关于 Tomcat 上的应用中使用 GET 方式提交参数的那些事 - Scripts 学盟

package org.iscripts.common.web;
import java.io.*;
import java.util.*;
import javax.servlet.*;
import javax.servlet.http.*;
/**
* @author 林俊海(ialvin.cn) 广东·普宁·里湖
*/
public class FixedEncodingForURI implements Filter {
public void doFilter(ServletRequest req, ServletResponse response,
FilterChain chain) throws IOException, ServletException {
HttpServletRequest request = (HttpServletRequest)req;
request = new RequestWrapper(request);
chain.doFilter( request, response );
}
public void destroy() { }
public void init(FilterConfig filterConfig) throws ServletException { }
}
class RequestWrapper extends HttpServletRequestWrapper {
private String characterEncoding = null;
private Map<String, String[]> parameterMap = null;
public RequestWrapper(HttpServletRequest request) {
super(request);
this.characterEncoding = request.getCharacterEncoding();
}
@Override
public String getParameter(String name) {
String[] values = this.getParameterValues(name);
if (values.length < 1) return "";
return values[0];
}
@Override
public String[] getParameterValues(String name) {
String[] values = this.getParameterMap().get(name);
return values == null ? new String[0] : values;
}
@Override
public Enumeration<String> getParameterNames() {
return new Enumeration_<String>( this.getParameterMap().keySet().iterator() );
}
@Override
@SuppressWarnings("unchecked")
public Map<String, String[]> getParameterMap() {
if (parameterMap != null) return parameterMap;
parameterMap = new HashMap<String, String[]>();
try {
super.setCharacterEncoding("iso-8859-1");
Map<String, String[]> map = super.getParameterMap();
super.setCharacterEncoding(characterEncoding);
if (map == null) return parameterMap;
for (String key : map.keySet()) {
String[] values = map.get(key);
key = RequestWrapper.reDecode(key, this.getCharacterEncoding());
values = RequestWrapper.reDecode(values, this.getCharacterEncoding());
parameterMap.put(key, values);
}
} catch (UnsupportedEncodingException e) {
throw new RuntimeException(e);
}
return parameterMap;
}
@Override
public String getCharacterEncoding() {
return characterEncoding;
}
@Override
public void setCharacterEncoding(String characterEncoding) {
this.characterEncoding = characterEncoding;
}
// ---------- private ----------
private static String[] reDecode(String[] strs, String charset) {
if (strs == null) return new String[0];
String[] values = new String[strs.length];
for (int i=0, length=strs.length; i<length; i++)
values[i] = RequestWrapper.reDecode(strs[i], charset);
return values;
}
private static String reDecode(String str, String charset) {
if (str == null) return "";
if ("iso-8859-1".equalsIgnoreCase(charset)) return str;
try {
return new String(str.getBytes("iso-8859-1"), charset);
} catch (UnsupportedEncodingException e) {
throw new RuntimeException(e);
}
}
}
class Enumeration_<E> implements Enumeration<E> {
private Iterator<E> iterator = null;
Enumeration_(Iterator<E> iterator) {
this.iterator = iterator;
}
public boolean hasMoreElements() {
return iterator.hasNext();
}
public E nextElement() {
return iterator.next();
}
}

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