javaweb/javaEE解决中文乱码

form两种传递数据的方式（post/get），只有get方式需要处理中文乱码。 通过filter过滤处理中文乱码 单独封装一个处理类

@WebFilter(//属性=属性值，属性和属性值用逗号隔开
//分配类型
  dispatcherTypes = {
    DispatcherType.REQUEST, 
    DispatcherType.FORWARD, 
    DispatcherType.INCLUDE
  }
  
  urlPatterns = { "/*" }, 
  //初始化参数和值
  initParams = { 
    @WebInitParam(name = "encode", value = "utf-8")
  })
  public class EcondingFilter implements Filter {
 String encode=null;//设置编码
 public EcondingFilter() {
        // TODO Auto-generated constructor stub
    }
    public void destroy() {
  // TODO Auto-generated method stub
 }
 //处理过滤
 public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException {
 //将dofilter的参数进行向下转型
 HttpServletRequest req=(HttpServletRequest)request;
  HttpServletResponse resp=(HttpServletResponse)response;
  MyRequest myprqyuest=new MyRequest(req);
  resp.setCharacterEncoding(encode);
  resp.setContentType("text/html;charset="+encode);
  chain.doFilter(myprqyuest, resp);//将过滤放行
  }
  public void init(FilterConfig fConfig) throws ServletException {
  this.encode=fConfig.getInitParameter("encode");
  }
  }
  //自定义一个处理类继承HttpServletRequestWrapper 
class MyRequest extends HttpServletRequestWrapper {
 HttpServletRequest request;
 //构造函数
 public MyRequest(HttpServletRequest request) {
  super(request);
  this.request=request;
  }
  @Override
 public String getParameter(String name) {
  String method=request.getMethod();
  String value=null; 
  try {
   request.setCharacterEncoding("UTF-8");
   value=request.getParameter(name);
  if ("get".equals(method)) {
   value=new String(value.getBytes("iso-8859-1"), "UTF-8");
  }
  }catch (Exception e) {
    e.printStackTrace();
  }
  return value;
  }
//通过一个name获得多个值
//对请求对象的包装
@Override
 public String[] getParameterValues(String name) {
  String method=request.getMethod();
  String[] values=null;
  try {
   request.setCharacterEncoding("UTF-8");
   values=request.getParameterValues(name);
   if("get".equals(method)) {
    int i=0;
    for(String str:values) {
     values[i]=new String(str.getBytes("iso-8859-1"),"utf-8");
     i++;
    }
   }
  }catch (Exception e) {
    e.printStackTrace();
  }
  return values;
  }
  }

注意： **1、**注解的格式： 注解名（属性1=属性值，属性2=属性值，属性和属性值用逗号隔开） 注解名（属性1={属性值，属性值}，属性2=属性值） 例如：@WebFilter( dispatcherTypes = { DispatcherType.REQUEST, DispatcherType.FORWARD, DispatcherType.INCLUDE } urlPatterns = { "/*" }, //初始化参数和值 initParams = { @WebInitParam(name = "encode", value = "utf-8") }) **2、**过滤器放行时，必须使用包装的请求对象（如果对响应对象也进行的包装，则放行时也必须用包装后的响应） 例如： HttpServletRequest req=(HttpServletRequest)request; HttpServletResponse resp=(HttpServletResponse)response; resp.setCharacterEncoding(encode); resp.setContentType("text/html;charset="+encode); MyRequest myprqyuest=new MyRequest(req); chain.doFilter(myprqyuest, resp);