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Struts 2 - 意外异常捕获设置'xx'

Java问题
2022-01-01

Struts 2 - Unexpected Exception caught setting #39;xx#39;(Struts 2 - 意外异常捕获设置xx)

本文介绍了Struts 2 - 意外异常捕获设置'xx'的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！

问题描述

我正在尝试将未知数字输入从 HTML Form 提交到 Action 类，并通过 Action 类中的 request Method(Used ServletActionContext) 获取 Input 参数信息.

I am trying to submit unknown number input from HTML Form to Action class and fetch the Input parameter information by using request Method(Used ServletActionContext) in the Action class.

但它的投掷

Unexpected Exception catched setting 'xx' on 'class classname Error setting expression 'xx' with value ['yy', ]

由于表单中的输入元素是使用 JS 动态添加的，所以我无法在 Action 类中使用 getter 和 setter.

Since input elements in the form are adding dynamically using JS, i am not in the position to have getters and setters in the Action class.

如何无异常处理Action类?

How to process the Action class without any exceptions?

JSP:

<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<title>Team Activity Log</title>
<SCRIPT language="javascript">
function addRow(tableid)
{
 var table = document.getElementById(tableid);
  var rowCount = table.rows.length;
   var row = table.insertRow(rowCount);

    var cell1 = row.insertCell(0);
    var element1 = document.createElement("select");
    element1=document.getElementById("sele").cloneNode(true);
    element1.type="select";
    cell1.appendChild(element1);

    var cell2=row.insertCell(1);
    var element2 = document.createElement("input");
    element2.type="text";
    element2.setAttribute("placeholder","E.g:1234");
    cell2.appendChild(element2);

    var cell3=row.insertCell(2);
    var element3 = document.createElement("input");
    element3.type="text";
    element3.setAttribute("placeholder","Brief your work");
    cell3.appendChild(element3);

    var cell4=row.insertCell(3);
    var element4 = document.createElement("input");
    element4.type="text";
        element4.setAttribute("placeholder","MM min");
    cell4.appendChild(element4);


    var cell5=row.insertCell(4);
    var element5 = document.createElement("img");
    element5.src="close.png";
        element5.setAttribute("id","delete");
        element5.setAttribute("onclick","changeImage(this)");
    cell5.appendChild(element5);



    }
function changeImage(temp)
{
(temp.parentElement).parentElement.remove();
}
function convert(tableid,temp2)
{
var table=document.getElementById(tableid);
console.log(table.rows.length);
var hidelement=document.getElementById(temp2);
hidelement.setAttribute("value",table.rows.length-1);
for(var i=1;i<table.rows.length;i++)
{
var tt="tt"+i;
var rf="rf"+i;
var des="des"+i;
var eff="eff"+i;
console.log("executing function");
var elemen=table.rows[i].cells[0].querySelector("*");
elemen.setAttribute("name",tt);
elemen=table.rows[i].cells[1].querySelector("*");
elemen.setAttribute("name",rf);
elemen=table.rows[i].cells[2].querySelector("*");
elemen.setAttribute("name",des);
elemen=table.rows[i].cells[3].querySelector("*");
elemen.setAttribute("name",eff);
}
}
</script>
</head>
<body>
    <INPUT type="button" value="Add Row" onclick="addRow('matrix')" />
    <%@ taglib uri="/struts-tags" prefix="s" %>
    <s:url id="myActionUrl" action="timesheetprocess" />
    <form action=<s:property value="%{myActionUrl}" />> 
    <input type="hidden" id="taskcount" value="5">
<table id="matrix">
<tr>
    <th>Task Type</th>
    <th>Reference ID</th>
    <th>Description</th>
    <th>Efforts</th>
    <th></th>
  </tr>
  <tr>
  <td>
  <select id="sele">
  <option value="" disabled selected>Select your option</option>
           <option value="SR">SR</option>
           <option value="CR">CR</option>
           <option value="ALM">ALM</option>
           <option value="INCIDENT">INCIDENT</option> 
           <option value="OTHER">OTHER</option>
   </select></TD>
   <td>
   <INPUT type="text" placeholder="E.g:1234"/>
   </td>
   <td>
   <INPUT type="text" placeholder="Brief your work"/>
   </td>
   <td>
   <INPUT type="text" placeholder="MM min" />
   </td>
   <td>
   <img id="delete" src="close.png" onclick="changeImage(this)">
   </td>
   </tr><tr>
  <td>
  <select id="sele">
  <option value="" disabled selected>Select your option</option>
           <option value="SR">SR</option>
           <option value="CR">CR</option>
           <option value="ALM">ALM</option>
           <option value="INCIDENT">INCIDENT</option> 
           <option value="OTHER">OTHER</option>
   </select></TD>
   <td>
   <INPUT type="text" placeholder="E.g:1234"/>
   </td>
   <td>
   <INPUT type="text" placeholder="Brief your work"/>
   </td>
   <td>
   <INPUT type="text" placeholder="MM min" />
   </td>
   <td>
   <img id="delete" src="close.png" onclick="changeImage(this)">
   </td>
   </tr>
   <tr>
  <td>
  <select id="sele">
  <option value="" disabled selected>Select your option</option>
           <option value="SR">SR</option>
           <option value="CR">CR</option>
           <option value="ALM">ALM</option>
           <option value="INCIDENT">INCIDENT</option> 
           <option value="OTHER">OTHER</option>
   </select></TD>
   <td>
   <INPUT type="text" placeholder="E.g:1234"/>
   </td>
   <td>
   <INPUT type="text" placeholder="Brief your work"/>
   </td>
   <td>
   <INPUT type="text" placeholder="MM min" />
   </td>
   <td>
   <img id="delete" src="close.png" onclick="changeImage(this)">
   </td>
   </tr>
   <tr>
  <td>
  <select id="sele">
  <option value="" disabled selected>Select your option</option>
           <option value="SR">SR</option>
           <option value="CR">CR</option>
           <option value="ALM">ALM</option>
           <option value="INCIDENT">INCIDENT</option> 
           <option value="OTHER">OTHER</option>
   </select></TD>
   <td>
   <INPUT type="text" placeholder="E.g:1234"/>
   </td>
   <td>
   <INPUT type="text" placeholder="Brief your work"/>
   </td>
   <td>
   <INPUT type="text" placeholder="MM min" />
   </td>
   <td>
   <img id="delete" src="close.png" onclick="changeImage(this)">
   </td>
   </tr>
   <tr>
  <td>
  <select id="sele">
  <option value="" disabled selected>Select your option</option>
           <option value="SR">SR</option>
           <option value="CR">CR</option>
           <option value="ALM">ALM</option>
           <option value="INCIDENT">INCIDENT</option> 
           <option value="OTHER">OTHER</option>
   </select></TD>
   <td>
   <INPUT type="text" placeholder="E.g:1234"/>
   </td>
   <td>
   <INPUT type="text" placeholder="Brief your work"/>
   </td>
   <td>
   <INPUT type="text" placeholder="MM min" />
   </td>
   <td>
   <img id="delete" src="close.png" onclick="changeImage(this)">
   </td>
   </tr>
   </table>
    <INPUT type="button" value="Submit" onclick="convert('matrix','taskcount')" />
 </form> 
   </body>
   </html>

struts.xml 中的动作标签

Action tag in struts.xml

<action name="timesheetprocess" class="com.App.Controller.Timesheet.Timeprocess"
    method="execute">
    <result name="success">Time.jsp</result>
</action>

我的动作类:

import javax.servlet.http.HttpServletRequest;
import org.apache.struts2.ServletActionContext;

public class Timeprocess {
    public String execute() {

        HttpServletRequest request = ServletActionContext.getRequest();
        String tt="tt";
        String rf="rf";
        String des="des";
        String eff="eff";

        for(int i=0;i<Integer.parseInt(request.getParameter("taskcount"));i++)
        {
            System.out.println("Task Type :"+ request.getParameter(tt+String.valueOf(i)));
            System.out.println("Task Type :"+ request.getParameter(rf+String.valueOf(i)));
            System.out.println("Task Type :"+ request.getParameter(des+String.valueOf(i)));
            System.out.println("Task Type :"+ request.getParameter(eff+String.valueOf(i)));


        }
        return "success";

}
}

推荐答案

您可以通过在action config中覆盖拦截器来控制Struts2填充参数的过程.

You can control the process of parameters population by Struts2 via overriding interceptors in the action config. 

<action name="timesheetprocess" class="com.App.Controller.Timesheet.Timeprocess"
            method="execute">
   <interceptor-ref name="defaultStack">
      <param name="params.excludeParams">.*</param>
   </interceptor-ref>
   <result name="success">Time.jsp</result>
</action>

您可以在此处修改 params 拦截器的 excludeParams 属性，以从通过 OGNL 的处理中排除所有参数.

There you modify the excludeParams property of the params interceptor to exclude all parameters from processing via OGNL.

您应该不会以这种方式得到任何异常，但请确保您已配置 struts.devMode=false

You should not get any exception in this way, but make sure you have configured struts.devMode=false

<constant name="struts.devMode" value="false" />

它应该从输出中删除不必要的警告.如果您仍然在日志中收到任何警告或异常，那么您应该配置您的日志框架以从输出中抑制这些警告或错误.

It should remove unnecessary warnings from the output. If you still get any warnings or exceptions in the log, then you should configure your logging framework to suppress those warnings or errors from the output.

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