package action;


import java.sql.SQLException;

import static com.opensymphony.xwork2.Action.ERROR;
import static com.opensymphony.xwork2.Action.SUCCESS;

/**
 * Demo class
 *
 * @author lin
 * @date 2018/11/9
 */
public class TestAction {
    private String name;


    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public String Test(){
        String standardName = "a";
        String name = getName();
        System.out.println(name);
        if( standardName.equals(name)){
//            手動丟擲一個異常
            return SUCCESS;
        }else {
            return ERROR;
        }
    }


    public String execute() throws Exception{
        String sqlException = "sql";
        String standardName = "a";
//        String name = getName();
        System.out.println(getName());
        System.out.println("kkk");
        if(sqlException.equals(getName())){
            throw  new SQLException("sql");
        } else  if ( standardName.equals(name)){
            return SUCCESS;
        }
        return ERROR;
    }
}
 

然後在struts.xml中宣告異常的處理，這裡是返回一個jsp頁面

<?xml version="1.0" encoding="UTF-8"?>

<!DOCTYPE struts PUBLIC
        "-//Apache Software Foundation//DTD Struts Configuration 2.5//EN"
        "http://struts.apache.org/dtds/struts-2.5.dtd">

<struts>
    <constant name="struts.enable.DynamicMethodInvocation" value="true"/>

    <package name="test" extends="struts-default">



        <!--<global-results>-->
            <!--<result name="my">index.jsp</result>-->
        <!--</global-results>-->

        <!--<global-exception-mappings>-->
            <!--<exception-mapping exception="java.sql.SQLException" result="my"/>-->
        <!--</global-exception-mappings>-->

        <action name="*_Support" class="action.TestAction"  method="execute">
            <exception-mapping exception="java.sql.SQLException" result="my"/>
            <result name="my">exception.jsp</result>
            <result name="success">ok!.jsp</result>
            <result name="error">error.jsp</result>
            <allowed-methods>Test</allowed-methods>
        </action>

    </package>
</struts>
 

第二種是全域性變數宣告，其他的都一樣，struts.xml改成下面這樣就可以了

<?xml version="1.0" encoding="UTF-8"?>

<!DOCTYPE struts PUBLIC
        "-//Apache Software Foundation//DTD Struts Configuration 2.5//EN"
        "http://struts.apache.org/dtds/struts-2.5.dtd">

<struts>
    <constant name="struts.enable.DynamicMethodInvocation" value="true"/>

    <package name="test" extends="struts-default">



        <global-results>
            <result name="my">index.jsp</result>
        </global-results>

        <global-exception-mappings>
            <exception-mapping exception="java.sql.SQLException" result="my"/>
        </global-exception-mappings>

        <action name="*_Support" class="action.TestAction"  method="execute">
          
            <result name="success">ok!.jsp</result>
            <result name="error">error.jsp</result>
            <allowed-methods>Test</allowed-methods>
        </action>

    </package>
</struts>
 

還可以在異常處理給到的那個jsp頁面中檢視異常的資訊

    <s:property value="exception.message"/>
<%--檢視異常物件本身--%>
    <s:property value="exceptionStack"/>
<%--檢視異常堆疊資訊--%>