Spring MVC数据绑定大全-优快云博客

本文详细介绍SpringMVC中各种数据类型的绑定方法，包括基本数据类型、简单对象类型、List、Set、Map以及复合类型的绑定，并提供具体示例。

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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

@RequestMapping public 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

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

@RequestMapping public 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

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

@RequestMapping public 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

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

@RequestMapping public 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

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

@RequestMapping public 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

6.复合类型绑定

controller代码

@RequestMapping public 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

jsp代码