利用注解来保存uri

@Target(ElementType.METHOD)
@Retention(RetentionPolicy.RUNTIME)
@Documented
@Mapping
public @interface MarkRequest{
    String value() default "returnURI";
    String scope() default "session"
    String[] excludes() default {};
}

//根据有无@MarkRequest注解来判断是否应当向request或session域中保存请求的uri
public void postHandle(HttpServletRequest request,HttpServletResponse response,Object handler,ModelAndView modelAndView){
    if(handler instanceof HandlerMethod)}{
        
        HandlerMethod hm=(HandlerMethod)handler;
        
        MarkRequest markRequest=hm.getMethodAnnotation(MarkRequest.class);
        
        if(markRequest!=null){
            
            String name=markRequest.value();
            
            String scope=markRequest.scope();
            
            String[] excludes= markRequest.excludes();    //不需要保存的uri请求参数
            
            markRequestInfo(request,scope,name,excludes);
        }
    }
}

/**
*    向request域或session域中保存请求的uri
*/
public void markRequestInfo(HttpServletRequest request,String scope,String name,String[] excludes){
    
    List excludeParamList=Arrays.asList(excludes);
    
    String uri=getRequestInfo(request,false,excludeParamList);
    
    if("request".equals(scope)){
        
        request.setAttribute(name,uri);
        
    }else if("session".equals(scope)){
        
        request.getSession().setAttribute(name,uri);
    }
}

public String getRequestInfo(HttpServletRequest request,boolean trimContextPath,List excludeParamList){
    
    String uri=request.getRequestURI();
    
    //是否去掉应用名
    if(trimContextPath){
        
        String contextPath = request.getContextPath();
        
        if(uri.startsWith(contextPath)){
            
            uri = uri.substring(contextPath.length());
        }
    }
    
    //往uri中添加请求参数
    Map<String, String[]> paramMap=(Map<String, String[]) request.getParameterMap();
    
    uri = uri + "?";
    
    if(!paramMap.isEmpty()){
        
        for(Map.Entry<String,String[]> entry : paramMap.entrySet()){
            
            String key = entry.getKey();
            
            if(!excludeParamList.contains(key)){
                
                String[] values= entry.getValue();
                
                for(int i=0; i< values.length; i++){

                //url中的请求参数，应当使用URIEncoder把普通字符串转换成application/x-www-form-urlencoded字符串

                uri += (key + "=" + URIEncoder.encode(values[i],"utf-8") + "&");
                
                }
            }
        }
    }
    
    //去掉去掉uri中的最后一个‘&‘字符
    return uri.substring(0,uri.length()-1);
}