Web.xm l構成詳細のFilter
1、xml構成
2、javaコード
<filter>
<filter-name>encodingfilter</filter-name>
<filter-class>com.my.app.EncodingFilter</filter-class>
<init-param>
<param-name>encoding</param-name>
<param-value>UTF-8</param-value>
</init-param>
</filter>
<filter-mapping>
<filter-name>encodingfilter</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>
2、javaコード
/**
*
*/
package com.myapp;
import java.io.IOException;
import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
/**
* @author louisliao
*
*/
public class EncodingFilter implements Filter {
/**
*
*/
protected String encoding = null;
protected FilterConfig filterConfig;
/**
*
*/
protected boolean ignore = true;
/**
*
*/
public EncodingFilter() {
// TODO Auto-generated constructor stub
}
/**
* (non-Javadoc)
* @see javax.servlet.Filter#destroy()
*/
public void destroy() {
// TODO Auto-generated method stub
this.encoding=null;
this.filterConfig=null;
}
/**
*(non-Javadoc)
* @see javax.servlet.Filter#doFilter(javax.servlet.ServletRequest, javax.servlet *.ServletResponse, javax.servlet.FilterChain)
*/
public void doFilter(ServletRequest request, ServletResponse response,
FilterChain chain) throws IOException, ServletException {
// TODO Auto-generated method stub
HttpServletRequest hRequest=(HttpServletRequest)request;
HttpServletResponse hResponse=(HttpServletResponse)response;
//Conditionally select and set the character encoding to be used
if(ignore || hRequest.getCharacterEncoding()==null){
String coding=selectEncoding(hRequest);
if(coding!=null){
hRequest.setCharacterEncoding(coding);
hResponse.setCharacterEncoding(coding);
}
}
// filter
chain.doFilter(hRequest, hResponse);
}
/**
* (non-Javadoc)
* @see javax.servlet.Filter#init(javax.servlet.FilterConfig)
*/
public void init(FilterConfig filterConfig) throws ServletException {
// TODO Auto-generated method stub
this.filterConfig=filterConfig;
this.encoding=filterConfig.getInitParameter("encoding");
System.out.println(this.encoding);
String value = filterConfig.getInitParameter("ignore");
if (value == null) {
this.ignore = true;
} else if (value.equalsIgnoreCase("true")) {
this.ignore = true;
} else if (value.equalsIgnoreCase("yes")) {
this.ignore = true;
} else {
this.ignore = false;
}
}
protected String selectEncoding(ServletRequest request) {
return (this.encoding);
}
}
//init WEB ,doFilter filter-mapping url 。