JAVA工具类如何获取HttpServletRequest和HttpServletResponse对象呢?

下文笔者讲述java工具类获取HttpServletRequest和HttpServletResponse对象的方法及示例分享,如下所示

添加依赖

  <!-- Spring Web -->
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-web</artifactId>
            <version>5.2.12.RELEASE</version>
        </dependency>


        <!-- Java Servlet -->
        <dependency>
            <groupId>javax.servlet</groupId>
            <artifactId>javax.servlet-api</artifactId>
            <version>4.0.1</version>
        </dependency>

ServletUtils.java

import org.springframework.web.context.request.RequestAttributes;
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.util.Enumeration;
import java.util.LinkedHashMap;
import java.util.Map;

/**
 * 工具类
 *
 */
public class ServletUtils {

    /**
     * 获取String参数
     * @param name 参数名
     */
    public static String getParameter(String name) {
        return getRequest().getParameter(name);
    }


    /**
     * 获取request
     */
    public static HttpServletRequest getRequest() {
        try {
            return getRequestAttributes().getRequest();
        } catch (Exception e) {
            return null;
        }
    }

    /**
     * 获取response
     */
    public static HttpServletResponse getResponse() {
        try {
            return getRequestAttributes().getResponse();
        } catch (Exception e) {
            return null;
        }
    }

    /**
     * 获取session
     */
    public static HttpSession getSession() {
        return getRequest().getSession();
    }


    public static ServletRequestAttributes getRequestAttributes() {
        try {
            RequestAttributes attributes = RequestContextHolder.getRequestAttributes();
            return (ServletRequestAttributes) attributes;
        } catch (Exception e) {
            return null;
        }
    }

    /**
     * 获取请求头所有数据
     * @param request
     * @return
     */
    public static Map<String, String> getHeaders(HttpServletRequest request) {
        Map<String, String> map = new LinkedHashMap<>();
        Enumeration<String> enumeration = request.getHeaderNames();
        if (enumeration != null) {
            while (enumeration.hasMoreElements()) {
                String key = enumeration.nextElement();
                String value = request.getHeader(key);
                map.put(key, value);
            }
        }
        return map;
    } 
}