中文乱码和HTML过滤器【代码库】

tags: 代码库

#中文乱码#

public class CharacterEncodingFilter implements Filter {

	
	public void doFilter(ServletRequest req, ServletResponse resp,
			FilterChain chain) throws IOException, ServletException {
		
		
		HttpServletRequest request = (HttpServletRequest) req;
		HttpServletResponse response = (HttpServletResponse) resp;
		
		request.setCharacterEncoding("UTF-8");
		response.setCharacterEncoding("UTF-8");
		response.setContentType("text/html;charset=UTF-8");
		
		chain.doFilter(new MyRequest(request), response);
		

	}

	public void init(FilterConfig filterConfig) throws ServletException {
		// TODO Auto-generated method stub

	}
	
	public void destroy() {
		// TODO Auto-generated method stub

	}
}

class MyRequest extends HttpServletRequestWrapper{
	private HttpServletRequest request;
	public MyRequest(HttpServletRequest request) {
		super(request);
		this.request = request;
		
	}
	@Override
	public String getParameter(String name) {
		
		String value = this.request.getParameter(name);
		if(value==null){
			return null;
		}
		if(!this.request.getMethod().equalsIgnoreCase("get")){
			return value;
		}
		try {
			value = new String(value.getBytes("iso8859-1"),"UTF-8");
		} catch (UnsupportedEncodingException e) {
			throw new RuntimeException(e);
		}
		return value;
	}
}

#过滤HTML#

public class HtmlFilter implements Filter {

	
	public void doFilter(ServletRequest req, ServletResponse resp,
			FilterChain chain) throws IOException, ServletException {

		HttpServletRequest request = (HttpServletRequest) req;
		HttpServletResponse response = (HttpServletResponse) resp;
		
		chain.doFilter(new MyRequest2(request), response);
		
	}
	
	public void destroy() {
		// TODO Auto-generated method stub
	}

	public void init(FilterConfig filterConfig) throws ServletException {
		// TODO Auto-generated method stub
	}

}
class MyRequest2 extends HttpServletRequestWrapper{

	private HttpServletRequest request;
	public MyRequest2(HttpServletRequest request) {
		super(request);
		this.request = request;
	}
	@Override
	public String getParameter(String name) {
		
		String value = this.request.getParameter(name);
		if(value==null){
			return null;
		}
		return filter(value);
	}
	
	public String filter(String message) {

        if (message == null)
            return (null);

        char content[] = new char[message.length()];
        message.getChars(0, message.length(), content, 0);
        StringBuffer result = new StringBuffer(content.length + 50);
        for (int i = 0; i < content.length; i++) {
            switch (content[i]) {
            case '<':
                result.append("&lt;");
                break;
            case '>':
                result.append("&gt;");
                break;
            case '&':
                result.append("&amp;");
                break;
            case '"':
                result.append("&quot;");
                break;
            default:
                result.append(content[i]);
            }
        }
        return (result.toString());

    }
	
	
}

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