通过输出过滤器用out输出一个页面， 怎么是乱码

Question

PrintWriter out=response.getWriter();
......
chain.doFilter(request,wrapper);
....
 String resStr=wrapper.toString();
 resStr=resStr.replaceAll("null", "");    
 System.out.println(resStr);
 out.println(resStr);
后台输出的都是正常的汉字,可生成在页面却都是乱码,好象response应该设置响应头的，忘记了,请教各位

Answer 1

response.setContentType("text/html;charset=gb2312");

Answer 2

response.setContentType("text/html;charset=GBK");
楼主想必是忘了这条了。

Answer 3

PrintWriter out=response.getWriter();
      CharResponseWrapper wrapper=new CharResponseWrapper((HttpServletResponse)response);
       chain.doFilter(request,wrapper);
    //  <%@ page contentType="text/html; charset=GB2312" %>
      
      String resStr=wrapper.toString();
      String newStr="";
   
      newStr=resStr.replaceAll("null", "");  
      
      
   /*   String temp_p = newStr;         byte[] temp_t = temp_p.getBytes("GB2312");
        newStr = new String(temp_t);
        */
      
      
      System.out.println(newStr);    
      response.setContentType("text/html;charset=GB2312"); 
   
      out.println(newStr);
还是乱码

Answer 4

最好是加一个字符转换的过滤类，配置如下web.xml
<filter>
<filter-name>Set Character Encoding</filter-name>
<filter-class>common.util.filter.SetCharacterEncodingFilter</filter-class>
<init-param>
<param-name>encoding</param-name>
<param-value>GBK</param-value>
</init-param>
</filter>
<filter-mapping>
<filter-name>Set Character Encoding</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>

Answer 5

类源码如下：
package common.util.filter;import javax.servlet.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.UnavailableException;public class SetCharacterEncodingFilter implements Filter {
protected String encoding = null; protected FilterConfig filterConfig = null; protected boolean ignore = true; public void destroy() {
this.encoding = null;
this.filterConfig = null;
} public void doFilter(ServletRequest request, ServletResponse response,
FilterChain chain) throws IOException, ServletException { // Conditionally select and set the character encoding to be used
if (ignore || (request.getCharacterEncoding() == null)) {
String encoding = selectEncoding(request);
if (encoding != null)
request.setCharacterEncoding(encoding);
} // Pass control on to the next filter
chain.doFilter(request, response);
} 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 if (value.equalsIgnoreCase("yes"))
this.ignore = true;
else
this.ignore = false; } protected String selectEncoding(ServletRequest request) {
return (this.encoding);
}}

Answer 6

java.lang.IllegalStateException: getWriter() has already been called for this response