html超链接请求后台,javascript,java_一个页面的超链接向后台发请求的问题？，javascript,java,html

本文介绍了一个关于无线点餐平台中餐桌状态更新时遇到的问题，包括前端点击操作发送请求及后端处理请求的具体实现方式，并详细分析了在添加数据后进行操作时出现的错误原因。

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一个页面的超链接向后台发请求的问题？

先来前jsp页面的代码

String path = request.getContextPath();

String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";

无线点餐平台

$(function(){

$("#isorder").click(function(){

var val = this.innerHTML;

if(val=="预定") {

var url = this.href + "&tableStatus=1";

alert(url);

$.post(url, function(data){

$("#orderStatus").html("预定");

$("#orderDate").html(data);

$("#isorder").text('退订');

});

} else {

var url = this.href + "&tableStatus=2";

alert(url);

$.post(url, function() {

$("#orderStatus").html("空闲");

$("#orderDate").html("");

$("#isorder").text('预定');

});

}

return false;

});

})

餐桌列表

编号桌名状态预定时间操作

${table.id } ${table.tableName } ${table.tableStatus == 1 ? "预定":"空闲" }

${table.tableStatus == 1 ? "退订":"预定" }

删除

没有餐桌信息！请添加后查询。。。。

添加

再来后台处理

public Object updateDinnerTable(HttpServletRequest request, HttpServletResponse response) {

Object url = null;

String id = request.getParameter("id");

String tableStatus = request.getParameter("tableStatus");

System.out.println(tableStatus);

//构建对象

DinnerTable dinnerTable = new DinnerTable();

dinnerTable.setId(Integer.parseInt(id));

dinnerTable.setTableStatus(Integer.parseInt(tableStatus));

Date orderDate = (Integer.parseInt(tableStatus) == 2) ? null:new Date();

dinnerTable.setOrderDate(orderDate);

dinnerTableService.update(dinnerTable);

SimpleDateFormat df = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");

String date = df.format(orderDate);

try {

PrintWriter writer = response.getWriter();

writer.write(date);

} catch (IOException e) {

e.printStackTrace();

}

System.out.println("id:" +id + "; tableStatus:" + tableStatus);

return url;

}

来运行结果

然后添加一条数据再对新添加的数据进行操作就报错了

null

java.lang.reflect.InvocationTargetException

at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)

at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)

at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)

at java.lang.reflect.Method.invoke(Method.java:498)

at com.uiyllong.servlet.BaseServlet.service(BaseServlet.java:36)

at javax.servlet.http.HttpServlet.service(HttpServlet.java:729)

at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:292)

at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:207)

at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)

at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:240)

at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:207)

at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:212)

at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:106)

at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:502)

at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:141)

at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:79)

at org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:616)

at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:88)

at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:528)

at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1099)

at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:670)

at org.apache.tomcat.util.net.AprEndpoint$SocketProcessor.doRun(AprEndpoint.java:2508)

at org.apache.tomcat.util.net.AprEndpoint$SocketProcessor.run(AprEndpoint.java:2497)

at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)

at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)

at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)

at java.lang.Thread.run(Thread.java:745)

Caused by: java.lang.NumberFormatException: null

at java.lang.Integer.parseInt(Integer.java:542)

at java.lang.Integer.parseInt(Integer.java:615)

at com.uiyllong.servlet.DinnerTableServlet.updateDinnerTable(DinnerTableServlet.java:77)

... 27 more

请大神看看哪里有问题

html超链接请求后台,javascript,java_一个页面的超链接向后台发请求的问题？，javascript,java,html - phpStudy...