spring mvc 数据绑定总结

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

<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

@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

<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

@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

<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

@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

<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

@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

<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

@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

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>