Java WEB 应用字符编码解决方案

过滤器类:
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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;

/**
* 此过滤器用于设置字符编码
*
* @author 小强
*
*/
public class SetCharacterEncodingFilter implements Filter {

protected String encoding = null;

protected FilterConfig filterConfig = null;

public SetCharacterEncodingFilter() {
super();
}

/*
*
*
* @see javax.servlet.Filter#init(javax.servlet.FilterConfig)
*/
public void init(FilterConfig filterConfig) throws ServletException {

this.filterConfig = filterConfig;
this.encoding = filterConfig.getInitParameter("encoding");
}

/*
*
*
* @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 {
// Select and set (if needed) the character encoding to be used
String encoding = selectEncoding(request);
if (encoding != null) {
// 设置请求的字符编码
request.setCharacterEncoding(encoding);
// 设置响应的字符编码
response.setCharacterEncoding(encoding);
}
// Pass control on to the next filter
chain.doFilter(request, response);
}

/*
*
*
* @see javax.servlet.Filter#destroy()
*/
public void destroy() {
this.encoding = null;
this.filterConfig = null;
}

protected String selectEncoding(ServletRequest request) {
return (this.encoding);
}
}
web.xml映射
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<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns="http://java.sun.com/xml/ns/j2ee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" version="2.4" xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd"> <filter>
<filter-name>Set Character Encoding</filter-name>
<filter-class>com.dadaonline.commons.filter.SetCharacterEncodingFilter</filter-class>
<init-param>
<param-name>encoding</param-name>
<param-value>UTF-8</param-value>
</init-param>
</filter>
<filter-mapping>
<filter-name>Set Character Encoding</filter-name>
<servlet-name>strutsAction</servlet-name>
</filter-mapping>
<servlet>
<servlet-name>strutsAction</servlet-name>
<servlet-class>org.apache.struts.action.ActionServlet</servlet-class>
<init-param>
<param-name>config</param-name>
<param-value>/WEB-INF/struts-config.xml</param-value>
</init-param>
<init-param>
<param-name>debug</param-name>
<param-value>3</param-value>
</init-param>
<init-param>
<param-name>detail</param-name>
<param-value>3</param-value>
</init-param>
<load-on-startup>0</load-on-startup>
</servlet>
<servlet-mapping>
<servlet-name>strutsAction</servlet-name>
<url-pattern>*.do</url-pattern>
</servlet-mapping>
</web-app>