Java中使用Cookie

实体类

1. 用户实体类

import java.io.Serializable;
 
public class PUser implements Serializable {
    private String PUserName;
    private String Password;
}

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清.登录 Copy

1. Postman调用

2. 逻辑实现

@PostMapping("/loginPost")
public void loginPost(HttpServletRequest request, HttpServletResponse response) throws IOException {
	//设置请求编码格式
	request.setCharacterEncoding("UTF-8");
	//设置响应编码格式
	response.setCharacterEncoding("UTF-8");
	//设置数据返回的类型
	response.setContentType("text/json");
	//TODO:获取请求信息
	//账号
	String PUserNumber = request.getParameter("PUserNumber");
	//密码
	String Password = request.getParameter("password");
	//记住密码
	String remember = request.getParameter("remember");
	String str;
 
	//通过账号查询用户密码
	PUser user = findByPUserNumber(PUserNumber);
	//判断账号是否存在
	if (user != null) {
		//判断密码是否正确
		if (user.getPassword().equals(Password)) {
			str = "success";
			//判断记住密码是否选中
			if (remember != null) {
				//创建Cookie对象
				Cookie c1 = new Cookie("PUserName", PUserNumber);
				Cookie c2 = new Cookie("Password", Password);
				//设置Cookie的有效期(3天)
				c1.setMaxAge(3 * 24 * 3600);
				c2.setMaxAge(3 * 24 * 3600);
				//响应Cookie信息
				response.addCookie(c1);
				response.addCookie(c2);
			}
		} else {
			str = "密码错误，请重新输入";
		}
	} else {
		str = "该用户不存在";
	}
	PrintWriter out = response.getWriter();
	out.write(JSON.toJSONString(str));
	//刷新该流的缓冲
	out.flush();
	//关闭流
	out.close();
}

---

清.获取Cookie

1. Postman调用

2. 逻辑实现

@PostMapping("/loginPost")
public void loginPost(HttpServletRequest request, HttpServletResponse response) throws IOException {
	//设置请求编码格式
	request.setCharacterEncoding("UTF-8");
	//设置响应编码格式
	response.setCharacterEncoding("UTF-8");
	//设置数据返回的类型
	response.setContentType("text/json");
	//TODO:获取请求信息
	//账号
	String PUserNumber = request.getParameter("PUserNumber");
	//密码
	String Password = request.getParameter("password");
	//记住密码
	String remember = request.getParameter("remember");
	String str;
 
	//通过账号查询用户密码
	PUser user = findByPUserNumber(PUserNumber);
	//判断账号是否存在
	if (user != null) {
		//判断密码是否正确
		if (user.getPassword().equals(Password)) {
			str = "success";
			//判断记住密码是否选中
			if (remember != null) {
				//创建Cookie对象
				Cookie c1 = new Cookie("PUserName", PUserNumber);
				Cookie c2 = new Cookie("Password", Password);
				//设置Cookie的有效期(3天)
				c1.setMaxAge(3 * 24 * 3600);
				c2.setMaxAge(3 * 24 * 3600);
				//响应Cookie信息
				response.addCookie(c1);
				response.addCookie(c2);
			}
		} else {
			str = "密码错误，请重新输入";
		}
	} else {
		str = "该用户不存在";
	}
	PrintWriter out = response.getWriter();
	out.write(JSON.toJSONString(str));
	//刷新该流的缓冲
	out.flush();
	//关闭流
	out.close();
}

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清.清除Cookie

1. Postman调用

2. 逻辑实现

@GetMapping("/cleanCookie")
public void cleanCookie(HttpServletRequest request, HttpServletResponse response) throws IOException {
 
	//设置数据返回的类型
	response.setContentType("text/json");
	//设置请求编码格式
	request.setCharacterEncoding("UTF-8");
	//设置响应编码格式
	response.setCharacterEncoding("UTF-8");
	//设置返回值
	JSONObject jsonObject = new JSONObject();
 
	//清除用户名
	Cookie pUserName = new Cookie("PUserName", "");
	if (0 != pUserName.getMaxAge()) {
		pUserName.setMaxAge(0); //设置立即删除
		response.addCookie(pUserName);
	}
 
	//清除密码
	Cookie password = new Cookie("Password", "");
	password.setMaxAge(0); //设置立即删除
	response.addCookie(password);
 
	PrintWriter out = response.getWriter();
	jsonObject.put("success", "清除成功！");
	out.write(JSON.toJSONString(jsonObject));
	//刷新该流的缓冲
	out.flush();
	//关闭流
	out.close();
}

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工具类

1. 模拟Service返回数据

/**
 * 模拟 Service 返回数据
 *
 * @param PUserName
 * @return PUser
 */
private static PUser findByPUserNumber(String PUserName) {
	if ("靳露".equals(PUserName)) {
		return new PUser(PUserName, "12");
	}
	return null;
}