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