getattributerequest.getParameter()和request.getAttribute()的区别是什么？

安卓getattributevalue是什么意思

import java.io.InputStream; import java.util.ArrayList; import java.util.List; .xmlpull.v1.XmlPullParser; import android.content.Context; import android.util.Log; import android.util.Xml; class Formation { int id;//为了简单，不写get，set方法 Type type; } class Type { int id; String name; } public class XMLPaser { static final String TAG = "XMLPaser"; private static final String ns = null; private Context context; public XMLPaser(Context context) { this.context = context; } public List parse(String xmlPath) { List forList = new ArrayList(); Formation formation = null; InputStream stream = null; XmlPullParser xmlParse = Xml.newPullParser(); try { stream = this.context.getResources().getAssets().open(xmlPath);//xml文件放在Assert目录 xmlParse.setInput(stream, "utf-8"); int evnType = xmlParse.getEventType();//事件驱动 while (evnType != XmlPullParser.END_DOCUMENT) {//文档结束 switch (evnType) { case XmlPullParser.START_TAG:/启动标签 String tag = xmlParse.getName(); if (tag.equalsIgnoreCase("formation")) {//找到formation formation = new Formation(); formation.id = Integer.parseInt(xmlParse .getAttributeValue(ns, "id"));//得到id属性 } else if (formation != null) {//进入formation里面 if (tag.equalsIgnoreCase("type")) {//找到type formation.type = new Type(); formation.type.id = Integer.parseInt(xmlParse .getAttributeValue(ns, "id")); } if (formation.type != null) {//进到type里面 if (tag.equalsIgnoreCase("name")) {//得到name值 formation.type.name = xmlParse.nextText(); } } } break; case XmlPullParser.END_TAG: if (xmlParse.getName().equalsIgnoreCase("formation") && formation != null) { forList.add(formation); formation = null; } break; default://第一次 break; } evnType = xmlParse.next(); } } catch (Exception e) { Log.d(TAG, e.toString()); } return forList; } }

request.getParameter和request.getAttribute之间的区别

1. request.getParameter()取得是通过容器的实现来取得通过类似post,get等方式传入的数据,request.setAttribute()和getAttribute()只是在web容器内部流转,仅仅是请求处理阶段 2. getAttribute是返回对象,getParameter返回字符串

request.getParameter()和request.getAttribute()的区别是什么？

request.getParameter 是用来接受来自get方法或post方法的参数 <form method=post> <form method=get> <a href="1.jsp?id=1">ok</a> 只能接受java.lang.String 也就是说String hotel_id = request.getParameter("hotel_id"); request.getAttribute 是用来接受来自servlet的变量或Action(其实Action就是特殊的Servlet) 在Action中，request.setAttribute("ret",ret); 只能接受java.lang.Object 也就是说List ret = (List)request.getAttribute("ret"); 一个是变量类型，一个对象类型