AJAX无刷新页面和监听器文档格式.docx

AJAX无刷新页面和监听器文档格式.docx

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//后去配置文件中的初始化参数

publicEnumeractiongetInitParameterNames（）;

//用于获取全部的初始化参数

Enumeraction：

列举，不是一种数据结构，是java.util中的一个接口类

接口中定义了一个数据结构得到连续数据的手段

FilterChain

doFilter（）//继续走下一个过滤器或请求资源

过滤器的加载

过滤器要配置web.xml

过滤只能通过登录界面进入主界面

<

?

xmlversion="

1.0"

encoding="

UTF-8"

>

web-appxmlns:

xsi="

http:

//www.w3.org/2001/XMLSchema-instance"

xmlns="

//xmlns.jcp.org/xml/ns/javaee"

xsi:

schemaLocation="

//xmlns.jcp.org/xml/ns/javaeehttp:

//xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd"

id="

WebApp_ID"

version="

3.1"

<

display-name>

day0601<

/display-name>

<

welcome-file-list>

welcome-file>

index.html<

/welcome-file>

index.htm<

index.jsp<

default.html<

default.htm<

default.jsp<

/welcome-file-list>

filter>

filter-name>

myfilter<

/filter-name>

filter-class>

com.chinasofti.eec.filter.MyFilter<

/filter-class>

//路径

init-param>

//初始化参数来获取初始化参数的值

<

param-name>

jdbc<

/param-name>

param-value>

jdbc:

mysql:

//localhost:

3306/database<

/param-value>

/init-param>

jdbc1111<

3306/database1111<

/filter>

filter-mapping>

url-pattern>

/login<

/url-pattern>

!

--配置我们需要过滤的页面-->

/filter-mapping>

/web-app>

MyFilter.java

packagecom.chinasofti.eec.filter;

importjava.io.IOException;

importjava.util.Enumeration;

importjavax.servlet.Filter;

importjavax.servlet.FilterChain;

importjavax.servlet.FilterConfig;

importjavax.servlet.ServletException;

importjavax.servlet.ServletRequest;

importjavax.servlet.ServletResponse;

importjavax.servlet.http.HttpServletRequest;

importjavax.servlet.http.HttpServletResponse;

publicclassMyFilterimplementsFilter{

@Override

publicvoiddestroy（）{

publicvoiddoFilter（ServletRequestarg0,ServletResponsearg1,FilterChainarg2）

throwsIOException,ServletException{

HttpServletRequestreq=（HttpServletRequest）arg0;

//用req对象来替换arg0对象

HttpServletResponseresp=（HttpServletResponse）arg1;

req.setCharacterEncoding（"

utf-8"

）;

resp.setCharacterEncoding（"

resp.setContentType（"

text/html;

charset=utf-8"

//在前面对编码格式进行顾虑

arg2.doFilter（req,resp）;

publicvoidinit（FilterConfigconfig）throwsServletException{

//获得初始化参数System.out.println（config.getInitParameter（"

jdbc"

））;

//输出jdbc:

3306/database

System.out.println（config.getFilterName（））;

//输出myfilter

System.out.println（config.getServletContext（）.getContextPath（））;

//输出/day0602

jdbc

jdbc1111

Enumeration<

String>

e=config.getInitParameterNames（）;

while（e.hasMoreElements（））{

Stringstr=e.nextElement（）;

System.out.println（str）;

}

LoginServlet.java

packagecom.chinasofti.eec.servlet;

importjava.io.PrintWriter;

importjavax.servlet.annotation.WebServlet;

importjavax.servlet.http.HttpServlet;

@WebServlet（"

/login"

）//servlet与数据库连接的路径与form表单中的login跳转对应

publicclassLoginServletextendsHttpServlet{

protectedvoiddoGet（HttpServletRequestreq,HttpServletResponseresp）throwsServletException,IOException{

this.doPost（req,resp）;

protectedvoiddoPost（HttpServletRequestreq,HttpServletResponseresp）throwsServletException,IOException{

Stringname=req.getParameter（"

user"

//从页面获取内容name来装如页面的内容

System.out.println（name）;

PrintWriterout=resp.getWriter（）;

out.print（"

姓名是"

+name）;

Index.jsp

%@pagelanguage="

java"

contentType="

charset=UTF-8"

pageEncoding="

%>

DOCTYPEhtmlPUBLIC"

-//W3C//DTDHTML4.01Transitional//EN"

"

//www.w3.org/TR/html4/loose.dtd"

html>

head>

metahttp-equiv="

Content-Type"

content="

title>

Inserttitlehere<

/title>

/head>

body>

formaction="

login"

method="

post"

//action就是路径

user:

inputtype="

text"

name="

br/>

submit"

>

/form>

/body>

/html>

Web.xml

loginfilter<

com.chinasofti.eec.filter.LoginFilter<

/sec/*<

vipfilter<

com.chinasofti.eec.filter.VipFilter<

/vip/*<

uname"

radio"

name="

value="

2"

普通用户<

1"

VIP用户<

验证码：

imgsrc="

img"

）//servlet中的路径

Stringrole=req.getParameter（"

//让role存储输如到点击时间的value值

if（"

tom"

.equals（name））{

req.getSession（）.setAttribute（"

name）;

//uname是input中的而name则是容器

role"

role）;

resp.sendRedirect（"

sec/sec.jsp"

}else{

index.jsp"

LoginFilter.java

只能通过输入用户名来进入其他界面否则会一致在登录界面

importjavax.servlet.annotation.WebFilter;

publicclassLoginFilterimplementsFilter{

/**

*@seeFilter#doFilter（ServletRequest,ServletResponse,FilterChain）

*/

publicvoiddoFilter（ServletRequestrequest,ServletResponseresponse,FilterChainchain）throwsIOException,ServletException{

HttpServletRequestreq=（HttpServletRequest）request;

//只要上传到服务器上拿和取都要用到req和resp对象

HttpServletResponseresp=（HttpServletResponse）response;

Stringname=（String）req.getSession（）.getAttribute（"

//从session中获取值因为有HttpServletRequest。

过滤器不能直接从页面中拿要从session中拿

if（name==null）{

resp.sendRedirect（req.getContextPath（）+"

/index.jsp"

chain.doFilter（request,response）;

*@seeFilter#init（FilterConfig）

publicvoidinit（FilterConfigfConfig）throwsServletException{

VipFilter.java

不是vip用户不能进入vip界面

publicclassVipFilterimplementsFilter{

//TODOAuto-generatedmethods