spring mvc 参数绑定

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我是靠谱客的博主欢呼烧鹅，最近开发中收集的这篇文章主要介绍spring mvc 参数绑定，觉得挺不错的，现在分享给大家，希望可以做个参考。

概述

转自:http://blog.csdn.net/lxf9601/article/details/5925810

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

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/** 
     * 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

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@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

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<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

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@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

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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

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<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

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@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

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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

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<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

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@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

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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

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<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

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@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

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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

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<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

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@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

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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

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<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>  