request.getParameter("")的返回值问题
2013-11-02 10:29
489 查看
String info = request.getParameter("info");
if(info == null){
System.out.println("yao hehe");
}else if(info.equals("error")){
out.println("<center><h1>用户名或密码错误</h1></center>");
}看得出来如果没有得到相应的值，info返回的是null值并不是“”
内容来自用户分享和网络整理，不保证内容的准确性，如有侵权内容，可联系管理员处理 
相关文章推荐
- struts中post方式上传文件，enctype="multipart/form-data"，request.getParameter("file") 是null的问题分析
- struts中enctype="multipart/form-data"，request.getParameter("file") 是null的问题分
- FORM的ENCTYPE="multipart/form-data" 时request.getParameter()值为null问题的解决
- FORM的ENCTYPE="multipart/form-data" 时request.getParameter()值为null问题的解决
- 问题解决： Attribute value request.getParameter("id") is quoted with " which must be escaped when used within the value
- Post大文本的情况下，request.getParameter("fieldName") returns NULL的问题
- FORM的ENCTYPE="multipart/form-data" 时request.getParameter()值为null问题的解决
- String baseprice = request.getParameter("baseprice")==null相关问题
- 解决var url="xxx&参数名="+“中文参数”; 传到后台根据String x = request.getParameter("中文参数名");乱码问题
- 问题解决： Attribute value request.getParameter("id") is quoted with " which must be escaped when used wi
- 关于在Java中使用request.getRequestDispatcher(".....")引起的css文件无效或图片无效问题。
- Attribute value request.getParameter("param") 问题
- request.getRequestDispatcher("").forward()中文乱码问题
- request.getParameter("")的乱码问题
- Jsp中request.getParameter("@param")值为[object HTMLInputElement]
- Attribute value request.getParameter("digyso") is quoted with " which must be escaped when used within the value
- 当FORM的ENCTYPE=&quot;multipart/form-data&quot; 时request.getParameter()获取不到
- Attribute value request.getParameter("name") is quoted with " which must be escaped when used
- Stupid error work with actionRequest.getParameter("something")
- SpringMVC中使用Ajax POST请求以json格式传递参数服务端通过request.getParameter("name")无法获取参数值问题分析