com.gitee.summer9102.develop.common.util.CommonUtil Maven / Gradle / Ivy
package com.gitee.summer9102.develop.common.util;
import javax.servlet.http.HttpServletRequest;
import java.io.UnsupportedEncodingException;
import java.net.URLDecoder;
import java.net.URLEncoder;
import java.util.*;
import java.util.function.Function;
import java.util.function.Predicate;
import java.util.regex.Pattern;
public class CommonUtil {
/**
* 拼接string
*
* @param list 集合
* @param split 分隔符
* @param key 元素取值方法
*/
public static String listToString(List list, String split, Function key) {
boolean first = true;
StringBuilder b = new StringBuilder();
for (T t : list) {
if (first) {
first = false;
} else {
b.append(split);
}
b.append(key.apply(t));
}
return b.toString();
}
/**
* 拼接string
*
* @param array 数组
* @param split 分隔符
* @param key 元素取值方法
*/
public static String listToString(T[] array, String split, Function key) {
StringBuilder b = new StringBuilder();
for (int i = 0; i < array.length; i++) {
if (i > 0) {
b.append(split);
}
b.append(key.apply(array[i]));
}
return b.toString();
}
/**
* 获取ip
*
* @param request request
*/
public static String getClientIp(HttpServletRequest request) {
String ip = request.getHeader("x-forwarded-for");
if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
ip = request.getHeader("Proxy-Client-IP");
}
if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
ip = request.getHeader("WL-Proxy-Client-IP");
}
if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
ip = request.getRemoteAddr();
}
return ip;
}
/**
* 获取request参数
*
* @param request
* @return
*/
public static Map getRequestParam(HttpServletRequest request) {
Map requestParams = request.getParameterMap();
Map params = new HashMap<>(requestParams.size());
requestParams.forEach((name, values) -> {
String valueStr = listToString(values, ",", Function.identity());
params.put(name, valueStr);
});
return params;
}
/**
* 获取url正则对象
*
* @return
*/
public static Pattern getUrlPattern() {
return Pattern.compile("(https?)://[-A-Za-z0-9+&@#/%?=~_|!:,.;]+[-A-Za-z0-9+&@#/%=~_|]");
}
/**
* Stream.filter()去重方法
*
* @param key
* @param
* @return
*/
public static Predicate distinctByKey(Function key) {
Set