StringUtil

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import java.io.IOException;import java.io.UnsupportedEncodingException;import java.util.HashMap;import java.util.Iterator;import java.util.LinkedHashMap;import java.util.List;import java.util.Map;import org.apache.commons.lang.StringUtils;import org.slf4j.Logger;import org.slf4j.LoggerFactory;public class StringUtil {    private static Logger logger = LoggerFactory.getLogger(StringUtil.class);     public static String getString(String str) {        if(null == str || str.trim().length() == 0) {            str = "";        }        return str.trim();    }    /**     *      * @Title: isEmpty      * @Description: 字符串是否为空      * @param str     * @return     */    public static boolean isEmpty(String str){        if(null == str || str.trim().length()==0){            return true;        }        return false;    }    /**     *      * @Title: isChinese      * @Description: 判断单个字符是否是汉字      * @param mychar     * @return     */    public static boolean isChinese(char mychar){        int v = (int)mychar;        return(v>=19968 && v<=171941);    }    /**     *      * @Title: containsChinese      * @Description: 判断是否包含汉字  true 是，false 否     * @param s     * @return     */    public static boolean containsChinese(String s){        if(null == s || "".equals(s.trim())){            return false;        }        for(int i = 0;i<s.length();i++){            if(isChinese(s.charAt(i)))return true;        }        return false;    }    /**     *      * @Title: isChineseAll      * @Description: 判断是否全为汉字，true 是，false 否     * @param s     * @return     */    public static boolean isChineseAll(String s){        if(null==s||"".equals(s.trim())){            return false;        }        for(int i= 0;i<s.length();i++){            if(!isChinese(s.charAt(i)))return false;        }        return true;    }    /**     * 把字符串数组转为以英文逗号分割的字符串     * @param str      * @return     */    public static String getStringFromArray(String[] str) {        String source = "";        for(String s:str){            source += s+",";        }        source = source.substring(0,source.length()-1);        return source;    }    /**     * 把字符串数组转为以英文逗号分割的字符串     * @param str      * @return     */    public static String getStringFromList(List<Integer> str) {        String source = "";        Iterator<Integer> it = str.iterator();        while(it.hasNext()){            source += it.next() + ",";        }        source = source.substring(0,source.length()-1);        return source;    }    /**     * 把字符串数组转为以英文逗号分割的字符串     * @param str      * @return     */    public static String getStringFromListStr(List<String> str) {        String source = "";        Iterator<String> it = str.iterator();        while(it.hasNext()){            source += it.next() + ",";        }        source = source.substring(0,source.length()-1);        return source;    }    public static String getNameStrFromIdArray(Map<String,String> keyValue,String[] idArray){        String nameString = "";        for(int i = 0 ;i<idArray.length;i++){            nameString += keyValue.get(idArray[i])+",";        }        nameString = nameString.substring(0,nameString.length()-1);        return nameString;    }    /**     *      * @Title: isEmail      * @Description: 字符串是否是一个 email     * @param str     * @return     */    public static boolean isEmail(String str){        if(StringUtil.isEmpty(str)){            return false;        }        String reg = "(\\w+)@(\\w+\\.\\w+)";         if(str.matches(reg)){            return true;        }        return false;    }    /**     * 将格式为：姓名##邮箱&&姓名##邮箱...的字符串拆分为hashmap中     * @param str     * @return     */    public static LinkedHashMap<String,String> stringToMap(String str){        LinkedHashMap<String, String> map = new LinkedHashMap<String, String>();        String[] bb = str.split("&&");        for(int i=0;i<bb.length;i++){            String[] cc = bb[i].split("##");            map.put(cc[0], cc[1]);        }        return map;    }    public static String getImpCodeStr(List<String> codes,List<String> subcodes){        StringBuffer codebuf=new StringBuffer();        codes.retainAll(subcodes);        if(codes!=null&&codes.size()>0){            codebuf.append("【");            for(String code:codes){                codebuf.append(code+",");            }            codebuf.deleteCharAt(codebuf.length() - 1);            codebuf.append("】");        }        return codebuf.toString();    }    public static String getUpdCodeStr(List<String> codes,List<String> subcodes){        StringBuffer codebuf=new StringBuffer();        subcodes.retainAll(codes);        codes.removeAll(subcodes);        if(codes!=null&&codes.size()>0){            codebuf.append("【");            for(String code:codes){                codebuf.append(code+",");            }            codebuf.deleteCharAt(codebuf.length() - 1);            codebuf.append("】");        }        return codebuf.toString();    }    /**     *     * @Title: cutStr     * @Description: 处理字符串长度，超过指定长度的部分使用"..."代替    * @param @param str 字符串    * @param @param length 指定长度    * @return String    返回类型     * @throws     */    public static String cutStr(String str, int length) {        if (str == null || "".equals(str)) {            return "";        }        String resultStr = "";        char[] ch = str.toCharArray();        int count = ch.length;        for (int i = 0; i < count; i++) {            resultStr += ch[i];            try {                if (resultStr.getBytes("UTF-8").length >= length - 3) {                    resultStr += "...";                    break;                }            } catch (UnsupportedEncodingException e) {                //e.printStackTrace();            }        }        return resultStr;    }    /**     *     * @Title: cutStr2     * @Description:  处理字符串长度，超过指定长度的部分不显示    * @param @param str 字符串    * @param @param length 指定长度    * @return String    返回类型     * @throws     */    public static String cutStr2(String str, int length) {        if (str == null || "".equals(str)) {            return "";        }        String resultStr = "";        char[] ch = str.toCharArray();        int count = ch.length;        for (int i = 0; i < count; i++) {            resultStr += ch[i];            try {                if (resultStr.getBytes("UTF-8").length >= length) {                    break;                }            } catch (UnsupportedEncodingException e) {                //e.printStackTrace();            }        }        return resultStr;    }    /***     * 处理HTML,将& lt;|&lt或者& gt;|&gt转换为<和>     * @param writer     * @param string     * @return     * @throws IOException     */    public static String unescapeHtml(String string){        String returnString = "";        if(!StringUtils.isEmpty(string)){           string = string.replaceAll("& lt;|&lt;", "<");           returnString = string.replaceAll("& gt;|&gt;", ">");        }else{            string = "";        }        return returnString;    }    public static void main(String[] args){        String aa = "&lt;p& gt;李小龙到底有多牛 武打明星自愧不如&lt;/p&gt;";        System.out.println(unescapeHtml(aa));    }
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