📄 getpost.java
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//GetPost.java
package chapter10;
import java.io.*;
import javax.servlet.*;
import javax.servlet.http.*;
public class GetPost extends HttpServlet{
public void init(ServletConfig config) throws ServletException{
super.init(config);
}
public void doPost(HttpServletRequest request,HttpServletResponse response)throws ServletException,IOException{
PrintWriter out=response.getWriter();
response.setContentType("text/html;charset=gb2312");
out.println("<html>");
out.println("<head>");
out.println("<title>Post</title>");
out.println("<body>");
out.println("<center>");
String numStr=request.getParameter("number");
try{
int num=Integer.parseInt(numStr);
if(num>0){
out.println("<h1>"+num+"的所有因数有：</h1><br>");
for(int i=1;i<=(num/2);i++){
if((num%i)==0)
out.println(i+" ");
}
out.println(num+"<br>");
}
else{
out.println("<h1>您输入的数字有误！请确认是正整数</h1>");
}
}
catch(NumberFormatException e){
out.println("<h1>您输入的数字有误！请确认是正整数</h1>");
}
out.println("</center>");
out.println("</body>");
out.println("</html>");
}
public void doGet(HttpServletRequest request,HttpServletResponse response)throws ServletException,IOException{
PrintWriter out=response.getWriter();
response.setContentType("text/html;charset=gb2312");
out.println("<html>");
out.println("<head>");
out.println("<title>Post</title>");
out.println("<body>");
out.println("<center>");
String numStr=request.getParameter("number");
try{
int num=Integer.parseInt(numStr);
if(num==1){
out.println("<h1>没有不大于1的质数有！</h1><br>");
}
else if(num>1){
out.println("<h1>不大于"+num+"的所有质数有：</h1><br>");
int i,j;
for(i=2;i<=num;i++){
for(j=2;j<i;j++){
if((i%j)==0){
break;
}
}
if(j==i){
out.println(i+" ");
}
}
out.println("<br>");
}
else{
out.println("<h1>您输入的数字有误！请确认是正整数</h1>");
}
}
catch(NumberFormatException e){
out.println("<h1>您输入的数字有误！请确认是正整数</h1>");
}
out.println("</center>");
out.println("</body>");
out.println("</html>");
}
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