When an Action class method completes, it returns a String. The value of the String is used to select a result element. An action mapping will often have a set of results representing different possible outcomes. A standard set of result tokens are defined by the Action interfaceActionSupport base class.
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| java |
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| java |
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| title | Predefined result names |
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String SUCCESS = "success";
String NONE = "none";
String ERROR = "error";
String INPUT = "input";
String LOGIN = "login";
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...
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| title | Setting a default Result Type |
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<result-types>
<result-type name="dispatcher" class="org.apache.strutsstruts2.action2.dispatcher.ServletDispatcherResult"
default="true"/>
</result-types>
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...
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| xml |
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| xml |
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| title | Result element without defaults |
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<result name="success" type="dispatcher">
<param name="location">/thank_youThankYou.jsp</param>
</result>
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| Code Block |
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| xml |
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| xml |
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| title | A Result element using some defaults |
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<result>
<param name="location">/thank_youThankYou.jsp</param>
</result>
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The param tag sets a property on the Result object. The most commonly-set property is location, which usually specifies the path to a web resources. The param attribute is another intelligent default.
| Code Block |
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| xml |
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| xml |
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| title | Result element using more defaults |
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<result>/thank_youThankYou.jsp</result>
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Mixing results with intelligent defaults with other results makes it easier to see the "critical path".
| Code Block |
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| xml |
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| xml |
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| title | Multiple Results |
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<action name="Hello">
<result>/pageshello/Hello/Result.jsp</result>
<result name="error">/pageshello/Hello/Error.jsp</result>
<result name="input">/pages/Hellohello/Input.jsp</result>
</action>
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...
| Code Block |
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| xml |
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| xml |
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| title | Defining global results |
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<global-results>
<result name="error">/pages/Error.jsp</result>
<result name="invalid.token">/pages/Error.jsp</result>
<result name="login" type="redirect-action">Logon!input</result>
</global-results>
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...
