JSP小结-Servlet请求与路径
1.JSP指定输出格式
1.1–html格式
<%@ page contentType="text/html;charset=UTF-8";language="java"%>1.2–Excel格式
<% response.setHeader("Content-disposition","attachment;filename=result.xls");
%>
<%@ page contextType="application/vnd.ms-Excel;charset=UTF-8";language="java"%>1.3–Word格式
<% response.setHeader("Content-disposition","attachment;filename=result.word");
%>
<%@ page contextType="application/vnd.ms-Word;charset=UTF-8";language="java"%>如果需要输出格式为Excel或Word，则应将JSP页面的 JS 和CSS 元素删除掉。
2.JSP与Servlet
Servlet是一个Java类，采用CGI方式逐句输出HTML语句，主要用于业务逻辑层，实现业务逻辑的处理。
JSP将Java代码嵌套在HTML中，简化和方便了网页的设计和修改。是为实现表示层而设计的，主要完成界面的显示逻辑。
3.JSP与Servlet请求与路径
jsp：testPath1.jsp
servlet:TestPath url-pattern:/testPath
testPath1.jsp页面代码
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<%@ page import="java.io.*" %>
//一定要引入包
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Insert title heretitle>
head>
<body>
<%
out.println("request.getRequestURI():"+request.getRequestURI()+"
");
out.println("request.getRequestURL():"+request.getRequestURL()+"
");
String strPathFile = application.getRealPath(request.getRequestURI());
out.print("文件的绝对路径："+strPathFile+"
");
String strDirPath = new File(application.getRealPath(request.getRequestURI())).getParent();
out.println("目录的绝对路径："+strDirPath+"
");
%>
<a href="testPath">testPath Servleta>
body>
html>请求testPath1.jsp浏览器显示
request.getRequestURI():/SSM-2/testPath1.jsp
request.getRequestURL():http://localhost:8088/SSM-2/testPath1.jsp
**application.getRealPath(request.getRequestURI())**
文件的绝对路径：D:\apache-tomcat-7.0.40\webapps\SSM-2\SSM-2\testPath1.jsp
** new File(application.getRealPath(request.getRequestURI())).getParent()**
目录的绝对路径：D:\apache-tomcat-7.0.40\webapps\SSM-2\SSM-2请求 /testPath Servlet
java代码：
package com.web.test3;
import java.io.File;
import java.io.IOException;
import java.io.PrintWriter;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
public class TestPath extends HttpServlet {
/**
* Destruction of the servlet.
*/
public void destroy() {
super.destroy(); // Just puts "destroy" string in log
// Put your code here
}
public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
response.setContentType("text/html");
doPost(request, response);
}
public void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
response.setContentType("text/html");
PrintWriter out = response.getWriter();
System.out.println("request.getLocalAddr()--:"+request.getLocalAddr());
System.out.println("request.getLocalName()--:"+request.getLocalName());
System.out.println("request.getLocalPort()--:"+request.getLocalPort());
System.out.println("request.getLocales()--:"+request.getLocales());
System.out.println("request.getRemoteAddr()--:"+request.getRemoteAddr());
System.out.println("request.getRemoteHost()--:"+request.getRemoteHost());
System.out.println("request.getRemotePort()--:"+request.getRemotePort());
System.out.println("request.getRequestedSessionId()--:"+request.getRequestedSessionId());
System.out.println("request.getRequestURI()--:"+request.getRequestURI());
System.out.println("request.getRequestURL()--:"+request.getRequestURL());
System.out.println("request.getServerName()--:"+request.getServerName());
System.out.println("request.getServerPort()--:"+request.getServerPort());
System.out.println("request.getServletPath()--:"+request.getServletPath());
System.out.println("request.getContextPath()--:"+request.getContextPath());
System.out.println("request.getContentLength()--:"+request.getContentLength());
System.out.println("request.getServletPath()："+request.getServletPath());
out.println("request.getServletPath()："+request.getServletPath()+"
");
System.out.println("request.getSession().getServletContext().getResourcePaths('/')"+request.getSession().getServletContext().getResourcePaths("/"));
System.out.println("request.getSession().getServletContext().getServletContextName()"+request.getSession().getServletContext().getServletContextName());
System.out.println("getServletConfig().getServletName()"+getServletConfig().getServletName());
System.out.println("getServletConfig().getServletContext().getContextPath()"+getServletConfig().getServletContext().getContextPath());
String strPathFileString = request.getSession().getServletContext().getRealPath(request.getRequestURI());
System.out.println("文件的绝对路径："+strPathFileString);
out.println("文件的绝对路径："+strPathFileString+"
");
String strDirPath = new File(request.getSession().getServletContext().getRealPath(request.getRequestURI())).getParent();
System.out.println("目录的绝对路径："+strDirPath);
out.println("目录的绝对路径："+strDirPath+"
");
//获取web项目的全路径
String strFullPath = getServletContext().getRealPath("/");
System.out.println("获取web项目的全路径"+strFullPath);
out.print("获取web项目的全路径---getServletContext().getRealPath('/'):"+strFullPath+"
");
//获取web项目的上下文路径
String strContextPath = request.getContextPath();
System.out.println("获取web项目的上下文路径"+strContextPath);
out.print("获取web项目的上下文路径--request.getContextPath():"+strContextPath+"
");
}
public void init() throws ServletException {
}
}
浏览器显示：
request.getServletPath()：/testPath
***request.getSession().getServletContext().getRealPath(request.getRequestURI())***
文件的绝对路径：D:\apache-tomcat-7.0.40\webapps\SSM-2\SSM-2\testPath
*** new File(request.getSession().getServletContext().getRealPath(request.getRequestURI())).getParent()***
目录的绝对路径：D:\apache-tomcat-7.0.40\webapps\SSM-2\SSM-2
获取web项目的全路径---getServletContext().getRealPath('/'):D:\apache-tomcat-7.0.40\webapps\SSM-2\
获取web项目的上下文路径--request.getContextPath():/SSM-2console控制台输出：
request.getLocalAddr()--:127.0.0.1
request.getLocalName()--:bandicam.com
request.getLocalPort()--:8088
request.getLocales()--:java.util.Collections$2@4519778a
request.getRemoteAddr()--:127.0.0.1
request.getRemoteHost()--:127.0.0.1
request.getRemotePort()--:4829
request.getRequestedSessionId()--:B3FADDA338A2FA3D59BCCC46C7722C56
request.getRequestURI()--:/SSM-2/testPath
request.getRequestURL()--:http://localhost:8088/SSM-2/testPath
request.getServerName()--:localhost
request.getServerPort()--:8088
request.getServletPath()--:/testPath
request.getContextPath()--:/SSM-2
request.getContentLength()--:-1
request.getServletPath()：/testPath
request.getSession().getServletContext().getResourcePaths('/')[/index.jsp, /UI_jsp/, /WEB-INF/, /UI_File/, /testPath1.jsp, /META-INF/]
request.getSession().getServletContext().getServletContextName()：null
getServletConfig().getServletName()：TestPath
getServletConfig().getServletContext().getContextPath()：/SSM-2
文件的绝对路径：D:\apache-tomcat-7.0.40\webapps\SSM-2\SSM-2\testPath
目录的绝对路径：D:\apache-tomcat-7.0.40\webapps\SSM-2\SSM-2
获取web项目的全路径：D:\apache-tomcat-7.0.40\webapps\SSM-2\
获取web项目的上下文路径：/SSM-2