Spring 3.0 使用 jackson 消息转换器制作 JSON 响应 [英] Spring 3.0 making JSON response using jackson message converter

问题描述

我将我的 messageconverter 配置为 Jackson's then

i configure my messageconverter as Jackson's then

class Foo{int x; int y}

在控制器中

@ResponseBody
public Foo method(){
   return new Foo(3,4)
}

我希望从服务器返回一个 JSON 字符串 {x:'3',y:'4'} 而没有任何其他配置.但是对我的 ajax 请求收到 404 错误响应

from that i m expecting to return a JSON string {x:'3',y:'4'} from server without any other configuration. but getting 404 error response to my ajax request

如果方法被@ResponseBody注解，则返回类型写入响应HTTP主体.返回值将使用 HttpMessageConverters 转换为声明的方法参数类型.

If the method is annotated with @ResponseBody, the return type is written to the response HTTP body. The return value will be converted to the declared method argument type using HttpMessageConverters.

我错了吗?或者我应该使用序列化程序将我的响应对象转换为 Json 字符串，然后将该字符串作为响应返回.(我可以正确地进行字符串响应)还是应该进行一些其他配置?比如为 Foo 类添加注释

Am I wrong ? or should I convert my response Object to Json string myself using serializer and then returning that string as response.(I could make string responses correctly) or should I make some other configurations ? like adding annotations for class Foo

这是我的 conf.xml

here is my conf.xml

<bean id="jacksonMessageConverter" class="org.springframework.http.converter.json.MappingJacksonHttpMessageConverter">

  <bean class="org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter">
<property name="messageConverters">
  <list>
    <ref bean="jacksonMessageConverter"/>
  </list>
</property>

推荐答案

您需要:

1. 设置注解驱动的编程模型:将<mvc:annotation-driven/>放入spring.xml
2. 将 jaskson jar(Maven artifactId 是 org.codehaus.jackson:jackson-mapper-asl)放在类路径中.

3. 如下使用:

1. Set annotation-driven programming model: put <mvc:annotation-driven /> in spring.xml
2. Place jaskson jar (Maven artifactId is org.codehaus.jackson:jackson-mapper-asl) in classpath.

3. Use as the following:

@RequestMapping(method = { RequestMethod.GET, RequestMethod.POST })
public @ResponseBody Foo method(@Valid Request request, BindingResult result){
return new Foo(3,4)
}

这对我有用.

请注意，

1. @ResponseBody 应用于返回类型，而不是方法定义.
2. 您需要 @RequestMapping 注释，以便 Spring 检测到它.

1. @ResponseBody is applied to return type, not to the method definition.
2. You need @RequestMapping annotation, so that Spring will detect it.

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