通过servlet计算三角形的周长和面积

1.input.jsp 输入三角形三条边长

三角形边长a：
三角形边长b：
三角形边长c：

2.servletPackage中的verify.java package servletPackage;

import java.io.IOException;
import java.io.PrintWriter;

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

public class verify extends HttpServlet {

/**
 * Constructor of the object.
 */
public verify() {
	super();
}

/**
 * Destruction of the servlet. <br>
 */
public void destroy() {
	super.destroy(); // Just puts "destroy" string in log
	// Put your code here
}

/**
 * The doGet method of the servlet. <br>
 *
 * This method is called when a form has its tag value method equals to get.
 * 
 * @param request the request send by the client to the server
 * @param response the response send by the server to the client
 * @throws ServletException if an error occurred
 * @throws IOException if an error occurred
 */
public void doGet(HttpServletRequest request, HttpServletResponse response)
		throws ServletException, IOException {
	doPost(request,response);
}

/**
 * The doPost method of the servlet. <br>
 *
 * This method is called when a form has its tag value method equals to post.
 * 
 * @param request the request send by the client to the server
 * @param response the response send by the server to the client
 * @throws ServletException if an error occurred
 * @throws IOException if an error occurred
 */
public void doPost(HttpServletRequest request, HttpServletResponse response)
		throws ServletException, IOException {
	String aa=request.getParameter("aa"); 
	String bb=request.getParameter("bb"); 
	String cc=request.getParameter("cc"); 
    try{    
    	int n=Integer.parseInt(aa);
    	int m=Integer.parseInt(bb);
    	int s=Integer.parseInt(cc);
    	if(n+m>s&&n+s>m&&m+s>n){
    		RequestDispatcher dispatcher= request.getRequestDispatcher("result");
    		dispatcher.forward(request,response); //需要传参数，转发到另一个servlet文件
    	}
    	else{
    		response.sendRedirect("input.jsp"); 
    	}
    }
    catch(NumberFormatException e){
    	response.sendRedirect("input.jsp"); 
    }
} 

/**
 * Initialization of the servlet. <br>
 *
 * @throws ServletException if an error occurs
 */
public void init() throws ServletException {
	// Put your code here
}

}
3.servletPackage中的result.java
package servletPackage;

import java.io.IOException;
import java.io.PrintWriter;

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

public class result extends HttpServlet {

/**
 * Constructor of the object.
 */
public result() {
	super();
}

/**
 * Destruction of the servlet. <br>
 */
public void destroy() {
	super.destroy(); // Just puts "destroy" string in log
	// Put your code here
}

/**
 * The doGet method of the servlet. <br>
 *
 * This method is called when a form has its tag value method equals to get.
 * 
 * @param request the request send by the client to the server
 * @param response the response send by the server to the client
 * @throws ServletException if an error occurred
 * @throws IOException if an error occurred
 */
public void doGet(HttpServletRequest request, HttpServletResponse response)
		throws ServletException, IOException {
	doPost(request,response);
}

/**
 * The doPost method of the servlet. <br>
 *
 * This method is called when a form has its tag value method equals to post.
 * 
 * @param request the request send by the client to the server
 * @param response the response send by the server to the client
 * @throws ServletException if an error occurred
 * @throws IOException if an error occurred
 */
public void doPost(HttpServletRequest request, HttpServletResponse response)
		throws ServletException, IOException {
	response.setContentType("text/html;charset=UTF-8");
    PrintWriter out=response.getWriter();
    String number1=request.getParameter("aa"); 
    String number2=request.getParameter("bb");
    String number3=request.getParameter("cc");//获取客户提交的信息
    int n=Integer.parseInt(number1);
    int m=Integer.parseInt(number2);
    int s=Integer.parseInt(number3);
    int p=(m+n+s)/2;
    
    out.println("三角形的面积为:"+Math.sqrt(p*(p-s)*(p-n)*(p-m)));
    out.println("三角形的周长为:"+2*p);
}

/**
 * Initialization of the servlet. <br>
 *
 * @throws ServletException if an error occurs
 */
public void init() throws ServletException {
	// Put your code here
}

}