org.apache.struts2.json

## Class JSONInterceptor

- java.lang.Object
- - com.opensymphony.xwork2.interceptor.AbstractInterceptor
  - - org.apache.struts2.json.JSONInterceptor

- All Implemented Interfaces:
    ConditionalInterceptor, Interceptor, Serializable

      public class JSONInterceptor
      extends AbstractInterceptor

  Populates an action from a JSON string
  See Also:
    Serialized Form

- - ### Constructor Summary

    Constructors
    Constructor and Description
    `JSONInterceptor()`

  - ### Method Summary

    All Methods Instance Methods Concrete Methods
    Modifier and Type | Method and Description
    --- | ---
    `protected String` | `addCallbackIfApplicable(javax.servlet.http.HttpServletRequest request, String json)`
    `String` | `getCallbackParameter()`
    `boolean` | `getDebug()`
    `protected List` | `getIncludeProperties()`
    `String` | `intercept(ActionInvocation invocation)`
    `RPCResponse` | `invoke(Object object, Map data)`
    `boolean` | `isEnableGZIP()`
    `boolean` | `isEnableSMD()`
    `boolean` | `isExcludeNullProperties()`
    `boolean` | `isNoCache()`
    `protected String` | `readContentType(javax.servlet.http.HttpServletRequest request)`
    `protected String` | `readContentTypeEncoding(javax.servlet.http.HttpServletRequest request)`
    `void` | `setCallbackParameter(String callbackParameter)`
    `void` | `setDebug(boolean debug)` Turns debugging on or off
    `void` | `setDefaultEncoding(String val)`
    `void` | `setDevMode(String mode)`
    `void` | `setEnableGZIP(boolean enableGZIP)` Setting this property to "true" will compress the output.
    `void` | `setEnableSMD(boolean enableSMD)`
    `void` | `setExcludeNullProperties(boolean excludeNullProperties)`
    `void` | `setExcludeProperties(String commaDelim)` Sets a comma-delimited list of regular expressions to match properties that should be excluded from the JSON output.
    `void` | `setExcludeWildcards(String commaDelim)` Sets a comma-delimited list of wildcard expressions to match properties that should be excluded from the JSON output.
    `void` | `setIgnoreHierarchy(boolean ignoreHierarchy)`
    `void` | `setIgnoreSMDMethodInterfaces(boolean ignoreSMDMethodInterfaces)` Ignore annotations on methods in interfaces You may need to set to this true if your action is a proxy/enhanced as annotations are not inherited
    `void` | `setIncludeProperties(String commaDelim)` Sets a comma-delimited list of regular expressions to match properties that should be included from the JSON output.
    `void` | `setIncludeWildcards(String commaDelim)` Sets a comma-delimited list of wildcard expressions to match properties that should be included from the JSON output.
    `void` | `setJSONCleaner(JSONCleaner dataCleaner)` Sets the JSONCleaner to be used
    `void` | `setJsonContentType(String jsonContentType)`
    `void` | `setJSONPopulator(JSONPopulator populator)` Sets the JSONPopulator to be used
    `void` | `setJsonRpcContentType(String jsonRpcContentType)`
    `void` | `setNoCache(boolean noCache)` Add headers to response to prevent the browser from caching the response
    `void` | `setPrefix(boolean prefix)`
    `void` | `setRoot(String root)` Sets the root object to be deserialized, defaults to the Action
    `void` | `setWrapWithComments(boolean wrapWithComments)` Wrap generated JSON with comments.

    - ### Methods inherited from class com.opensymphony.xwork2.interceptor.AbstractInterceptor

      `destroy, init, setDisabled, shouldIntercept`

    - ### Methods inherited from class java.lang.Object

      `clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

- - ### Constructor Detail

    - #### JSONInterceptor

          public JSONInterceptor()

  - ### Method Detail

    - #### intercept

          public String intercept(ActionInvocation invocation)
                           throws Exception

      Specified by:
        `intercept` in interface `Interceptor`
      Specified by:
        `intercept` in class `AbstractInterceptor`
      Throws:
        `Exception`

    - #### readContentType

          protected String readContentType(javax.servlet.http.HttpServletRequest request)

    - #### readContentTypeEncoding

          protected String readContentTypeEncoding(javax.servlet.http.HttpServletRequest request)

    - #### invoke

          public RPCResponse invoke(Object object,
                                    Map data)
                             throws IllegalArgumentException,
                                    IllegalAccessException,
                                    InvocationTargetException,
                                    JSONException,
                                    InstantiationException,
                                    NoSuchMethodException,
                                    IntrospectionException

      Throws:
        `IllegalArgumentException`
        `IllegalAccessException`
        `InvocationTargetException`
        `JSONException`
        `InstantiationException`
        `NoSuchMethodException`
        `IntrospectionException`

    - #### addCallbackIfApplicable

          protected String addCallbackIfApplicable(javax.servlet.http.HttpServletRequest request,
                                                   String json)

    - #### isEnableSMD

          public boolean isEnableSMD()

    - #### setEnableSMD

          public void setEnableSMD(boolean enableSMD)

    - #### setIgnoreSMDMethodInterfaces

          public void setIgnoreSMDMethodInterfaces(boolean ignoreSMDMethodInterfaces)

      Ignore annotations on methods in interfaces You may need to set to this true if your action is a proxy/enhanced as annotations are not inherited
      Parameters:
        `ignoreSMDMethodInterfaces` - set the flag for ignore SMD method interfaces

    - #### setWrapWithComments

          public void setWrapWithComments(boolean wrapWithComments)

      Wrap generated JSON with comments. Only used if SMD is enabled.
      Parameters:
        `wrapWithComments` - Wrap generated JSON with comments.

    - #### setDefaultEncoding

          public void setDefaultEncoding(String val)

    - #### setIgnoreHierarchy

          public void setIgnoreHierarchy(boolean ignoreHierarchy)

      Parameters:
        `ignoreHierarchy` - Ignore properties defined on base classes of the root object.

    - #### setRoot

          public void setRoot(String root)

      Sets the root object to be deserialized, defaults to the Action
      Parameters:
        `root` - OGNL expression of root object to be serialized

    - #### setJSONPopulator

          public void setJSONPopulator(JSONPopulator populator)

      Sets the JSONPopulator to be used
      Parameters:
        `populator` - JSONPopulator

    - #### setJSONCleaner

          public void setJSONCleaner(JSONCleaner dataCleaner)

      Sets the JSONCleaner to be used
      Parameters:
        `dataCleaner` - JSONCleaner

    - #### getDebug

          public boolean getDebug()

      Returns:
        true if debugging is turned on

    - #### setDebug

          public void setDebug(boolean debug)

      Turns debugging on or off
      Parameters:
        `debug` - true or false

    - #### setDevMode

          public void setDevMode(String mode)

    - #### setExcludeProperties

          public void setExcludeProperties(String commaDelim)

      Sets a comma-delimited list of regular expressions to match properties that should be excluded from the JSON output.
      Parameters:
        `commaDelim` - A comma-delimited list of regular expressions

    - #### setExcludeWildcards

          public void setExcludeWildcards(String commaDelim)

      Sets a comma-delimited list of wildcard expressions to match properties that should be excluded from the JSON output.
      Parameters:
        `commaDelim` - A comma-delimited list of wildcard expressions

    - #### setIncludeProperties

          public void setIncludeProperties(String commaDelim)

      Sets a comma-delimited list of regular expressions to match properties that should be included from the JSON output.
      Parameters:
        `commaDelim` - A comma-delimited list of regular expressions

    - #### setIncludeWildcards

          public void setIncludeWildcards(String commaDelim)

      Sets a comma-delimited list of wildcard expressions to match properties that should be included from the JSON output. The standard boilerplate (id, error, debug) are automatically included, as appropriate, so you only need to provide patterns for the contents of "result".
      Parameters:
        `commaDelim` - A comma-delimited list of wildcard expressions

    - #### getIncludeProperties

          protected List getIncludeProperties()

      Returns:
        the appropriate set of includes, based on debug setting. Derived classes can override if there are additional, custom debug-only parameters.

    - #### isEnableGZIP

          public boolean isEnableGZIP()

    - #### setEnableGZIP

          public void setEnableGZIP(boolean enableGZIP)

      Setting this property to "true" will compress the output.
      Parameters:
        `enableGZIP` - Enable compressed output

    - #### isNoCache

          public boolean isNoCache()

    - #### setNoCache

          public void setNoCache(boolean noCache)

      Add headers to response to prevent the browser from caching the response
      Parameters:
        `noCache` - no cache

    - #### isExcludeNullProperties

          public boolean isExcludeNullProperties()

    - #### setExcludeNullProperties

          public void setExcludeNullProperties(boolean excludeNullProperties)

      Parameters:
        `excludeNullProperties` - Do not serialize properties with a null value

    - #### setCallbackParameter

          public void setCallbackParameter(String callbackParameter)

    - #### getCallbackParameter

          public String getCallbackParameter()

    - #### setPrefix

          public void setPrefix(boolean prefix)

      Parameters:
        `prefix` - Add "{} && " to generated JSON

    - #### setJsonContentType

          public void setJsonContentType(String jsonContentType)

    - #### setJsonRpcContentType

          public void setJsonRpcContentType(String jsonRpcContentType)

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