struts2添加过滤器后乱码

Question

本来页面没有乱码 为什么添加了 过滤器之后就乱码了、
过滤器 有 首先是汉字乱码过滤 然后是 登录过滤  最后是权限过滤  怎么回事  
不适用过滤器  就不会出现乱码 ………………

Answer 1

乱码过滤器protected String encoding = null;
protected FilterConfig filterConfig = null;
protected boolean ignore = true; public void init(FilterConfig filterConfig) throws ServletException {
this.filterConfig = filterConfig;
this.encoding = filterConfig.getInitParameter("encoding");
String value = filterConfig.getInitParameter("ignore");
if (value == null)
this.ignore = true;
else if (value.equalsIgnoreCase("true"))
this.ignore = true;
else
this.ignore = false;
} public void doFilter(ServletRequest request, ServletResponse response,
FilterChain chain) throws IOException, ServletException {
// TODO 自动生成方法存根
if (ignore || (request.getCharacterEncoding() == null)) {
String encoding = selectEncoding(request);
if (encoding != null)
request.setCharacterEncoding(encoding);
}
chain.doFilter(request, response);
}xml配置：
<filter>
<filter-name>Set Character Encoding</filter-name>
<filter-class>team4.motor.action.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>
<url-pattern>/*</url-pattern>
</filter-mapping>

Answer 2

登录过滤器public void doFilter(ServletRequest req, ServletResponse res,
FilterChain chain) throws IOException, ServletException {
HttpServletRequest request = (HttpServletRequest) req;
HttpServletResponse response = (HttpServletResponse) res;
HttpSession session = request.getSession();
PrintWriter out=response.getWriter();
if (session.getAttribute("manager") == null||session.getAttribute("carowner") == null||session.getAttribute("operator") == null) {
out.print("<script language=javascript>alert('请登录');javascript:location='../index.jsp'</script>");
}
chain.doFilter(req, res);
}xml配置：
<filter>
<filter-name>loginFilter</filter-name>
<filter-class>team4.motor.action.LoginFilter</filter-class>
</filter>
<filter-mapping>
<filter-name>loginFilter</filter-name>
<url-pattern>/operator/*</url-pattern>
<url-pattern>/manager/*</url-pattern>
</filter-mapping>

Answer 3

权限过滤
public void doFilter(ServletRequest req, ServletResponse res,
FilterChain chain) throws IOException, ServletException {
// 获取uri地址
HttpServletRequest request = (HttpServletRequest) req;
HttpServletResponse response = (HttpServletResponse) res;
HttpSession session = request.getSession();
String uri = request.getRequestURI();
String ctx = request.getContextPath();
uri = uri.substring(ctx.length());
PrintWriter out = response.getWriter();
if (uri.startsWith("/manager")) {
if (session.getAttribute("manager") == null) {
out.print("<script language=javascript>alert('can not goto');javascript:history.go(-2)</script>");
}
}
if(uri.startsWith("/operator")){
if(session.getAttribute("operator")==null){
out.print("<script language=javascript>alert('can not goto');javascript:history.go(-2)</script>");
}
}
chain.doFilter(req, res);
}xml配置：
<filter>
<filter-name>priorityFilter</filter-name>
<filter-class>team4.motor.action.PriorityFilter</filter-class>
</filter>
<filter-mapping>
<filter-name>priorityFilter</filter-name>
<url-pattern>/manager/*</url-pattern>
<url-pattern>/operator/*</url-pattern>
<url-pattern>/carowner/*</url-pattern>
</filter-mapping>