j2ee常用方法

private List<String> strToListString(String s){
        List<String> list = new ArrayList<>();
        String[] split = s.split(",");

        for(int i=0;i<split.length;i++) {
            list.add(split[i]);
        }
        return list;
    }

 private static String listToString(List<String> list){
        StringBuilder sb=new StringBuilder();
        for (int i = 0; i < list.size(); i++) {
            if (i != list.size() - 1) {
                sb.append(list.get(i) + ",");
            }else{
                sb.append(list.get(i));
            }
        }
        return sb.toString();
    }

　　

spring-beans-xx.xx.jar

package org.springframework.beans;

BeanUtils

    public static void copyProperties(Object source, Object target, String... ignoreProperties) throws BeansException {
        copyProperties(source, target, (Class)null, ignoreProperties);
    }

commons-collections-xx-xx.jar

package org.apache.commons.collections;

CollectionUtils

 public static boolean isEmpty(Collection coll) {
        return (coll == null || coll.isEmpty());
    }

commons-lang-xx-xx.jar

package org.apache.commons.lang;

StringUtils

    public static boolean isNotEmpty(String str) {
        return !StringUtils.isEmpty(str);
    }

public static boolean isEmpty(String str) {
        return str == null || str.length() == 0;
    }

 异常堆栈信息转字符窜

 public static String getErrorInfoFromException(Exception e) {
        try {
            StringWriter sw = new StringWriter();
            PrintWriter pw = new PrintWriter(sw);
            e.printStackTrace(pw);
            return "
" + sw.toString() + "
";
        } catch (Exception e2) {
            return "bad getErrorInfoFromException";
        }
    }

 去空格后是否空字符

private boolean isNotEmptyAfterTrim(String s){
        if (StringUtils.isNotEmpty(s)){
            if (s.trim().length()!=0){
                return true;
            }
        }
        return false;
    }

字符窜格式化