过滤特殊字符等等.txt

java开发中经常用到的代码

//过滤特殊字符
public static String encoding(String src){
        if (src==null)
            return "";
        StringBuilder result=new StringBuilder();
        if (src!=null){
            src=src.trim();
            for (int pos=0;pos<src.length();pos++){
                switch(src.charAt(pos)){
                    case '\"':result.append("&quot;");break;
                    case '<':result.append("&lt;");break;
                    case '>':result.append("&gt;");break;
                    case '\'':result.append("&apos;");break;
                    case '&':result.append("&amp;");break;
                    case '%':result.append("&pc;");break;
                    case '_':result.append("&ul;");break;
                    case '#':result.append("&shap;");break;
                    case '?':result.append("&ques;");break;
                    default:result.append(src.charAt(pos));break;
                }
            }
        }
        return result.toString();
    }
    
//反过滤特殊字符
    public static String decoding(String src){
        if (src==null)
            return "";
        String result=src;
        result=result.replace("&quot;", "\"").replace("&apos;", "\'");
        result=result.replace("&lt;", "<").replace("&gt;", ">");
        result=result.replace("&amp;", "&");
        result=result.replace("&pc;", "%").replace("&ul", "_");
        result=result.replace("&shap;", "#").replace("&ques", "?");
        return result;
    }

//利用反射调用一个继承层次上的函数族，比如安装程序，有安装数据库的，安装文件系统的等，命名均已“install”开始，你就可以将参数part设为“install”，src是其实类实例，root是终止父类
    public static <T> void invokeMethods(String part,T src,Class root) throws ExceptionManager{
        if (root!=null){
            if (!root.isInstance(src))return;
            root=(Class)root.getGenericSuperclass();
        }
        HashMap<String,Method> invokees=new HashMap<String,Method>();
        Class target=src.getClass();
        do{
            Method [] methods=target.getDeclaredMethods();
            for (Method method:methods){
                String mn=method.getName();
                Boolean isPass=mn.startsWith(part);
                if (isPass){
                    Integer nopt=method.getParameterTypes().length;
                    Boolean isStatic=Modifier.isStatic(method.getModifiers());
                    if ((nopt==0)&&(!isStatic)){
                        if (!invokees.containsKey(mn))
                            invokees.put(mn, method);
                    }
                }
            }
            target=(Class)target.getGenericSuperclass();
        }while(target!=root);
        Iterator<String> methods=invokees.keySet().iterator();
        while (methods.hasNext()){
            Method invokee=invokees.get(methods.next());
            Boolean access=invokee.isAccessible();
            invokee.setAccessible(true);
            try {
                invokee.invoke(src);
            } catch (InvocationTargetException e) {
                throw ExceptionManager.wrap(e.getTargetException());
            }catch (Exception e){}
            invokee.setAccessible(access);
        }
    }