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          Java WEB开发乱码问题

一.Servlet乱码问题的解决
利用filter和request.getParamter()方法即可解决，直接上代码
1.CodeFilter：过滤器拦截所有请求
public class CodeFilter implements Filter{

@Overridepublic void destroy() {}@Overridepublic void doFilter(ServletRequest req, ServletResponse resp,        FilterChain chain) throws IOException, ServletException {    HttpServletRequest request =(HttpServletRequest) req;    String method =request.getMethod().toLowerCase();    if("post".equals(method)){        request.setCharacterEncoding("UTF-8");    }else{        request=new MyHttpservletrequest(request);    }    chain.doFilter(request, resp);}@Overridepublic void init(FilterConfig arg0) throws ServletException {}

}
2.MyHttpservletrequest：重写getParamter()方法

public class MyHttpservletrequest extends HttpServletRequestWrapper{

public MyHttpservletrequest(HttpServletRequest request) {    super(request);}@Overridepublic String getParameter(String name) {    String value=name;    if(value!=null){        try {            value =new String(super.getParameter(value).getBytes("ISO-8859-1"),"UTF-8");        } catch (UnsupportedEncodingException e) {            e.printStackTrace();        }    }    return value;}

}

二.struts2解决乱码问题
与servlet解决乱码类似，只是struts2通过getParamterMap()获取参数,所以要重写getParamterMap()方法
1.EncodingFilter
//继承Struts默认的过滤器:StrutsPrepareAndExecuteFilter
public class EncodingFilter extends StrutsPrepareAndExecuteFilter {

@Overridepublic void doFilter(ServletRequest req, ServletResponse resp,        FilterChain chain) throws IOException, ServletException {    HttpServletRequest request = (HttpServletRequest) req;    if(request.getMethod().equalsIgnoreCase("get")){        request = new MyHttpRequest(request);    }    request.setCharacterEncoding("UTF-8");    super.doFilter(request, resp, chain);}

}
2.重写getparamterMap()的request：MyHttpRequest
public class MyHttpRequest extends HttpServletRequestWrapper {

public MyHttpRequest(HttpServletRequest request) {    super(request);} //struts内部使用getparameterMap()获取请求参数/** * 重写getParameterMap()方法 */@Overridepublic Map<String, String[]> getParameterMap() {    Map<String, String[]> map = super.getParameterMap();    Map<String, String[]> nMap = new HashMap<String, String[]>();    String[] value = null;    for (String key : map.keySet()) {          value = new String[map.get(key).length];        for (int i = 0; i < map.get(key).length; i++) {            try {                value[i] = new String(                        map.get(key)[i].getBytes("ISO-8859-1"), "utf-8");                nMap.put(key, value);            } catch (UnsupportedEncodingException e) {                e.printStackTrace();            }        }    }    return nMap;}

}

三.SpringMVC解决乱码：
SpringMVC通过getParamterValues()获取参数,所以要重写getParamterValues()方法
1.MyEncodingFilter
public class MyEncodingFilter extends CharacterEncodingFilter{

@Overrideprotected void doFilterInternal(HttpServletRequest request,        HttpServletResponse response, FilterChain filterChain)        throws ServletException, IOException {      if(request.getMethod().equalsIgnoreCase("post")){          super.setEncoding("utf-8");      }else if(request.getMethod().toLowerCase().equalsIgnoreCase("get")){          request = new MyHttpRequest(request);      }    super.doFilterInternal(request, response, filterChain);}

}
2.MyHttpRequest ：负责重写getPramterValues()方法
//springMVC 获取前台参数用:getParamterValues
public class MyHttpRequest extends HttpServletRequestWrapper {

private HttpServletRequest request;public MyHttpRequest(HttpServletRequest request) {    super(request);    this.request = request;}@Overridepublic String[] getParameterValues(String name) {    String value = name;    String[] reqestValue = new String[] { "" };    if (value == null) {        return super.getParameterValues(value);    } else {        reqestValue = request.getParameterValues(name);        for (int i = 0; i < reqestValue.length; i++) {            try {                String str = new String(                        reqestValue[i].getBytes("iso8859-1"), "utf-8");                reqestValue[i] = str;            } catch (UnsupportedEncodingException e) {                e.printStackTrace();            }        }        return reqestValue;    }}

}

以上就是Java web开发常遇到的乱码的问题的解决方案，不对的地方请大家指正

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