編寫filter,處理get和post中文亂碼問題
阿新 • • 發佈:2019-02-01
寫web程式遇到中文亂碼是無法避免的問題,雖然有好多框架都都做了處理,但是還是對於剛剛學習jsp和servlet的新手來說,亂碼還是不好處理,所以幾天貼出福利程式碼包裝一下Httprequest處理get亂碼問題,post亂碼只需要修改字元編碼就好了
所以只需要包裝處理一下get請求就好了程式碼如下
package com.leige.filter;
import java.io.UnsupportedEncodingException;
import java.util.Enumeration;
import java.util.Map;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletRequestWrapper;
/**
* 對GET請求引數加以處理!
* @author qdmmy6
*
*/
public class GetRequest extends HttpServletRequestWrapper {
private HttpServletRequest request;
private String charset;
public GetRequest(HttpServletRequest request, String charset) {
super (request);
this.request = request;
this.charset = charset;
}
@Override
public String getParameter(String name) {
// 獲取引數
String value = request.getParameter(name);
if(value == null) return null;//如果為null,直接返回null
try {
// 對引數進行編碼處理後返回
return new String(value.getBytes("ISO-8859-1"), charset);
} catch (UnsupportedEncodingException e) {
throw new RuntimeException(e);
}
}
@SuppressWarnings({ "unchecked", "rawtypes" })
@Override
public Map getParameterMap() {
Map<String,String[]> map = request.getParameterMap();
if(map == null) return map;
// 遍歷map,對每個值進行編碼處理
for(String key : map.keySet()) {
String[] values = map.get(key);
for(int i = 0; i < values.length; i++) {
try {
values[i] = new String(values[i].getBytes("ISO-8859-1"), charset);
} catch (UnsupportedEncodingException e) {
throw new RuntimeException(e);
}
}
}
// 處理後返回
return map;
}
@Override
public String[] getParameterValues(String name) {
String[] values = super.getParameterValues(name);
for(int i = 0; i < values.length; i++) {
try {
values[i] = new String(values[i].getBytes("ISO-8859-1"), charset);
} catch (UnsupportedEncodingException e) {
throw new RuntimeException(e);
}
}
return values;
}
}
編寫filter
package com.leige.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.http.HttpServletRequest;
public class EncodingFilter implements Filter {
private String charset = "UTF-8";
@Override
public void destroy() {}
@Override
public void doFilter(ServletRequest request, ServletResponse response,
FilterChain chain) throws IOException, ServletException {
HttpServletRequest req = (HttpServletRequest) request;
if(req.getMethod().equalsIgnoreCase("GET")) {
if(!(req instanceof GetRequest)) {
req = new GetRequest(req, charset);//處理get請求編碼
}
} else {
req.setCharacterEncoding(charset);//處理post請求編碼
}
chain.doFilter(req, response);
}
@Override
public void init(FilterConfig fConfig) throws ServletException {
String charset = fConfig.getInitParameter("charset");
if(charset != null && !charset.isEmpty()) {
this.charset = charset;
}
}
}
最後在web.xml中配置filter就可以處理中文亂碼了,伺服器使用什麼編碼就在程式碼中修改即可