A brief introduction to the differences between get and post in the request object in Java (picture)

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•1.get The difference from post

•1.1 Code in get methodjspform form code

•1.2 actionThe code in the doGet method of servlet in the package

•2. Running results

•2.1 Input data

•2.2 Print out data

•3. post method

•4. Comparison

•4.1 Press F12 on the output page View

##•5.Analysis

##1.The difference between get and postGet and Post methods are both request methods to the server, but they transmit the form in different ways.

Let’s take the example of transmitting data of a form to analyze the difference between get and post

1.1 get method code in jsp form form code

1.2 The code in the doGet method of the servlet in the action package

protected void doGet(HttpServletRequest request, HttpServletResponse response)
   throws ServletException, IOException {
  response.setContentType("text/html;charset=gbk");//设置响应正文的mime类型
  request.setCharacterEncoding("gbk");//设置请求的编码格式
  response.setCharacterEncoding("gbk"); 

  String username = request.getParameter("userName");//
  String password = request.getParameter("password");
  String sex = request.getParameter("sex");
  String classes = request.getParameter("class");
  String hobby[] = request.getParameterValues("hobby");// 获取checkbox的数据保存到hobby数组中

  PrintWriter out = response.getWriter();
  
  if (hobby != null) {
   for (String x: hobby) {
    out.println("doGet被调用");
    out.println("name:"+username+"password:"+password+"sex"+sex+"classes"+classes);
    out.println("hobby:" + x);  
   }
  }else{
   out.println("此人没爱好！"); 
  }
 }

Note: The name of the servlet in the action package is the same as the name of the form action:

2. Running results 2.1 Input data

2.2 Print out the data

3.post method You only need to change the method in the table form to post:

There is such a line of code in the servlet:

can also be printed out: only garbled characters appear

4. Comparison 4.1 Press F12 on the output page to view

The difference between post and get, post

is preferred

Disadvantages of post:

Updating the

web version can avoid errorsservlet Code analysis

5. Analysisservlet as a

controller

is not If the content should be output, we should put the content to be printed in the jsp file

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