解决问题：java.lang.NumberFormatException: For input string: ""
最近写的一个项目，须要日后台传值，参数有多是是空值，前端定义的，前端 var String = '';
$("").onclick(function(){
>>>>>>> //赋值区域省略
})
location.href = "${pageContext.request.contextPath}/admin?str="+String; 如上代码，中间赋值过程就不写了
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