parameterwrapper.java

parameter encoding filter

package filter;

import java.io.UnsupportedEncodingException;


import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletRequestWrapper;


public class ParameterWrapper extends HttpServletRequestWrapper {

private boolean isGET; 
	
	private boolean encoding;
	
	public ParameterWrapper(HttpServletRequest request) {
		super(request);
		isGET = getMethod().equals("GET");
		
		if ( request instanceof ParameterWrapper ) {
			encoding = false;
		} else {
			encoding = true;
		}
	}
	
	public String getParameter(String name) {
		String value = super.getParameter(name);
		
		if ( !encoding ) return value;
		
		if ( value == null ) return value;

		if ( isGET ) {
			try {
				return new String(value.getBytes("8859_1"), "UTF-8");
			} catch (UnsupportedEncodingException e) {
			}
		} else {
			try {
				return new String(value.getBytes("8859_1"), "UTF-8");
			} catch (UnsupportedEncodingException e) {
			}
		}
		
		return value;
	}
	
	public String[] getParameterValues(String name) {
		String[] values = super.getParameterValues(name);
		
		if ( !encoding ) return values;
		
		if ( values == null ) return values;
		String[] tempStrs = new String[values.length];
		if ( isGET ) {
			for(int i=0; i<values.length; i++) {
				if ( values[i] != null ) {
					try {
						tempStrs[i] = new String(values[i].getBytes("8859_1"), "UTF-8");
					} catch (UnsupportedEncodingException e) {
					}
				} else {
					tempStrs[i] = null;
				}
			}
			
		} else {
			for(int i=0; i<values.length; i++) {
				if ( values[i] != null ) {
					try {
						tempStrs[i] = new String(values[i].getBytes("8859_1"), "UTF-8");
					} catch (UnsupportedEncodingException e) {
					}
				} else {
					tempStrs[i] = null;
				}
			}
		}
		return tempStrs;	
	}
	
	public String getOrgParameter(String name) {
		return super.getParameter(name);
	}	
	
	
	public String[] getOrgParameterValues(String name) {
		return super.getParameterValues(name);
	}
	
	
 }