cn.xuqiudong.common.base.tool.Tools Maven / Gradle / Ivy
package cn.xuqiudong.common.base.tool;
import com.fasterxml.jackson.databind.ObjectMapper;
import org.springframework.util.StringUtils;
import org.springframework.web.context.request.RequestContextHolder;
import org.springframework.web.context.request.ServletRequestAttributes;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import java.io.IOException;
import java.io.PrintWriter;
import java.util.UUID;
/**
* 系统级别的工具类
*
* @author VIC
*/
public class Tools {
private static final String ROOT_PATH = "/";
/**
* 获得当前线程中的request
*
* @throws IllegalStateException 当前线程中不存在 Request 上下文
*/
public static HttpServletRequest currentRequest() {
ServletRequestAttributes attr = getServletRequestAttributes();
return attr.getRequest();
}
/**
* 当前线程中的currentResponse
* @return
* @throws IllegalStateException 当前线程中不存在 Request 上下文
*/
public static HttpServletResponse currentResponse() {
ServletRequestAttributes attr = getServletRequestAttributes();
return attr.getResponse();
}
private static ServletRequestAttributes getServletRequestAttributes() {
ServletRequestAttributes attr = (ServletRequestAttributes) RequestContextHolder.getRequestAttributes();
if (attr == null) {
throw new IllegalStateException("当前线程中不存在 Request 上下文");
}
return attr;
}
/**
* 获得当前线程中的session 不存在则返回null
*
* @return
*/
public static HttpSession currentSession() {
ServletRequestAttributes attr = (ServletRequestAttributes) RequestContextHolder.getRequestAttributes();
if (attr == null) {
return null;
}
return attr.getRequest().getSession(false);
}
static ObjectMapper objectMapper = new ObjectMapper();
/**
* 通过response输出JSON
*
* @return
*/
public static void writeJson(Object obj, HttpServletResponse response) {
response.setCharacterEncoding("UTF-8");
response.setContentType("application/json; charset=utf-8");
PrintWriter out = null;
try {
out = response.getWriter();
out.print(objectMapper.writeValueAsString(obj));
} catch (IOException e) {
e.printStackTrace();
} finally {
if (out != null) {
out.close();
throw new RuntimeException("Terminate here");
}
}
}
/**
* 获得当前请求的URL(不包含工程名)：
*
* http://localhost:8080/project/user?key=123 → /user
*
*/
public static String getRequestUrl(HttpServletRequest request) {
//获得工程名
String contextPath = request.getContextPath();
//获得包含工程名的当前页面全路径
String uri = request.getRequestURI();
//去掉相对地址中的参数
int i = uri.indexOf("?");
if (i < 0) {
i = uri.length();
}
return uri.substring(contextPath.length(), i);
}
/**
* 获取根地址：即工程名前缀 + 工程名
*
* http://localhost:8080/project/user?key=123 → http://localhost:8080/project
* 其中test是工程名
*
*/
public static String getRootUrl(HttpServletRequest request) {
//地址栏的地址
String url = request.getRequestURL().toString();
//获得包含工程名的当前页面全路径
String uri = request.getRequestURI();
if (uri != null && !ROOT_PATH.equals(uri) && url.indexOf(uri) > -1) {
url = url.substring(0, url.indexOf(uri));
}
//去掉工程名以后的部分
String contextPath = request.getContextPath();
if (StringUtils.hasText(contextPath)) {
return url + ROOT_PATH + contextPath;
}
return url;
}
/**
* 获得当前请求的完整路径：包含协议和请求参数 : http://localhost:8080/test/user?key=123
*
* @param request
* @return
*/
public static String getCurrentUrl(HttpServletRequest request) {
return new StringBuilder().append(request.getRequestURL())
.append(request.getQueryString() == null ? "" : "?" + request.getQueryString()).toString();
}
/**
* 随机生成一个uuid
*/
public static String randomUuid() {
return UUID.randomUUID().toString().replaceAll("-", "");
}
/**
* 是否是ajax请求
* @param request
* @return
*/
public static boolean isAjax(HttpServletRequest request) {
String header = request.getHeader("X-Requested-With");
return "XMLHttpRequest".equalsIgnoreCase(header);
}
}