CharacterEncodingFilter过滤器处理乱码

墨蓝 2022-06-16 11:54 235阅读 0赞

package cn.jbit.houserent.filter;  
import java.io.IOException;  
import java.io.UnsupportedEncodingException;  
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;  
import javax.servlet.http.HttpServletResponse;

public class CharacterEncodingFilter implements Filter\{  
  
private String encoding = null;  
@SuppressWarnings("unused")  
private FilterConfig fg = null;  
  
public void destroy() \{  
this.encoding = null;  
this.fg = null;

public void doFilter(ServletRequest req, ServletResponse res,  
FilterChain fc) throws IOException, ServletException \{  
HttpServletResponse response = (HttpServletResponse)res;  
response.setContentType("text/html;charset="+this.encoding);  
HttpServletRequest request = (HttpServletRequest)req;  
HttpRequestWrapper hrw = new HttpRequestWrapper(request);  
fc.doFilter(hrw, res);  
/\*if("POST".equalsIgnoreCase(request.getMethod()))  
request.setCharacterEncoding(encoding);  
else  
request = new HttpRequestWrapper(request);  
fc.doFilter(request, res);\*/  
\}

public void init(FilterConfig fg) throws ServletException \{  
this.fg = fg;  
this.encoding = fg.getInitParameter("encoding");  
if(this.encoding == null || "".equals(encoding)) this.encoding = "UTF-8";  
\}  
  
public class HttpRequestWrapper extends HttpServletRequestWrapper\{  
public HttpRequestWrapper(HttpServletRequest request)\{  
super(request);  
\}  
public String getParameter(String name)\{  
String value = null;  
value = this.encoding(((HttpServletRequest)this.getRequest()).getParameter(name));  
  
return value;  
\}  
public String\[\] getParameterValues(String name)\{  
String\[\] values = ((HttpServletRequest)this.getRequest()).getParameterValues(name);  
  
if(values != null)\{  
int length = values.length;  
for(int i = 0; i < length; i++)\{  
values\[i\] = this.encoding(values\[i\]);  
\}  
\}  
return values;  
\}  
public String encoding(String value)\{  
if(value != null)\{  
try \{  
value = new String(value.getBytes("ISO-8859-1"),CharacterEncodingFilter.this.encoding);  
\} catch (UnsupportedEncodingException e) \{  
// TODO Auto-generated catch block  
e.printStackTrace();  
\}  
\}  
return value;  
\}  
\}  
\}

web.xml配置  
<filter>  
<filter-name>CharacterEncodingFilter</filter-name>  
<filter-class>  
cn.jbit.houserent.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>