使用Spring MVC

Question

我有一个带有textarea输入inputTextA和inputTexB的Spring表单 我需要将这些输入绑定到以下Model对象：

public class Model{
    private List<String> listA;
    private List<CustomObject> listB;
    // getters and setters
}

我读到如果我实现Converter接口并在Spring配置类上注册实现，Spring就能自动进行转换。所以我希望Spring能够做到以下几点：

• inputA = "12345|67890"已转换为model.listA = {"12345","12345"}
• inputB = "abcd|efgh"已转换为model.listB = {new CustomObject("abcd"),new CustomObject("efgh")}

但我得到以下内容：

• inputA = "12345|67890"已转换为model.listA = {(new CustomObject("12345")).toString(),(new CustomObject("67890")).toString()}
• inputB = "abcd|efgh"已转换为model.listB = {new CustomObject("abcd"),new CustomObject("efgh")}

我为每个列表实现了Converter Interface，如下所示：

public class StringToStringListConverter implements Converter<String, List<String>>{
    @Override
    public List<String> convert(String source){
        List<String> result = null;
        // Conversion logic.
        return result;
    }
}

，

public class StringToCustomObjectListConverter implements Converter<String, List<CustomObject>>{
    @Override
    public List<CustomObject> convert(String source){
        List<CustomObject> result = null;
        // Conversion logic.
        return result;
    }
}

并在Spring Configuration类上注册每个转换器，覆盖addFormatter方法。

@Override
public void addFormatter(FormatterRegistry registry){
    registry.addConverter(new StringToStringListConverter());
    registry.addConverter(new StringToCustomObjectListConverter());
}

我有以下观点。

<div class="form-group row">
    <label for="inputTextAId" class="col-form-label col-sm-2">
        <spring:message code="labelAText"/>
    </label>
    <div class="col-sm-10">
        <form:textarea id="inputTextAId"
                    class="form-control"
                    rows="3"
                    path="model.stringListA">
        </form:textarea>
    </div>
</div>

<div class="form-group row">
    <label for="inputTextBId" class="col-form-label col-sm-2">
        <spring:message code="labelBText"/>
    </label>
    <div class="col-sm-10">
        <form:textarea id="structuresId" 
                       class="form-control"
                       rows="3"
                       path="model.stringListB">
        </form:textarea>
    </div>
</div>