java web中的過濾器
懸賞分：20|
如果要自定義一個過濾器，要實現(xiàn)接口Filter 其中有個方法是doFilter(..)
一個請求發(fā)送到服務(wù)器然后服務(wù)器響應(yīng)回來 ，是否2次經(jīng)過過濾器的該方法？
一個請求發(fā)送到服務(wù)器然后服務(wù)器響應(yīng)回來 ，是否2次經(jīng)過過濾器的該方法？
過濾器執(zhí)行的順序是
//1.過濾器代碼
.....
//2.讓請求繼續(xù)執(zhí)行
filterChain.doFilter(request,response)//這句代碼的意思是讓請求往下繼續(xù)執(zhí)行
//3.執(zhí)行完后，繼續(xù)執(zhí)行過濾器代碼
....
//響應(yīng)客戶
//1.過濾器代碼
.....
//2.讓請求繼續(xù)執(zhí)行
filterChain.doFilter(request,response)//這句代碼的意思是讓請求往下繼續(xù)執(zhí)行
//3.執(zhí)行完后，繼續(xù)執(zhí)行過濾器代碼
....
//響應(yīng)客戶
好
不好其 他 回 答共2條
1樓
public class EncodingFilter implements Filter {
private FilterConfig config;
private String targetEncoding;
public void init(FilterConfig config) {
this.config = config;
this.targetEncoding = this.config.getInitParameter("encoding");
}
public void doFilter(ServletRequest srequest, ServletResponse sresponse,
FilterChain chain) throws IOException, ServletException {
System.out.println("encoding=" + this.targetEncoding);
HttpServletRequest request = (HttpServletRequest) srequest;
request.setCharacterEncoding(this.targetEncoding);
chain.doFilter(srequest, sresponse);
}
public void setFilterConfig(final FilterConfig filterConfig) {
}
public void destroy() {
config = null;
}
private FilterConfig config;
private String targetEncoding;
public void init(FilterConfig config) {
this.config = config;
this.targetEncoding = this.config.getInitParameter("encoding");
}
public void doFilter(ServletRequest srequest, ServletResponse sresponse,
FilterChain chain) throws IOException, ServletException {
System.out.println("encoding=" + this.targetEncoding);
HttpServletRequest request = (HttpServletRequest) srequest;
request.setCharacterEncoding(this.targetEncoding);
chain.doFilter(srequest, sresponse);
}
public void setFilterConfig(final FilterConfig filterConfig) {
}
public void destroy() {
config = null;
}
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