@RequestBody和春天@ResponseBody

问题描述

有一个人在春季3说明 @RequestBody 和 @ResponseBody ？
他们是为了什么？一个例子是好的。

Can some one explain @RequestBody and @ResponseBody in Spring 3?What are they for? An example would be nice.

推荐答案

有在文档一整节名为16.3.3.4映射请求体与@RequestBody注释。而一个叫16.3.3.5映射响应主体与注释@ResponseBody 。我建议你​​向那些部分。也与此有关：<一href=\"http://static.springsource.org/spring/docs/current/javadoc-api/index.html?org/springframework/web/bind/annotation/RequestBody.html\"><$c$c>@RequestBody的javadoc，<一个href=\"http://static.springsource.org/spring/docs/current/javadoc-api/index.html?org/springframework/web/bind/annotation/ResponseBody.html\"><$c$c>@ResponseBody的javadoc

There is a whole Section in the docs called 16.3.3.4 Mapping the request body with the @RequestBody annotation. And one called 16.3.3.5 Mapping the response body with the @ResponseBody annotation. I suggest you consult those sections. Also relevant: @RequestBody javadocs, @ResponseBody javadocs

使用的例子是这样的：

使用JavaScript库像jQuery，你会发布一个JSON对象是这样的：

Using a JavaScript-library like JQuery, you would post a JSON-Object like this:

{ "firstName" : "Elmer", "lastName" : "Fudd" }

您控制器的方法是这样的：

Your controller method would look like this:

// controller
@ResponseBody @RequestMapping("/description")
public Description getDescription(@RequestBody UserStats stats){
    return new Description(stats.getFirstName() + " " + stats.getLastname() + " hates wacky wabbits");
}

// domain / value objects
public class UserStats{
    private String firstName;
    private String lastName;
    // + getters, setters
}
public class Description{
    private String description;
    // + getters, setters, constructor
}

现在，如果你有（并有<$c$c><mvc:annotation-driven>设置），春季将传入的JSON转换成从后身体UserStats对象（因为你添加的 @RequestBody 注释），它会序列化返回的对象为JSON（因为您添加的 @ResponseBody 注释）。所以浏览器/客户将会看到此JSON结果：

Now if you have Jackson on your classpath (and have an <mvc:annotation-driven> setup), Spring would convert the incoming JSON to a UserStats object from the post body (because you added the @RequestBody annotation) and it would serialize the returned object to JSON (because you added the @ResponseBody annotation). So the Browser / Client would see this JSON result:

{ "description" : "Elmer Fudd hates wacky wabbits" }

请参阅我的一个完整的工作示例的这一previous答案：

See this previous answer of mine for a complete working example: http://stackoverflow.com/a/5908632/342852

注：RequestBody / ResponseBody当然不限于JSON的，既可以处理多种格式，包括纯文本和XML，JSON，但可能是最常用的格式

Note: RequestBody / ResponseBody is of course not limited to JSON, both can handle multiple formats, including plain text and XML, but JSON is probably the most used format.

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