尝试在jQuery + Struts2中执行ajax getJson或post操作时，Tomcat7上出现500个内部服务器错误

本文介绍了尝试在jQuery + Struts2中执行ajax getJson或post操作时，Tomcat7上出现500个内部服务器错误的处理方法，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

[已解决]操作名称竟然区分大小写

[SOLVED] Name of action turned out to be case sensitive

我想向服务器发出ajax请求以获取JSON.我正在使用以这种方式配置的struts2软件包

I want to do an ajax request to server in order to get a JSON. I am using struts2 package configured in this way

<package name="it.polito.ai.e3" namespace=""
    extends="struts-default,json-default">
    <action name="getDay" class="it.polito.ai.e3.GetDayAction" >
        <result name="success" type="json" />
        <result name="error" type="json" />
    </action>
</package>

GetDayAction类是

GetDayAction class is

package it.polito.ai.e3;

import java.util.Date;

import com.opensymphony.xwork2.Action;
import com.opensymphony.xwork2.ActionContext;
import com.opensymphony.xwork2.ActionSupport;

@SuppressWarnings("serial")
public class GetDayAction extends ActionSupport
{
private String startDate;

public String execute()
{
    try
    {
        System.out.println("Ciao");
        System.out.println(startDate);
    }
    catch (Exception e)
    {
        e.printStackTrace();
        return Action.ERROR;
    }

    return Action.SUCCESS;
}

public String getStartDate()
{
    return startDate;
}

public void setStartDate(String startDate)
{
    this.startDate = startDate;
}

}

jQuery帖子块是

jQuery post block is

$(function() {
    $.post('getday.action', document.getElementById('startDate').innerHTML,
        function(data) {

        });  
});

在获取jQuery块的情况下

in case of get jQuery block is

$(function() {
    $.getJSON('getday.action', document.getElementById('startDate').innerHTML,
        function(data) {

        });  
});

document.getElementById('startDate').innerHTML获取以字符串格式设置的日期.

document.getElementById('startDate').innerHTML gets a Date formatted in a string.

Tomcat通过ajax执行get或post时，Tomcat给了我500个内部服务器错误和此堆栈跟踪

When it executes get or post via ajax, Tomcat gives me 500 internal server error and this stacktrace

java.lang.NullPointerException
org.apache.struts2.impl.StrutsActionProxy.getErrorMessage(StrutsActionProxy.java:69)
com.opensymphony.xwork2.DefaultActionProxy.prepare(DefaultActionProxy.java:185)
org.apache.struts2.impl.StrutsActionProxy.prepare(StrutsActionProxy.java:63)
org.apache.struts2.impl.StrutsActionProxyFactory.createActionProxy(StrutsActionProxyFactory.java:39)
com.opensymphony.xwork2.DefaultActionProxyFactory.createActionProxy(DefaultActionProxyFactory.java:58)
org.apache.struts2.dispatcher.Dispatcher.serviceAction(Dispatcher.java:500)
org.apache.struts2.dispatcher.FilterDispatcher.doFilter(FilterDispatcher.java:434)

Tomcat7控制台不显示任何内容，System.out.println()或其他消息均不显示.

Tomcat7 console doesn't show up anything, neither System.out.println() nor other messages.

我不知道自己在做什么错.谢谢

I have no clue about what I am doing wrong.Thanks

推荐答案

$.post()/$.getJSON()函数的data参数必须是一个对象或URL参数字符串.您不能只将其传递一个值并期望它知道如何处理它.因此，要么:

The data parameter of the $.post()/$.getJSON() functions either has to be an object, or a URL parameter string; you can't just pass it a single value and expect it to know what to do with it. So, either:

$.getJSON('getday.action', { yourparam : document.getElementById('startDate').innerHTML},
    function(data) {

    });

或

$.getJSON('getday.action', 'yourparam=' + document.getElementById('startDate').innerHTML},
    function(data) {

    });

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