struts中文乱码使用filter
先创建一个filter从Filter继承:
package blog.filter;
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.HttpServletRequestWrapper;
public class CharacterEncodingFilter implements Filter {
private final String OLD_ENCODING = "ISO-8859-1";
private String encoding = "UTF-8";
public void init(FilterConfig filterConfig) throws ServletException {
String s = filterConfig.getInitParameter("encoding");
if (s != null && !"".equals(s)) encoding = s;
}
public void destroy() {
//
}
public void doFilter(ServletRequest request, ServletResponse response,
FilterChain chain) throws IOException, ServletException {
HttpServletRequest httpreq = (HttpServletRequest) request;
if (httpreq.getMethod().equals("POST")) {
request.setCharacterEncoding(encoding);
} else {
request = new RequestEncodingWrapper(httpreq);
}
chain.doFilter(request, response);
}
private class RequestEncodingWrapper extends HttpServletRequestWrapper {
public RequestEncodingWrapper(HttpServletRequest request) {
super(request);
}
public String toChi(String input) {
try {
byte[] bytes = input.getBytes(OLD_ENCODING);
return new String(bytes, encoding);
} catch (Exception ex) {
}
return null;
}
/**
* Return the HttpServletRequest holded by this object.
*/
private HttpServletRequest getHttpServletRequest() {
return (HttpServletRequest) super.getRequest();
}
public String getParameter(String name) {
return toChi(getHttpServletRequest().getParameter(name));
}
public String[] getParameterValues(String name) {
String values[] = getHttpServletRequest().getParameterValues(name);
if (values != null) {
for (int i = 0; i < values.length; i++) {
values[i] = toChi(values[i]);
}
}
return values;
}
}
}
然后在web.xml中配置:
<filter>
<filter-name>CharacterEncodingFilter</filter-name>
<filter-class>blog.filter.CharacterEncodingFilter</filter-class>
<init-param>
<param-name>encoding</param-name>
<param-value>UTF-8</param-value>
</init-param>
</filter>
<filter-mapping>
<filter-name>CharacterEncodingFilter</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>