Spring 3 MVC - 高级数据绑定 - 带有简单对象列表的表单请求
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Spring 3 MVC - Advanced Data Binding - Form Request with List of Simple Objects
提问by walnutmon
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.htmlbut 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:
我已经通读了所有 Spring 3 Web 文档：http: //static.springsource.org/spring/docs/3.0.x/spring-framework-reference/html/spring-web.html但完全无法找到任何关于绑定更复杂的请求数据的有趣文档，例如，假设我使用 jQuery 发布到控制器，如下所示：
$.ajax({
url: 'controllerMethod',
type: "POST",
data : {
people : [
{
name:"dave",
age:"15"
} ,
{
name:"pete",
age:"12"
} ,
{
name:"steve",
age:"24"
} ]
},
success: function(data) {
alert('done');
}
});
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.
我怎样才能通过控制器接受它？最好不必创建自定义对象，我宁愿能够使用简单的数据类型，但是如果我需要自定义对象来使事情变得更简单，我也可以。
To get you started:
让您开始：
@RequestMapping("/controllerMethod", method=RequestMethod.POST)
public String doSomething() {
System.out.println( wantToSeeListOfPeople );
}
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.
不要担心这个问题的回应，我关心的只是处理请求，我知道如何处理回应。
EDIT:
编辑：
I've got more sample code, but I can't get it to work, what am I missing here?
我有更多示例代码，但我无法让它工作，我在这里错过了什么？
select javascript:
选择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);
}
});
controller method:
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();
}
this renders the following exception:
这会导致以下异常：
org.springframework.web.HttpMediaTypeNotSupportedException: Content type 'application/json' not supported
org.springframework.web.HttpMediaTypeNotSupportedException：不支持内容类型“应用程序/json”
If the doSerialize() method takes a String as opposed to a Person, the request is successful, but the String is empty
如果 doSerialize() 方法采用 String 而不是 Person，则请求成功，但 String 为空
回答by axtavt
Your jQuery ajax call produces the following application/x-www-form-urlencodedrequest body (in %-decoded form):
您的 jQuery ajax 调用生成以下application/x-www-form-urlencoded请求正文（以 %-decoded 形式）：
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 can bind properties indexed with numbers to Lists and properties indexed with strings to Maps. You need the custom object here because @RequestParamdoesn't support complex types. So, you have:
Spring MVC 可以将数字索引的属性绑定到Lists，将字符串索引的属性绑定到Maps。此处需要自定义对象，因为@RequestParam不支持复杂类型。所以你有了：
public class People {
private List<HashMap<String, String>> people;
... getters, setters ...
}
@RequestMapping("/controllerMethod", method=RequestMethod.POST)
public String doSomething(People people) {
...
}
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.
您还可以在发送数据之前将数据序列化为 JSON，然后@RequestBody按照 Bozho 的建议使用 。您可以在mvc-showcase sample 中找到这种方法的示例。
回答by Bozho
if you have <mvc:annotation-driven>enabled then:
如果您已<mvc:annotation-driven>启用，则：
@RequestMapping("/controllerMethod", method=RequestMethod.POST)
public String doSomething(@RequestBody List<Person> people) {
System.out.println( wantToSeeListOfPeople );
}
(List<Person>might not be the structure you would like to obtain, it's just an example here)
（List<Person>可能不是您想要获得的结构，这里只是一个示例）
You can try setting the Content-Typeof $.ajaxto be application/json, if it doesn't work immediately.
你可以尝试设置Content-Type的$.ajax是application/json，如果不立即工作。
回答by Adam Gent
Have a look at Hymanson's spring integration. It is incredible easy to use and powerful.
看看Hymanson的 spring 集成。它非常易于使用且功能强大。
A question/answer on SO that can help guide on this: Spring 3.0 making JSON response using Hymanson message converter
关于 SO 的一个问题/答案可以帮助指导这个问题： Spring 3.0 making JSON response using Hymanson message converter
