TomCat的目录结构
Bin：脚本目录(存放启动、关闭这些命令)
Conf:存放配置文件的目录
Lib:存放jar包
Logs: 存放日志文件
Temp： 临时文件
Webapps： 项目发布目录
Work: jsp文件编译后生成的.java文件和.class文件存放的目录
请求行,请求头和请求体
请求行:
请求方法 请求URL HTTP版本
请求头:
Host:
User-Agent:
Accept:
Accept-Language
Accept-Encoding:
Referer:
onnection:
Cookie:
请求体:
get没有请求体,即跟在URL后面,post有请求体,不展示在地址栏里
响应行,响应头和响应体
1 响应行:
2 HTTP协议 状态码
3 响应头:
4 Accept-Ranges: bytes
5 Cache-Control: max-age=0
6 Connection: keep-alive
7 Content-Length: 114
8 Content-Type: text/html
9 Date: Sun, 01 Sep 2019 14:09:54 GMT
10 Etag: "5d2c473c-72"
11 Expires: Sun, 01 Sep 2019 14:09:54 GMT
12 Last-Modified: Mon, 15 Jul 2019 09:28:28 GMT
13 Server: nginx
14 请求体:
15 图片,文本,html ......
Get请求乱码和Post请求乱码和响应乱码
get乱码
username = new String(username.getBytes("ISO-8895-1"),"utf-8")
设置xml URIEncoding"UTF-8";
Post乱码
request.setCharacterEncoding("UTF-8");
response.setContextType("text/html;charset=utf-8");
servlet 入门和执行流程
问题：为什么在浏览器输入http://localhost:8080/day10/demo1就能够执行doGet()方法
在服务器下寻找day10项目下的xml文件
在xml下寻找/demo1
根据/demo1找到<servlet-name>
再次找相同名字的<servlet-name>
对应一个完整的类名
使用反射加载类名
案例: 使用servlet完成用户登录
登录页面
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Title</title>
</head>
<body>
<form action="Setvlet" method="post">
username:<input type="text" name="username" ><br>
password:<input type="password" name="password" ><br>
验证码:<input type="text" name="CheckCode"><img src="CheckCodeSetvlet" id="CheckCode">
<a id="CheckCode" >看不清,换一张</a>
<input type="submit" value=" login ">
</form>
</body>
</html>
调用servlet
@WebServlet(name = "Servlet",urlPatterns = "/Setvlet")
public class Servlet extends HttpServlet {
@Override
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
String username = request.getParameter("username");
String password = request.getParameter("password");
User user = new User();
user.setUsername(username);
user.setPassword(password);
UserService userService = new UserServiceImpl();
User user1 = userService.login(user);
response.setContentType("text/html;charset=utf-8");
ServletContext sc = this.getServletContext();
if(user!=null){
int num = 0;
if(sc.getAttribute("num")!=null){
num = (int)sc.getAttribute("num");
}
sc.setAttribute("num", ++num);
PrintWriter out = response.getWriter();
num = (int)sc.getAttribute("num");
out.print("<h1>第"+num+"位登录成功的用户</h1>");
}else{
response.sendRedirect("login.html");
}
}
@Override
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
this.doGet(request, response);
}
}
调用service层
public class UserServiceImpl implements UserService {
@Override
public User login(User user) {
UserDao userDao = new UserDaoimpl();
User user1 = userDao.login(user);
return user1;
}
调用dao层
public class UserDaoimpl implements UserDao {
@Override
public User login(User user) {
QueryRunner qr = new QueryRunner(C3P0Utils.getDataSource());
String sql = "select * from user where username = ? and password = ?";
User user1 = null;
try {
user1 = qr.query(sql, new BeanHandler<>(User.class),new Object[]{user.getPassword(),user.getPassword()});
} catch (SQLException e) {
e.printStackTrace();
}
return user1;
}
}
bean层
public class User {
private int id;
private String username;
private String password;
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public String getUsername() {
return username;
}
public void setUsername(String username) {
this.username = username;
}
public String getPassword() {
return password;
}
public void setPassword(String password) {
this.password = password;
}
public int getAge() {
return age;
}
public void setAge(int age) {
this.age = age;
}
private int age;
}
utils层 C3P0连接池
import java.sql.Connection;
import javax.sql.DataSource;
import com.mchange.v2.c3p0.ComboPooledDataSource;
public class C3P0Utils {
private static DataSource ds;
static{
ds = new ComboPooledDataSource();
}
public static DataSource getDataSource(){
return ds;
}
public static Connection getConnection(){
Connection conn = null;
try{
conn = ds.getConnection();
}catch(Exception e){
e.printStackTrace();
}
return conn;
}
}
c3p0-config.xml默认配置
<property name="driverClass">com.mysql.jdbc.Driver</property>
<property name="jdbcUrl">jdbc:mysql:///0826</property>
<property name="user">root</property>
<property name="password">123</property>
案例登录流程分析
