我正在使用Resteasy实现一个Restfull服务,它将由Extjs客户端使用,我想在http响应中使用更多属性修饰检索的json对象,而不使用服务方法中包含其他属性的包装类或压倒JacksonJsonProvider
例如:
原始对象:
{
"id":"1",
"name":"Diego"
}
装饰物品:
{
"success":"true",
"root":{
"id":"1",
"name":"Diego"
}
}
我找到JAXB Decorators但我无法为json类型实现装饰器。
我尝试使用Interceptors替换将使用包装器序列化的实体,但是如果替换作为Collection的实体则不起作用。
有什么建议吗?
答案 0 :(得分:1)
您可以编写一个拦截器,在将JSON响应传递给客户端之前将其包装起来。这是一个示例代码:
定义自定义HTTPServletResponseWrapper
public class MyResponseWrapper extends HttpServletResponseWrapper {
private ByteArrayOutputStream byteStream;
public MyResponseWrapper(HttpServletResponse response, ByteArrayOutputStream byteStream) {
super(response);
this.byteStream = byteStream;
}
@Override
public ServletOutputStream getOutputStream() throws IOException {
return new ServletOutputStream() {
@Override
public void write(int b) throws IOException {
byteStream.write(b);
}
};
}
@Override
public PrintWriter getWriter() throws IOException {
return new PrintWriter(byteStream);
}
}
定义过滤器类:
@WebFilter("/rest/*")
public class JSONResponseFilter implements Filter {
private final String JSON_RESPONSE = " { \"success\":\"true\", \"root\": ";
private final String JSON_RESPONSE_CLOSE = "}";
/* .. */
@Override
public void doFilter(ServletRequest request, ServletResponse response,
FilterChain chain) throws IOException, ServletException {
// capture result in byteStream by using custom responseWrapper
final HttpServletResponse httpResponse = (HttpServletResponse) response;
final ByteArrayOutputStream byteStream = new ByteArrayOutputStream();
HttpServletResponseWrapper responseWrapper = new MyResponseWrapper(httpResponse, byteStream);
// do normal processing but capture results in "byteStream"
chain.doFilter(request, responseWrapper);
// finally, wrap response with custom JSON
// you can do fancier stuff here, but you get the idea
out.write(JSON_RESPONSE.getBytes());
out.write(byteStream.toByteArray());
out.write(JSON_RESPONSE_CLOSE.getBytes());
}
}