Servlet字符编码过滤器

来源：互联网发布：php模板引擎有哪些编辑：程序博客网时间：2024/05/18 02:52

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此类是过滤器类

package yuhaibin;

import java.io.IOException;
import java.io.UnsupportedEncodingException;

import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;

public class CharacterEncodingfilter implements Filter{
//字符编码（初始化参数）
protected String encoding=null;
//FilterConfig对象
protected FilterConfig filterConfig=null;
public void init(FilterConfig filterConfig)throws ServletException
{
  //对filterConfig赋值
  this.filterConfig=filterConfig;
  //对初始化参数赋值
  this.encoding=filterConfig.getInitParameter("encoding");

  }
public void doFilter(ServletRequest request,ServletResponse response,FilterChain chain) throws UnsupportedEncodingException
{
  //判断字符编码是否有效
  if(encoding!=null)
  {
   //设置request字符编码
   request.setCharacterEncoding(encoding);
        //设置respongse字符编码
   response.setContentType("text/html;charset="+encoding);
  }
  //传递给下一个过滤器
  try {
   chain.doFilter(request, response);
  } catch (IOException e) {
   // TODO Auto-generated catch block
   e.printStackTrace();
  } catch (ServletException e) {
   // TODO Auto-generated catch block
   e.printStackTrace();
  }

}
public void destroy()
{
  //释放资源
  this.encoding=null;
  this.filterConfig=null;
}
}
此Servlet类是接受请求处理类，相当于一个JSP

package yuhaibin;
import java.io.*;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
public class MyServlet extends HttpServlet{
private static final long serialVersionUID=-28643831554544646L;

public void doPost(HttpServletRequest request,HttpServletResponse response)throws ServletException,IOException
{
PrintWriter out=response.getWriter();
//获取表单参数
String name=request.getParameter("username");
if(name!=null&&!name.isEmpty())
{
  System.out.println(name);
  out.print("你好"+name);
  out.print(",<br>欢迎来到我的主页");
}else
{
  out.print("请输入你的中文名字!");
}
out.print("<br><a href=index.jsp>返回</a>");
out.flush();
out.close();
}
}

这个JSP是输入表单，用于输入中文

<%@ page language="java" import="java.util.*" pageEncoding="GB18030"%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<title>字符编码过滤器</title>
</head>

<body>
<form action="MyServlet" method="post">
<p>
请输入你的中文名字：
<input type="text" name="username"/>
<input type="submit" name="submit" value="提交"/>
</p>
</form>
</body>
</html>

还有一个非常重要的Web.xml配置文件用于CharacterEncodingfilter和MyServlet两个类的配置映射

<?xml version="1.0" encoding="UTF-8"?>
<web-app version="2.5" xmlns="http://java.sun.com/xml/ns/javaee"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://java.sun.com/xml/ns/javaee
http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd">

<filter>
<filter-name>
CharacterEncodingfilter
</filter-name>
<filter-class>
yuhaibin.CharacterEncodingfilter
</filter-class>

<init-param>
<param-name>
encoding
</param-name>
<param-value>
GBK
</param-value>
</init-param>
</filter>

<filter-mapping>
<filter-name>
CharacterEncodingfilter
</filter-name>

<url-pattern>
/*
</url-pattern>

<dispatcher>
REQUEST
</dispatcher>
<dispatcher>
FORWARD
</dispatcher>
</filter-mapping>

<servlet>
<servlet-name>
MyServlet
</servlet-name>
<servlet-class>
yuhaibin.MyServlet
</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>
MyServlet
</servlet-name>
<url-pattern>
/MyServlet
</url-pattern>
</servlet-mapping>
<welcome-file-list>
<welcome-file>
index.jsp
</welcome-file>
</welcome-file-list>
</web-app>

效果图