- 创建JavaWeb项目
- 打开Eclipse
- 点击菜单栏“File”->“New”->“Dynamic Web Project”
- 输入项目名称，然后点击“Next”按钮
- 选择“Generate web.xml deployment descriptor”，然后点击“Finish”按钮
- 添加Servlet
- 在“Package Explorer”视图中右键点击项目名称，选择“New”->“Servlet”
- 添加Servlet的类名和包名，然后点击“Next”按钮
- 选择要继承的父类，然后点击“Finish”按钮
- 配置Servlet
- 在Servlet类中重写doGet()和doPost()方法
- 在web.xml中添加Servlet类的映射
示例一：Hello World
@WebServlet(name = "HelloServlet", urlPatterns = "/hello")
public class HelloServlet extends HttpServlet {
private static final long serialVersionUID = 1L;
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
response.setContentType("text/html;charset=utf-8");
PrintWriter writer = response.getWriter();
writer.println("<html>");
writer.println("<head><title>Hello Servlet</title></head>");
writer.println("<body>");
writer.println("<h1>Hello World!</h1>");
writer.println("</body>");
writer.println("</html>");
writer.close();
}
protected void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
doGet(request, response);
}
}
在浏览器中输入"http://localhost:8080/<项目名>/hello"，即可看到"Hello World!"字样的显示页面。
示例二：计算器
@WebServlet(name = "CalServlet", urlPatterns = "/cal")
public class CalServlet extends HttpServlet {
private static final long serialVersionUID = 1L;
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
response.setContentType("text/html;charset=utf-8");
PrintWriter writer = response.getWriter();
writer.println("<html>");
writer.println("<head><title>Calculator</title></head>");
writer.println("<body>");
int num1=Integer.parseInt(request.getParameter("num1"));
int num2=Integer.parseInt(request.getParameter("num2"));
int res=0;
String op=request.getParameter("op");
switch(op){
case "+":res=num1+num2;break;
case "-":res=num1-num2;break;
case "*":res=num1*num2;break;
case "/":res=num1/num2;break;
}
writer.println("<h1>"+num1+op+num2+"="+res+"</h1>");
writer.println("</body>");
writer.println("</html>");
writer.close();
}
protected void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
doGet(request, response);
}
}
在浏览器中输入"http://localhost:8080/<项目名>/cal?num1=2&num2=3&op=+"，即可看到"2+3=5"字样的显示页面。
以上就是JavaWeb入门教程的完整攻略及示例说明。
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