Question

我在Action类中都编写了此代码（用于异常处理的代码相同），并且可以正常工作。然后，我们被要求将代码分为Model类和Action类，并使用ModelDriven。现在，代码可以工作了，但不再处理该异常，它直接进入display.jsp。

SaleBean.java

package sale.compute.model;

import java.io.IOException;

import exception.InvalidTargetException;

public class SaleBean {

//input
private String itemName;
private double SRP; //Sales Retail Price
private double TSP; //Target Sales Price

//computed
private double SPM; //Sales Percent Markup


public void process() throws InvalidTargetException, IOException {
    computeSPM();
    checkSPM();
}

//Computes Sales Percent Markup
public void computeSPM() {
    SPM = Math.round((((TSP-SRP)/SRP) * 100));
}

//Checks if SPM is above 15%
public String checkSPM() throws InvalidTargetException, IOException {
    try {
        computeSPM();

        if(SPM > 15)
        {
            throw new InvalidTargetException();
        }
        else
        {
            return "success";
        }
    }
    catch (InvalidTargetException ite) 
    {
        return "error";
    }
}   


//Getters-setters
public String getItemName() {
    return itemName;
}

public void setItemName(String itemName) {
    this.itemName = itemName;
}

public double getSRP() {
    return SRP;
}

public void setSRP(double sRP) {
    SRP = sRP;
}

public double getTSP() {
    return TSP;
}

public void setTSP(double tSP) {
    TSP = tSP;
}

public double getSPM() {
    return SPM;
}

public void setSPM(double sPM) {
    SPM = sPM;
}
}
//DB methods

InvalidTargetException.java

package exception;

public class InvalidTargetException extends Exception {

public InvalidTargetException() {
    super("invalid SPM");
}
}

ComputeSaleAction.java

package sale.compute.action;

import java.io.IOException;

import com.opensymphony.xwork2.ActionSupport;
import com.opensymphony.xwork2.ModelDriven;

import exception.InvalidTargetException;
import sale.compute.model.*;

public class ComputeSaleAction extends ActionSupport implements ModelDriven<SaleBean>{

private SaleBean saleBeanObj = new SaleBean();

public String execute() throws InvalidTargetException, IOException {
    saleBeanObj.process();
    //saleBean.insertRecord();
    return SUCCESS; 
}

public SaleBean getSaleBeanObj() {
    return saleBeanObj;
}

public void setSaleBeanObj(SaleBean saleBeanObj) {
    this.saleBeanObj = saleBeanObj;
}

@Override
public SaleBean getModel() {
    return saleBeanObj;
}
}

struts.xml

<struts>
<package name="default" extends="struts-default">
    <action name="compute" class="sale.compute.action.ComputeSaleAction">

    <!-- added this acc to codejava.net/how to handle exceptions in Struts2 -->
    <exception-mapping result="error" exception="InvalidTargetException"></exception-mapping>

        <result name="success">/display.jsp</result>
        <result name="error">/error.jsp</result>
    </action>
</package>

error.jsp

<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
pageEncoding="ISO-8859-1"%>

<%@ page isErrorPage="true"%>

<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" 
"http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
    <!-- html code here -->
        <form action = "index.jsp">
            <input type = 'submit' value = "<< GO BACK>>">
</form>

</body>
</html>

Struts2无法看到异常并重定向到错误页面

0 个答案: