download:Python工程师面试宝典一线大厂资深面试官亲授

Python服务端工程师学什么，面试问什么，你该准备什么？别苦恼，别害怕，别纠结，这门课程带你系统梳理面试知识，增加面试成功几率，提升后端开发技能，在面试之前解决你的各种问题，让你技术实力和面试技巧得到双重提升。

适合人群

Python服务端工程师(后端工程师)

初/中级 web 开发者和全栈开发者

使用 Python 语言的开发者

(运维工程师,爬虫工程师,数据分析师等)

技术储备要求

掌握Python编程语言

会使用Python进行网站开发，了解网站工作原理

有一定的网站后端基础知识
public Book() {
}

public Book(String id, String name, String price, String auth,
        String publish, String description) {
    super();
    this.id = id;
    this.name = name;
    this.price = price;
    this.auth = auth;
    this.publish = publish;
    this.description = description;
}
public String getDescription() {
    return description;
}
public void setDescription(String description) {
    this.description = description;
}
public String getId() {
    return id;
}
public void setId(String id) {
    this.id = id;
}
public String getName() {
    return name;
}
public void setName(String name) {
    this.name = name;
}
public String getPrice() {
    return price;
}
public void setPrice(String price) {
    this.price = price;
}
public String getAuth() {
    return auth;
}
public void setAuth(String auth) {
    this.auth = auth;
}
public String getPublish() {
    return publish;
}
public void setPublish(String publish) {
    this.publish = publish;
}

}

import java.util.LinkedHashMap;
import java.util.Map;
import cn.huiyu.ben.Book;
public class BookDao {
private static Map<String,Book> bookMap = new LinkedHashMap<String, Book>();
private BookDao() {
}
static{
bookMap.put("1", new Book("1","1111","11.0","zqwang","111出版社","111111111"));
bookMap.put("2", new Book("2","2222","22.0","zqwang","222出版社","222222222"));
bookMap.put("3", new Book("3","3333","33.0","zqwang","333出版社","333333333"));
}

public static Map<String,Book> getBooks(){
    return bookMap;
}

public static Book getBook(String id){
    return bookMap.get(id);
}

}

public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
response.setContentType("text/html;charset=utf-8");
//1.查询数据库中一切的书展现
Map<String,Book> map = BookDao.getBooks();
for(Map.Entry<String , Book> entry : map.entrySet()){
Book book = entry.getValue();
response.getWriter().write("<a href='"+request.getContextPath()+"/servlet/BookInfoServlet?id="+book.getId()+"'>"+book.getName()+"
");
}
response.getWriter().write("
");

    //2.显现之前看过的书
    Cookie [] cs = request.getCookies();
    Cookie findC = null;
    if(cs!=null){
        for(Cookie c : cs){
            if("last".equals(c.getName())){
                findC = c;
            }
        }
    }
    if(findC == null){
        response.getWriter().write("没有看过任何书!");
    }else{
        response.getWriter().write("您曾经阅读过的书:

");
String[] ids = findC.getValue().split(",");
for(String id : ids){
Book book = BookDao.getBook(id);
response.getWriter().write(book.getName()+"
");
}
}
}

public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
response.setContentType("text/html;charset=utf-8");
//1.获取要看的书的id,查询数据库找出书,输出书的细致信息
String id = request.getParameter("id");
Book book = BookDao.getBook(id);
if(book==null){
response.getWriter().write("找不到这本书!");
return;
}else{
response.getWriter().write("
书名:"
+book.getName()+"");
response.getWriter().write("
作者:"
+book.getAuth()+"");
response.getWriter().write("
售价:"
+book.getPrice()+"");
response.getWriter().write("
出版社:"
+book.getPublish()+"");
response.getWriter().write("
描画信息:"
+book.getDescription()+"");
}

    //2.发送cookie保管最后看过的书
    // --- 1 --> 1
    // 1 --2,1 --> 2,1
    // 2,1--3,2,1 --> 3,2,1
    // 3,2,1 -- 4,3,2 --> 4,3,2
    // 4,3,2 --3,4,2 --> 3,4,2
    String ids = "";

    Cookie [] cs = request.getCookies();
    Cookie findC = null;
    if(cs!=null){
        for(Cookie c : cs){
            if("last".equals(c.getName())){
                findC = c;
            }
        }
    }

    if(findC == null){
        //阐明之前没有看过书的记载
        ids += book.getId();
    }else{
        //阐明之前有历史看过的书的记载,需求依据历史记载算一个新的记载出来
        String [] olds = findC.getValue().split(",");
        StringBuffer buffer = new StringBuffer();
        buffer.append(book.getId()+",");
        for(int i = 0;i<olds.length && buffer.toString().split(",").length<3 ;i++){
            String old = olds[i];
            if(!old.equals(book.getId())){
                buffer.append(old+",");
            }
        }
        ids = buffer.substring(0, buffer.length()-1);
    }

    Cookie lastC = new Cookie("last",ids);
    lastC.setMaxAge(3600*24*30);
    lastC.setPath(request.getContextPath());
    response.addCookie(lastC);
}