put(Resource[].class, new ResourceArrayPropertyEditor());this.defaultEditors.put(TimeZone.class, new TimeZoneEditor());this.defaultEditors.put(URI.class, new URIEditor());this.defaultEditors.put(URL.class, new URLEditor());// Default instances of collection editors.// Can be overridden by registering custom instances of those as custom editors.this.defaultEditors.put(Collection.class, new CustomCollectionEditor(Collection.class));this.defaultEditors.put(Set.class, new CustomCollectionEditor(Set.class));this.defaultEditors.put(SortedSet.class, new CustomCollectionEditor(SortedSet.class));this.defaultEditors.put(List.class, new CustomCollectionEditor(List.class));this.defaultEditors.put(SortedMap.class, new CustomMapEditor(SortedMap.class));// Default editors for primitive arrays.this.defaultEditors.put(byte[].class, new ByteArrayPropertyEditor());this.defaultEditors.put(char[].class, new CharArrayPropertyEditor());// The JDK does not contain a default editor for char!this.defaultEditors.put(char.class, new CharacterEditor(false));this.defaultEditors.put(Character.class, new CharacterEditor(true));// Spring's CustomBooleanEditor accepts more flag values than the JDK's default editor.this.defaultEditors.put(boolean.class, new CustomBooleanEditor(false));this.defaultEditors.put(Boolean.class, new CustomBooleanEditor(true));// The JDK does not contain default editors for number wrapper types!// Override JDK primitive number editors with our own CustomNumberEditor.this.defaultEditors.put(byte.class, new CustomNumberEditor(Byte.class, false));this.defaultEditors.put(Byte.class, new CustomNumberEditor(Byte.class, true));this.defaultEditors.put(short.class, new CustomNumberEditor(Short.class, false));this.defaultEditors.put(Short.class, new CustomNumberEditor(Short.class, true));this.defaultEditors.put(int.class, new CustomNumberEditor(Integer.class, false));this.defaultEditors.put(Integer.class, new CustomNumberEditor(Integer.class, true));this.defaultEditors.put(long.class, new CustomNumberEditor(Long.class, false));this.defaultEditors.put(Long.class, new CustomNumberEditor(Long.class, true));this.defaultEditors.put(float.class, new CustomNumberEditor(Float.class, false));this.defaultEditors.put(Float.class, new CustomNumberEditor(Float.class, true));this.defaultEditors.put(double.class, new CustomNumberEditor(Double.class, false));this.defaultEditors.put(Double.class, new CustomNumberEditor(Double.class, true));this.defaultEditors.put(BigDecimal.class, new CustomNumberEditor(BigDecimal.class, true));this.defaultEditors.put(BigInteger.class, new CustomNumberEditor(BigInteger.class, true));// Only register config value editors if explicitly requested.if (this.configValueEditorsActive) {StringArrayPropertyEditor sae = new StringArrayPropertyEditor();this.defaultEditors.put(String[].class, sae);this.defaultEditors.put(short[].class, sae);this.defaultEditors.put(int[].class, sae);this.defaultEditors.put(long[].class, sae);}} 

 

1.基本数据类型

很简单,该怎么写就怎么写.

controller代码

@RequestMappingpublic void test1(String name, Integer age, Double income, Boolean isMarried, String[] interests){System.out.println("简单数据类型绑定=========");System.out.println("名字:" + name);System.out.println("年龄:" + age);System.out.println("收入:" + income);System.out.println("已结婚:" + isMarried);System.out.println("兴趣:");for (String interest : interests){System.out.println(interest);}System.out.println("====================");} 

jsp代码

<form action="test1.do" method="post"><div class="f_left">姓名:</div><div class="f_left"><input name="name" value="张三"/></div><div class="clear"></div><div class="f_left">年龄:</div><div class="f_left"><input name="age" value="20"/></div><div class="clear"></div><div class="f_left">收入:</div><div class="f_left"><input name="income" value="100000"/></div><div class="clear"></div><div class="f_left">结婚:</div><div class="f_left"><input type="radio" name="isMarried" value="true" checked="checked"/>是<input type="radio" name="isMarried" value="false"/>否</div><div class="clear"></div><div class="f_left">兴趣:</div><div class="f_left"><input type="checkbox" name="interests" value="听歌" checked="checked"/>听歌<input type="checkbox" name="interests" value="书法" checked="checked"/>书法<input type="checkbox" name="interests" value="看电影" checked="checked"/>看电影</div><div class="clear"></div><div><input type="submit" value="提交表单"/></div></form> 

 

2.简单对象类型

与基本类型相拟,只不过绑定到对象上更加简洁.(类拟struts的ActionForm)

controller代码

@RequestMappingpublic void test2(User user){System.out.println("简单对象类型绑定=========");System.out.println("名字:" + user.getName());System.out.println("年龄:" + user.getAge());System.out.println("收入:" + user.getIncome());System.out.println("已结婚:" + user.getIsMarried());System.out.println("========================");} 

user代码

public class User {private String name;private Integer age;private Boolean isMarried;private Double income;private String[] interests;public String getName() {return name;}public void setName(String name) {this.name = name;}public Integer getAge() {return age;}public void setAge(Integer age) {this.age = age;}public Boolean getIsMarried() {return isMarried;}public void setIsMarried(Boolean isMarried) {this.isMarried = isMarried;}public Double getIncome() {return income;}public void setIncome(Double income) {this.income = income;}public String[] getInterests() {return interests;}public void setInterests(String[] interests) {this.interests = interests;}} 

jsp代码

<form action="test2.do" method="post"><div class="f_left">姓名:</div><div class="f_left"><input name="name" value="lxf"/></div><div class="clear"></div><div class="f_left">年龄:</div><div class="f_left"><input name="age" value="20"/></div><div class="clear"></div><div class="f_left">收入:</div><div class="f_left"><input name="income" value="100000"/></div><div class="clear"></div><div class="f_left">结婚:</div><div class="f_left"><input type="radio" name="isMarried" value="true" checked="checked"/>是<input type="radio" name="isMarried" value="false"/>否</div><div class="clear"></div><div class="f_left">兴趣:</div><div class="f_left"><input type="checkbox" name="interests" value="听歌" checked="checked"/>听歌<input type="checkbox" name="interests" value="书法" checked="checked"/>书法<input type="checkbox" name="interests" value="看电影" checked="checked"/>看电影</div><div class="clear"></div><div><input type="submit" value="提交表单"/></div></form> 

 

3.List类型绑定

网上很多人都给不出答案,关键在于,List需要绑定在对象(ActionForm),直接写在request-mapping函数的参数是不行的,更重要的一点是要创建对象(ArrayList).

controller代码

@RequestMappingpublic void test3(Club club){System.out.println("list类型绑定=========");System.out.println("会员:");for (User user : club.getUsers()){System.out.println(user.getName());}System.out.println("========================");} 

Club代码

public class Club {private List<User> users = new ArrayList<User>();public List<User> getUsers() {return users;}public void setUsers(List<User> users) {this.users = users;}} 

jsp代码

<form action="test3.do" method="post"><div class="f_left">会员1号:</div><div class="f_left"><input name="users[0].name" value="张三"/></div><div class="clear"></div><div class="f_left">会员2号:</div><div class="f_left"><input name="users[1].name" value="李四"/></div><div class="clear"></div><div class="f_left">会员3号:</div><div class="f_left"><input name="users[2].name" value="王五"/></div><div class="clear"></div><div><input type="submit" value="提交表单"/></div></form> 

 

4.Set类型绑定

与List类型相似,经测试表明,绑定Set数据时,必须先在Set对象中Add相应的数量的模型对象.

controller代码

@RequestMappingpublic void test4(Club2 club){System.out.println("set类型绑定=========");System.out.println("会员:");for (User user : club.getUsers()){System.out.println(user.getName());}System.out.println("========================");}
Club2代码

 public class Club2 {private Set<User> users = new LinkedHashSet<User>();public Club2() {users.add(new User());users.add(new User());users.add(new User());}public Set<User> getUsers() {return users;}public void setUsers(Set<User> users) {this.users = users;}} 

 

jsp代码

<form action="test4.do" method="post"><div class="f_left">会员1号:</div><div class="f_left"><input name="users[0].name" value="张三"/></div><div class="clear"></div><div class="f_left">会员2号:</div><div class="f_left"><input name="users[1].name" value="李四"/></div><div class="clear"></div><div class="f_left">会员3号:</div><div class="f_left"><input name="users[2].name" value="王五"/></div><div class="clear"></div><div><input type="submit" value="提交表单"/></div></form> 

 

5.Map类型绑定

最灵活的一种方式,可无限绑定未定义的参数,注意必须绑定在对象下(ActionForm).

controller代码

@RequestMappingpublic void test5(UserForm userForm){System.out.println("Map类型绑定=========");System.out.println("名字:" + userForm.getUser().get("name"));System.out.println("年龄:" + userForm.getUser().get("age"));System.out.println("收入:" + userForm.getUser().get("income"));System.out.println("已结婚:" + userForm.getUser().get("isMarried"));System.out.println("========================");} 

UserForm.java代码

public class UserForm {private Map<String, String> userMap = new LinkedHashMap<String, String>();private User user = new User();public Map<String, String> getUserMap() {return userMap;}public void setUserMap(Map<String, String> userMap) {this.userMap = userMap;}public User getUser() {return user;}public void setUser(User user) {this.user = user;}} 

jsp代码

<form action="test5.do" method="post"><div class="f_left">姓名:</div><div class="f_left"><input name="user['name']" value="张三"/></div><div class="clear"></div><div class="f_left">年龄:</div><div class="f_left"><input name="user['age']" value="20"/></div><div class="clear"></div><div class="f_left">收入:</div><div class="f_left"><input name="user['income']" value="100000"/></div><div class="clear"></div><div class="f_left">结婚:</div><div class="f_left"><input type="radio" name="user['isMarried']" value="true" checked="checked"/>是<input type="radio" name="user['isMarried']" value="false"/>否</div><div class="clear"></div><div><input type="submit" value="提交表单"/></div></form> 

 

6.复合类型绑定

controller代码

@RequestMappingpublic void test6(UserForm userForm){System.out.println("复合类型绑定=========");System.out.println("名字:" + userForm.getUser().getName());System.out.println("年龄:" + userForm.getUser().getAge());System.out.println("收入:" + userForm.getUser().getIncome());System.out.println("已结婚:" + userForm.getUser().getIsMarried());System.out.println("========================");} 

UserForm代码

public class UserForm {private Map<String, String> userMap = new LinkedHashMap<String, String>();private User user = new User();public Map<String, String> getUserMap() {return userMap;}public void setUserMap(Map<String, String> userMap) {this.userMap = userMap;}public User getUser() {return user;}public void setUser(User user) {this.user = user;}} 

jsp代码

<form action="test6.do" method="post"><div class="f_left">姓名:</div><div class="f_left"><input name="user.name" value="张三"/></div><div class="clear"></div><div class="f_left">年龄:</div><div class="f_left"><input name="user.age" value="20"/></div><div class="clear"></div><div class="f_left">收入:</div><div class="f_left"><input name="user.income" value="100000"/></div><div class="clear"></div><div class="f_left">结婚:</div><div class="f_left"><input type="radio" name="user.isMarried" value="true" checked="checked"/>是<input type="radio" name="user.isMarried" value="false"/>否</div><div class="clear"></div><div><input type="submit" value="提交表单"/></div></form>