Struts2 Exception Handling Mechanism

Struts2 uses declarative methods to manage Exception Handling, so we do not need to write a lot of try... catch... statement to capture exceptions. The execute method throws all exceptions and submits them to the struts2 framework for processing. the XML file is configured with an abnormal ing mechanism, so that struts2 can process and transfer the corresponding view resources. Exception ing can be divided into global exception ing and local exception ing. It has the same nature as <result.../>. The configuration code is as follows: XML Code <Struts> <Package name = "struts2" extends = "struts-Default"> <! -- Configure global exception ing --> <Global-exception-mappings> <Exception-mapping result = "SQL" exception = "Java. SQL. sqlexception"/> </Global-exception-mappings> <Action name = "login" class = "com. Test. Action. loginaction"> <! -- Configure local exception ing --> <Exception-mapping result = "myexception" exception = "com. Test. Exception. myexception"/> <Result name = "success"> result. jsp </result> <Result name = "SQL"> error. jsp </result> <Result name = "myexception"> error. jsp </result> </Action> </Package> </Struts> <Struts> <Package name = "struts2" extends = "struts-Default"> <! -- Configure global exception ing --> <Global-exception-mappings> <Exception-mapping result = "SQL" exception = "Java. SQL. sqlexception"/> </Global-exception-mappings> <Action name = "login" class = "com. Test. Action. loginaction"> <! -- Configure local exception ing --> <Exception-mapping result = "myexception" exception = "com. Test. Exception. myexception"/> <Result name = "success"> result. jsp </result> <Result name = "SQL"> error. jsp </result> <Result name = "myexception"> error. jsp </result> </Action> </Package> </Struts> To display the exception information on the exception handling page, you can use the <s: property/> label to output the exception information: <S: property value = "exception"/>: Output exception information <S: property value = "exceptionstack"/>: outputs exception stack information.