Java WEB开发乱码问题

          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{

@Override
public void destroy() {}

@Override
public 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);

}

@Override
public void init(FilterConfig arg0) throws ServletException {}

}
2.MyHttpservletrequest：重写getParamter()方法

public class MyHttpservletrequest extends HttpServletRequestWrapper{

public MyHttpservletrequest(HttpServletRequest request) {
    super(request);
}

@Override
public 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 {

@Override
public 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
 */
@Override
public Map getParameterMap() {
    Map map = super.getParameterMap();
    Map nMap = new HashMap();
    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{

@Override
protected 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;

}

@Override
public 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