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Servlet应用查询增加业务

2017-11-30 21:38 162 查看

WEB-INF下面修改系统生成的web.xml文件根目录中添加如下代码：

<servlet>
<servlet-name>emp</servlet-name>
<servlet-class>web.EmpServlet</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>emp</servlet-name>
<url-pattern>*.emp</url-pattern>
</servlet-mapping>
在webapp下建一个表单请求文件：
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>增加员工</title>
</head>
<body>

<form action="add.emp" method="post">
<p>
姓名：<input type="text" name='ename'/>
</p>
<p>
职位：<input type="text" name='job'/>
</p>
<p>
工资：<input type="text" name='sal'/>
</p>
<p>
<input type="submit" value="保存"/>
</p>
</form>
</body>
</html>
JavaBean序列化类：
package entity;

import java.io.Serializable;

public class Emp implements Serializable{
private Integer Empno;
private String Ename;
private String Job;
private Double Sal;
public Integer getEmpno() {
return Empno;
}
public void setEmpno(Integer empno) {
Empno = empno;
}
public String getEname() {
return Ename;
}
public void setEname(String ename) {
Ename = ename;
}
public String getJob() {
return Job;
}
public void setJob(String job) {
Job = job;
}
public Double getSal() {
return Sal;
}
public void setSal(Double sal) {
Sal = sal;
}

public String toString() {
return "Emp [Empno=" + Empno + ", Ename=" + Ename + ", Job=" + Job + ", Sal=" + Sal + "]";
}

}
Emp集合类：
package dao;

import java.io.Serializable;
import java.util.ArrayList;
import java.util.List;

import entity.Emp;

public class EmpDao implements Serializable {
public List<Emp> findAll(){
List<Emp> list = new ArrayList<Emp>();
Emp e1 = new Emp();
e1.setEmpno(1);
e1.setEname("linsa");
e1.setJob("java");
e1.setSal(5000.0);
list.add(e1);

Emp e2 = new Emp();
e2.setEmpno(2);
e2.setEname("rose");
e2.setJob("python");
e2.setSal(4000.0);
list.add(e2);

Emp e3 = new Emp();
e3.setEmpno(3);
e3.setEname("jack");
e3.setJob("c++");
e3.setSal(8000.0);
list.add(e3);
return list;
}

public void save(Emp e) {
System.out.println("Emp已保存");
}
}
处理浏览器响应类：
package web;

import java.io.IOException;
import java.io.PrintWriter;
import java.util.List;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
abfc

import dao.EmpDao;
import entity.Emp;

public class EmpServlet extends HttpServlet {
/**
* 该类处理员工模块的请求(*.emp)
*
* 开发规范：
* 查询员工： /find.emp
* 增加员工： /add.emp
*/
protected void service(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
//根据路径处理不同的请求
String p = req.getServletPath();
if("/find.emp".equals(p)) {
findEmp(req,resp);
}else if("/add.emp".equals(p)) {
addEmp(req,resp);
}else {
throw new RuntimeException("没有这个页面");
}

}
protected void findEmp(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
//查询所有的员工
EmpDao dao = new EmpDao();
List<Emp> list = dao.findAll();
//发送响应数据
resp.setContentType("text/html;charset=utf-8");
PrintWriter w = resp.getWriter();
//当前：/EmpManager/findEmp
//目标：/EmpManager/add_emp.html
w.println("<a href='add_emp.html'>增加</a>");
w.println("<table border='1' cellspacing='0' width='30%'>");
w.println(" <tr>");
w.println(" <td>编号</td>");
w.println(" <td>姓名</td>");
w.println(" <td>职位</td>");
w.println(" <td>工资</td>");
w.println(" </tr>");
for(Emp e : list) {
w.println(" <tr>");
w.println(" <td>"+e.getEmpno()+"</td>");
w.println(" <td>"+e.getEname()+"</td>");
w.println(" <td>"+e.getJob()+"</td>");
w.println(" <td>"+e.getSal()+"</td>");
w.println(" </tr>");
}
w.println("</table>");
w.close();
}
protected void addEmp(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
//接收数据
req.setCharacterEncoding("utf-8");
String ename = req.getParameter("ename");
String job = req.getParameter("job");
String sal = req.getParameter("sal");
//保存这些数据
Emp e = new Emp();
e.setEname(ename);
e.setJob(job);
if(sal != null && !sal.equals("")) {
e.setSal(new Double(sal));
}
new EmpDao().save(e);
//发送响应
/*resp.setContentType("text/html;charset=utf-8");
PrintWriter w = resp.getWriter();
w.println("<p>保存成功</p>");
w.close();*/
//重定向到查询页面
//当前：/EmpManager/add.emp
//目标：/EmpManager/find.emp
resp.sendRedirect("find.emp");
}

}

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