Java 如何在SpringMVC中定义基于url扩展的消息转换器?
我如何影响在AnnotationMethodHandlerAdapter中为url扩展生成的POJO选择消息转换器的过程? 我希望有一个数据对象的更多表示,而数据表示应该由请求的url扩展选择,例如/users/2.xml或/users/2.json 消息处理程序的当前配置,应根据url扩展选择:Java 如何在SpringMVC中定义基于url扩展的消息转换器?,java,spring,spring-mvc,Java,Spring,Spring Mvc,我如何影响在AnnotationMethodHandlerAdapter中为url扩展生成的POJO选择消息转换器的过程? 我希望有一个数据对象的更多表示,而数据表示应该由请求的url扩展选择,例如/users/2.xml或/users/2.json 消息处理程序的当前配置,应根据url扩展选择: <bean class="org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter">
<bean class="org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter">
<property name="messageConverters">
<list>
<bean class="org.springframework.http.converter.json.MappingJacksonHttpMessageConverter" />
<bean class="org.springframework.http.converter.xml.MarshallingHttpMessageConverter"
p:marshaller-ref="xmlMarshaller" p:unmarshaller-ref="xmlMarshaller" />
</list>
</property>
</bean>
有一种方法,我非常熟悉,那就是使用,但是我想绕过视图分辨率的过程,直接使用消息转换器。此外,在创建操作时,在public ResponseEntity showUser中使用ResponseEntity可对生成的http状态代码定义进行细粒度控制OK、NOT_FOUND、NO_CONTENT、。。。我找不到将ResponseEntity与ContentNegotiatingViewResolver结合使用的方法,这也能满足我的需求
另一种方法是根据url扩展将请求接受头修改为application/xml或application/json。这样,所有处理都应直接转到已配置的消息转换器。但是,我不知道如何合理地篡改请求头
谢谢。由于choose of HttpMessageConverters使用Accept请求标头,因此实现内容协商的最简单方法可能是将此标头替换为URL扩展指定的所需媒体类型
这可以实现为使用HttpServletRequestWrapper替换头值的过滤器,也可以按照Spring 3.0.2中的建议重写AnnotationMethodHanlderAdapter.createHttpInputMessage
另请参见。我也有同样的需要,并拼凑了一个servlet过滤器来完成这项任务。不是一件艺术品,但能完成工作:
public class UrlExtensionFilter implements Filter {
public void init(FilterConfig filterConfig) throws ServletException {
}
public void doFilter(ServletRequest request, ServletResponse response, FilterChain filterChain) throws IOException, ServletException {
HttpServletRequest httpServletRequest = (HttpServletRequest)request;
if (httpServletRequest.getRequestURI().endsWith(".json")) {
MyAcceptHeaderRequest acceptHeaderRequest = new MyAcceptHeaderRequest(httpServletRequest);
acceptHeaderRequest.setAcceptHeader("application/json");
filterChain.doFilter(acceptHeaderRequest, response);
} else if (httpServletRequest.getRequestURI().endsWith(".xml")) {
MyAcceptHeaderRequest acceptHeaderRequest = new MyAcceptHeaderRequest(httpServletRequest);
acceptHeaderRequest.setAcceptHeader("text/xml");
filterChain.doFilter(acceptHeaderRequest, response);
} else {
filterChain.doFilter(request, response);
}
}
public void destroy() {
}
public class MyAcceptHeaderRequest extends HttpServletRequestWrapper {
private String accept = "application/json";
public MyAcceptHeaderRequest(HttpServletRequest request) throws IOException {
super(request);
}
public void setAcceptHeader(String value) {
accept = value;
}
@Override
public String getHeader(String name) {
if (name.equalsIgnoreCase("accept") || name.equalsIgnoreCase("content-type")) {
return accept;
} else {
return super.getHeader(name);
}
}
@Override
public Enumeration getHeaders(String name) {
if (name.equalsIgnoreCase("accept") || name.equalsIgnoreCase("content-type")) {
Enumeration enumeration = new StringTokenizer(accept);
return enumeration;
} else {
return super.getHeaders(name);
}
}
@Override
public String getContentType() {
return accept;
}
@Override
public String getParameter(String name) {
// When we're using this class and it is a POST operation then the body is JSON or XML so don't allow
// attempts to retrieve parameter names to consume the input stream
if (this.getMethod().equals("POST")) {
return null;
} else {
return super.getParameter(name);
}
}
@Override
public String[] getParameterValues(String name) {
// When we're using this class and it is a POST operation then the body is JSON or XML so don't allow
// attempts to retrieve parameter names to consume the input stream
if (this.getMethod().equals("POST")) {
return null;
} else {
return super.getParameterValues(name);
}
}
}
}
谢谢,你救了我一天:走SPR-7517路