如何用Resteasy裝飾json響應

我正在實施Resteasy的restfull服務，該服務將由Extjs客戶端使用，並且我想用一些更多屬性修飾在http響應中檢索到的json對象而不使用包裝類與在服務方法或重載JacksonJsonProvider
實施例的附加屬性：如何用Resteasy裝飾json響應

原始對象：

{ 
    "id":"1", 
    "name":"Diego" 
}

裝飾對象：

{ 
    "success":"true", 
    "root":{ 
      "id":"1", 
      "name":"Diego" 
      } 
}

我發現JAXB Decorators但我無法實現json類型的裝飾器。

我試圖用Interceptors代替將用包裝器序列化的實體，但如果替換爲集合的實體則不起作用。

有什麼建議嗎？

來源

2012-04-16 Diego Lins de Freitas

您可以在傳遞給客戶端之前編寫一個封裝了JSON響應的攔截器。下面是一個例子代碼：

定義自定義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); 
    } 
}

定義過濾器類：

@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()); 
    } 
}

來源

2012-12-24 00:22:47 donramos

如何用Resteasy裝飾json響應

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