Spring 3 MVC-高级数据绑定-带有简单对象列表的表单请求 [英] Spring 3 MVC - Advanced Data Binding - Form Request with List of Simple Objects

问题描述

我已经阅读了所有Spring 3 Web文档:

I've read through all of the Spring 3 Web docs: http://static.springsource.org/spring/docs/3.0.x/spring-framework-reference/html/spring-web.html but have been completely unable to find any interesting documentation on binding more complicated request data, for example, let's say I use jQuery to post to a controller like so:

$.ajax({
    url: 'controllerMethod',
    type: "POST",
    data : {
        people : [
        {
            name:"dave", 
            age:"15"
        } ,
{
            name:"pete", 
            age:"12"
        } ,
{
            name:"steve", 
            age:"24"
        } ]
    },
    success: function(data) {
        alert('done');
    }
});

我如何通过控制器接受它?最好不必创建自定义对象，我只希望能够使用简单的数据类型，但是如果我需要自定义对象来简化事情，那也可以.

How can I accept that through the controller? Preferably without having to create a custom object, I'd rather just be able to use simple data-types, however if I need custom objects to make things simpler, I'm fine with that too.

让您入门:

@RequestMapping("/controllerMethod", method=RequestMethod.POST)
public String doSomething() {
    System.out.println( wantToSeeListOfPeople );
}

不用担心这个问题的答复，我关心的只是处理请求，我知道如何处理答复.

Don't worry about the response for this question, all I care about is handling the request, I know how to deal with the responses.

我有更多的示例代码，但我无法使它正常工作，我在这里错过了什么?

I've got more sample code, but I can't get it to work, what am I missing here?

选择javascript:

select javascript:

var person = new Object();
    person.name = "john smith";
    person.age = 27;

    var jsonPerson = JSON.stringify(person);

    $.ajax({
        url: "test/serialize",
        type : "POST",
        processData: false,
        contentType : 'application/json',
        data: jsonPerson,
        success: function(data) {
            alert('success with data : ' + data);
        },
        error : function(data) {
            alert('an error occurred : ' + data);
        }
    });

控制器方法:

public static class Person {

        public Person() {
        }

        public Person(String name, Integer age) {
            this.name = name;
            this.age = age;
        }
        String name;
        Integer age;

        public Integer getAge() {
            return age;
        }

        public void setAge(Integer age) {
            this.age = age;
        }

        public String getName() {
            return name;
        }

        public void setName(String name) {
            this.name = name;
        }
    }

    @RequestMapping(value = "/serialize")
        @ResponseBody
        public String doSerialize(@RequestBody Person body) {
            System.out.println("body : " + body);
            return body.toString();
        }

这将导致以下异常:

org.springframework.web.HttpMediaTypeNotSupportedException: 内容类型"application/json"不是 支持

org.springframework.web.HttpMediaTypeNotSupportedException: Content type 'application/json' not supported

如果doSerialize()方法采用String而不是Person，则请求成功，但是String为空

If the doSerialize() method takes a String as opposed to a Person, the request is successful, but the String is empty

推荐答案

您的jQuery ajax调用会产生以下application/x-www-form-urlencoded请求正文(采用％解码形式):

Your jQuery ajax call produces the following application/x-www-form-urlencoded request body (in %-decoded form):

people[0][name]=dave&people[0][age]=15&people[1][name]=pete&people[1][age]=12&people[2][name]=steve&people[2][age]=24

Spring MVC可以将以数字索引的属性绑定到List，将以字符串索引的属性绑定到Map.您在这里需要自定义对象，因为@RequestParam不支持复杂类型.因此，您有:

Spring MVC can bind properties indexed with numbers to Lists and properties indexed with strings to Maps. You need the custom object here because @RequestParam doesn't support complex types. So, you have:

public class People {
    private List<HashMap<String, String>> people;

    ... getters, setters ...
}

@RequestMapping("/controllerMethod", method=RequestMethod.POST)        
public String doSomething(People people) {        
    ...
} 

您还可以在发送数据之前将数据序列化为JSON，然后按照Bozho的建议使用@RequestBody.您可以在 mvc-showcase示例中找到此方法的示例. .

You can also serialize data into JSON before sending them and then use a @RequestBody, as Bozho suggests. You may find an example of this approach in the mvc-showcase sample.

这篇关于Spring 3 MVC-高级数据绑定-带有简单对象列表的表单请求的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！